Most popular questions and responses by jerry
  1. chemistry

    Which of the following reactions have a positive ΔSrxn? Check all that apply. A(g) +B(g) -----> 3C(g) A(g)+ B(g)------> C(g) 2A (g) +2B (g)-----> 3C(g) A(s)+B(s)------> C(g) I picked the first one and it marked me wrong. Please help(:

    asked on March 14, 2012
  2. Chemistry

    When the oxide of generic metal M is heated at 25.0 °C, only a negligible amount of M is produced. O2M(s) ----> M(s) +O2(g) delta G= 288.9 Kj/mol When this reaction is coupled to the conversion of graphite to carbon dioxide, it becomes spontaneous. What

    asked on March 14, 2012
  3. Chemistry

    A critical reaction in the production of energy to do work or drive chemical reactions in biological systems is the hydrolysis of adenosine triphosphate, ATP, to adenosine diphosphate, ADP, as described by ATP(aq) +H2O (l) --->ADP(aq) +HPO4^2- for which

    asked on March 14, 2012
  4. Chemistry

    Write a molecular equation for the precipitation reaction that occurs (if any) when the following solutions are mixed. If no reaction occurs, write NOREACTION. Are my answers below correct? I used the textbook 1. sodium chloride and lead (II) acetate

    asked on October 5, 2010
  5. Chemistry

    HCl(aq)+Li2CO3(aq)→ Express your answer as a chemical equation. Identify all of the phases in your answer. Enter noreaction if no precipitate is formed.

    asked on July 1, 2018
  6. Math - Business Calc.

    Chocolate Box Company is going to make open-topped boxes out of 5 × 17-inch rectangles of cardboard by cutting squares out of the corners and folding up the sides. What is the largest volume box it can make this way? (Round your answer to the nearest

    asked on June 4, 2014
  7. Math

    Each triangle is a 30-60-90 triangle, and the hypotenuse of one triangle is the longer leg of an adjacent triangle. The hypotenuse of the largest triangle is 8 centimeters. What is the number of centimeters in the length of the longer leg of the smallest

    asked on December 29, 2015
  8. CHEM

    Consider the reaction, 3 NO2(g) + H2O(l) ® 2 HNO3(aq) + NO(g), where DH = – 137 kJ. How many kilojoules are released when 92.3 g of NO2 reacts?

    asked on March 21, 2012
  9. English

    What is your opinion of the idea that the dangers we face may lie beyond our understanding? I just need some idea's, please help me out. I'm not that good at writing essays.

    asked on May 6, 2014
  10. singapore math

    Kim, Mei and yante collect stamps. Kim and Mei have 220 stamps more than Yanti. Yanti and Mei have 140 stamps more than Kim. Kim and Yanti have 500 stamps. How many stamps does Mei have?

    asked on August 2, 2017
  11. chemistry

    how many half-lives of radon-222 have passed in 11.46 days?

    asked on May 23, 2011
  12. Physics

    Baseball player A bunts the ball by hitting it in such a way that it acquires an initial velocity of 1.3 m/s parallel to the ground. Upon contact with the bat, the ball is 1 m above the ground. Payer B wishes to duplicate this bunt, in so far as he also

    asked on September 20, 2010
  13. Social Studies (Help!)

    Why did New France stretch so far to the west?

    asked on December 7, 2015
  14. Social Studies (Help!)

    Why did the English want to hide their colony from Spaniards? Please help!!!!

    asked on December 1, 2015
  15. Chemistry

    When heated, lithium reacts with nitrogen to form lithium nitride: 6Li+N2 --> 2Li3N What is the theoretical yield of Li3N in grams when 12.4 g of Li is heated with 33.9g of N2

    asked on June 12, 2010
  16. english

    Help please. 26. Write a paragraph that answers the questions below. Include at least two supporting details or examples. In “the literature of the Americas,” Kimberly Koza writes; “By discovering the literature of our neighbors, we may also learn

    asked on September 17, 2017
  17. math

    Tim Tele received a $380 discount loan to purchase a DVD player. The loan was offered at 18% for 60 days. Find the interest in dollars and the proceeds for the following problem.

