Most popular questions and responses by Marcus
  1. pre algebra with pizzazz 239

    why didn't the circus managers want their human cannonball to quit?

    asked on October 27, 2011
  2. math

    I need help asap A solid with two parallel and congruent bases cannot be which of the following. A. cone B. prism C. cylinder D. cube My answer is cube

    asked on March 23, 2019
  3. Chemistry

    Which of the following solutes in aqueous solution would be expected to exhibit the smallest freezing-point lowering (assuming ideal behavior? 0.1 m NaCl .2 m CH3COOH .05 m Al2(SO4)3 .1 m MgCl2 .25 m NH3 What would be the steps to picking the right option?

    asked on February 19, 2013
  4. Chemistry

    Cyclopropane rearranges to form propene: CH2CH2CH2 --> CH2=CHCH3 by first-order kinetics. The rate constant is k = 2.74 x 10-3 s-1. The initial concentration of cyclopropane is 0.290 M. What will be the concentration of cyclopropane after 100 seconds?

    asked on February 17, 2013
  5. chemistry

    When 50.0mL of 1.20 M of HCl (aq)is combined with 50.0mL of 1.30 M of NaOH (aq) in a coffee-cup calorimeter, the temperature of the solution increases by 8.01 Degrees C. What is the change in enthalpy for this balanced reaction? HCl(aq) + NaOH(aq)

    asked on November 14, 2012
  6. chemistry

    A 94.7 g sample of silver (s= 0.237 J/(g x Degree C)), initially at 348.25 Degrees C , is added to an insulated vessel containing 143.6 g of water (s=4.18 J/(g x Degree C)), initially at 13.97 Degrees C. At equilibrium, the finial temperature of the

    asked on November 14, 2012
  7. chemistry

    A sample of propane C3H8 contains 13.5 moles of carbon atoms how many total moles of atoms does the sample contain?

    asked on March 1, 2013
  8. chemistry

    At constant pressure and 25 degrees C, what is delta H for the reaction 2C2H6(g) + 7O2(g) --yields-- 4CO2(g) + H2O(l) if the complete consumption of 11.3 g of C2H6 releases -586.3 kJ of heat energy? (11.3=.38 mol C2H6)

    asked on November 14, 2012
  9. statistics

    Suppose babies born in a large Hospital have a mean weight of 4088 in a variance of 5569. if 128 babies are sample that a random from the hospital what is the probability that the mean weight of the sample babies would differ from the population mean by

    asked on March 17, 2016
  10. College Chemistry

    please help! You are given an unknown, colorless, solution that may contain only one salt from the following set: NaA, NaB, NaC. In solution each salt dissociates completely into the Na+ ion and the anion A-, B-, or C-, whose properties are A is green, B

    asked on November 10, 2010
  11. consumer math

    2. Use the monthly payment table and this table to answer the following questions. Loan APR Years Monthly Payment Total Payment Interest $6,700 13.5% 5 A B C $8,720 12.5% 15 D E F $20,230 11.5% 20 G H I Find A. (Points : 1) 3. Find B. (Points : 1) 4. Find

    asked on February 28, 2012
  12. geometry

    DEFG is an isosceles trapezoid. Find the measure of

    asked on October 20, 2011
  13. Language arts

    Use the excerpt to answer the question 1. Which is the best paraphrase of the lines from the poem A. We are happy when the sun is shining we feel Mary when the bells ring and we sing along the sun goes down and we have to stop playing sports. B. The sun

    asked on February 12, 2019
  14. Chemistry

    The molal boiling-point constant for water is 0.51 degrees C/molal. The boiling point of a 1.00 molal solution of Ca(NO3)2 should be increased by: A.) exactly 1.53 or B.) Somewhat less than 1.53 This is how I worked the problem: Ca(NO3)2 dislocates into 3

    asked on February 21, 2013
  15. Chemistry

    The question is: what is the ratio [NH3/[NH4+] in an ammonia/ammonium chloride buffer solution with pH= 10.00? (pKa for ammonia=9.25) When working the problem, I tried to solve it a bit backwards, in that I plugged in each of the multiple choices I was

    asked on April 9, 2013
  16. Chemistry

    A solution contains 10.0 g pentane, C5H12, 10.0 g hexane, C6H14 and 10.0 g benzene, C6H6. What is the mole fraction of hexane? I figured the equation would be: ___ M Hexane x 10 Divided by 30 =Mole fraction of Hexane?

