Popular questions and responses by Andrew
  1. Chemistry

    Problem Description: You are a workstudy for the chemistry department. Your supervisor has just asked you to prepare 500mL of 3M HCl for tomorrow's undergraduate experiment. In the stockroom explorer, you will find a cabinet called "Stock Solutions". Open

    asked on August 13, 2019
  2. physics

    A 0.500 ice puck, moving east with a speed of 6.70 , has a head-on collision with a 0.700 puck initially at rest. Assuming a perfectly elastic collision, what will be the speed of the 0.500 object after the collision? What will be the speed of the 0.700

    asked on February 2, 2012
  3. probability

    the probability of drawing a club from a deck of card is 1/4 what are the odds in favor of drawing a club from an ordinary deck of cards?

    asked on March 3, 2013
  4. AP Chemistry

    What is the equation for the standard enthalpy of formation for magnesium nitrate?

    asked on November 14, 2010
  5. biology

    A man with normal color vision marries a woman who is colorblind. What percentage of their sons would be colorblind, what percentage of their daughters would be colorblind, what percentage of their daughters would be carriers of the colorblind gene?

    asked on March 31, 2011
  6. Physics

    1) Charges of +4uC and -6uC are placed at two corners of an equilateral triangle with sides of 0.10m. At the third corner, what is the electric field magnitude created by these two charges? A]4.5 x 10e6 N/C B]3.1 x 10e6 N/C C]1.6 x 10e6 D]4.8 x 10e6 2)A

    asked on February 3, 2011
  7. Chemistry

    In the combustion of natural gas according to the equation CH4 + 2 O2 -> CO2 +2 H20, how many grams of water are formed during the combustion of 0.264 mole of CH4?

    asked on October 26, 2014
  8. Chemistry

    Calculate the pH at the halfway point and at the equivalence point for each of the following titrations. (a) 100.0 mL of 0.14 M HC7H5O2 (Ka= 6.4 multiplied by 10-5) titrated by 0.14 M NaOH halfway point equivalence point (b) 100.0 mL of 0.29 M C2H5NH2 (Kb

    asked on June 1, 2012
  9. Math

    Find the area between y=x^2 and y=1 using Calculus.

    asked on August 2, 2020
  10. Chemistry

    Calculate the heat given off when 177 g of copper cools from 155.0 c to 22.0 c. The specific heat capacity of copper is 0.385 j/g c

    asked on January 23, 2014
  11. Chemistry

    A gas mixture consists of equal masses of methane (molecular weight 16.0) and argon (atomic weight 40.0). If the partial pressure of argon is 200. torr, what is the pressure of methane, in torr?

    asked on January 22, 2017
  12. Algebra

    The first group was responsible for making 160 suits while the second group was responsible for making 25% fewer suits in the same amount of time. The first team made 10 more suits each day than the second team and finished its job 2 days before the

    asked on March 22, 2016
  13. physics

    A 8.01-nC charge is located 1.95 m from a 4.06-nC point charge. (a) Find the magnitude of the electrostatic force that one charge exerts on the other. (b) Is the force attractive or repulsive?

    asked on May 5, 2012
  14. Algebra

    Bakery has bought 250 pounds of muffin dough. They want to make waffles or muffins in half-dozen packs out of it. Half a dozen of muffins requires 1 lb of dough and a pack of waffles uses 3/4 lb of dough. It take bakers 6 minutes to make a half-dozen of

    asked on March 24, 2016
  15. Math

    1 rabbit saw 6 elephants while going to the river. Every elephant saw 2 monkeys going towards the river. Every monkey holds 1 parrot in their hands. How many animals are going towards the river?

    asked on December 27, 2017
  16. Physics

    A 1140 kg car traveling south at 24 m/s with respect to the ground collides with and attaches to a 2550 kg delivery truck traveling east at 16 m/s.

