Questions Asked on
March 25, 2014

  1. social studies check answers

    1.C 2.D 3.A 4.D 5.C 6.B 7.D 8.B 9.B 10.A 1.The story of Omar best reflects A. opportunities for people in the Pampas. B. struggles faced by families who work the mines of the Andes. C. hardships undertaken by indigenous farming families. D. benefits of

    asked by matt
  2. Phys

    A typical lightning bolt has about 10.0 C of charge. How many excess electrons are in a typical lightning bolt?

    asked by Anonymous
  3. math

    the time is 6:10 is the hour hand closer to 6 or 7? why?

    asked by rakia shorter
  4. physics

    A 100-g toy car is propelled by a compressed spring that starts it moving. The car follows the curved track Show that the final speed of the toy car is 0.687 m/s if its initial speed is 2.00 m/s and it coasts up the frictionless slope, gaining 0.180 m in

    asked by effraim
  5. Math

    Coach kent brings 3 quarts of sport drink to soccer practice. He gives the same amount of the drink to each of his 16 players. How many ounces of the drink does each player get?

    asked by Sarani
  6. chemistry

    Consider a buffer solution consisting of CH3NH3Cl and CH3NH2. Which of the following statements are true concerning this solution? (Ka for CH3NH3+ = 2.3 x 10 -11). 1. A solution consisting of 0.1 M CH3NH3Cl and 0.1 M CH3NH2 would be a more effective buffer

    asked by bekah
  7. Grade 12 Calculus

    A rectangular piece of paper with perimeter 100 cm is to be rolled to form a cylindrical tube. Find the dimensions of the paper that will produce a tube with maximum volume. I have made it up to getting an equation for V(w).

    asked by Q
  8. Literature/Social Studies (Ms. Sue!)

    The New Frontier" by John !@#$%^&ennedy. 1. What ideas does Kennedy express by quoting William Brandford? A: By quoting William Bradford, Kennedy expresses the idea that, despite great difficulties, man can overcome anything through their will and

    asked by Anonymous
  9. Chemistry

    The degradation of CF3CH2F (an HFC) by OH radicals in the troposphere is first order in each reactant and has a rate constant of k=1.6×108M−1s−1 at 4∘C. If the tropospheric concentrations of OH and CF3CH2F are 8.1×105 and 6.3×108 molecules cm−3,

    asked by Rebecca
  10. CHEM

    can you show me the formula for this problem. calculate the grams of NaOH present in 9.0 ml of a 8.0 (m/v) NaOH solution. thank you

    asked by julia
  11. Chemistry

    Can someone show and explain to me step by step how to do the problems? I feel like I am doing it incorrectly. a) The solubility of PbI2 is 3.67 mg per mL. What is the Ksp? b) Three drops of 0.20 M potassium iodide are added to 100.0 mL of 0.010 M lead

    asked by Miki
  12. calcules

    A company wishes to run a utility cable from point A on the shore to an installation at point B on the island. The island is 6 miles from the shore. It costs $400 per mile to run the cable on land and $500 per mile underwater. Assume that the cable starts

    asked by jasmine22
  13. Grade 12 Calculus

    For an outdoor concert, a ticket price of $30 typically attracts 5000 people. For each $1 increase in the ticket price, 100 fewer people will attend. The revenue, R, is the product of the number of people attending and the price per ticket. a) Let x

    asked by Q
  14. spanish - HELP!

    Fill in the blank with the correct direct object pronoun, based on the word in parentheses that best complete this sentence Tu ____ buscas. (nosotros) I need help with this!

    asked by Abby!
  15. Science

    The force of gravity on Jupiter is much stronger than the force of gravity on Earth. Which of the following explains why this is true?

    asked by norna
  16. PHysics XXX

    An airplane travels 330 m down the runway before taking off. Assuming that it has constant acceleration, if it starts from rest and becomes airborne in 9.00 s, how fast (in m/s) is it moving at takeoff? A 73.3 m/s B 36.7 m/s C 1490 m/s D 660 m/s

    asked by Luis
  17. Chemistry

    The Ksp of manganese (II) hydroxide, Mn(OH)2 is 2.00x10^-13. Calculate the solubility of this compound in g/L?