    asked on February 10, 2013
  17. chemistry

    50.0 mL of a solution of HCl is combined with 100.0 mL of 1.15 M NaOH in a calorimeter. The reaction mixture is initially at 22.4°C and the final temperature after reaction is 31.2°C. What is the molarity of the HCl solution? You may assume that there is

    asked on February 28, 2015
  18. 7th grade

    how did some people hope to solve the problem of california's isolation from the rest of the country

    asked on March 8, 2010
  19. Physics

    You pull a sled across a horizontal frictionless patch of snow. If your pulling force is in the same direction as the sled's displacement and increases the kinetic energy of the sled by 34%, by what percentage would the sled's kinetic energy increase if

    asked on March 21, 2014
  20. Chemistry

    What is the pH of a 0.1 M NaOCl solution (Ka of HOCl is 2.95 x10-8) I did: x squared/.10= 2.95x10-8 x squared= 2.95x10-9 x= 5.43x10-5 -log(5.43x10-5)= 4.27 pH However, the options I'm given are either a.) 3.74 b.) 6.47 c.) 8.23 d.) 10.27 What steps am I

    asked on April 8, 2013
  21. Math

    An object is thrown upward from the top of a 160-foot building with an initial velocity of 144 feet per second. The height, h, of the object after t seconds is given by the equation h=-16t^2+144t+160. When will the object hit the ground? The object will

    asked on December 3, 2017
  22. Math: Geometry

    The circumference of the base of a cylinder is 16 cm. The height of the cylinder is 10cm. a. What is the surface area of the cylinder? b. What is the volume of the cylinder? Need help on this one. I have the formula but I'm a little confused because I

    asked on February 21, 2008
  23. Math

    Ben throws a ball vertically upward from the top of a cliff. The height of the ball above the base is approximated by the model h = -5t² - 5t + 100, where h is the height in metres and t is the time in seconds. a) After how many seconds does the ball hit

    asked on May 7, 2019
  24. calculus

    find dy/dx of xsiny+cos2y=cosy

    asked on December 8, 2008
  25. Chemistry

    aluminum reacts with sulfuric acid to produce aluminum sulfate and hydrogen gas. how many grams of aluminum sulfate would be formed if 250 g H2SO4 completly reacted with aluminum

    asked on February 23, 2014
  26. Chemistry

    What is the vapor pressure of a aqueous solution containing 10 % (by weight) ethylene glycol (62 g/mol) at 25 °C. PH2O = 24.3 torr at 25°C?

    asked on February 10, 2013
  27. English

    Why are the fairies singing a lullaby? A. to put their queen to sleep B. to put their babies to sleep C. to put the bird to sleep D. to show how well they sing I think the answer is B. Pls help

    asked on March 6, 2019
  28. physics

    A weightlifter has a basal metabolic rate of 80.0 W. As he is working out, his metabolic rate increases by about 650 W. (a) How many hours does it take him to work off a 450-Calorie bagel if he stays in bed all day? (b) How long does it take him if he’s

    asked on November 28, 2012
  29. Chemistry

    In a given 1st order reaction A ---> products, the initial concentration of A is 0.40 M. What will be the concentration of A after 15 seconds if the half-life of the reaction is 3 seconds? I found the concentration to be 1.25 x 10-2 M But then how do I

    asked on February 18, 2013
  30. Physics addition of velocities

    A seagull flies at a velocity of 7.00 m/s straight into the wind. (a) If it takes the bird 17.0 min to travel 6.00 km relative to the earth, what is the velocity of the wind? (b) If the bird turns around and flies with the wind, how long will he take to

    asked on October 1, 2015
  31. math

    Levinson’s Hardware has a number of bikes and tricycles for sale. There are 27 seats and 60 wheels all told. Determine how many bikes and tricycles there are in the store

    asked on June 1, 2012
  32. Chemistry

    Many portable gas heaters and grills use propane, C3H8(g). Using enthalpies of formation, calculate the quantity of heat produced when 15.0g of propane is completely combusted in air under standard conditions. Assume that liquid water is forming.