    asked on February 13, 2017
  17. Accounting

    Department S had no work in process at the beginning of the period , 18,000 units were started during the period, 2,000 units were 30% completed at the end of the period, and the following manufacturing costs were debited to the departmental work in

    asked on September 3, 2015
  18. physics

    An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm2, separated by a distance of 1.70 mm. If a 19.2-V potential difference is applied to these plates, calculate the following: (a) the electric field between the plates,

    asked on May 18, 2012
  19. Chemistry

    BrO3- + 5Br- + 6H+ 3Br2 + 3H2O If 25.0 ml of 0.200-molar BrO3- is mixed with 30.0 ml of 0.45-molar Br- solution that contains a large excess of H+, what is the amount of Br2 formed, according to the above equation? The answer is 0.00810 moles but I don't

    asked on December 16, 2008
  20. Math

    The sum of 10term of an AP is 891, find the 28th and 45th term if the common difference is 14

    asked on February 15, 2020
  21. physics

    When landing after a spectacular somersault, a 40.0 kg gymnast decelerates by pushing straight down on the mat. Calculate the force she must exert if her deceleration is 5.00 times the acceleration of gravity.

    asked on October 3, 2015
  22. Algebra

    A farmer has 20 acres to plant in wheat and barley. He has to plant at least 15 acres. Wheat costs $200 per acre to plant and barley costs $150 per acre, and the farmer has only $2400 to spend. If the estimated profit of an acre of wheat is $450 and the

    asked on March 24, 2016
  23. Chemistry

    For the reaction below, Kp = 1.16 at 800.°C. CaCO3(s) CaO(s) + CO2(g) If a 25.0-g sample of CaCO3 is put into a 10.2-L container and heated to 800.°C, what percent of the CaCO3 will react to reach equilibrium?

    asked on May 12, 2012
  24. Chemistry

    A galvanic cell is based on the following half-reactions at 25C: Ag+ + e- --> Ag H2O2 + 2H+ + 2e- ---> 2H2O (not H2O2) Predict whether E_cell is larger or smaller than E°_cell for the following case. [Ag+]= 1.0M, [H2O2]= 2.0 M, [H+]=2.0M

    asked on March 30, 2009
  25. Psychology

    China and Singapore are examples of what type of economies?

    asked on September 12, 2016
  26. Chemistry

    What volume of 3.0M Na2SO4 must be added to 25ml of 1.0M BaCl2 to produce 5.0g of BaSO4? The answer is 7.1ml but I don't get it very well. I thought I could use mole ratio of the balanced equation, but it did not work. Thanks a lot!

    asked on September 19, 2008
  27. math

    Beth Dahlke is taking a ten question multiple choice test for which each question has three answer choice only one of which is correct. Beth decides on answers by rolling a fair die and making the first answer choice if the die shows 1 or 2 the second if

    asked on November 20, 2012
  28. Allied Health

    Under HIPAA, which one of the following statements is true regarding the release of PHI by covered entities to business associates? A. Covered entities are responsible for the use of PHI made by business associates. B. Covered entities aren’t allowed to

    asked on April 20, 2009
  29. Chemistry

    Before small batteries were available, carbide lamps were used for bicycle lights. Acetylene gas, C2H2, and solid calcium hydroxide were formed by the reaction of calcium carbide, CaC2, with water. The ignition of the acetylene gas provided the light.

    asked on November 22, 2016
  30. english 1

    Which sentence from the passage best supports the conclusion that the author was influenced by Amaterasu?

    asked on January 21, 2016
  31. Economics

    In a perfect competitive market setting,which of the following would be a true statement? a)market price automatically sets itself exactly at equilibrium b)market price rarely trends toward the equilibrium value c)wage rates trend toward marginal revenue

    asked on February 24, 2015
  32. math

    An art teacher has 1 1/2 pounds of red clay and 3/4 pound of yellow clay. The teacher mixes the red clay and yellow clay together. Each student in the class needs 1/8 pound of the clay mixture to finish the assigned art project for the class. How many

    asked on November 18, 2014
  33. biology

    Can you give me a long list of smelly animals

    asked on March 20, 2014
  34. physics

    A wire of initial length L0 and radius r0 has a measured resistance of 2.5 . The wire is drawn under tensile stress to a new uniform radius of r = 0.45r0. What is the new resistance of the wire?

