Questions Asked on
December 13, 2007

  1. Chemistry

    What volume of O2 is required to react with excess CS2 to produce 4.0L of CO2 Assume all gases at STP. Not sure what I am doing wrong, but the answer I am getting is not one of the answers. 4L/X mole=22.4 L/1 mole ===>.1786 mols Balanced equation: O2 + CS2

    asked by T
  2. Calculus

    Let R be the region in the first quadrant under the graph of y=1/sqrt(x) for 4

    asked by Anonymous
  3. math

    1)Find a1 in a geometric series for which Sn=300,r=-3,and n=4 A)15 B)15/2 C)-15 D)1/15 I chose A 5)Find the fifth term of the sequence in which a1=-3,and aN+1=3aN-n A)-301 B)-99 C)-193 D)-341 I don't know

    asked by Jon
  4. Chemistry (materials)

    I have 3 questions: 1) how might the actual structure of a diamond help explain why it is sometimes found in the form of large, single crystals? 2) what feature of graphite's structure might account for its usefulness as a lubricant? 3) why are fullerenes

    asked by Michelle
  5. chemistry - quant.

    I need help calculating the pH of a solution that is .0400M Na3AsO4 I was trying to calculate the pH with [H30+]=sqrt(ka1*ka2) What is the correct way to calculate this? Thankyou

    asked by anon
  6. Astronomy

    If a comet has a perihelion distance of 1.AU and an orbital period of 125 Earth years.. What is the comet's aphelion? Cannot seem to find the correct calculation

    asked by Liz
  7. Chem

    The melting point of KCl is 776 C whereas the melting point of NaCl is 801 C. 1. Identify the type of bonding in each substance. A: Both NaCl and KCl are ionic. 2. Account for the differences in the boiling points of the substances using principles of

    asked by Needs assistance
  8. maths

    how do you write 2.089 in expanded form

    asked by christina
  9. science lab

    I did this lab experiment below and I am stumped this question:given the current warming trend of our planet, over time (generations of parents and offspring) what do you predict will happen to the species of wooly worms? THE WOOLY WORM HUNT is an exciting

    asked by Maggie R
  10. chemistry

    How do you find the half-life of an element? Please explain and show me how to do this. I know the answer is 14.3 days, but I don't know how to work it. thank you! the problem is: After 42 days, a 2.0-g sample of phosphous-32 contains only 0.25g of

    asked by Ryan
  11. math

    If there are 1200 calories in one pound of ground beef, how many calories are in 3 oz of ground beef?

    asked by concetta
  12. Law and Ethics

    I have to create a power point presentation comparing and contrasting the roles that ethics and laws play within health and human servies organizations. Do youm know any good websites that I can use as a reference to complete my presentation?

    asked by Jess
  13. URGENT HELP: calculus - limits at inifinity

    1.The efficiency of an internal combustion engine is: efficiency (%) = 100 [1 - (1/(x/y)^c)] where x/y is the ratio of the uncompressed gas to the compressed gas and C is a positive constant dependent on the engine design. Find the LIMIT of the efficiency

    asked by Anonymous
  14. math

    1)Find the third iterate x3 of f(x)=x2-4 for an initial value of x0=2 A)-4 B)4 C)12 D)-12 I chose C 2)Use Pascal's triangle to expand:(w-x)5 This ones long so I chose w5-5w4x+10w3x3-10w2x4+5wx4-x5 3)Use the binomial Theorem to find the third term in the

    asked by Jon
  15. Math

    A carnival game consists of rolling a single fair die, with the following results: you win $8 for a 6, $7 for a 5, and lose $3 for any other number. Set a probability distribution, and calculate (already did) the Expected value = .50 Variance= 24.58

    asked by Anastasia
  16. Math - Logarithmic

    Solve: 2^(5x-6) = 7 My work: log^(5x-6) = log7 5x - 6(log2) = log7 5x = log7 + 6(log2) x = (log7 + log2^6) / 5 And textbook answer: (log7) / (log2) What did I do wrong?