    asked on March 22, 2016
  18. Math

    A flowerbed is 3 3/4 meters long and 2 meters wide. Uncle James wants to build a border around the flowerbed. The width of the border is 1/2 meter. The cost of building the border is $20 per square meter. How much does Uncle James have to pay to have the

    asked on November 16, 2015
  19. chemistry

    A 0.03 mol sample of NH4NO3(s) is placed in a 1 L evacuated flask, which is then sealed and heated. The NH4NO3(s) decomposes completely according to the balanced equation above. The total pressure in the flask measured at 400 K is closest to which of the

    asked on January 8, 2009
  20. Math

    Assume that it costs Apple approximately C(x) = 36,100 + 100x + 0.01x^2 dollars to manufacture x 30-gigabyte video iPods in a day. How many iPods should be manufactured in order to minimize average cost? What is the resulting average cost of an iPod? (Give

    asked on June 4, 2014
  21. chemistry

    What mass in kilograms of E85(d = 0.758g/mL) can be contained in a 11.5gal tank?

    asked on September 8, 2012
  22. college physics

    A 0.50-kg block slides along a small track with elevated ends and a flat central part. The flat part has a length L = 1.85 m. The curved portions of the track are frictionless, but for the flat part the coefficient of kinetic friction is 0.103. The block

    asked on March 25, 2012
  23. physics

    How long will it take a 1920 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?

    asked on October 12, 2009
  24. Stats

    Suppose the time it takes for a purchasing agent to complete an online ordering process is normally distributed with a mean of 8 minutes and a standard deviation of 2 minutes. Suppose a random sample of 25 ordering processes is selected. The standard

    asked on November 13, 2011
  25. physics

    a positive point charge q sits at the center of a hollow spherical shell. The shell, with radius R and negligible thickness, has net charge -2q. find an expression for the for the electric field strength (a) inside the sphere, rR. in what direction does

    asked on September 16, 2009
  26. Chemistry

    At a certain temperature, the Kp for the decomposition of H2S is 0.832 H2S (g) H2 (g) + S (g) Initially, only H2S is present at a pressue of 0.121 atm in a closed container. what is the total pressure in the container at equilibrium? Please tell me how to

    asked on March 9, 2012
  27. chemistry

    the density of an aqueous solution containing 10.0% by mass ethanol is 0.984 g/ml. calculate molality and molarity. what volume of the solution would contain 1.15 g ethanol ?

    asked on May 4, 2016
  28. Chemistry

    An unknown compound contans only C, H, and O. Combustion of 5.70 g of this compound produced 11.4g of CO2 and 4.66g of H2O. What is the empirical formula of the unknown compound? CHO

    asked on September 18, 2011
  29. 12th grade chemistry

    A piece of iron wire weighs 2.225g. It is dissolved in acid, which oxidizes the iron to iron(II), and made up to 250 mL. A 25mL sample required 31.0 mL of a 0.0185mol/L solution of potassium dichromate. Calculate the percentage of iron in the wire.

    asked on November 10, 2008
  30. math

    A conical funnel has a base diameter of 4 cm and a height of 5 cm

    asked on May 1, 2013
  31. healthcare stats

    You currently lease scanning equipment at a cost of $2,750 per quarter and two copy machines at $150 each per month plus $0.01 per page copied. You estimate you will copy a total of 30,000 pages a year per copier. What will you need to budget annually for

    asked on November 8, 2016
  32. stat

    couple plans to have four children what is the probability that three are girls and one is a boy

    asked on January 26, 2014
  33. AP Calculus

    a)Approximate root 26 by using the linearization of y= root x at the point (25,5) Show the computation that leads to your conclusion. b)Approximate cube root of 26 by using an appropriate linearization. Show the computation that leads to your conclusion.