    asked by Joe
  18. Physics

    Thanks for taking a look! A baseball of mass m1 = 0.46 kg is thrown at a concrete block m2 = 8.25 kg. The block has a coefficient of static friction of μs = 0.81 between it and the floor. The ball is in contact with the block for t = 0.165 s while it

    asked by Michelle
  19. Physics

    Assume that all of the mass of a bicycle wheel is concentrated at its rim. Such a wheel of mass 1.2 kg and radius 30 cm starts from rest at the top of a hill 100m long and inclined at 20 degrees to the horizontal. What will be the speed of the wheel at the

    asked by kelsey
  20. Calculus

    There are 50 apple trees in an orchard, and each tree produces an average of 200 apples each year. For each additional tree planted within the orchard, the average number of apples produced drops by 5. What is the optimal number of trees to plant in the

    asked by Q
  21. physic

    The sports car in Figure 6 is travelling along 30 banked road having a radius of curvature of ñ=152 m. If the coefficient of static friction between the tires and the road is µs=0.2, determine the maximum safe speed so no slipping occurs. Neglect the

    asked by zainab
  22. Enghish Identify pronoun errors

    Identify the type of pronoun error in the sentence. 1 Neither of we boys was going to the ball game. A)reference B)case C)agreement 2)The papers are on the desk that I corrected. A)reference B)case C)agreement 3)The traffic pattern on the new road is

    asked by Mary
  23. physics

    a spaceship is moving at 1000 m/s release a satellite of mass 1000 kg at a speed of 10 000 m/s. what is the mass of the spaceship if it slows down to a velocity of 910 m/s?

    asked by Anonymous
  24. Algebra

    Which kind of function best models the set of data points (–3, 18), (–2, 6), (–1, 2), (0, 11), and (1, 27)? • linear • quadratic • exponential • none of the above

    asked by Sandra
  25. Science

    PLEASE HELP !!!!! how are newtons second and third laws of motion important to your everyday life?

    asked by Anonymous
  26. Pre Algebra

    What figure has exactly 4 lateral faces that are triangles?

    asked by Steve
  27. calcules

    cylindrical box will be tied up with ribbon as shown in the figure. The longest piece of ribbon available is 130 cm long, and 10 cm of that are required for the bow. Find the radius and height of the box with the largest possible volume.

    asked by jasmine22
  28. physics

    In a water park, people walk up a ramp before diving into the water below. If they cover a horizontal distance of 100 meters before diving down 50 meters, what is the angle made by the ramp with the ground?

    asked by daniel
  29. Trigonometry

    Find all solutions of the equation in the interval [0,2pi). sec(theta)+2=0 Write your answer in radians in terms of pi

    asked by Pascal
  30. Chemistry 2

    CALCULATE THE SOLUBILITY OF CuBr in 0.69 M NH3

    asked by Joe
  31. Literature/Social Studies

    "The New Frontier" by John !@#$%^&ennedy. 1. What ideas does Kennedy express by quoting William Brandford? A: ? 2. What reasons does Kennedy offer for going to the moon? A: Kennedy offers reasons such as the task of going to the moon being difficult, the

    asked by Anonymous
  32. History8 Check Answers?

    1) The major problem with the Articles of Confederation was that it _____. a.was too similar to the British system, giving one leader too much power b.it gave the states too much power c.it did not give the states enough power d.it did not establish a

    asked by imissbobby♥
  33. science

    As you airplane taker off from an airstrip on the ground and rises 30,000 feet into the sky what happens to the air pressure on the outside of the airplane ? Answers are Air pressure decreases Air pressure increases Air pressure stays same more information

    asked by snow
  34. English 10th grade

    In "Like the Sun," all of the following would be considered "casualties" of Sekhar's truth except his • children • colleagues • headmaster • wife It almost seems it could be any of them but I need the right one.

    asked by Sandra
  35. MBA

    1- The height of adult women in the United States is normally distributed with mean 64.5 inches and standard deviation 2.4 inches. Find the probability that a randomly chosen woman is (a) Less than 63 inches tall (b) Less than 70 inches tall (c) Between 63

    asked by Bunkym
  36. Trigonometry

    find sin2x, cos2x, and tan2x if sinx= -2/sqrt 5 and x terminates in quadrant III

    asked by Elena
  37. ****HELP**** STATISTIC

    The table below shows the probability distribution of the types of food purchased by students from the school cafeteria. What is the probability a student has purchased Caesar salad? (2 points) 0.17 Suppose houses are available for purchase during

    asked by Tikima
  38. physics!!!!!