    asked by Anonymous
  17. Astronomy

    A planet is growing by accretion of material from the solar nebula. Suppose that as it grows, its density remains constant. Does the force of gravity at its surface increase, decrease, or stay the same? Why? Also, What would happen to the surface gravity

    asked by Liz
  18. Astronomy help

    If a comet has a perihelion distance of 1.AU and an orbital period of 125 Earth years.. What is the comet's aphelion? Cannot seem to find the correct calculation

    asked by Liz
  19. world history

    Give me suggestions on the Change over Time Essay, or Changes and Continuities Essay. I am more interested on the content and whether or not I covered the requirements. Below the essay is a rubric. Provide me tips on what to improve, expand, etc. Feel free

    asked by mimi
  20. Algebra

    2(x-3)-3(x+5)=3(x-2)-7

    asked by Amanda
  21. science

    write a balanced equation - we have to do about 20 would be grateful if someone could show me first 2 1. silver + chlorine (arrow towards sc) silver chloride 2. hydrogen + chlorine (arrow towards) hydrogen chloride

    asked by sam
  22. science

    THE WOOLY WORM HUNT is an exciting "game" where the students are the Predators, hunting the great (and desirable) wooly worm. The class is given 60 seconds to pick up as many colored wooly worms as possible from the 1400 worms scattered across the Prep's

    asked by Anonymous
  23. Algebra

    There are 850 Douglas fir and ponderosa pine trees The company paid an average of $300 for each ponderosa pine. If the company paid $217, 500 for the trees, how many of each kind did the company buy?

    asked by Amanda
  24. math

    A classroom table is 1 meter wide and 1.75 meters long. How many 39 centimeter chairs can fit around the table?

    asked by hailey
  25. Algebra Word Problem

    A rectangle has dimensions of 12x8inches. If a uniform border is added, then the new rectangle has twice the area of the old rectangle. a) Find the width of the border b) find the new dimensions of the rectangle

    asked by Ray
  26. Physics

    Which colored light bulb, red, orange, yellow, green, or blue, emits photons with the least energy? Explain. (b) Which emits photons with the greatest energy? Explain

    asked by Mary
  27. Math

    The decimal form 1.46 becomes ______ expressed as a percent. 1- .146% 2- 1.46% 3- 14.6% 4- 146% 1.46 x 100 = 146% is this correct?

    asked by Kate
  28. science

    What is the majority compound in cells? What is the majority element in cells? What is the second most major element in cells? Why do animals contain more calcium than plants?

    asked by Alicia
  29. astronomy help please

    A planet is growing by accretion of material from the solar nebula. Suppose that as it grows, its density remains constant. Does the force of gravity at its surface increase, decrease, or stay the same? Why? Also, What would happen to the surface gravity

    asked by Liz
  30. physics

    Hi! I have a problem for physics homework and I though I knew how to solve it but apparently it is wrong, please help! 'Two cars, one of mass 1000 kg, and the second of mass 2400 kg, are moving at right angles to each other when they collide and stick

    asked by Ty
  31. economics

    If something happens and foreign consumers begin to buy more goods and services made in the United States, everything else held constant, what do you predict will happen to aggregate demand? I think it will move to the left.

    asked by Tabby
  32. MATH

    THERE ARE 7 GIRLS ON A BUS EACH GIRL HAS 7 BACKPACKS IN EACH BACKPACK, THERE ARE 7 BIG CATS FOR EVERY BIG CAT THERE ARE 7 LITTLE CATS ? HOW MANY LEGS ARE THERE IN THE BUS?

    asked by ZACK
  33. math

    If a penagonal prism has 7 faces and 10 verticies How man Edges does it have

    asked by jackie
  34. science

    what is the driving force of evolution among natural selection, genetic diversity, and environmental stress? The answer is environmental stress but i am not sure exactly why....can someone explain?

    asked by Anonymous
  35. Math

    Our teachers are having a toy drive. Mrs. A collected 10 more toys than Mr. B. Mrs. C collected twice as many toys as Mr. B. Mr. D collected 3 less than Mrs. C. Mrs. E collected 50 more than Mrs. A. Together they collected 487 toys in all and gave them to

    asked by Brandon
  36. Algebra II

    Solve x^4 - 12x - 5 = 0 given that -1 + 2i is a root. I’ve used synthetic division to get the answers x = 1 +/- 2i , 1 +/- sqrt 2 I’ve having trouble checking the answers though because of that imaginary number. How can I check these kind of problems?