    asked on December 16, 2010
  34. Chemistry

    For the reaction: H2(g) + I2(g) 2HI(g) , Kc = 12.3 at some temperature T. If [H2] = [I2] = [HI] = 3.21 x 10-3 M at this temperature, which one of the following statements is true? 1. ) Not enough information is given to answer the question. 2. ) The

    asked on October 25, 2009
  35. Math

    The Lifetimes of a certain brand of photographic light are normally distributed with the mean of 210 h and a standard deviation of 50 h. What percent of lights will need to be replaced within 233 h? Out of 2000 lights, how many will have a lifetime between

    asked on June 9, 2011
  36. chemistry

    I did a lab in chemistry in which 15-mL jumbo Beral pipets with acetone was heated in boiling water until all of the liquid evaporated. Then the pipets were placed into room temperature water so that the evaporated liquid turns into condensed vapor. The

    asked on September 24, 2008
  37. Psychics

    A drag racing car starting from a standstill can reach a speed of 320 km/h in 6.50s by exerting an average horizontal force of 1.52x10^4 N on the pavement. If friction equals 5.2x10^3 N, what is the mass of the car?

    asked on October 29, 2018
  38. biology

    Hi, I wonder what are therapeutic antibodies? What are they used for?

    asked on May 17, 2019
  39. Chemistry

    how many grams of F are in 335 g of CaF2?

    asked on September 18, 2011
  40. physics

    experiencing a constant horizontal 1.10 m/s wind, a hot air balloon ascends from the launch site at a constant vertical speed of 2.70 m/s. at a height of 202 m, the balloonist maintains constant altitude for 10.3 s before releasing a small sandbag. how far

    asked on December 8, 2016
  41. Math

    Solve the optimization problem. Minimize F = x^2 + y^2 with x + 2y = 15. Thank You for the help!!

    asked on June 4, 2014
  42. Chemistry

    Complete combustion of 8.00 g of hydrocarbon produced 26.0g of CO2 and 7.99g of H2O. What is the empirical formula for the hydrocarbon?

    asked on September 18, 2011
  43. math

    lisa rolls a number cube two times. the first time she gets a 3. list all the possible outcomes of lisa's two rolls.

    asked on May 16, 2012
  44. Calculus

    A baseball, hit 3 feet above the ground, leaves the bat at an angle of 45' and is caught by an outfielder 3 feet above the ground and 300 feet from home plate. What is the intitial speed of the ball, and how high does it rise? So far i have got a few

    asked on August 26, 2010
  45. physics

    a horizontal force of 95 N is applied to 60 kg crate on rough , level surface. if crate accelerates at 1.20 m/s2 , what is magnitude of the force of kinetic friction acting on the crate?

    asked on February 28, 2010

    a 75kg parent and a 22kg child meet at the center of an ice rink. they place their hands together and push hard enough to slide apart. a. is the force experienced by the child more than, less than, or the same force experienced by the parent? I said they

    asked on October 11, 2016
  47. Chemistry

    Calculate the percent composition by mass of each element in Al(OH)3 Use at least 3 significant figures. %Al = %O = %H=

    asked on September 18, 2011
  48. Physics

    a driver of a car going 95.0km/h suddenly sees the lights of a barrier 35.0 m aheadd. It takes the driver 95 s before he applies the breaks, and the average acceleraion during breaking is does the car hit the barrier?

    asked on March 16, 2011
  49. College Physics

    Answer the following questions for a mass that is hanging on a spring and oscillating up and down with simple harmonic motion. Note: the oscillation is small enough that the spring stays stretched beyond its rest length the entire time. Options for each

    asked on February 19, 2012
  50. Cranes

    08/09/2005 Physics A crane is lifting a 200 pound object. The crane boom is 50 ft long. The boom forms an 85 degree angle with the horizontal. What is the torque applied to the crane boom?