    A bucket of mass 1.80kg is whirled in a vertical circle of radius 1.55m . At the lowest point of its motion the tension in the rope supporting the bucket is 28.0N. A-find the speed of the bucket. B-How fast must the bucket move at the top of the circle so

    asked by Eayvom
  39. Enghish Identify pronoun errors

    1)No one is expressing their opinion. A)reference B)case C)agreement 2)They say we will not be able to afford to own houses in a few years. A)reference B)case C)agreement 3)The pronoun those is an interrogative pronoun used with singular nouns .True/False

    asked by Mary
  40. Physics

    Help me understand this please You have a 2.00 kg block of lead. Lead melts at 327.5°C. CPb = 130.0 , and Hf for lead is 2.04 × 10^4 J/kg. Say you start at room temperature (25.0°C). How much heat must you transfer to melt all the lead?

    asked by Me and I
  41. Chemistry

    10.1g of potassium nitrate were dissolved in 50cm^3 of water. the temperature fell by 16 degrees celsius. Determine (a) the number of moles of potassium nitrate dissolve in 50cm^3 of water. (b) heat change that would be produced if one mole of potassium

    asked by Jessica
  42. Chemistry

    The equilibrium constant for the reaction of the weak base aniline is Kb = 4.3e-10. C6H5NH2 (aq) + H2O (l) --> C6H5NH3+ (aq) + OH- (aq). Calculate ΔG at 298 K when [C6H5NH2] = 0.250 M, [C6H5NH3+] = 1.0E-5 M, [OH-] = 0.000480 M i used the equations dG=dG^o

    asked by Brianna
  43. Chemistry - Science

    A 6.70 g sample of a binary mixture of silver (I) nitrate and sodium nitrate is completely dissolved in water to make a solution. Aqueous barium chloride is then added to this solution in excess to form 3.60 g of silver chloride solid. What is the percent

    asked by Anonymous
  44. SEKGOSESE

    2 forces of 5N and 7N respectively act on an object.a)When will the resultant of two vectors at a maximum?b)when will the resultant of the two vectors be at a minimum?c)What are the maximum and minimum resultants of the two forces?d)Draw a diagram to show

    asked by COSMOS
  45. Enghish Identify pronoun errors

    Identify the type of pronoun error in the sentence. 1 Neither of we boys was going to the ball game. A)reference B)case C)agreement 2)The papers are on the desk that I corrected. A)reference B)case C)agreement 3)The traffic pattern on the new road is

    asked by Mary
  46. chemistry help

    what is lead (II) acetate + hydrogen sulphide --> Pb(C2H3O2)2 + H2S --> how do i figure it out?

    asked by sunny
  47. physics

    A car entering the freeway accelerates from 10.2 m/s with a constant acceleration of 4.4 m/s2. What is the car’s final velocity when it merges onto the highway and reaches its cruising speed 4.2 seconds later? A 28.7 m/s B 11.2 m/s C 18.5 m/s D 8.28 m/s

    asked by Luis
  48. Math

    Use the inverse matrix to solve this system of equations: 4x+3y=7.5 7x+9z=14 4y-z=8.3 A) x = -2.125, y = 3.23, and z = 4.555 B) x = 1.661, y = 2.509, and z = 0.404 C) x = 2.509, y = 1.661, and z = -0.404 D) x = 0.260, y = 2.435, and z = 1.375 E) x = 2.435,

    asked by Anonymous
  49. Physics

    1. A car decelerates at -3.8 without skidding when coming to rest on a level road. What would be its deceleration if the road is inclined at 9.3° and the car moves uphill? (Asume the same static friction coefficient and the car is on the verge of

    asked by Laurie
  50. Pre Algebra

    what figure has 3 lateral faces that are rectangales

    asked by Steve
  51. Math

    Admission to a museum cost $12 for adults and $7 for children. A group of 35 people attending the museum paid a total of $315 in admission fee. Write a system of equations to represent the situation. Let A represent the number of adults admissions and C

    asked by Terry
  52. physics

    1 - Determine the distance to which the 90 kg painter can climb without causing the 4 m ladder to slip at its lower end A as shown in Figure 1. The top of the 15 kg ladder has a smaller roller, and at the ground the coefficient of static friction is 0.25.

    asked by zainab
  53. Physics

    When a rubber rod is rubber with wool, the rod becomes negatively charged. What can you conclude about the magnitude of the wool's charge after the rubber process? Why? Please Help!!

    asked by Anonymous
  54. geometry cumulative

    A cylinder’s radius is reduced to 2/5 its original size and the height is quadrupled. How has the volume of the cylinder changed?

    asked by Anonymous
  55. chemistry

    How do I determine how many moles of KMnO4 it takes to neutralize C2O4-?

    asked by billy
  56. U.S History - Pls check my answer!!!

