Questions Asked on
February 23, 2010

  1. Chemistry

    A dilute sulfuric acid solution that is 3.39 m H2SO4 has a density of 1.18 g/mL. How many moles of H2SO4 are there in 375 mL of this solution? 3.39 is 3.39 Molality not molarity

    asked by Nick
  2. Algebra 2

    Find the LCD of 5/18x^2y^3,-3/24x^4y^5

    asked by Gina
  3. history

    The Progressive Movement has been characterized as a movement that brought a sense of justice and morality to the American political scene between 1890 and 1917. Other historians say that although well-intentioned, in the end they failed to achieve their

    asked by smeffy
  4. chemistry

    Liquid quinoline reacts according to the balanced equation. When 1200 g of C9H7N is reacted, calculate the sign and magnitude (kJ) of the heat produced. 4 C9H7N(l) + 43 O2(g) → 2 N2(g) + 36 CO2(g) + 14 H2O(l) .

    asked by eng
  5. spanish

    how do you write 25,000 and 432 in spanish?

    asked by Anonymous
  6. Precalculus

    Ok u have to put X^3-8 divided over X^2(X-1)^3 Into a partial fraction I need help please

    asked by Sinya
  7. Chemistry

    Do you need to do uncertainties on percent error? It doesn't make sense to have "percent error on percent error".

    asked by Stuck
  8. chemistry

    2. Bromine can be added to limonene to create a brominated compound. The balanced equation is shown below. When 613 mg of limonene and 3.5 mL of a 10% (v/v) solution of Br2 in dichloromethane (a solvent) are combined, 959 mg of the product is isolated.

    asked by Grace
  9. english

    We met at Nick's house before going out to eat. Proper Noun=Nick's Common noun=house Byron Elementay School has a day off tomorrow. Proper noun= Bryon Elementary School Common noun=tomorrow They studied the pictures of Venus. Proper Noun=Venus Common

    asked by Christopher
  10. Honors Chemistry

    I don't exactly understand this question -- can someone maybe explain it to me please? 6) Suppose you have an NaOH solution of unknown concentration. Name three possible substances that could be used in "known" solutions to titrate the NaOH solutions.

    asked by Emily
  11. maths

    what is a plutonis solid?

    asked by Anonymous
  12. science

    whats a descriptive observation

    asked by Anonymous
  13. physics

    why helium gas absorb heat?

    asked by karthika
  14. Precalculus

    Find dy/dx if y= (6x sqrt(x^3) (-2(cubic root of x+ pie^4).

    asked by Matt
  15. physics

    in low temperature physics,at joule thomson effect hydrogen does not show cooling effect at room temperature why?

    asked by karthika
  16. physics

    in joule thomson effect,why the temperature of inversion leads to negative sign?

    asked by karthika
  17. Chemistry

    which has the highest lattice energy BaO or SrO

    asked by Jack
  18. Social Studys

    Fill in the blank. 1. In 1791 congress passed a tax on American-made _________________ as part of a plan to help pay the federal debt.

    asked by Sarah
  19. Chemisrty

    Calculate the theoretical amount of CaCl2 that would be required to change the temperature of 50 mL of water from from temperature 20 degrees Celsius to 45 degrees Celsius. Remember that the heat lost during the dissociation is equal to the heat gained by

    asked by sakura_09
  20. Social Studys

    Fill in the blank The ______________________ stated that the U.S. would not take sides with any European countries at war with one another.

    asked by Sarah
  21. Chemistry

    calculate the final temperature (once the ice has melted) of a mixture made up of initially of 75.0mL liquid water at 29 degrees Celsius and 7.0 g of ice at 0.0 degrees Celsius

    asked by Celine
  22. chemistry

    see if on tlc silica if the polar solvent moves slowly then does even polar substances rf value is low? and the nonpolar rf is high?

    asked by KKSAI
  23. physics

    Assume the height of a hill is 50m, calculate: a.the velocity of a car at the bottom ofg the hill b.the height at which it will have half the speed. Assume the car starts from rest at the top of the hill.

    asked by bola
  24. Physics Electric POtential

    An electric charge q creates a field of 4500 N/C at a point d away from the charge. The potential at that point is +1800V. Determine q and d. Do you have to use the formula E=kQ/r^2 or something else? I'm lost on how to solve it

    asked by Hailey
  25. physics

    When brakes applied to a moving car travelling at 60km/hr it decelerates at a uniform rate of 5ms-2. Calculate the time taken to reach a velocity of 36km/hr

    asked by bola
  26. Business

    Should illegal drugs be illegalized in the United States?

    asked by Lynne
  27. government

    Please can you help me to find out which courtroom in Wellington has panelling from the Old Bailey. I am thinking the High Court.

    asked by Sam
  28. business

    should recreational drugs be legalized in the united staates?

    asked by Lynne
  29. Physics

    Hi guys, i get stuck with this question. Pls help. thanks so much. I know there are 4 atoms in FCC. A gold particle was measured to be spherical in shape with a radius of 400 nm. Note that assuming the gold atoms are small spheres that form the gold

    asked by kat
  30. science

    Hi guys, i get stuck with this question. Pls help. thanks so much. I know there are 4 atoms in FCC. A gold particle was measured to be spherical in shape with a radius of 400 nm. Note that assuming the gold atoms are small spheres that form the gold

    asked by kat
  31. chemistry

    Hi guys, i get stuck with this question. Pls help. thanks so much. I know there are 4 atoms in FCC. A gold particle was measured to be spherical in shape with a radius of 400 nm. Note that assuming the gold atoms are small spheres that form the gold

    asked by kat
  32. CHEMISTRY

    How many moles of methanoic acid you have in a 25g sample of ethanoic acid

    asked by JAY
  33. algebra 1

    PLEASE HELP SOLVE.... 8+2>4(2))+1

    asked by Lori
  34. History

    Can you answers the Q's about a Notable American Explorer ? I need to know all about Sir Francis Drake Can you please tell me : The reason why he became an explorer Country he sailed for (if different from their country of origin please explain why) where