    asked on October 4, 2013
  33. Chemistry

    The decomposition of N2O5(g) --> NO2(g) + NO3(g) proceeds as a first order reaction with a half-life of 30.0 seconds at a certain temperature. If the initial concentration [N2O5]0 = 0.400 M, what is the concentration after 120 seconds?

    asked on February 17, 2013
  34. physics

    A balloon rubbed against denim gains a charge of -8.45µC. What is the electric force between the balloon and the denim when the two are separated by a distance of 4.7cm? (Assume the charges are located at a point)

    asked on February 21, 2018
  35. algebra 1

    Natalie made a mistake in the following problem. What line was the mistake made in? Show your work and give the correct answer. Line 1 6(4) ÷ 2 − 1 + 5 Line 2 6(4) ÷ 1 + 5 Line 3 24 ÷ 1 + 5 Line 4 24 + 5 Line 5 29

    asked on December 22, 2010
  36. Chemistry

    When 1.150 grams of an unknown nonelectrolyte dissolves in 10.0 grams of water, the solution freezes at -2.16°C. What is the molecular weight of the unknown compound? Kf for water = 1.86°C/m. -2.16 x m/-1.86 = 1.16 1.16/ .010 kg of water= 116 1.150/116=

    asked on February 10, 2013
  37. chemistry

    consider the following changes at constant temperature & pressure H2O(s) --yields-- H20(l); Delta H1 H2O(l) --yields-- H2O(g); Delta H2 H2O(g) --yields-- H2O(s); Delta H3 Using Hess's law, the sum of the deltas is a. equal to 0 b. sometimes greater than

    asked on November 14, 2012
  38. College Physics

    A rock is dropped from a sea cliff and the sound of it striking the ocean is heard 6.4 s later. If the speed of sound is 340 m/s, how high is the cliff?

    asked on February 2, 2010
  39. Geometry

    Two similar rectangular prisms have a scale factor of 4:1. The smaller prism has a volume of 6 cubic centimeters. What is the volume of the larger prism in cubic centimeters?

    asked on May 28, 2019
  40. Math

    A ladder is leaning against a building so that the distance from the ground to the top of the ladder is 4 feet less than the length of the ladder. Find the length of the ladder if the distance from the bottom of the ladder to the building is 8 feet.

    asked on December 3, 2017
  41. Trigonometry

    While cruising at a steady speed of 400 km/h, you identify a storm cloud straight ahead 45 km away. To avoid turbulence, you start climbing at an angle of elevation of 15°. If you maintain this speed and direction for 6 min, how far will you be from the

    asked on June 13, 2019
  42. physics

    1) A balloon rubbed against denim gains a charge of -8.45µC. What is the electric force between the balloon and the denim when the two are separated by a distance of 4.7cm? (Assume the charges are located at a point) 2)Two identical conducting spheres are

    asked on February 21, 2018
  43. science

    What happen to the water in the basin when you placed a drop of water?

    asked on December 7, 2017
  44. Chemistry

    Which of the following pure liquids is the best solvent for sodium fluoride? CCl4 C2C6 HCl BCl3 or PCl5 My guess would be either CCl4 or C2C6, I need to know the reasoning behind the correct answer.

    asked on February 19, 2013
  45. Chemistry

    What mass of water must be used to dissolve 20.0 grams of ethanol, C2H5OH, to prepare a 0.0500 molal solution of ethanol?

    asked on February 10, 2013
  46. Chemistry

    What is the molality of an aqueous solution that is 10.0% ethanol, C2H5OH, by mass?

    asked on February 10, 2013
  47. Civics

    In 2002, one U.S. dollar could be exchanged for 133 Japanese yen, and in 2011, a U.S. dollar was worth 77 yen. Based on this information, which statement is true? Demand for the yen increased between 2002 and 2011, and demand for U.S. the dollar decreased.

