Most popular questions and responses by Jerry
  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. chemistry

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

    asked on September 8, 2012
  12. 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
  13. 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
  14. 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
  15. 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
  16. chemistry

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

    asked on May 23, 2011
  17. Social Studies (Help!)

    Why did New France stretch so far to the west?

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

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

    asked on December 1, 2015
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. 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
  27. 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
  28. 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
  29. 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
  30. 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
  31. 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
  32. 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
  33. 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
  34. math

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

    asked on May 1, 2013
  35. 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
  36. 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
  37. Math

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

    asked on October 2, 2013
  38. 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
  39. 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
  40. 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
  41. 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
  42. Chemistry

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

    asked on September 18, 2011
  43. 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
  44. 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
  45. 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
  46. 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
  47. 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
  48. 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
  49. 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
  50. 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

    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
  52. 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
  53. 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
  54. biology

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

    asked on May 17, 2019
  55. 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
  56. 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
  57. 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
  58. 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
  59. Physics

    A hot-air balloon is rising straight up with a speed of 5 m/s. A ballast bag is released from rest relative to the balloon when it is 8.2 m above the ground. How much time elapses before the ballast bag hits the ground? I don't get what equations or what

    asked on September 10, 2010
  60. 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
  61. 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
  62. 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
  63. 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
  64. 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
  65. math

    why can you simplify 5(50+3) using the distributive property? why can't you simplify 5(50)+ 3 using the Distributive property?

    asked on September 5, 2012
  66. 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
  67. 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
  68. 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
  69. 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
  70. 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
  71. math

    Which table shows a function that is decreasing only over the interval (–1, ∞)?

    asked on October 1, 2019
  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. 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
  74. 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
  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. math

    A grocer gets food from three suppliers. They deliver every 5 days, 6 days and 7 days, respectively. All three came today. When will they all deliver on the same day again?

    asked on February 16, 2010
  77. chemistry

    How many moles are their in 10.6 L os SO2 ?

    asked on April 20, 2015
  78. 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
  79. 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
  80. Math

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

    asked on January 5, 2017
  81. 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
  82. 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
  83. Science

    What does copper react with when heated and what is formed as a result? (When you put copper underneath a fire, would the copper be reacting with oxygen or carbon dioxide?)

    asked on September 1, 2008
  84. 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
  85. Algebra

    Trains A and B are traveling in the same direction on parallel tracks. Train A is traveling 40 miles per hour. Train B is traveling 48 miles an hour. Train A passes a station at 10:25 pm. If train B passes the same station at 10:55 pm, at what time will

    asked on July 27, 2008
  86. 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
  87. Algebra 2

    Someone please help me. Cycle Paths, Inc. makes bicycles, tricycles, and unicycles. Last week they made 88 more bicycles then unicycles, and five times as many tricycles as unicycles. If they made 40 more bicycles then tricycles, how many unicycles did

    asked on August 23, 2015
  88. Project Management

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

    asked on April 15, 2010
  89. hstory

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

    asked on December 4, 2008
  90. 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
  91. Math

    How many 5 foot tiles are needed to completely cover a 40 foot square wall?

    asked on October 19, 2015
  92. 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
  93. 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
  94. English

    Please kindly help me to 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

    asked on August 5, 2018
  95. 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
  96. statistics

    A team of at least five volunteers will be selected from seven people who volunteer to work at a food bank. a) How many different teams are possible? b) How many different teams are possible if one of them will be the team coordinator?

    asked on December 8, 2011
  97. Language Arts

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

    asked on January 20, 2010
  98. statistics

    Do students at various colleges differ in how sociable they are? Twenty-Five students were randomly selected from each of three colleges in a particular region and were asked to report on the amount of the time they spent socializing each day with other

    asked on July 18, 2009
  99. 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

    liquid methanol, CH3OH is being prepared to be poured into a beaker of water. (THERE CAN BE MORE THAN ONE ANSWER FOR Q1-3) 1) What intermolecular forces are broken in the methanol when these substances are mixed? -hydrogen-bonding -dispersion forces

    asked on February 13, 2009


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