    asked on October 23, 2011
  51. Math

    Consider a market where supply and demand are given by QXS = -14 + PX and QXd = 85 - 2PX. Suppose the government imposes a price floor of $38, and agrees to purchase any and all units consumers do not buy at the floor price of $38 per unit. a. Determine

    asked on September 15, 2015
  52. Physics

    In the Daytona 500 auto race, a Ford Thunderbird and a Mercedes Benz are moving side by side down a straight-away at 67.5 m/s. The driver of the Thunderbird realizes he must make a pit stop, and he smoothly slows to a stop over a distance of 250 m. He

    asked on January 23, 2015
  53. earth

    Body on surface of earth weighs 400 lb. Radius of earth is about 4000miles. If same body were placed on 4000 mile high tower, what would its weight be

    asked on January 20, 2012
  54. stastics

    For each of the following confidence intervals, indicate how much of the distribution would be placed in the cutoff region for a two-tailed test from 80%, 85% and 99%

    asked on April 8, 2013
  55. Calculus 3

    A medieval city has the shape of a square and is protected by walls with length 550 m and height 16 m. You are the commander of an attacking army and the closest you can get to the wall is 100 m. Your plan is to set fire to the city by catapulting heated

    asked on October 7, 2012
  56. Chem

    How many moles of each ion are present, per liter, in a solution that is labeled “0.221 M CaCl2 ”? CaCl2  Ca +2 + 2 Cl-

    asked on June 4, 2019
  57. math

    Jesse collected data on the colors of the coats his classmates wore one day in February. He started a circle graph. Which equation will give the angle measure of the section for black?

    asked on May 19, 2014
  58. Chemistry

    A 150g potato cools from 100 degrees Celsius to 50 degrees Celsius. If the specific heat capacity of the potato is 2000 j/kg degrees Celsius, how much heat does the potato lose?

    asked on September 18, 2012
  59. chem

    For a mixture of 12.0mL of 0.004. M AgNO3 and 8.0mL of 0.0025 M K2CrO4, a colorimetric measurement of CrO4-2 in the equilibrium supernatant liquid found its concentration to be 1.5*10^-4 M. Calculate the Ksp of Ag2CrO4.

    asked on July 9, 2012
  60. Math

    100 students were asked whether they are taking psychology or biology. 61 were taking pyschology, 18 were taking both and 12 were taking neither. how many were taking biology?

    asked on September 25, 2011
  61. Alegebra

    Working alone it takes Jerry 9 hrs to mop a warehouse. Ruth can mop the same warehouse in 10 hrs. If they worked together how long would it take them?

    asked on December 17, 2009
  62. Physics: electricity

    A 20g mass with charge q=+8C hangs from a spring of stiffness k=50N/m. If an infinite plane with charge density sigma=+3C/m^2 is placed d=5cm below the masses original position, through what distance does the mass on the spring deflect in meters? Ignore

    asked on February 5, 2019
  63. Math

    Write a real world problem for the equation 3+x=8

    asked on January 5, 2017
  64. Physics: electricity

    A \(m=20\,\mathrm{g}\) mass with charge \(q=+8\,\mathrm{\mu C}\) hangs from a spring of stiffness \(k=50\,\mathrm{N/m}\). If an infinite plane with charge density \(\sigma=+3\,\mathrm{\mu C/m^2}\) is placed \(d=5\,\mathrm{cm}\) below the masses original

    asked on February 5, 2019
  65. math

    Karen and Wayne need to buy a refrigerator because theirs just broke. Unfortunately, their savings account is depleted, and they will need to borrow money in order to buy a new one. Sears offers them an installment loan at 13% (add-on rate). If the

    asked on February 22, 2014
  66. Chemistry

    For the following reaction at a certain temperature: 2( ) 2( ) ( ) 2 H F HF g g g +  it is found that the equilibrium concentrations in a 5.00 L rigid container are [H2]=0.0500 M, [F2]=0.0100 M, and [HF]=0.400 M. If 0.200 mol F2 is added to this

    asked on April 3, 2013
  67. Math

    Fred decides that 12+40=62 is NOT a true equation.Is Fred correct?Explain.