    asked on October 4, 2018
  48. Physics

    A projectile with a mass of 2.50 kg is shot horizontally from a height of 15.0 m above a flat surface. The projectile's initial speed is 22 m/s. 1.How much mechanical energy does the projectile have initially ? 2.How much work is done on the projectile by

    asked on December 13, 2015
  49. chemistry

    Please calculate the solubility of calcium sulfate in 0.010 mol/L calcium nitrate at SATP. This very question has been bugging me all weekend. Can some one please solve this quesiton it would really be appreciated.

    asked on March 30, 2008
  50. calculating statistical data

    the same supervisor in #9 agreed to increase the salary of the employee to 13.00 per hour once she passed her RHIT exam. three months after beginning her employment, the employee passed her RHIY exam. what will the new budget be for salary and fringe

    asked on July 23, 2014
  51. calculating statistical data

    the him coding supervisor over the coding section agrees to pay a new graduate 11.00 per hour. this a full time coding position at 2080 hours per year. the cost for a full time employee's fringe benefits is 24 percent of the employee's salary. how much

    asked on July 23, 2014
  52. Chemistry

    Which of the following result in buffered solutions when equal volumes of the two solutions are mixed? a.) .1 M HCl and .1 M NH4Cl b) .1 M HCl and .1 M NH3 c.) .2 HCl and .1 M NH3 d.) .1 M HCl and .2 M NH3 By def. I know that a buffed solution is made from

    asked on April 9, 2013
  53. chemsitry

    home / study / questions and answers / science / chemistry / make sure to answer both parts: 1)balance the following ... Your question has been posted. We'll notify you when a Chegg Expert has answered. Post another question. . Question Edit question make

    asked on September 29, 2015
  54. physics

    Three forces A (30N at 35 degrees NE), B (40N at 25 degrees SW) and C (50N at SE) all act on one original point. Find the magnitude and direction measured from the positive x-axis of a fourth force F required to keep the body in equilibrium.

    asked on November 7, 2017
  55. Chemistry

    The decomposition of ozone may occur through the two-step mechanism shown below: step 1 O3 ----> O2 + O step 2 O3 + O ---> 2O2 The oxygen atom is considered to be: a catalyst or reaction intermediate? How am I supposed to be able to tell the difference

    asked on February 19, 2013
  56. Chemistry

    An ideal monatomic gas initially at 298 K and 1 atm pressure is expanded from a volume of 1 liter to 2 liters. Consider separately isobaric, isothermal and adiabatic expansions to accomplish this. In each case, calculate the following: a) The final

    asked on January 30, 2011
  57. math

    Write a real world problem that you can solve by writing an equation . The answer to the problem must be 6

    asked on September 20, 2010
  58. chemistry

    My chem book gives me the following Hess' Law example: Mg + 2HCl --> H2 MgCl2 Delta H1 MgO +2HCl --> H2O +MgCl2 Delta H2 H2 + 1/2 O2 --> H2O Delta H3=-68.3kcal The desired reaction is the formation reaction of MgO as follows: MgS +1/2 O2 --> MgO Delta H

    asked on December 6, 2012
  59. geometry

    How many hours will it take a bicyclist traveling 17.6 feet per second to finish a 90-mile race? Round your answer, if necessary, to the nearest tenth.

    asked on June 7, 2011
  60. Chemistry

    Which of the following solutes, dissolved in 1000g of water, would provide a solution would the lowest freezing point? .030 mol of BaCl2, CO(NH2)2, CaSO4, CH3COOH, or .030 mol of NH4NO3 Again, the steps needed to determine for the freezing point.

    asked on February 19, 2013
  61. social studies

    what effect did california's rapid population growth have on californios and native americans

    asked on March 8, 2010
  62. calculating statistical data

    what is the percent of variance for each item listed in the him department budget shown in the table below? round to two decimal points.

    asked on July 23, 2014
  63. Math

    gerald had a gross pay last wk of $980.00, If his total deductions were 161.35, what was his net pay?