    Document C Andrew Jackson’s Message to Congress, Dec 7, 1829 The condition and destiny of the Indian tribes within the limits of some of our states have become objects of much interest and importance. By persuasion and force they have been made to retire

    asked by Cassidy
  57. Geography,life sciences,history,sepedi,english,maths lit and life orientation

    Which course can i do due to the subjects i am doing when i go to the university?

    asked by Kamogelo
  58. College Gen. Chemistry - Science

    You have 120.0 mL of a 0.245 M solution of NaCl in an open beaker. After several days, you test the solution and find that it now has a concentration of 0.348 M. How much water must have evaporated from the beaker given the new concentration?

    asked by Anonymous
  59. chemistry

    Quinine is a natural product extracted from the bark of the cinchona tree, which is native to South America. Quinine is used as an antimalarial agent. When 2.50 g of quinine is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is

    asked by sam
  60. College Chemistry (DrBob222)

    A solution of an unknown weak acid, HA, is titrated with 0.100 M NaOH solution. The equivalence point is achieved when 36.12 mL of NaOH have been added. After the equivalence point is reached, 18.06 mL of 0.100 M HCl are added to the solution and the pH at

    asked by Anonymous
  61. discrete mths

    Two dice, one red and one white are rolled. What is the probability that the white die turns up a smaller number than the red die ?

    asked by Anonymous
  62. calcules

    A company wishes to run a utility cable from point A on the shore to an installation at point B on the island. The island is 6 miles from the shore. It please explain it for me step by step without link it to a similar question: costs $400 per mile to run

    asked by jasmine
  63. Trigonometry

    Suppose that (5/13,y) is a point in Quadrant IV lying on the unit circle. Find y. Write the exact value not a decimal approximation

    asked by Madison
  64. Physics

    In Stranger in a Strange Land, Robert Heinlein claims that travelers to Mars spent 258 days on the journey out, the same for return, \plus 455 days waiting at Mars while the planets crawled back into positions for the return orbit." Show that travelers

    asked by anonymous
  65. math

    Sandra makes a pizza she puts mushrooms on 2/8 of the pizza she adds green peppers to 5/8 of the pizza which topping covers more of the pizza

    asked by Angie
  66. physics

    a spaceship is moving at 1000 m/s release a satellite of mass 1000 kg at a speed of 10 000 m/s. what is the mass of the spaceship if it slows down to a velocity of 910 m/s?

    asked by abdul aziz
  67. College Chemistry (DrBob222)

    You have 120.0 mL of a 0.245 M solution of NaCl in an open beaker. After several days, you test the solution and find that it now has a concentration of 0.348 M. How much water must have evaporated from the beaker given the new concentration?

    asked by Anonymous
  68. Chemistry

    Calcium can also be precipitated out of the solution by adding sodium phosphate (Na3PO4) to form solid calcium phosphate. A.) write a net ionic equation for this process B.)calculate the mass of this precipitate you would generate from treating 1.000 L of

    asked by Mai
  69. physic

    A box of mass 2 Kg lies on a rough horizontal floor with the coefficient of friction between the floor and the box being 0.5 (Figure 3). A light string is attached to the box in order to pull the box across the floor. If the tension in the string is TN,

    asked by zainab
  70. Healthcare Finance

    you are considering starting a walk in clinic. Your financial projections are as follows: revenues $400,000, wages and benefits 220000, rent $5,000., depreciation $30,000., utilities $2,500., medical supplies $50,000. and administrative costs $10,000.

    asked by Kelly
  71. grammar

    "We shall not see him again" change into Past simple.

    asked by fathima
  72. Algebra

    Graph the solution to the inequality on the number line |4u-8|=>12

    asked by David
  73. Physics

    A 150g piece of copper is heated to 100oC. It is then held in the open air for 2 minutes and 31 seconds, and then dropped into a 100g copper calorimeter containing 200g of water at 17oC. If the rate of loss of heat of the copper piece while held in the air

    asked by Mike
  74. CHEM

    Can you show me the formula I need to do this problem. please a solution is made by dissolving 0.35 mole of LiI in enough water to give a final volume of 2.60 ml. What is the molarity of the solution? thank you

    asked by julia
  75. Calculus

    Find a positive number such that the sum of the square of the number and its reciprocal is a minimum.

    asked by Q
  76. math

    Eric has a two rocks samples. One has a mass of 600 grams and the other has a mass of 1 kilogram. He recorded the total mass as 7 kilogrmaas. Explain what he did wrong? What should be the correct answer in grams?

    asked by Math
  77. English

    How do you pronounce "Dacha" in Russian? A dacha is a Russian country house.