    asked on May 21, 2012
  35. math

    Find two numbers the exact answer is between. 3 X 567

    asked on October 5, 2011
  36. Physics

    A 1.55 m tall person lifts a 1.80 kg book off the ground so it is 1.95 m above the ground. A.) What is the potential energy of the book relative to the ground? B.) What is the potential energy of the book relative to the top of the person's head?

    asked on October 16, 2016
  37. Chemistry

    If there were two solutions- one with areagent(100% pure) mixed in water and the other solution containing the same reagent (99.9% pure) mixed in equal volume of water. How significant would the difference in concentration be between these two solutions?

    asked on March 29, 2010
  38. STAT

    You will need a binomial table for n = 20 for this problem. Suppose that a quiz consists of 20 True-False questions. A student hasn't studied for the exam and will just randomly guesses at all answers (with True and False equally likely). What is the

    asked on June 25, 2019
  39. Mathematics

    Juice is sold in a rectangular prism measuring 11 cm by 6 cm by 4 cm. A cube is built to hold the same volume. By how much does the surface area decrease? Give answer to 1 decimal place.

    asked on April 19, 2017
  40. math asap

    if a 40 m rope is cut into two pieces in the ratio 3 : 5, how long is each piece? i tried: x=one piece 3/5 = x/40 x= 3*40/5 x=120/5 x=24 is that right?

    asked on October 23, 2014
  41. Geometry

    Jason wants to walk the shortest distance to get from the parking lot to the beach. a.How far is the spot on the beach from the parking lot? b. How far will he have to walk from the parking lot to get to the refreshment stand?

    asked on February 1, 2014
  42. math

    Jacie is considering a job that offers a monthly starting salary of $3000 and guarantees her a monthly raise of $180 during her first year on the job. Find the general term of this arithmetic sequence and her monthly salary at the end of her first year/

    asked on November 9, 2011
  43. Physics

    What is the smallest radius of an unbanked (flat) track around which a bicyclist can travel if her speed is 35 km/h and the μs between tires and track is 0.35?

    asked on February 18, 2010
  44. Social Studies

    Is there another famous person named John Deere. I can only find the John Deere that invented tractors.

    asked on June 17, 2008
  45. psychology

    According to Piaget, children develop through a series of stages that: 1. lead all children to the final and most advanced stages of logical thinking. 2. are unpredictable and unique to each child. 3. are unpredictable, but nevertheless lead to the most

    asked on October 7, 2018
  46. Chemistry

    For the reaction HCl + NaOH → NaCl + H2O, how many moles of hydrochloric acid are required to produce 281.0 g of water?

    asked on October 31, 2016
  47. College Physics II

    A steel wire and a copper wire, each of diameter 2.000 mm, are joined end to end. At 48.0°C, each has an unstretched length of 2.000 m. The wires are connected between two fixed supports 4.000 m apart on a tabletop. The steel wire extends from x =

    asked on September 3, 2013
  48. marketing

    The economic environment a.of an individual country has little effect on other countries. b. refers to the application of science to convert resources to output. c. includes changes in interest rates and inflation. has little impact on an organization's

    asked on January 26, 2013
  49. physics

    An object is placed 75.0 cm from a screen. (a)Where should a converging lens of focal length 8.0 cm be placed to form an image on the screen? shorter distance __cm from the screen farther distance __cm from the screen (b)Find the magnification of the lens.

    asked on May 23, 2012
  50. Chemistry

    Consider the following reaction: 2NOCl(g) 2NO(g) + Cl2(g) Initially pure NOCl(g) is placed in a vessel at 3.00 atm. At equilibrium, 0.416% of the NOCl has decomposed. Determine the value for Kp.