    asked on May 27, 2012
  64. computer science

    write a program that asks the user to enter today's sales rounded to the nearest $100 for each of three stores. the program should then display a bar graph comparing each store's sales. create each bar in the graph by displaying a row of astericks. each

    asked on April 5, 2010
  65. calculating statistical data

    the him department at the community hospital will experience a 15 percent increase in the number of discharges coded per day as the result of opening a cardiac clinic in the facility. the 15 percent increase in projected to be 100 additional records per

    asked on July 23, 2014
  66. physics

    Consider a toy car that you pullback to make it go forward. Is it a force multiplier or a distance multiplier? Defend your answer with the observations you could make

    asked on March 24, 2014
  67. Chemistry

    The indicator bromocresol green (HIn) can be in two different forms: As HIn the color of the indicator is yellow, an In the color of the indicator is blue, and an equilmolar mixture of the two species is green. The Ka of the indicator is 2.5 x 10-5. What

    asked on April 7, 2013
  68. calculus

    Use an appropriate local linear approximation to estimate the value of Cotangent 46 degrees.

    asked on April 14, 2010
  69. math

    Solve the problem. Round to the nearest tenth, if necessary. A rock falls from a tower that is 432 feet high. As it is falling, its height is given by the formula h = 432 - 16t2. How many seconds will it take for the rock to hit the ground (h=0)?

    asked on March 21, 2009
  70. Science

    Electrical energy is required to decompose water into hydrogen and oxygen. True or False

    asked on January 29, 2018
  71. calculating statistical data

    all the patients who present to the emergency service department with a suspected acute myocardial infraction (AMI) are expected to receive an EKG within 10 minutes if their arrival. of the 56 patients who had a suspected AMI during the last quarter, 32

    asked on July 23, 2014
  72. calculating statistical data

    the forms used in your coding area cost 100.00 per 1000 forms for the first 2000 and $50 for every 1000 thereafter. if you need to order 5000 forms what is the total cost?

    asked on July 23, 2014
  73. calculating statistical data

    of the 5352, requests for medical records in the question above, 4257 were located within the 20 minute time frame established by the supervisor as a quality improvement indicator. what is the rate of compliance in anawering requests for records? round to

    asked on July 23, 2014
  74. Chemistry

    Another proposed mechanism problem: H2O2 + I ---> H2O +IO slow H2O2 + IO ---> H2O + O2 + I fast Which of the following statements in incorrect? a.) IO is a catalyst b.) I is a catalyst c.) The net reaction is 2H2O2 ---> 2H2O + O2 I would choose B, since IO

    asked on February 19, 2013
  75. wordd

    Compare and contrast your abilities as an academic writer now as opposed to when you began your studies at college using four comparatives and four superlatives within your responses, explain what has led to these changes

    asked on November 19, 2010
  76. Math

    I am sorry I didn't complete the problem Here is the question: Doris invested some money at 7% and some money at 8%. She invested $6,000 more at 8% than she did at 7%. Her yearly total from the two investments was $7.80. How much did Doris invest at each

    asked on July 1, 2014
  77. Chemistry

    To illustrate the calculation, assume that 21.95 mL of a thiosulfate solution is required to reduce the iodine liberated by 20.85 mL of 0.0200M KIO3 and that 18.63 mL of the same thiosulfate solution reacts with the iodine replaced by 20.00 mL of an

    asked on April 26, 2013
  78. Chemistry

    2A + B2 + C --> A2B + BC Run # Initial Rate (M-1s-1) (A)o (B)o (C)o 1 1.6 x 106 1.2 M 1. x 10-2 M 1.0 M 2 1.6 x 106 2.4 M 1. x 10-2 M 1.0 M 3 3.2 x 106 1.2 M 2. x 10-2 M 1.0 M 4 6.4 x 106 1.2 M 1. x 10-2 M 2.0 M What would be the rate-law expression of the

    asked on February 17, 2013
  79. science

    How many gallons of fossil fuel to make a gallon of each of the following? synfuel soy ethanol cellulosic electricity

    asked on April 10, 2011
  80. Chemistry

    Ethanol is a fuel that can be made from corn. How many kJ of heat energy are released when 3.00 kg of ethanol are burned? C2H5OH(l) + 3O2(g) ¨ 2CO2(g) + 3H2O(g) H = -1406.8 kJ/mol

    asked on April 17, 2010
  81. chemistry

    the specific heat capacity of mercury is 0.033 cal/(g))degrees Celsius)How many grams of Hg could be raised to 50 degrees celsius from 27 degrees celsius with 381 joules?