    asked by rfvv
  78. GENETIC HYPOTHESIS

    AIM:TO DETERMINE THE NUMBER OF GR.10-12 THAT CAN ROLL THEIR TONGUE(rollers) AT SCHOOL. 1)fomulate a hypothesis. MY ANSWER:GR.11 HAS M0RE LEARNERS THAT CAN ROLL THEIR TONGUE (is it correct and any tips to master ths)

    asked by EMIHlE
  79. Science

    Ricco mixed up 500 cc of salt solution. He weighed it and found it's mass to be 585 g. Will his shake up toy work the way he wants it to if he uses this salt solution? Why or why not? Remember, 1 ml= 1 cc show your math

    asked by Mia
  80. math

    the new highway will be a total of 54 miles long. will the highway be finishe in 8 months

    asked by angie tran
  81. algebra

    an open-topped box can be made from a rectangular sheet of aluminum, with dimensions 40 cm by 25 cm, by cutting equal-sized squares from the four corners and folding up the sides. Declare your variables and write a function to calculate the volume of a box

    asked by rosaline
  82. english

    Identify the number of independent and subordinate clauses in the following group of words. If you could come in on Sunday, that would be great

    asked by marie
  83. Math

    A 3-foot piece of wood is cut into two equal sections. How long is each section in inches? a. 9 inches b. 18 inches c. 27 inches d. 36 inches

    asked by Anonymous
  84. chemistry

    The rate constant of a first-order reaction is 4.25 x 10^-4 s^-1 at 350 Celsius. If the activation energy is 103 kJ/mol, calculate the temperature at which its rate constant is 8.75 x 10^-4 s^-1.

    asked by santoki
  85. chemistry

    enzoic acid is a weak monoprotic acid with Ka = 6.5×10-5 M. NaOH(s) was gradually added to 1.00 L of 8.66×10-2 M benzoic acid. 1. Calculate the pH of the solution before the addition of the base. 2. Calculate the pH of the solution after the addition of

    asked by bekah
  86. math

    Sally made an initial deposit into an account bearing an interest rate of 7% compounded continuously. How long will it take for Sally's initial deposit to double in value?

    asked by Anonymous
  87. Physics

    A car moving at a constant speed of 50km/h turns a corner, changing it's direction from north to west. What is it's change in velocity. What was the acceleration if the then took 5s

    asked by Chu
  88. Physics

    An aluminum calorimeter has a mass of 60g and an initial temperature of 25oC. What is the final temperature attained when 86.8g of water at 90oC is poured into it?

    asked by Mike
  89. ALGEBRA

    DAmon you equaled them to zero that is not rightt An open-topped box can be made from a rectangular sheet of aluminum, an open-topped box can be made from a rectangular sheet of aluminum, with dimensions 40 cm by 25 cm, by cutting equal-sized squares from

    asked by rosaline
  90. chemistry

    Question Part Points Submissions Used A swimming pool, 20.0 m ✕ 12.5 m, is filled with water to a depth of 3.85 m. If the initial temperature of the water is 18.9°C, how much heat must be added to the water to raise its temperature to 28.7°C? Assume

    asked by D
  91. Day of the Butterfly by Alice Munro - time???

    what year is the book, "Day of the Butterfly" by Alice Munro set in? pls help asap! thanx in advance

    asked by TTR+S<3
  92. math

    Harriet spent $4050 on other supplies for her aviary. She spent $326 less on litter than she did on perches, and twice as much on nesting boxes as litter and perches combined. How much did she spend on perches?

    asked by Maye
  93. Chemistry

    I don't really understand how to do this problem, or where to start exactly. Can someone explain to me where to start and how I can solve the problem in a step by step process? Thank you in advance! 1. An acetic acid / sodium acetate buffer solution is

    asked by Aaron
  94. chemistry

    Based on your titration of the 150ppm standard solution of Ca2+ calculate the molarity of the EDTA solution we used, which is Ca2+ + EDTA4- ----> [CA(EDTA)]2-

    asked by Mai
  95. calculus

    Recall that the volume of a sphere of radius r is V(r) =4\, \pi\, r^3 /3. Find L, the linearisation of V(r) at r=50

    asked by MEMO
  96. physics

    Determine the distance to which the 90 kg painter can climb without causing the 4 m ladder to slip at its lower end A as shown in Figure 1. The top of the 15 kg ladder has a smaller roller, and at the ground the coefficient of static friction is 0.25. The

    asked by zainab
  97. Physics

    A series RCL circuit contains only a capacitor (C=6.60 F), an inductor (L=7.20 mH), and a generator (peak voltage=32.0 V, frequency=1.50x10^3 Hz). When t  0 s, the instantaneous value of the voltage is zero, and it rises to a maximum one-quarter of a

    asked by Anonymous
  98. physics 1

    When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 88.1-kg man just before contact with the ground has a speed of 3.53 m/s. (a)

    asked by Anonymous
  99. chemistry

    what is the chemical & word equation of sulfur dioxide + water i don't understand this, can someone please explain to me how to do this!!?