    asked on May 13, 2012
  51. english

    All of the following are characteristics of humanism except?

    asked on November 21, 2011
  52. US History

    Question 1 (Multiple Choice Worth 1 points) Around the turn of the century, African Americans moving to cities in the North experienced substantially less racism than did African Americans in the South. more opportunities to become skilled workers than

    asked on March 23, 2011
  53. Statistics

    In a certain microwave oven on the high power setting, the time it takes a randomly chosen kernel of popcorn to pop is normally distributed with a mean of 140 seconds and a standard deviation of 25 seconds. What percentage of the kernels will fail to pop

    asked on May 12, 2008
  54. psychology

    The use of blind or double-blind investigators in a study is done to avoid: sampling error. sample bias. uncontrollable variables. researcher bias. random error.

    asked on October 7, 2018
  55. social studies

    Which of the following Native American cultures built connected stone homes? 1. A. the Mississippians B. the Ancestral Puebloans--------- C. the Cherokees D. the Hoyanehs 2. Drag and drop the descriptions to the correct box. Each word may be used more than

    asked on August 28, 2018
  56. Physics

    Two ice skaters, Daniel (mass 70.0kg ) and Rebecca (mass 45.0kg ), are practicing. Daniel stops to tie his shoelace and, while at rest, is struck by Rebecca, who is moving at 14.0m/s before she collides with him. After the collision, Rebecca has a velocity

    asked on October 17, 2013
  57. accounting

    Ziegler Corporation purchased 25,000 shares of common stock of the Sherman Corporation for $40 per share on January 2, 2010. Sherman Corporation had 100,000 shares of common stock outstanding during 20 I3, paid cash dividends of $120.000 during 20 I3, and

    asked on April 20, 2013
  58. chemistry

    A current of 3.78 A is passed through a Pb(NO3)2 solution for 1.40 hours. How much lead is plated out of the solution?

    asked on April 15, 2013
  59. Literature

    I'm doing a literary analysis of Mark Twain's "The Private History of a Campaign that Failed" and I'm having a hard time coming up with a good these statement... Any suggestions?

    asked on March 6, 2013
  60. math

    Three men and three women are waiting to be interviewed for jobs. If they are all selected in random order find the probability of each event. All the women will be interviewed first. No man will be interviewed until at least two women have been

    asked on November 16, 2012
  61. math

    Three men and three women are waiting to be interviewed for jobs. If they are all selected in random order find the probability of each event. All the women will be interviewed first. No man will be interviewed until at least two women have been

    asked on November 15, 2012
  62. physics

    Calculate the magnitude and direction of the Coulomb force on each of the three charges connected in series: 1st - 6 micro Coulombs (positive charge) 2nd - 1.5 micro Coulombs (positive charge) 3dr - 2 micro Coulombs (negative charge) Distance between 1st

    asked on May 21, 2012
  63. physics

    The potential difference between the accelerating plates of a TV set is about 30 kV. If the distance between the plates is 1.1 cm, find the magnitude of the uniform electric field in the region between the plates. (in N/C)

    asked on May 17, 2012
  64. physics

    Two loudspeakers are placed above and below each other and driven by the same source at a frequency of 3.70 102 Hz.An observer is in front of the speakers at point O, at the same distance from each speaker. What minimum vertical distance upward should the

    asked on May 3, 2012
  65. Chemistry

    Little confusing!! I need help PLZ!!! Two half cells in a galvanic cell consist of one iron (Fe(s)) electrode in a solution of iron (II) sulphate (FeSO4(aq)) and a silver (Ag(s)) electrode in a silver nitrate solution. a. Assume the cell is operating as a

    asked on June 17, 2011
  66. Probability

    How many different three-digit numbers can be formed using the digits 1,3,5,7 and 9 if the digits may be repeated?

    asked on June 5, 2011
  67. Math

    If you toss a pair of dice 1,000 times, how many times would you expect to get a sum of 12 as the result? 1.)about 12 times 2.)about 27 times 3.)about 36 times 4.)about 100 times The lesson doesn't show me how to work this. Whats the formula?