    asked on April 16, 2009
  82. calculating statistical data

    it takes approximately 15 minutes to code one record. How many personnel hours would be needed to code 1424 discharges for the month?

    asked on July 23, 2014
  83. College Physics

    A proton is put on the positive Y axis a large distance (100km) from the origin. What is the minimum speed required in the - Y direction so the proton will just reach the point (0,20) cm?

    asked on March 3, 2013
  84. 5th grade

    Ginny has a pumpkin with a mass of 4.8kilograms. If .9 of its mass is water, how much of its mass is water? How much is not water?

    asked on December 6, 2010
  85. Physics

    A 67.0 kg base runner begins his slide into second base when moving at a speed of 3.5 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. How much mechanical energy is

    asked on November 14, 2010
  86. math.....need help

    Solve the problem. An open box is to be made from a rectangular piece of tin by cutting two inch squares out of the corners and folding up the sides. The volume of the box will be 100 cubic inches. Find the dimensions of the rectangular piece of tin.

    asked on March 21, 2009
  87. Kaplan University

    The Linear equation y=6x-5 graphs as a horizontal/vertical/diagonal line ( choose the correct label and type it below)

    asked on February 19, 2008
  88. Cardiovascular Respirtory

    A patient complains of a fast heart rate. Which diagnosis does this statement indicate? A. Arrhythmia B. Infarct C. Ischemia D. Tachycardia

    asked on December 17, 2014
  89. chemistery lab..urgent

    hi..can someone hwlp me out here on how we can calculate the moles of H2T(phthalic acid)?? its urgent for my lab this evening 1:00pm friday

    asked on September 18, 2014
  90. calculating statistical data

    you currently lease scanning equipment at a cost of 1500 per quarter and two copy machine at $120 each per month. what will you need to budget annually for this leased equipment?

    asked on July 23, 2014
  91. calculating statistical data

    a coding supervisor must determine the number of full time equivalents (FTES) needed to code 500 discharges per week. if it takes an average of 20 minutes to code each record and each coder works 7.5 productive hours per day, how many FTES will the coding

    asked on July 23, 2014
  92. Physics

    A running track consists of two straight 88.5m segments and two semicircles of radius 39.0m The distance a runner travels in one complete lap I calculated to be 422 m. How do you find the displacement in x.y of a runner who covers half a lap?

    asked on February 4, 2014
  93. physics

    A proton is put on the positive Y axis a large distance (100km) from the origin. What is the minimum speed required in the - Y direction so the proton will just reach the point (0,20) cm?

    asked on March 3, 2013
  94. Chemistry

    In a given 1st order reaction A ---> products, the initial concentration of A is 0.40 M. What will be the concentration of A after 15 seconds if the half-life of the reaction is 3 seconds?

    asked on February 17, 2013
  95. Math

    You have 2/3 bag of flour. Use 3/4 of the flour to make cookie dough. How much of the entire bag do you use to make cookie dough?

    asked on December 17, 2012
  96. precalculus

    When asked to sketch the graph of g(x)= -e^(x+1) +1, how do I turn this equation into exponential form? Or can I? I always get confused on what to do especially when I need to the x part of the equation out of the exponent.

    asked on November 21, 2012
  97. precalculus

    My book tells me to solve each exponential equation. I am given a lot of problems such as 6^x+1 = 4^2x-1 where I use In in the problem to help get my answer. However, in the same section, the book starts giving me problems such as 3(2)^x-2 +1=100 and

    asked on November 21, 2012
  98. healthcare management

    Write a 1,400- to 1,750-word paper on essential communication in a community crisis situation described in the scenario. Include the following in your paper: • The individuals or groups that will be communicating inside and outside the organization

    asked on July 26, 2012
  99. math

    Use algebra pieces and mental arithmetic to determine four consecutive odd numbers who sum is 64. Sketch and label your algebra piece model and explain how you solved the problem.

    asked on June 2, 2012
  100. Algebra

    The linear equation y=0.15x+0.79 represents an estimate of the average cost of gas for year x starting in 1997. the year 1997 would be represented by x=1, for example, as it is the first year in the study. similarly, 2005 would be year 9, or x=9 A) what

    asked on January 6, 2012


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