    asked by AvatarSandS
  35. geometry

    Determine wether triangle deef is cogruent to triangle pqr given the coordinates of the verticles. D(-6,1),E(-1,-4),P(0,5),Q(7,6),R(5,0)

    asked by Trey
  36. economics

    For each of the following possible events, indicate whether the demand or supply curve for dollars would shift, the direction of the shift, the determinant of the change, the inflow or outflow effect on the balance of payments (and the specific account

    asked by Babi
  37. Economics

    For each of the following possible events, indicate whether the demand or supply curve for dollars would shift, the direction of the shift, the determinant of the change, the inflow or outflow effect on the balance of payments (and the specific account

    asked by Babi
  38. SCIENCE

    Could someone give me some advice on how to tackle this question please? Explain briefly why the changes in albedo and the other factors give rise to the changes in the GMST, relating your explanation to the water cycle. Is this an example of positive or

    asked by Dawn
  39. chemistry

    A dilute sulfuric acid solution that is 3.39 molality H2SO4 has a density of 1.18 g/mL. How many moles of H2SO4 are there in 375 mL of this solution?

    asked by Nick
  40. Algebra

    I know when solving inequalities the sign changes when you multiply or divide by a negative number, my question is does this happen in equations as well?

    asked by Michelle
  41. geometry

    How do you construct a quadrilateral with two pairs of parallel sides of length 4 cm and 6 cm and one pair of opposite angles each measuring 123 degrees

    asked by MIcky
  42. math

    -4b-8=8

    asked by michelle
  43. English

    Can you tell me which of the following statements are correct? Thank you very much. 1) For my main course I'd like grilled chicken breast (and not a grilled chickne breast) with boiled potatoes and peas. 2)For my starter I'll have a soup of the day and for

    asked by Franco
  44. physics

    A single conservative force acts on a 5.00 kg particle. The equation Fx = (2x + 4) N describes this force, where x is in meters. As the particle moves along the x axis from x = 1.40 m to x = 7.00 m, calculate the following.

    asked by gina
  45. geometry

    What is the length of the hypotenuse of the right angle ABC if AB = 5 and AC = 6

    asked by Carol
  46. pre algabra

    -4(-3x+5y+5)+7(5x+2y-1)

    asked by melissa
  47. English

    I forgot to include the following statements. 1) Answer four out of (or just "of") the following six questions. 2) do you usually use do with the following sports activities: aerobics, athletics, karate, ballet 3) go + cycling, water rafting, paragling (?

    asked by Franco
  48. 2nd grade

    how do I count the vertices of a rectangle

    asked by kim
  49. managerial finance

    Early in 2007, Inez Marcus, the chief financial officer for Suarez Manufacturing, ws given the task of assessing the impact of a proposed risky investment on the firm's stock value. To perform the necessary analysis, Inez gathered the following information

    asked by jeffer
  50. college algebra

    By setting up and solving a proportion involving x, find the value of x for the car that you have chosen. State the type of car, the mileage, and show both the set up of the proportion and the steps to solve. Include units with your answer. How would I do

    asked by Stephanie
  51. College Accounting

    The following questions contain numbers and you have to do different things with the number in each question. I'm not sure of the steps to take to figure out each answer. And, when I try to do what the book shows me I come up with wrong answers. So if you

    asked by Abbyy
  52. fraction writing to explain

    a park has 4 hiking trails. trails A and B go from the lodge to the dock. trail A is 1/2 mile long, and trail B is 2/3 mile long. trails C and D go from the dock to the park entrance. Trail C is 1/4 mile long, and trail D is 1/3 mile long. Draw a picture

    asked by Nathan
  53. science

    okay i have a question which is on a key assesed piece explain the physical and chemical changes when a candle burns using the big idea of energy? what is the big idea of energy?

    asked by minka
  54. math

    find the equation (in slope intercept form) of the line with the given slope that passes through the point with the given coordinates slope:-5/8, ordered pair (0,1)

    asked by jerson
  55. Economics

    what does the positive slope of a line with Government expenditure (G) represent when Y=Total expenditure is on the x axis. For simplification, in the equation G=a+tY, where a and t are constants, what does t represent?

    asked by Salman
  56. Biology

    37. Hyphae a. increase the surface area-to-volume ratio of the fungus b. have slender filaments c. allow for efficient uptake of nutrients d. all of the above D? 38. In which process do tRNA molecules attach amino acids to the growing chain according to

    asked by mysterychicken
  57. statistics

    College students average 7.8 hours of sleep per night with a standard deviation of 45 minutes. If the amount of sleep is normally distributed, what proportion of college students sleep for more than 9 hours?

    asked by Anonymous
  58. Algebra

    If you replace the equal sign of an equation with an inequality sign, is there ever a time when the same value will be a solution to both the equation and the inequality?

    asked by Michelle
  59. chemistry

    type of chemical reaction equation H3PO4+KOH=K3PO4+H2O

    asked by norma
  60. math

    write each number as a power of 2 1.1/8 2.square root of 2 3.3 to the square root of 4 3(4 how do you do it???

    asked by alyssa.
  61. Management Accounting

    The Minnetonka Corporation, which produces and sells to wholesalers a highly successful line of water skis, has decided to diversify to stabilize sales throughout the year. The company is considering the production of cross-country skis. After considerable

    asked by Anonymous
  62. math

    what's 7 x 3

    asked by mrDumb
  63. Physics

    A commercial resistor can safely dissipate power only up to a certain rated value. Beyond this value, the resistor becomes excessively hot and often cracks apart. The resistor used in this experiment was rated by the manufacturer to be a 2 watt resistor.