    asked on January 7, 2011
  68. Volume of a rectangular prism

    Hello, if the volume of a rectangular prism is LWH = 64 cubic inches, what are the dimensions of a rectangular prism with dimensions twice as long? Thank you!

    asked on March 1, 2010
  69. chemistry

    How much heat, in kilojoules, is evolved when a 3.70 kg sample of molten Cu freezes? The normal boiling point is 1357 K, and heat of fusion is 13.05 KJ/mol. 2.) How much heat must be absorbed at 1357 K to melt a bar of copper (80 * 10 * 12 cm) assume d =

    asked on February 15, 2010
  70. Physics (2)

    Consider a charged ring of radius 43.4 cm and total charge 18 nC. We are interested in the electric field a perpendicular distance z away from the center of the ring. At what distance from the center of the ring does the electric field become maximum

    asked on February 11, 2010
  71. AP Chemistry

    2K (s) + 2H2O (l) --> 2KOH (aq) + H2 (g) When 0.400 mole of potassium reacts with excess water at STP, what is the volume of hydrogen gas produced? the answer is 4.48 liters but I keep getting wrong numbers! please help! Thanks!

    asked on October 2, 2008
  72. psychology

    please explain group polarization

    asked on October 7, 2018
  73. psychology

    the use of blind or double-blind investigators in a study is done to avoid: sampling error. sample bias. uncontrollable variables. researcher bias. random error. i think it is researcher bias

    asked on October 7, 2018
  74. Math Help!!

    Find all points of the graph of y=7x^2+7x whose tangent lines are perpendicular to the line -49y=x

    asked on December 1, 2017
  75. Chem

    Sodium thiosulfate, Na2S2O3, is an important reagent for titrations. Its solutions can be standardized by titrating the iodine released when a weighed amount of potassium hydrogen iodate, KH(IO3)2 (389.912 g/mol), is allowed to react with excess potassium

    asked on October 23, 2017
  76. math

    Four friends contribute sums of money to a charitable organization in the ratio of 2:4:5:7. if the largest amount contributed is $1.40, calculate the total amount contributed used by the four people?

    asked on November 23, 2016
  77. Chemistry

    A sample of carbon monoxide was collected over water at a total pressure of 752 torr and a temperature of 15°C. What is the pressure (in torr) of the carbon monoxide?

    asked on November 21, 2016
  78. College of Medicine ;University of Malawi

    what is the ph at 25 degrees Celsius of a solution made by dissolving a 5.00 grain tablet of aspirin in 0.500 litres of water? The tablet contains 0.325g of the acid HC9H7O4. ka=3.3*10^-4mm=180.2g/l

    asked on December 3, 2015
  79. Economics

    When a monopolist increases sales by one unit a)more low priced sales caused negative marginal b)every other unit must be sold at a lower price c)gains some revenue from selling the extra unit D)loses some revenue and all of the above

    asked on February 24, 2015
  80. math

    Find the horizontal and vertical asymptotes of the curve. y = x^2+5/9x^2−44x−5 x= (smaller x-value) x= (larger x-value) y=

    asked on February 11, 2015
  81. Math

    Will Rogers spun a lasso in a vertical cycle. The diameter of the loop was 6 feet, and the loop spun 50 times each minute. If the lowest point on the rope was 6 inches above the ground, write an equation to describe the height of this point above the

    asked on December 27, 2014
  82. Science

    The flask shown here contains 10.0 ml of HCl and a few drops of phenolphthalein indicator. The buret contains 30ml of 0.130M NaOH. What Volume of NaOH is needed to reach the end point of the titration? I've used m1v1=m2v2, (x)(10.0ml HCl) = (0.130 M/L

    asked on September 28, 2014
  83. Computers

    Need help creating pseudocode for the following. Registration workers at a conference for authors of children's books have collected data about conference participants, including the number of books each author has written and the target age of their