    asked on October 2, 2013
  68. statistics

    What is your conclusion based on the following data? A survey was conducted to study the effects of weight loss from a low fat diet. Two random samples of 100 people each were selected. One group was put on the low fat diet and the other group on the

    asked on June 22, 2013
  69. Chemistry

    What is the empirical formula of a compund composed of 3.25% hydrogen(H), 19.36% carbon(C) and 77.39% oxygen(O) by mass?

    asked on September 18, 2011
  70. Chemistry

    I conducted the synthesis of an Alum experiment in my lab last week and I'm working on my report. I'm almost done expect I don't know how one could increase the yield of the product (alum crystal)? And also what is the point of adding sulfuric acid? Can

    asked on March 9, 2010
  71. statistics

    Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24- hour cycle of sleeping and walking- even if they are not exposed to the usual pattern

    asked on July 18, 2009
  72. Chemistry

    2. The reaction can be described in words as follows: aluminum sulfate reacted with ammonium hydroxide forming the insoluble product or precipitate, aluminum hydroxide and the water-soluble ammonium sulfate. The chemical equation can be written as follows

    asked on June 24, 2018
  73. Math

    For safety reasons, the angle between a ladder and the ground should be between 65° and 80. A ladder that is 5 m long is placed so that it reaches a window on the top floor of a house. If the foot of the ladder is 1.5 m from the house, is the ladder safe?

    asked on February 22, 2018
  74. Calculus II

    A spherical tank with radius of 5 feet is set on a coloumn 15 feet above the ground. How much work is required to fill the tank with water if the solution is pumped from ground level?

    asked on October 10, 2012
  75. Reaction Descriptions

    Complete the table below: Enter all letters containing appropriate descriptions for each of the equations below. a. precipitation reaction b. neutralization reaction c. oxidation reduction reaction d. molecular equation e. complete (total) ionic equation

    asked on January 12, 2011
  76. Project Management

    How does the project audit differ from the performance measurement control system?

    asked on April 15, 2010
  77. hstory

    ?what was signed in 1215,required the king to follow the same laws as other english people?

    asked on December 4, 2008
  78. Chemistry

    2. The reaction can be described in words as follows: aluminum sulfate reacted with ammonium hydroxide forming the insoluble product or precipitate, aluminum hydroxide and the water-soluble ammonium sulfate. The chemical equation can be written as follows

    asked on June 24, 2018
  79. algebra 1

    The base of a triangle is 3 cm greater than the height. The area is 27 cm squared. Find the height and base of the triangle.

    asked on December 15, 2016
  80. Algebra

    Boris is driving to Memphis. Suppose that the distance to his destination (in miles) is a linear function of his total driving time (in minutes). Boris has 58 miles to his destination after 21 minutes of driving, and he has 42.6 miles to his destination

    asked on September 11, 2016
  81. chemistry

    How many moles are their in 10.6 L os SO2 ?

    asked on April 20, 2015
  82. Finance

    Firm A has $10,000 in assets entirely financed with equity. Firm B also has $10,000 in assets, but these assets are financed by $5,000 in debt (with a 10 percent rate of interest) and $5,000 in equity. Both firms sell 10,000 units of output at $2.50 per

    asked on February 20, 2012
  83. physical science

    An electric current heats a 225 g copper wire from 20.0 °C to 40.0 °C. How much heat was generated by the electric current? (ccopper = 0.093 cal/gm-deg)

    asked on July 16, 2010
  84. algebra

    a new parking lothas spaces for 450 cars. the ratio of spaces for fullsized cars to compact cars is 11 to 4. how many spaces are for full-sized cars? how many spaces for compact cars?