    asked by San
  64. Physics

    The nominal resistance R of the resistor used in this experiment was printed on the resistor by the manufacturer. According to the manufacturer, the actual resistance of the resistor should not differ from its nominal value by more than 1%. Does your most

    asked by Joseph
  65. Math 116 algebra

    Imagine you want to add a sprinkler system and the location of one section of the sprinkler line can be described by the equation y=-1/2x-4 Complete the table for this equation. x y (x,y) -1 -2 -4 2 8

    asked by Karine
  66. Physics

    The typical resistance of the tungsten filament of a 60 watt incandescent light bulb when it is turned off is 24 ohms and its resistance when operating from a 120 volt power source is 240 ohms. Generally, an incandescent light bulb filament is most likely

    asked by Joseph
  67. Physics

    Mercury is poured into the open end of a J-shaped glass tube, which is closed at the short end, trapping air in that end. How much mercury can be poured in before the mercury overflows? Assume air to act like an ideal gas. The long and short arms are 1 m

    asked by Isabel
  68. chemistry

    type of chemical reaction synthesis, decomposition, double or single K+B2O3=K2O+B

    asked by norma
  69. p.e

    how to jump rope

    asked by bigears
  70. math

    1+1

    asked by katie
  71. math

    Select all that justify the following statement.3 + (y + 5) = y + 8

    asked by Anonymous
  72. Environmental Science

    #33. In two or three well-developed paragraphs, explain how water is treated so that it can be used for safe drinking water. Include definitions of the terms potable and pathogens. my answer: There are many steps to how water is treated so that it can be

    asked by y912f
  73. chemistry

    Diacetyl, a substance contributing to the characteristic flavor and aroma of butter, consists of 55.8% C, 7.03% H, and 37.17% O. In the gaseous state at 100 degrees celsius and 747 torr, a 0.30 gram sample occupies a volume of 111 ml. What is the molecular

    asked by Bob
  74. chemistry

    the heat of fusion for thallium is 21 J/g, and its heat of vaporization is 795 J/g. Thallium's melting point is 304 degrees celsius, and its boiling point is 1457 degrees celsius. The specific heat of liquid thallium is 0.13 J/g degrees celsius. How much

    asked by billy
  75. Environmental Science

    #34. In two or three well-developed paragraphs, name and describe the five primary air pollutants and provide several sources of each. my answer: There are five primary air pollutants and some sources of each of them. The first pollutant is Carbon monoxide

    asked by y912f
  76. physics

    An eardrum can burst when the pressure exceeds one atmosphere and the pressure inside the ear fails to equalize. Determine the depth in seawater when this pressure would be reached. (pressure of ocean = 1.03*10^3 kg/m^3)

    asked by Alex
  77. calculus

    xy+y^2=1 find d^2/dx^2 at (0,1)

    asked by vic
  78. chemistry II

    to what temperature (C) would a solution containing C6H12O6 in 200g of water have to be heated to have a vp of 89.5 mmHg?

    asked by heather
  79. 10th grade

    The volume of a small sphere is 36 pie cm cubed. The volume of a large sphere is 288 cm cubed and its radius is 6 cm. What is the similarity ratio of the radii of the two spheres? What is the measurement of the small sphere's radius?

    asked by renee
  80. Business Ethics

    Why does N. Scott Arnold think that even voluntary preferential treatment programs are wrong?

    asked by Charlene
  81. math214

    If possible, describe a geometric figure that can be transformed into itself by each of the following: Reflection, Rotation, Translation, Glide Reflection

    asked by alicia
  82. math214

    Describe objects that have each of the following types of symmetry. Line, Point, Plane, 90° rotational

    asked by alicia
  83. Algebra1

    Hello, need help with this question: Find the product. (-7m2n)(-9mn3) For my answer i put 63m^3n^4 and I got it wrong, the computer online doesn't recongnize the carrot and we were told for the carrot you have to replace it and now I am lost.

    asked by Denise
  84. algebra

    Need help showing me the steps without using the carrot function: Find the product. (2y + 2z)(2y - 3z)

    asked by colin
  85. Health

    You wake up one morning with a headache, body aches, and a fever. You think you might be coming down with something. Analyze the relationship between healthful behaviours you can practice and the ways that communicable diseases are spread. What should you

    asked by April
  86. bio

    how do you think the development of vaccines for more than 20 communicable diseases has affected the average human life span in areas where these vaccines are available?

    asked by melita
  87. Chem 2

    Imagine that a deposit of helium gas has been discovered in Antarctica. It is being shipped to Australia in a rigid (constant volume) tank with a rated max pressure of 100 atm. If the tanks are filled to a pressure of 75 atm in Antarctica on a day when the

    asked by Staci
  88. english

    would you say pittance or meagre is the best word to use.

    asked by Janey
  89. chemistry

    which is the only noble gas listed that is stable at 0 degrees celsius?

    asked by ryan
  90. science

    Can poor nutrition early in life be mitigated to allow for healthy physical growth and development later

    asked by tonya
  91. geography

    what is china's culture? please give examplesa Thank you!

    asked by ben
  92. math (please check my work)

    find the equation (in slope intercept form) the line passing through the points with the given coordinate (-1,-1) (-3,-3) -3-(-1)/-3-(-1)=2 y+3=2(x-(-3) y+3=2x-6 -3 -3 y=2x-9 is what i got is this correct?

    asked by jerson
  93. literacy

    From the book (The Van Gogh cafe) by Cynthia Rylant: Why is Clara afraid to mention the pies to her father?

    asked by Anonymous
  94. Physics

    A child goes down a playground slide with an acceleration of 1.24 m/s^2. Find the coefficient of kinetic friction between the child and the slide if the slide is inclined at an angle of 32.0 degrees below the horizontal.

    asked by Abby
  95. social studies

    provision fom the virgina plan

    asked by Anonymous
  96. bobpursley: math cont

    find the equation (in slope intercept form) the line passing through the points with the given coordinate (-1,-1) (-3,-3) ok slope 1 y+3=1(x-(-3) y+3=1x-3 -3 -3 y=x-6.. correct?

    asked by jerson
  97. calculus

    consider the function f(x) = e^x(sinNx) on the interval [0,1] where N is a positive integer. a) Compute the integral from 0 to 1 of f(x). Evaluate this integral when N=5, N=10, and N=100. B) What happens to the graph and to the value of the integral as

    asked by Lindsay
  98. College Physics

    a 1200kg car coasts from rest down a driveway that is inclined 20degrees. to the horizontal and is 15m long. how fast is the car going at the end of the delivery if.... (a) friction is negligible (book answer is 10m/s) (b) a friction force of 3000n opposes

    asked by eddy
  99. gr.12 chem

    what is The relationship between the number of carbon atoms and the boiling points of the alkanes?