    asked by ann
  100. math

    an open-topped box can be made from a rectangular sheet of aluminum, with dimensions 40 cm by 25 cm, by cutting equal-sized squares from the four corners and folding up the sides. Declare your variables and write a function to calculate the volume of a box

    asked by Anonymous
  101. math

    Which type of graph would best display the numbers of each type of vehicle sold by a large dealership during a year? A. bar graph B. circle graph C. line graph D. line plot

    asked by joe
  102. Math

    Find the radius of a circle so that it's area and circumference have the same value.

    asked by Anonymous
  103. Trigonometry

    rewrite tan(sin^-14v) as an algebraic expression in v

    asked by Alex
  104. PreCalculus

    The cost C (in dollars) of manufacturing x wheels at Deon's Bicycle Supply is given by the function C(x)= 0.1x^2-60x+22,744. What is the minimum cost of manufacturing wheels? Do not round your answer.

    asked by Jane
  105. Mathematics lit, physical science, life science. Geography and englsh ,sepedi and l.o

    What career m i qualify for it ?and where? And hw much m i g0ing to earn?? N how long it wil take me to learn??

    asked by Johannes
  106. world history

    how did Japan consolidate its hold over its people during the interwar period?

    asked by Anonymous
  107. How-To Essay Evaluation (Writeacher)

    What do you think? "In order to shoot a bow accurately, the first step to take is to determine your dominant eye (the eye from which a person prefers to receive visual input). While this action might have been what you least expected, by determining your

    asked by Anonymous
  108. Chemistry

    What volume in liters will be required to dissolve 60.9 grams of Mg(OH)2? Ksp = 1.8×10-11 After doing the math, i got 1.58e-4, but its not right, so i have no idea what to do now.

    asked by Brianna
  109. French

    What is the difference between "rue" and "roue" in pronunciation?

    asked by Anonymous
  110. College Gen.Chemistry

    A student wanted to determine the amount of copper in a sample of copper ore. The student dissolved a 2.500 ± 0.001 g piece of copper ore in about 75 mL of nitric acid; then, a complexing agent was added. The student transferred this solution to a

    asked by Anonymous
  111. Chemistry

    if the pressure read by the barometer is 0.882atm, what is the height of the column of mercury in cm?

    asked by Benny
  112. Chemistry 2

    What is the solubility of silver chromate in pure water

    asked by Joe
  113. Chemistry - Science (Dr. Bob222)

    A student wanted to determine the amount of copper in a sample of copper ore. The student dissolved a 2.500 ± 0.001 g piece of copper ore in about 75 mL of nitric acid; then, a complexing agent was added. The student transferred this solution to a

    asked by Anonymous
  114. Physics

    When a rubber rod is rubber with wool, the rod becomes negatively charged. What can you conclude about the magnitude of the wool's charge after the rubber process? Why? Please Help!!

    asked by Anonymous
  115. chemistry

    how many moles of H2O are produced when 5.00 mols of oxygen gas are used

    asked by karla
  116. Human Resources

    Contrast the arguments concerning union membership that are likely to be presented by a union with those likely to be presented by an employer.

    asked by Melissa Haywood
  117. chemical

    wavelength .989 nm strikes a surface the emitted electron has a kinetic energy of .969eu

    asked by kinte
  118. history

    Which of the following is true of the Industrial Workers of the World (I.W.W.)? A. It was founded in Russia. B. It made business leaders create new methods to deal with labor issues. C. It had very little influence over the labor movement. D. It was

    asked by Sarah
  119. Chemistry

    The concentration of Ca2+ in a particular water supply is 5.7×10−3M. The concentration of bicarbonate ion, HCO−3, in the same water is 1.7×10−3M. What masses of Ca(OH)2 and Na2CO3 must be added to 5.6×107L of this water to reduce the level of Ca2+

    asked by Rebecca
  120. Socials quick question

    when was the champlain and saint lawrence railroad built? My guess is 1836 but I don't think that's right.

    asked by Rk
  121. math

    Suppose 48,000 is invested at an interest rate of 4.2%, compounded quarterly. What will the account be in 10 years?

    asked by Anonymous
  122. Science asap thankies :)

    What would a permanently magnetic substance be called? I cant remember what my teacher called it, it was a short first word then magnet.. sorry and thanks!