    asked by Nick
  37. statistics

    A specific brand of bike comes in two frames, for males or females. Each frame comes in a choice of two colors, red and blue, and with a choice of three seats, soft, medium, and hard. a) Use the counting principle to determine the number of different

    asked by Rose
  38. world history// suggestions for essay

    Please provide me suggestions for the Change over Time Essay, or Changes and Continuities Essay. Below is a rubric. Provide me tips on what to improve, expand, etc. Feel free to provide me some examples or give me topics/subjects to elaborate on. The

    asked by Anonymous
  39. Spanish for Sam

    OK. No sense doing a national holiday that has already passed. Here are 3 ideas: 1. Navidad = Christmas Day, December 25th. 2. Año Nuevo = New Year's Day, Jan 1st. 3. El Día de los Reyes = Epifanía = Epiphany, Jan. 6th = the day Spanish children get

    asked by SraJMcGin
  40. DR Bob one more

    1. calcium carbonate < calcium oxide + carbon dioxide dr. Bob Hydrolic acide + sodium hydroxide < sodium chloride + water this cant be balanced already as assignment says we must balance each one

    asked by sam
  41. science

    balance FeS2 + O2 < Fe2O3 + So2

    asked by liz
  42. Physics

    I thought I did the problem right, but I don't think I came out with the right answer! Please someone check to see if I got this problem right. Calculate the force of gravity between Earth (mass=6.0*10^24 kg) and the moon (mass=7.4*10^22 kg). The average

    asked by Emily
  43. Math

    Compare the population per square mile in Asia to the population per square mile in North America for the year 2000. Population in Asia in 2000 was 4,028,000,000. Population in North America in 2000 was 305,000,000.

    asked by Patricia
  44. lit

    o Do members of your community look like you? In what ways do they look the same or different? o How do leaders within your community treat people who are like you? How do they treat people who are different? o How do other members of your community treat

    asked by Tasha
  45. literature

    im writing a research paper on the easy company of wwii. well i have some info but my teacher said i have to make it controversial. any ideas on how i could do that. if so please get back to me

    asked by jack
  46. calculus

    A piecewise function is given. Use the function to find the indicated limits, or state that a limit does not exist. (a) lim is over x-->d – f(x), (b) lim is over x-->d + f(x), and (c) lim is over x-->d f(x) x^2 - 5 if x < 0 f(x)= -2 if x ->0 ; d = -3 1.

    asked by Kelly
  47. Algebra HELP

    USE LINEAR COMBINATIONS TO SOLVE THE SYSTEM OF LINEAR EQUATIONS (please show steps) 1) -X+8Y=16 2) 4X+5Y=-2 3)4Y=15-3X 3X+4Y=36 5X-4Y=-23 2Y=3X+21

    asked by electra
  48. Chem

    In the van der waals equation, the constants a and b are: 1)used to correct for the finite volume of gas molecules and the attractive forces between molecules 2)equal to each other for any real gas 3)used to correct for the difference between Celcius and

    asked by Needs assistance
  49. reading

    what is text clues?

    asked by lan
  50. Physics

    Robin Hood is walking through Sherwood Forest when he comes upon Sheriff of Nottingham. The Sheriff tells Robin Hood that he is going to arrest hum for numerous misdeeds. Robin pulls out his bow, loads an arrow, puls the bow back 0.70 m, and shoots an

    asked by Jennifer
  51. chemistry

    Give the names of these acids. A. HNO(subscript 2) B. HMnO(s.s. 4) C. HCN D. H(s.s. 2)S Write the names of these bases. A. LiOH B. Pb (OH) s.s. 2 C. Mg(OH)s.s. 2 D. Al(OH)s.s. 3

    asked by anonymous
  52. dr bob HELP PLEASE

    thanks dr Bob got through 6 now I am stuck again 1. Hydrochloric acid + Sodium hydroxide > sodium chloride + water 2. Magnesium hydroxide + hydrochloric acid > Magnesium chloride + water

    asked by sam
  53. Spanish for Sam

    At this point I only know you have a project due Monday. The sooner you give me more particulars, the sooner I can do research, or whatever else you need. Sra

    asked by SraJMcGin
  54. world history/middle east/economics

    nashville titans could sial to their game by cruising up the (10 blanks) River to its confluence with the (9 blanks) River then on to the (4 blanks) River.

    asked by Anonymous
  55. economics

    Which federal agency is responsible for managing inflation? The Department of Housing and Urban Development, The World Trade Organization, or The International Monetary Foundation? I think it is The World Trade Organization.