    asked by shelly
  100. 5th grade

    can you explain to me how to add and subtract fractions like 2/5 + 5/12 or 7/12 - 8/9? i'm having trouble on this and i'm always forgetting how to do it.

    asked by brianna
  101. spanish

    ¿Va a viajar a Perú tu primo Andrés?

    asked by Anonymous
  102. psychology

    i need to find a website that i can down load a copy of an adult psychologial treatment form...where can i find one????

    asked by barb
  103. works cited

    I read Sparknotes No Fear Shakespeare Hamlet...how do I cite the source? Crowther, John. Ed. “No Fear Hamlet.” SparkNotes LLC? I don't know what to put on my works cited page.

    asked by Anonymous
  104. writing about technology

    Can anyone give me a website where I can find facts about the GPS or the compass???????????? PLEASE!!!!

    asked by sierra (6th grade)
  105. Chemistry

    Calculate the initial molarity of KNH2 and the molarities of K+, NH3, OH-, and H3O+ in an aqueous solution that contains 0.75 g of KNH2 in 0.255 L of solution. You may ignore the reaction of NH3 with water. I already found the initial molarity, but I am

    asked by Trixie
  106. biology

    1) RNA condons and amino acids: valine, proline, alanine a. GCGCGUGUG b. GUGCCUGCG c. GUUCCCACU d. GCUCUUGCU

    asked by Toni
  107. physics

    3) A 5.0 kg book is sitting on a table. Which describes the force acting on the book a. there are no forces acting on the book b. the force of the table upward is greater than the force of gravity downward c. the net force on the book is zero d. kinetic

    asked by amber
  108. general biology

    Whcih property of water explains ice floating on the top of a pond rather than sinking to the bottom? a. surface tension b. freezing point at 0 celcius c. capillary action d. extensive hydrogen bonding

    asked by Edwina
  109. nutrition

    Pregnancy obviously results in an increased need for vitamins and minerals. Deficiency or excess of any of a number of nutrients can lead to birth defects and/or complications during pregnancy

    asked by nancy
  110. physics

    Hans uses a wheelchair. Although he has a rampto in his house, he finds it difficult to get his wheelchair up the ramp. Whcih modification would make it easier for Hans to get in his house? a. increase the length of the ramp b. increase the friction

    asked by Leah
  111. Chemistry

    In order to raise the temperature of 5.0 Kg of water from 20 degrees C to 30 degrees C,m a 2.0 Kg iron bar is heated and then dropped into the water. what should the starting temperature of the bar be? (specific heat of Fe = 0.11 cal/g-deg.)

    asked by Mary
  112. Chemistry

    How much energy is needed to melt a 30.5 g ice cube?

    asked by Christopher
  113. physics

    2 waves are traveling through a container of nitrogen gas. Amplitude of the first wave is 0.3 cm, and the second 0.9 cm. What is true about the two waves? a. the energy of thee first wave is less than the second b. energy of the first wave is greater c.

    asked by Toni
  114. chemisty

    How much energy is needed to melt a 30.5 g ice cube?

    asked by Christopher
  115. physics

    What is responsible for earth's elliptical orbit around the sun? a. the gravitational pull of the sun b. magnetic forces both attracting and repelling other planetary bodies c. momentum caused by the earth's rotation d. balance between centripetal and

    asked by sadaf
  116. physics

    A runner training for a race times 400 meter laps. Lap 1 60sec, Lap 2 57sec, Lap 3 55sec, Lap 4 53sec. What is the average velocity in meters per second? a. 0.563 b. 7.1 c. 14.2 d. 56.25

    asked by sadaf
  117. Economics

    Why do some workers make more money than others? Must everyone make the same wage? Explain your answers using labor market equilibrium.

    asked by Nickki
  118. Chemistry

    If 0.870 mol of liquid Br2 and 720 mL of 0.958 M aqueous NaI are reacted stoichiometrically according to the balanced equation, how many grams of solid I2 are produced? 2NaI(aq) + Br2(l) → 2NaBr(aq) + I2(s) help please. :)

    asked by Keri
  119. Environmental Science

    #35. In two or three well-developed paragraphs, list the populations that are affected by ultriviolet light and identify the effects on each of these populations. my answer: There are four major populations that are affected by ultraviolet light. These

    asked by y912f
  120. gr. 12 chem

    what is none and decane used for and why is this appropriate for each use?

    asked by shelly
  121. Spanish

    Does anyone know how to say immiscible in spanish?

    asked by Maria
  122. cultury diversity

    The United States was founded by immigrants , so why is immigration such a controversial issue now?

    asked by moniquea
  123. Math

    Explain how four red marbles can make up 1/3 of a group of marbles and three blue marbles make up 1/4 of the same group.

    asked by Drew
  124. P. Chemistry

    A student added solid K2O to a 750.0 mL volumetric flask. The solid was dissolved in water and then the flask filled with water to the mark. This formed 750.0 mL of the initial KOH solution. 20.0 mL of the initial solution was transferred to another flask

    asked by Mark
  125. P. Chemistry

    If given the Ka or Kb and pKa and pKb, how do you find the initial concentration of a weak acid/base in a solution given the pH? Is there an equation for this? I can't find anything in my notes and am not sure what to look for.

    asked by Mark
  126. Math

    What is the measure of the dent angle for a star-shaped polygon with 20 points and a dent angle of 12 degrees?

    asked by Donna
  127. spainsh

    what does me gusta muy tu. tu hacer me algre mean in english

    asked by jon
  128. calculus

    suppose that the area under the curve y=1/x from x=a to x=b is k. the area in terms of k, under the curve y=1/x from x=2a to x=2b? justify

    asked by Anonymous
  129. Chemistry

    Ho much energy is needed to change a 50 g ice cube at 0 deg C to a liquid water at 100 deg. C?