    asked on December 12, 2007
  85. Math

    If it takes a old and hot tap 6 mins to fill a bath and on their own it takes the hot tap 100 secs more than the cold tap to fill bath. How long will it take the cold tap on its own to ill the bath

    asked on November 8, 2015
  86. Physics

    Tom the cat is chasing Jerry the mouse across a table surface 2.4 m off the floor. Jerry steps out of the way at the last second, and Tom slides off the edge of the table at a speed of 4.8 m/s. Where will Tom strike the floor? The acceleration of

    asked on November 10, 2013
  87. Computer Science

    Suppose X is a random variable and Y = aX + b is a linear function of X. Show that the correlation of X and Y is -1 if a < 0. cor(X,Y) = cov(X,V)/ sqrt(var(X)*var(Y))

    asked on October 28, 2013
  88. Physics

    There are two particles (1 and 2) that are moving around in space. The force that particle 2 exerts on 1 is given by: F21(t)=Fx*e^−(t/T)i^ + Fy*sin(2πt/T) j^ Where the parameters have the values: Fx = 13.4 N Fy = -84.2 N T = 74 s tf = 140.46 s Find the

    asked on November 6, 2011
  89. Chemistry

    A compound is 54.52% C, 9.15% H, and 36.32% O by mass. What is the empirical formula? The molecular mass of the compound is 132 amu. What is the molecular formula?

    asked on September 18, 2011
  90. Chemistry

    A 1.009-g mixture of the solid salts Na2SO4 (molar mass=142.04g/mol) and Pb(NO3)2 (molar mass=331.20g/mol). The precipitate was filtered and dried, and it mass was determined to be 0.471 g. The limiting reactant was determined to be Na2SO4. a. write the

    asked on June 14, 2010
  91. Language Arts

    Need to create a poster describing the persuasive technique bandwagon. How do I do it?

    asked on January 20, 2010
  92. chemistry

    What is an example of a specific mixture that could be separated with simple distillation and a specific mixture for which only fractional distillation would be used? I think a methanol-water mixture could be done with simple distillation, since they have

    asked on June 6, 2009
  93. physics 2

    a metallic object is given a positive charge by induction, does the mass change (increase, decrease, same)? what if given a negative charge instead? I think protons has more mass so mass increases and the opposite is true for electrons. Am I right?

    asked on February 3, 2008
  94. Electrochemistry

    A current of 2.50 A is passed through a solution containing Cu+2 ions for 4.00 hours. Calculate the mass of Cu atoms that form at the cathode. Charge= current*time Convert the charge in coulombs to number of electrons. Since it takes two electrons per Cu+2

    asked on May 17, 2007
  95. English grammar

    Please correct my english grammar. Dear sir, Good day, I just want to confirm from you if it is true the rampant rumors regarding the company.I just heard from this rumors mostly from company staff that it is already being purchased by other company. I'm

    asked on August 5, 2018
  96. Math

    a shop has one pound bags of peanuts for $2.00 and three-pound bags of peanuts for $5.50 if you buy 5 bags and spend $17, how many of each size bad did you buy?

    asked on September 29, 2015
  97. math

    Jim spoke on the phone with all his friends last weekend.On Saturday he spoke for 3/8 of an hour and on Sunday he spoke for half an hour. During that time spent, he spoke to liam for 1/8 of an hour .What fraction of the time Jim spent talking with his

    asked on January 13, 2013
  98. speech writing

    Which has a subject complement? A) The day ended with many surprises B) We can't leave without seeing her. C) The nurse felt my pulse D) I felt much better

    asked on August 12, 2012
  99. statistics

    According to the Smart magazine, 70% of smokers started smoking before the age of 18. Suppose 10 smokers are randomly selected and the number of smokers who started to smoke before the age of 18 is recorded. a) explain why this is binomial experiment. b)

    asked on February 7, 2011
  100. Physics

    A rectangle has a length of 2d and a height of d. Each of the following three charges is located at a corner of the rectangle: +q1 (upper left corner), +q2 (lower right corner), and -q (lower left corner). The net electric field at the (empty) upper right

    asked on October 17, 2010


  1. 1
  2. 2
  3. 3