    asked by Tabby
  56. geometry

    a right traingle has legs of lengths 3 centimeters and 5 centimeters. Use the pythagorean theorem to find the area of a square drwan on the hypotenuse of the triangle.

    asked by Andrew
  57. BEH / 225

    On the text from BEH/225 on the book Personality Ch.11 pp. 421 on the summary table Defence Mechanisms. What defense mechanisms have you noticed in the people around you? What do you see as the advantages and disadvantages of these defence mechnaisms?

    asked by Martin
  58. Math

    How do you find the tax, and estimate the tip of a price?

    asked by Niara
  59. math

    how do you find the greatest common of. 16 and 42; 8 and 18; 77 and 15

    asked by ryan
  60. science pproject

    what would happen top a sunflower if it were left without sunlight for six days

    asked by Anonymous
  61. english

    fallen angels we read that book in class. now my teacher want us to build a handbook for new recruits on surviving vietnam. k my question is how do u make a handbook i am so lost thanks

    asked by bre bre
  62. physics

    what are the two opposing forces at balance in our sun? describe how the two opposing forces balance each other

    asked by rosio
  63. statistics

    Select five random numbers between 70 and 100. Calculate the mean, median, mode, and midrange of these numbers. Based on your calculations, which measure of central tendency best represents these numbers?

    asked by Rose
  64. Math - Logarithmic

    Is the following correct when restating logs with variables to exponential? Log: log_a(a^3) --- base = a Exp: a^3 = a I know when dealing with real numbers, this is what you do: Log: log(10^5) Exp: 10^5 = 100 000

    asked by Anonymous
  65. math

    how many ounces are in a pound?

    asked by christina
  66. World history

    May you give me suggestions on how to improve this essay: Change of Time (or Changes and Continuities Essay)?

    asked by Anonymous
  67. Microsoft PowerPoint

    Please can anyone help me with my problem. Does anyone know how or can tell me a free website to find out how to create a Microsoft Powerpoint slide presentation(8) with speaker notes,visual aids and graphics.

    asked by Mckenzie
  68. statistics

    Select five random numbers between 70 and 100. Calculate the mean, median, mode, and midrange of these numbers. Based on your calculations, which measure of central tendency best represents these numbers?

    asked by Rose
  69. statistics

    Construct a frequency distribution of the ages that 25 randomly selected smokers started smoking: 26 26 25 17 16 16 14 17 21 16 16 18 17 15 15 19 16 17 22 15 19 17 16 27 16

    asked by Rose
  70. math

    60 is 25% of what number

    asked by jordan
  71. math

    40% of what number is 82

    asked by jordan
  72. math

    73 is 20% of what number

    asked by jordan
  73. science

    how do you balance the equation below? Mg + O2 > MgO

    asked by liz
  74. Wind energy

    How does wind energy get to you? Like I know you would have to have a mill in your yard but how does it get to the house?

    asked by Randi
  75. linguistics

    what do you mean by a "target language"???...

    asked by pray_the_rosary
  76. art

    Which phrase best describes the style of Rodin's sculptures? psychological and unfinished, Neo-Classical yet light-hearted, unfinished and light-hearted, unfinished yet polished? I think it is unfinished and light-hearted.

    asked by Tabby
  77. sci

    Although most salamanders have four legs, the aquatics salamander shown below resembles an eel. It locks hind limbs and has very tiny forelimbs. propose a hypothesis to explain how limbless salamanders evolved according to Darwin's theory of natural

    asked by Amber
  78. world history

    who was the German monks credited with starting a religious revolution after he had grown dis-illusioned with what he perceived as the corruption and worldliness of the Roman Catholic Church?

    asked by Roderick
  79. art

    How do we know that the woman in "Portrait of a Lady" was a member of the upper class?

    asked by Tabby
  80. sra McGuin

    Hi I am making a recipe for a smoothie please edit my draft as I will turn it in tommorrow Como hacer un batido de fresas y kiwis 1. Primero, necesitas tener una licuadora, cinco kiwis, seis fresas, jugo de nurijo, hielo, un cuchmillo, y unos vaos. 2.

    asked by sam
  81. economics

    Decreasing the money supply involves which type of economic policy? I think it is Monetary policy.