    asked by Christopher
  130. Chemistry

    Determine the resulting temperature when 150 g of ice at 0 deg.C is mixed with 300 g of water at 50 deg C.

    asked by Stacie
  131. Math

    How to do: 4x+80=3x

    asked by J.R.
  132. writing

    I need more facts about the GPS and compass to use in my writing piece.

    asked by sierra (6th grade)
  133. algebra

    I need help with rewriting a relation so it is a function!!!!! for example { (1,3), (-8, 7), (2,3), (1, -6), (0,0), (5,3) } I am lost and need help quick

    asked by AR
  134. Chemistry

    How much heat is given up when 20 g of steam at 100 deg C is condensed and cooled to 20 deg.C?

    asked by Mary
  135. Social Studies

    Bernstein writes that today, "debates about immigration often included the claim that 'my relatives came the legal way,' Hom's daughter, Dorothy responded that "'one's status being legal or illegal, it's two seconds apart at any point" What does Dorothy

    asked by Laura
  136. sociology

    Western companies often impose western culture on the country in which the business is launched. Locate an article that contains a similar situation as Wal-Mart and summarize the findings. What is your analysis of the situation? How could this have been

    asked by sarah
  137. east nobel

    a certain gas has a volume of 565 mL at 25 0C and 715 mm Hg.how many moles of gas are there?

    asked by eva
  138. gr. 12 chem

    what is nonane and decane used for and why is this appropriate for each use?

    asked by shelly
  139. Chemistry

    why is it important to add the nitric acid-sulfuric acid mixture slowly over a 15 minute period?

    asked by Kendra
  140. math

    make an expression that equals -2 3/4 using 3 negative numbers

    asked by heather
  141. HCA240 Health

    Can someone explain what it means by health as organic and health as harmony???? If I can understand this I can get my homework done.

    asked by Debbie
  142. earth

    Could you tell a story of the rock cycle using a rock called Roger the Rock??

    asked by Mitch
  143. geography

    what are some tricks that will; help me remember the stats and the capitles

    asked by briana
  144. science

    was their any changes to the ocean since 10 million years ago?

    asked by james
  145. math

    A multiple choice answers for the question. What is the measure of the dent angle for a star-shaped polygon with 20 points and a dent angle of 12 degrees? Asnwers are; 30 degrees, 50 degrees, 60 degrees, 90 degrees. How do I find the answer?

    asked by Donna
  146. Chemistry

    What is the final temperature when 50.0 g of Chromium at 15 deg. C (specific heat of Cr = 0.107 cal/g-deg.) is added to 25 ml of 45 deg.C water?

    asked by Mary
  147. physics

    Two loudspeakers in a 20°C room emit 629 Hz sound waves along the x-axis. (a) If the speakers are in phase, what is the smallest distance between the speakers for which the interference of the sound waves is destructive? (b) If the speakers are out of

    asked by anonymous
  148. weather system

    Which weather system is bigger, a hurricane or an extra-tropical-cyclone?

    asked by Sara
  149. Chemistry

    In the experiment Nitration of Methyl Benzoate why is it important to add the nitric acid-sulfuric acid mixture slowly over a 15 minute period?

    asked by Kendra
  150. Science

    wht's needed 4 nuclear fusion to start? Hydrogen nuclie fuse?

    asked by Sara
  151. Environmental Science

    #33. In two or three well-developed paragraphs, explain how water is treated so that it can be used for safe drinking water. Include definitions of the terms potable and pathogens. my answer: There are many steps to how water is treated so that it can be

    asked by y912f
  152. Environmental Science

    #34. In two or three well-developed paragraphs, name and describe the five primary air pollutants and provide several sources of each. my answer: There are five primary air pollutants and some sources of each of them. The first pollutant is Carbon monoxide

    asked by y912f
  153. Pre-cal

    1) Solve the equation sinx(sinx+1) = 0 I am having trouble with the first step. Could I do sin x^2 + 1 =0?

    asked by Abby
  154. microeconomics

    A monopolistically competitive industry has the following structual characteristics:(1) a large number of firms,(2) no barriers to entry, and (3)product differentiation, relatively good substitutes for a monopolistic competitors products are available.

    asked by ronie
  155. English

    Can you please tell me if the following words are still used in English and if not, what shall I use instead? Baker's, butcher's, chemist's, newsagent's, tabacconist's, optician's, fishmonger's, shoe shop, shoe repairer, bookshop, jewellery shop, dairy,

    asked by Franco
  156. English-Ms. Sue

    I have to make a list of male characters from action movies, t.v., and video games that I have see recently. -Does this mean write their names? I also have to write a bunch of other traits that men are shown to have. This is what i have so far: *brave

    asked by Sara
  157. Anatomy

    Explain why a surgeon would use subq sutures duing abdominal surgery, but not during an open reduction and internal fixation of a fractured radius

    asked by Colleen
  158. earth

    the area around the great lakes was once covered by thick sheets of ice. Use the principal of isostasy to explain how the melting of these ice sheets has effected the land around the lakes?

    asked by matt
  159. physics

    1.The earth is constantly bombarded by cosmic rays, which are charged particles from outer space. moving vertically Find the force on one such cosmic ray− a proton that is instantaneously downward at 5.04 107 m/s at a point outside the atmosphere over

    asked by Sandhya
  160. physics

    A 53.0 kg boy and his 41.0 kg sister, both wearing roller blades face each other at rest. The girl pushes the boy hard, sending him backward with a velocity 3.00 m/s toward the west. Ignore friction. (a) Describe the subsequent motion of the girl, and then

    asked by Mathieu
  161. 6th grade

    what is the zapatista revolution

    asked by admir
  162. calculus

    consider the function f(x) = e^x(sinNx) on the interval [0,1] where N is a positive integer. a) Compute the integral from 0 to 1 of f(x). Evaluate this integral when N=5, N=10, and N=100. B) What happens to the graph and to the value of the integral as

    asked by anonymous
  163. brother:mother::fly:

    This isn't a question but those of you who are having troubles with brother:mother::fly: the answer is spry. It's a word but I didn't know it was a word until my parents gave me the answer LOL but this was a very handy site considering the fact I had the

    asked by Rachel
  164. Geometry-PLEASE CHECK ANSWERS!