    asked on April 8, 2014

    design a program for the following. Registration workers at a conference for authors of children's book have collected data about conference participants, including the number of book each author has written and the target age of their readers. The

    asked on April 8, 2014
  85. chemistry

    N2 + 2O2 -->2 NO2 Suppose 31.25 g of N and 44.0 G of O react A. Calculate the mass of Nitrogen Dioxide formed. B. Which reactant is the limiting reactant? C. Calculate the mass of the excess reactant left after the reaction. D. Find the % yield if 52.3 g

    asked on October 30, 2013
  86. Statistics

    True or False. Help please! Statistics' students of a class of Lyceum want to calculate the average number of chocolate pieces in a standard package of biscuits SANTAS. They choose a random sample of biscuits, measure chocolate pieces in each cookie and

    asked on July 28, 2013
  87. accounting

    Rushia Company has an available-for-sale investment in the 10%, 10-year bonds of Pear Co. The investment’s carrying value is $3,200,000 at December 31, 2010. On January 9, 2011, Rushia learns that Pear Co. has lost its primary manufacturing facility in

    asked on April 14, 2013
  88. math

    find the present value using the present value formula. Achieve $ 225,500 at 8,95% compounded continuously for 8 years, 135 days.

    asked on February 17, 2013
  89. Economics

    Consider an economy with the following aggregate demand(AD) and aggregate supply(AS) schedules. These schedules reflect the fact that, prior to the period we're examining, decisions makers entered into contracts and made choices anticipating that the price

    asked on February 22, 2012
  90. Science

    The cube root of .000216 is: A. .6 B. .06 C. 77 D. 87 I think it's B

    asked on January 24, 2012
  91. AP Chem

    For the system CO(g) + H2O(g)CO2(g) + H2(g) Kp is 1.6 at 900 K. If 0.400 atm CO(g) and 0.400 atm H2O(g) are combined in a sealed flask, what is the equilibrium partial pressure of CO2(g)?

    asked on January 23, 2011
  92. AP Chemistry

    The combustion of 1.00 mol of sucrose,C12H22,O11, evolves 5650 kJ of heat. A bomb calorimeter has a calibrated heat capacity of 1.23 kj/degree Celsius. How many grams of sucrose should be burned to raise the temperature of the calorimeter and its contents

    asked on February 15, 2010
  93. Chemistry

    Why does the reaction of 2-bromo-2-methylbutane and ethanolic solution of silver nitrate interfered by the presence of water in the sodium iodide in acetone reagent? (Substitution chemistry) Thanks for any help!!

    asked on November 16, 2008
  94. math

    How to convert -1.7 into fraction thanks

    asked on November 11, 2008
  95. chemistry

    Assume that the entire mass of an atom is concentrated in its nucleus, a sphere of a radius 1.5 x 10 to the -5 pm. If the mass of the atom is 2.39 x 10 to the -22 g, what is the density?

    asked on September 29, 2008
  96. sociology

    The U.S. Census Bureau relies on a _____ system of racial classification. genetic legal social self-definition biological i think ii is self- definition

    asked on November 18, 2018
  97. sociology

    Which of the following is something groups must do in order to function effectively? a.choose leaders b.define boundaries c.set goals d.assign tasks e.all of the above

    asked on November 18, 2018
  98. sociology

    People have formed a social group when they: a.have a purpose. b.share certain role expectations. c.attach importance to what they’re doing together. d.begin to feel special in contrast with others. e.all of the above

    asked on November 18, 2018
  99. sociology

    Segregation refers to: a.the extermination of a racial or ethnic group. b.negative attitudes toward categories of people. c.unequal treatment of individuals on the basis of their membership in a category. d.the physical separation of different groups of

    asked on November 18, 2018
  100. Science

    Energy subsidy. If you decide to have 400 calories of grass fed beef instead of 500 calories of feedlot beef about how many calories of energy inputs are you saving? Answer = 4,500 Would you calculate this by 400*10+500?

    asked on October 28, 2018


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