    asked by Tabby
  82. physiology

    what is the procedure for WBC count

    asked by suhani
  83. Anatomy

    how does hemoglobin carry O2 in the blood?

    asked by Jeani
  84. Orbital Dynamics

    The zero-velocity value of the Jacobi integral at the L2 point of the Earth-Moon system is C= -1.59411. Suppose a spacecraft is newar Earth (r2=1/60 in our descriptions). Approximately waht speed must the craft have realtive to the rotating system if it is

    asked by Ali
  85. Orbital Dynamics

    The zero-velocity value of the Jacobi integral at the L2 point of the Earth-Moon system is C= -1.59411. Suppose a spacecraft is newar Earth (r2=1/60 in our descriptions). Approximately waht speed must the craft have realtive to the rotating system if it is

    asked by Ali
  86. Science

    What is a plant and animal seen regularly in the sotheast region (Georgia)?

    asked by Danny
  87. Math

    What is the product of 7/16, 4/3 and 1/2?

    asked by Kate
  88. philosophy

    Beautiful harmony comes from things that are in opposition to one another [Heraclitus ok i need to write my personal philosophy and i cant think of any examples of this quote for my body pargraphs...except velcrow..i don't think that a good one thought

    asked by chels
  89. social study

    how is thegeography of Italy and Greece similar?

    asked by Chris
  90. science

    Beside people, what is the only animal that develops colon cancer on its own?

    asked by Amanda
  91. Algebra One

    -x/3=2/5

    asked by Aaliyah
  92. wr

    what is a grumpy ocean dweller? (4) letters? ocean greetings? (5) letters? Thank you! Thank you!!1 crossword!

    asked by roy
  93. French

    How do you invert the following into a question? Elle dine a huit heures.

    asked by Melissa
  94. Math

    OK I need so much help: i can't figure out this problem, and if i don't get it right i get an f on the assignmrnt: ok here is the problem: 5/6n+4= 5 7/8 HELP

    asked by Serena
  95. com 125

    What questions do you ask when evaluating a source, and why?

    asked by Anonymous
  96. Algebra I

    Wrtie a function using the table below. X Y 5 2 0 7 5 12 10 17

    asked by Mary
  97. literature

    can anyone help me with this exam 00779000 please i need your help

    asked by Ian
  98. math

    what number is 32% of 1,000

    asked by jordan
  99. Math

    2x+y=5 x-y=4 i kno the answer but i just want to make sure..am i in rite place lol

    asked by Nemo
  100. anatomy

    do arteries carry blood to or from the heart?

    asked by Hillary
  101. math

    57% of 109 is what #

    asked by jordan
  102. algebra

    What is 2 = x+1 ?

    asked by Teresa
  103. algebra

    (-1,-2),(2,6)

    asked by Anonymous
  104. sci

    description of a typical precipitation and temperature for summer and winter. Then identify the characteristics of a plant and animal that is seen regulary in your region? How do the characteristics relate to the amount of rain or sunlight in your region?

    asked by jamie
  105. Math

    I'm trying to calculate probablity of dependent and independent events. For example, from 3 nickels, 2 dimes, and 5 quarters, what is the probability of drawing 1 nickel, 1 dime, and 1 quarter in that order without replacement? Or drawing the same in any

    asked by Danielle
  106. english

    What does the term arbitrary mean?

    asked by nancy
  107. world history

    what is the name for the periord in which there was a production shift from simple hand tools to complex machines and from human and animal power to steam power?

    asked by Roderick
  108. math

    I'm just not good at word problems can someone help pleaes thanks a head of time An arithmetic student needs an average of 70 or more to receive credit for the course. She scored 89, 76, and 65 on the first three exams. Write an inequality representing the

    asked by keauanna
  109. Math

    I am in Calculus and am currently learning how to find the Area of a Surface of Revolution. I cannot understand what the surface of revolution (whether it's the x-axis, y-axis, or y=6) is. For example, I had a problem saying to use the washer method to

    asked by Suzie
  110. english

    I have to write a paragraph about a vacation spot using order of importance and I have no idea where to begin. Can someone help me start?

    asked by Tabby
  111. economics

    Will buying bonds decrease the money supply?

    asked by Tabby
  112. Eth

    o Trends in immigration will continue to shape the face of the United States. What will this face look like in the year 2050? o How can the country best prepare for the changing race and ethnicity of its current and future citizens?

    asked by kisha