    In isosceles triangle DEF, DE=DF. Which of the following is true? 1)

    asked by Laurie
  165. BIS/219 Business Information Systems

    What is the relationship of Information resources to the business user? Provide at least one example. Can somebody please explain this to me in English?

    asked by unsure
  166. math

    find the volume of a solid that has 3 by 3 ft 3ft high and 7ft by 5ft long

    asked by billy
  167. writing

    Can you help me correct these sentences? 1.She wants to become an environmental scientist she is especially interested in marine life. 2.If she can get a scholarship she would like to spend her senior year in New Zealand. 3.The Great Coral Reef almost

    asked by ruby
  168. Chemistry

    A gas occupies a volume of 140 mL at 35 degrees celcius and 97 kPa. What is the volume of the gas at STP? Please show the work.

    asked by Maria
  169. Biology

    41. HIV has become one of the most feared diseases of the world community in the last few decades. Antiviral drugs have been developed that help treat the disease, although no cure has yet been found. Many pharmaceutical approaches are being investigated

    asked by mysterychicken
  170. Chemistry

    A gas storage tank has a volume of 3.5*10^5 m^3 when the temperature is 27 degrees celcius and the pressure is 101 kPa. What is the new volume of the tank if the temperature drops to -10 degrees celcius and the pressure drops to 95 kPa?

    asked by Alexandra
  171. Global History

    How does the English government's attitude toward the Irish during the Irish famine in the late 1840's reflect the motivations for imperialism?

    asked by Chris
  172. Chemistry

    You are given a jar containing a mixture of three different solid substances. The particles of each substance are larger than 0.5 cm in diameter. All you know about the substances is that each is a pure metal. Describe a method for determining the

    asked by Haley
  173. Physics

    Which statement about the electric dipole moment is true? u=qd a) A molecule is a strong dipole if the net charge separation occurs over a short distsnce within the molecule b) the unit of u is C/m c)A dipole exerts a larger force on a point charge than on

    asked by Alexa
  174. Physics

    I am also not 100% sure about the following question... a dipole and a point charge at close proximity a)always repel each other b)always attract each other c) never interact electrically d) attract or repel eachother based on the location of the point

    asked by Alexa
  175. calculus

    Let A(x) be the area of the rectangle inscribed under the curve with vertices at (-x,0) and (x,0), x > 0. a. Find A(1). b. What is the greatest value of A(x)? Justify your answer. c. What is the average value of A(x) on the interval 0 < x < 2?

    asked by matt
  176. math

    i am thinking of a number between 20 and 50. it is an even number. it has exactly 9 factors. what is the number?

    asked by karen
  177. Chemistry

    In order to raise the temperature of 5.0 Kg of water from 20 deg. C to 30 deg. C, a 2.0 kg iron bar is heated and then dropped into the water. What should the starting temperature of the bar be? (Specific heat Fe is 0.22 cal/g-deg.)

    asked by Lexie
  178. Chemistry

    How mucyh heat is given up when 20 g of steam at 100 deg C is condensensed and cooled to 20 deg. C?

    asked by Ally
  179. Chemistry

    How much heat is required to change 10 grams of ice at 0 deg. C to steam at 100 deg C?

    asked by Ally
  180. Chemistry

    How much heat is required to change 10 g of ice at 0o deg C to steam at 100 deg. C?

    asked by Mari
  181. calc

    Let f be the function defined by f(x) = (x 2 + 1)e -x for -4 < x < 4. a. For what value of x does f reach its absolute maximum? Justify your answer. b. Find the x-coordinates of all points of inflection of f. Justify your answer.

    asked by john
  182. MATH

    Simplify | –5| – |–3 – 3|

    asked by hannah
  183. spanish

    it is a crossword puzzle 4 letters and it says Dan is a _ _ _ _ name need it in english and spanish

    asked by devi
  184. math

    Rewrite the expression in the simplest form without parentheses: 6(18 – y)

    asked by hannah
  185. Physics

    A mobile postive point charge is located between two parallel charged plates of charge densitys +o (top plate) and -o (bottom plate) at a distance d from the negative plate.the distance doubles (becomes 2d)between the negative (bottom) plate and the mobile

    asked by Michael
  186. English-Ms. Sue

    So for my second paragraph how would I start it off? -Describe not just how a man looks like, but what he values, and how he behaves. This time am I not describing a man from my point of view? Am I describing a man like, a man can be abusive, or nice, etc.

    asked by Sara
  187. History

    What is trace the path that they took from New York to Salt Lake City ?

    asked by Michaela
  188. History

    What is account of the famous siege of the Alamo ?

    asked by Michaela
  189. 10th grade

    What were the complications of decrees in the Ottoman Empire during the Age of Nation States?

    asked by Sam
  190. 10th grade

    What were the effects of the Balkan Wars that led to the Revolution during the Age of Nation States? (OTTOMAN EMPIRE)

    asked by Sam
  191. Chemistry

    is this statement true chemicals participating in a chemical reaction contain only potential energy?

    asked by Anonymous
  192. Chemistry

    A technician requires a 4L of an ammonia solution to have a pH of 11.55. What volume in liters, of ammonia gas at 25 degrees Celsius and 1 atm is necessary to achieve this result?

    asked by John Gold
  193. physics

    A double-slit interference pattern is created by two narrow slits spaced 0.21 mm apart. The distance between the first and the fifth minimum on a screen 55 cm behind the slits is 6 mm. What is the wavelength of the light used in this experiment? Having

    asked by deb
  194. Chemistry

    Does one calorie equal 4.184 Joules?

    asked by Anonymous
  195. Social Studies

    What kinds of conflicts have caused problems in coombia?