    asked by imissbobby♥
  123. chemistry

    please help! how do i find the molecular mass of C3H5O2 molecular mass of 292 g.

    asked by joshua
  124. Physics

    Add the vectors 1. 6.0m N and 4.0 NE 2. 6.0m N25E and 4.0 E

    asked by Chi
  125. accounting

    Liz Marett is the chief financial officer for Fulton Restaurants. She delivered the following comments in a recent conference call with analysts that follow the company: "20X5 was another excellent year. Net income was a record setting $10,000,000. Food

    asked by Holly
  126. math

    2 trains leave the station at 325 one going east at 66 miles per hour the second going west at 82 miles per hour they are 111 miles apart what time is it

    asked by nick
  127. education

    Teacher observations are vital to the promotion and maintenance of children's health status because: A. they provide a baseline of typical behavior and appearance of each child. B. teachers have primary responsibility for children's health care while they

    asked by nate
  128. Convert fraction decimal and percent

    On Friday math test. will missed 5 problems out of 25. If each problem was equally weighted, what was will's grade on the test? A. 20% b. 75% c. 80% d. 85%

    asked by Anonymous
  129. Engineering Science

    If a helical tension spring consisting of 12 live coils of ¼ inch steel wire and of 1 ¼ inch mean diameter is attached to the end of another helical tension spring of 18 live coils of ¼ inch steel wire and of 1 ¾ inch mean diameter, calculate the

    asked by Aim Senallagam
  130. algebra 2

    Identify the form of the equation (standard, vertex, intercept), tell if it opens up or down and give the axis of symmetry. y=-4x^2+3x+-6 Walk me through this please?

    asked by jamie
  131. science

    what would happen to the impedance of a series circuit containing an inductor, capacitor and resistor if the supply frequency is varied from 0 to infinity Hz

    asked by Andy
  132. Geometry B

    The equation x2 + y2 − 2x + 2y − 1 = 0 is the general form of the equation of a circle. What is the standard form of the equation?

    asked by Anonymous
  133. Physics

    An object with a mass of 5 kg moves at a constant velocity when it is pulled by a horizontal force of 5 N on a level surface. What is the acceleration of the object if the object is pulled with a force of 25 N?

    asked by Dienta
  134. grammar

    hey.. can u do 3 sentences for my homework.. put from direct to indirect speech.. 1)'I've got plan I and know we can killl the Ice-Man!' 2)'The show is minning overtime. Peter please, could you speed up?' 3)'Come on Steve, you can do it! Jump!'

    asked by Anonymous
  135. 8th grade U.S History

    Document B: Daniel Webster’s argument regarding a national bank, 1833 The argument regarding the national bank starts with the question: Does Congress have the right to charter a 'National Bank'? and can a State Legislature be forced to house a federal

    asked by Cassidy
  136. Chemistry

    What can be said about the presence of each of these groups of cations in the orginial solution

    asked by Joe
  137. Spanish 2

    Re-write the following sentences in correct Spanish and use direct and indirect object pronouns. 1.) We need to wash the car for you. 2.) We used to wash the car. 3.) Mom makes pizza. 4.) Mom makes pizza for me. 5.) I want to see a movie.(una película)

    asked by Alexis
  138. math

    Hoe do you do 450 divide14?

    asked by Paul
  139. physics

    What is the pressure that is exerted by a box tjat has a dimension of 12cm long and 14cm wide and has a force of gravity on the box of 40N?

    asked by billy
  140. Physics

    The bulk modulus of a liquid is 4.0 10^10 N/m2. Suppose a volume of 0.6 m3 of the liquid is taken from the surface where the pressure is approximately that of the atmosphere (1.00 10^5 N/m2) and is lowered into a pool of liquid to a depth where the

    asked by Please Help!!!
  141. geometry

    Find the hypotenuse of a triangle with legs length 12 cm and 14 cm. Round to the nearest tenth

    asked by keke
  142. Trigonometry

    Find all solutions to the equation tan(theta)+sqrt3=0 Write your answer in terms of pi and us the or button as necessary.

    asked by Jasmine
  143. chemistry

    How ml silver nitrate solution (0.05 mol / l) K = 1.0000 consumed for titration of sodium chloride, 0.0500 g. MW Sodium chloride 58.44.