    asked by Anonymous
  196. math

    The candy shack has 20 pounds of mixed white and dark chocolates worth $7.50 per pound. white chocolates alone sell for $8.00 per pound and dark chocolates sell for $6.00 per pund?

    asked by Rj Garcia
  197. Chemistry

    is this right when a fuel is burned some of its chemical potential energy is lost as heat. and To convert kilojoules to joules dived the number of kilojoules by 1000 joules/1 kilojoule

    asked by Anonymous
  198. Chemistry

    if the temperature of a 500.0g sample of liquid water is raised to 2.00c how much heat is absorbed by the water? The specific heat of liquid water is 4.184J/(g*c)

    asked by Anonymous
  199. spanish

    in reference to the last question it has to be a four letter word with the 2nd letter being a (o) I am not sure but otherwise the other question across from it said my stomach after a spaghetti dinner and that is a 5 letter word where it runs into the last

    asked by devi
  200. math

    How many people do you need in a room in order to guarantee that there's a group of three people, each of whom has the same initials (first and last name only)?

    asked by Anonymous
  201. Physics

    If a proton is released from rest in a uniform electric field does electric potential at its position increase, stay the same, or decrese?

    asked by Anonymous
  202. Social Stuies

    What is resource to "the Old 300?"

    asked by Melea
  203. History

    Why the idea of manifest destiny may have been so attractive during the 1840s?

    asked by Melea
  204. 5th grade

    A KIND OF ROCK

    asked by LILLY
  205. math

    i am having a minor difficulty i've been stuck for over an hour and don't know what to do i don't know is this right ? = "+" or "-" # = number y=x (x+1)squared + (y+1)squared = 6 i substitute y (x+1)squared + (x+1)squared = 6 x squared + 2x + 1 + x squared

    asked by larry
  206. History

    What is territorial growth of United States during this period ?

    asked by Michaela
  207. literary

    I need to make a timeline chart for the oedipus trilogy .any ideas

    asked by juanita
  208. calculus

    What would be the force required to push a 100 lb. object along a ramp that is inclined 10 degrees with the horizontal?

    asked by Ken
  209. Honors Chemistry

    If 20 mL of 0.01 M aqueous HCl is required to neutralize 30 mL of an aqueous solution of NaOH, determine the molarity of the NaOH solution. ==> I got 0.01 M NaOH as my answer. Is this correct?

    asked by Emily
  210. just wondering

    what's higher a doctoral degree or a master's?

    asked by Anonymous
  211. hmm...?

    what is clinical psychology?

    asked by Anonymous
  212. math

    a store clerk has 600 pens in stock . he then issues 1/4 to a store . then issues another 1/6 to another store and 3/8 to the last store how much is still in stock?

    asked by will
  213. Honors Chemistry

    Equation: Fe2O3 + 2Al ---> 2Fe + Al2O3. How many grams of Fe2O3 react with excess Al to make 475g Fe? Can you show me step by step how to do it? My book says the answer is 679g Fe2O3.

    asked by Anan
  214. math

    graph y=x2,y=2x2 and y=1/2x2 on the same

    asked by isabel
  215. reading

    I was just curious, we're starting to read The Wave by Todd Strasser, and I was wondering if anyone has read it and if they have any comments on it-good or bad? I just kinda wanna get an idea of how good or bad it is and what to expect. Thanks! ~aShLeY

    asked by Ashley
  216. biology honors

    Summarize Griffith's transformation experiments

    asked by kelly
  217. calculus

    differentiate y=x^2x. show all work

    asked by Anonymous
  218. Earth Science

    If the continental crust were thinner than its average thickness of 40 km, would it depress the mantle more or less than it does now? Explain.

    asked by Matt
  219. Chemistry

    in this experiment you are you will begin by preparing a dilute soultion of sodium hydroxide by taking 50 ml of 3 M NaOh stock solution and diluting it with 250 ml of water. i found that and the answer was .5 but how do i do this b. calculate the number of

    asked by Chris
  220. Chem Pre-Lab HELP!

    Write the complete and net ionic equations for the following reactions. Be sure to indicate the states of the reaction products. 1) AgNO3(aq) + NaCl(aq) ----> 2) CaCl2(aq) + Na2SO4(aq) ----> 3) Pb(ClO4)2(aq) + NaOH(ag) ----> 4) (NH4)2SO4(aq) + BaCl2(aq)

    asked by Macey
  221. physics

    A double-slit interference pattern is created by two narrow slits spaced 0.21 mm apart. The distance between the first and the fifth minimum on a screen 55 cm behind the slits is 6 mm. What is the wavelength of the light used in this experiment? Having

    asked by deb
  222. English

    Hi, my teacher edited my paper and she said I need to pick a different transitional word rather than "next" or "then". Any suggestions?

    asked by Anonymous
  223. Geometry / Math

    Is a rectangular prism a polyhedron Thanks

    asked by Anonymous
  224. social studies

    what are the three main types of resourses used for making,selling,and using goods and services?

    asked by brian
  225. earths core

    what are a few (1 or two) reasons why the core cant be of lonestones?

    asked by James
  226. Math

    integrate (sinx)^(5)(cosx)^(12)from 0 to (pi/2) I'm having problems just even integrating it... I tried breaking it up (sin^(2)x)^(2)(cos^(2)x)^(6)(sinx)dx then doing u-sub with u=cosx and du= -sinx but then I get stuck... the answer is 8/3315 just don't

    asked by emath
  227. Honors Chemistry

    Fe2O3 + 2Al --> 2Fe + Al2O3 How many grams of Fe will form when 97.6g Al2O3 form? Please & Thank you

    asked by Ana
  228. HCR/230

    • Post a 200- to 300-word response to the following: Compare cost control strategies of employer-sponsored health plans, in which employers buy from insurance companies, to self-funded health plans, in which employers cover costs of benefits. Include the

    asked by Anonymous
  229. chemistry

    What is the molecular structure of the molecule AlCl3? What characteristic is notable about the structure that helps us to understand the acidic nature of AlCl3?Write a chemical reaction between AlCl3 and NH3 ignoring any reaction between AlCl3 and the

    asked by kiki
  230. 5th grade math

    what is the simplest form for eighteen ninethes

    asked by olivia
  231. Calculus

    Find the derivative of the given function at the indicated point. (use f'(a)=lim [f(a+h)-f(a)]/h as h approaches 0) This is what I have so far: [1/(x+h) - 1/2]/h = [2 - (x+h)]/(h(x+h)(2)) = [2-x-h]/(h(x+h)(2)) ...and now I'm stuck. Help? Thx

    asked by Momo
  232. ChEmIsTrY--THANK YOU!

    Is these true or false: -Every Bronsted-Lowry acid is also a Lewis acid. -Conjugate acids of weak bases produce more acidic solutions than conjugate acids of strong bases. Thank you very much!

    asked by ChemistryStudent2010
  233. Biology

    41. HIV has become one of the most feared diseases of the world community in the last few decades. Antiviral drugs have been developed that help treat the disease, although no cure has yet been found. Many pharmaceutical approaches are being investigated

    asked by mysterychicken
  234. math

    4 6/9 + 3 7/12=

    asked by anthony
  235. Honors Chemistry

    I got 206.67 g Fe, DrBob222

    asked by Ana
  236. math

    an airline passanger fell asleep halfway to her destination. When she woke up, the distance remaining was half the distance traveled while she was asleep. What portion of the trip was she asleep?

    asked by sammy
  237. chemistry

    Mare is preparing an experiment using 3 cups, one made of paper, one of plastic and one of glass. She plans on pouring 50 ml of hot water from a pitcher into each of the 3 cups and record the temperature in 5 minute intervals. What is the independent

    asked by Leah
  238. chemistry

    ) Mare is preparing an experiment using 3 cups, one made of paper, one of plastic and one of glass. She plans on pouring 50 ml of hot water from a pitcher into each of the 3 cups and record the temperature in 5 minute intervals. What is the independent

    asked by Leah
  239. general biologt

    Water freezes in the crack in this boulder and expands. Over time pieces of the boulder will break off. What type of wathering effects is this an example of? a. wedging b. hydration c. carbonation d. reduced pressure

    asked by Toni
  240. Biology

    Will O2 passively diffuse and bind with hemoglobin that is less than 1mm from the surface of a blood sample? The percent of hemoglobin bound with O2 is different at high (10% CO2) and low (5% CO2) CO2 concentrations when the Po2 equals 0mmHg. Is that true?

    asked by Alex
  241. Physics

    Mercury is poured into the open end of a J-shaped glass tube, which is closed at the short end, trapping air in that end. How much mercury can be poured in before the mercury overflows? Assume air to act like an ideal gas. The long and short arms are 1 m

    asked by Isabel
  242. biology

    What is the source of energy driving the hydrolic cycle? a. evaporation of the ocean water b. heat conducted from the earth's core to the surface c. radiant heat from the sun d. air currents returning to the earth's surface

    asked by BECKY
  243. Chemistry

    A buffer is created by mixing equal concentrations of NH4+ and NH3. Calculate the volume of both solutions needed to create a buffer of pH=8.75 with a total volume of 100 mL.

    asked by Bodhi
  244. Algebra 2

    How do you simplify n^3 ÷ n^╥ (pi=╥) Answer: Please & Thank you

    asked by Ana
  245. biology

    Smooth edged leaves (S) dominant over rough edged leaves (s). Two plants heterozygous for smooth edged leaves are crossed. What proportion of the offspring are expected to be smooth edged leaves? a. 1/4 b. 1/2 c. 3/4 d. 1

    asked by BECKY
  246. Honors Chemistry

    What is the molecular structure of the molecule AlCl3? What characteristic is notable about the structure that helps us to understand the acidic nature of AlCl3?Write a chemical reaction between AlCl3 and NH3 ignoring any reaction between AlCl3 and the

    asked by HonorsChemistryKid
  247. grammar

    Hello. I could really use some help with my ESSAY. If anyone could tell me what they think of it and if anything needs corrected. Thanks Jess Well I guess the best place to start is the beginning. I was born in Kentucky, but only lived there for five

    asked by Jess
  248. Honors Chemistry

    Every Bronsted-Lowry acid is also a Lewis acid. Why is this statement false? Thanks

    asked by Hello
  249. MATH 4TH GRADE

    WHAT IS 5% OF 600

    asked by JOHN
  250. pre calc

    (1/x^2-49)/(1/x+7)?

    asked by Karissa
  251. science

    What are some facts about metaphase?

    asked by mic
  252. Physics

    Two blocks are connected by a light string passing over a pulley. The inclined surfaces are frictionless, and the effects of the pulley can be ignored. The value of m1 = m2 = 1.0 kg and θ2 = 43.4 degrees. If the blocks accelerate to the right with

    asked by Katie
  253. Physics

    We learned in lecture that the magnetic force on a charge q moving with velocity v in a magnetic field ~B has the form F = q~v × B One important fact about the cross-product is that for two vectors A and B , the following is true A × B = −B × A which

    asked by Jess
  254. physics

    At a certain location on the Earth, the horizontal component of the Earth’s magnetic field is 2.5 ·10−5 T due North. A proton moves eastward with just the right speed for the magnetic force on it to balance its weight so the net force on the proton

    asked by Anonymous
  255. pre calc

    Simplify- (x^2+2x)/(x^2-x) *I got x(x+2) for the numerator and I couldn't get the denominator, but it was wrong help please

    asked by Karissa
  256. Honors Chemistry

    How does heating or boiling a substance affect its pH?

    asked by Emily
  257. english

    What is the difference of "there" "they're" and "their"?

    asked by Jenny
  258. pre calc

    Express the function f(x)=1/(x-2)in the form g of h if h(x)=x-2. Find the function g(x). g(x)=?

    asked by Karissa
  259. Science

    wht's needed 4 nuclear fusion to start? all the 8 protons of energy?

    asked by Sara
  260. Chemistry

    Which measuring device would you use if you needed to know the volume of a liquid very precisely?Why?

    asked by pasely