    asked by ULIA
  144. Algebra

    1) which number(s) is/are a solution of the inequality? There can be more than one correct answer. A) -13 B) 25 C) 10 D) 33 2) which number(s) is/are a solution of the inequality? There can be more than one correct answer. A) 1 B) 2 C) 3 D) 4

    asked by Help me 2 questions
  145. english

    choose the correct one. a) I wore all of the safety equipment for skateboarding; however, I still hurt myself. b) I wore all of the safety equipment for skateboarding, however, I still hurt myself. c) I wore all of the safety equipment for skateboarding

    asked by sunny
  146. math

    Change decimals to a fraction 0.35

    asked by kalima
  147. math

    if 10 of the 50 pieces if candy are green, then what percent of the pieces of candy are green?

    asked by rose
  148. math

    P=347e^.023t, where t is the number of years after 1990. Use the model to estimate the population in the year 2012.

    asked by Anonymous
  149. math

    P=347e^.023t, where t is the number of years after 1990. According to the model, in what year will the population reach 1000?

    asked by Anonymous
  150. history

    how did Japan consolidate its hold over its people during the interwar period?

    asked by anna
  151. algebra

    How do I graph y=1-4x?

    asked by Icis
  152. Chemistry

    Mohr's indicator is 5g/100ml of K2CrO4 in water. What is the concentration of CrO4^2- in the indicator? (in mol/L)

    asked by anon.
  153. Geometry

    Find the midpoint of the segment with the given endpoints. M(–2, 1) and O(–3, 2)

    asked by Anonymous
  154. math

    So how would you isolate the variable of 3z=5? My mom is trying to help me understand it, so she gave me 15 questions, and this one I am not sure of, thank you.

    asked by imissbobby♥
  155. math

    if one rhombus measures 62 what are the remaining angle

    asked by james
  156. Pre-Calc

    How would you go about finding all the solutions of the equation. I just don't know where to start. 2cos2theta-root3=0

    asked by Anonymous
  157. English

    I can stand that much to help the environment. --------------------------- What is the part of speech of 'that much' in the sentence?

    asked by rfvv
  158. Math

    Evaluate 3X /4 if X=2

    asked by Mari
  159. math

    Graph the function f(x)=1/3-x (x≠3)

    asked by Pam
  160. physics

    this is a physics qustion im stuck on: ingrid holds the womans record time for a marathon race of 2h 21min 6s for 42.195km. The mens record is held by Blake grison of 2h 6 min 50s. If they had been in the same race how much would blake win by.. find this

    asked by Clara
  161. Algebra

    The length of a rectangle is 5 meters more than its width. The perimeter is 66 meters. Find the length and the width of the rectangle

    asked by Alex
  162. HEALTH

    Words and Definitions that go along with the std chlamydia?

    asked by Anonymous
  163. MATH

    you have a pair of newborn hamsters. each pair that is at least one month old produces a new pair every month. at this rate, you will have 178 hamsters at the end of what month? (The math relay officials said the 10th month but I think that it should be

    asked by CODY
  164. Trig Identities

    Explain why Sin of theta= -The square root of 1-cos^2 theta is not an identity, using either graphical or numerical reasoning.

    asked by Madison
  165. health

    What is the best way to lose weight and keep the weight off?

    asked by Daquan
  166. Calculus Rate of Change

    Find the average rate of change h(x)=2x^2-4 from x=2 to x=6 Simplify your answer as much as possible

    asked by Shelby
  167. Healthcare finance

    I post a question earlier- confused as to when taxes are assumed. Am I heading in the right direction when I say after profit- so my answer is 7,937.5 based on profit of 82,500. I am taking 317,5009Total costs)/40(cost per visit). Or if before profit

    asked by Kelly
  168. Algebra 2

    d(x)= (54x^10)/(24x^8 )please help

    asked by Omar
  169. grammar

    you will be winning the match. What is the tense of this sentence

    asked by fathima
  170. Math

    The three interior angles of a triangle are in a 1:3:6 ratio. Find the measure of the largest angle?

    asked by Mary
  171. geometry

    is every composition of transformations cumalitive? In other words, does the order matter? I think it depends on transformation, but I'm not sure

    asked by maya
  172. physiscs

    what is emitted by the vibrating electrons of attoms

    asked by lizeth calderon
  173. Pre Algebra

    can a trapezoiodal prism equal a triangular prism and rectangular prism combined

    asked by Steve
  174. English

    1. For here or to go? - For here. 2. Here or to go? - Here 3. Is this for here or to go? - For here. 4. Is this here or to go? - Here. (Which ones are grammatical?)

    asked by rfvv
  175. biology - genetics

    how do you compare the reversibility of point mutations and microsatellites? I thought point mutations could reverse but microsatellites can't but idk the reason.

    asked by santoki
  176. english

    i have a question say you're writing a sentence such as "I ate apples, bananas, oranges, and grapes." is there a comma before 'and' or no?

    asked by sunny