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

    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
  3. 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
  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. 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
  6. 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
  7. Mathematics

    The bearing of point A from another point B is 135degrees . What is the bearing of B from A

    asked on July 21, 2020
  8. 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
  9. 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
  10. 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
  11. math

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

    asked on October 1, 2019
  12. 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
  13. 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
  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. 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
  16. 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
  17. Physics

    Romeo takes a uniform 15.0-m ladder and leans it against the smooth (frictionless) wall of the Capulet residence. The ladder's mass is 20.2 kg and the bottom rests on the ground 3.07 m from the wall. When Romeo, whose mass is 70 kg, gets 93.2 percent of

    asked on February 19, 2012
  18. 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
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. Social Studies (Help!)

    Why did New France stretch so far to the west?

    asked on December 7, 2015
  27. 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
  28. 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
  29. Statistics

    a machine fills containers with a standard deviation of filling weights of 1.5. calculate the mean weight if only 4 % of the containers hold less than 19 ounces

    asked on November 16, 2011
  30. 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
  31. 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
  32. 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
  33. psychology

    Why is reinforcement generally preferable to punishment in promoting behavior modification?

    asked on July 7, 2010
  34. 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
  35. 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
  36. chemistry

    whata the period block and group in which elements with the following electron configuration is located? a) [Ne] 3s^23p^4 b) [Kr] 4d^105s^25p^2 c) [Xe] 4f^145d^106s^26p^5

    asked on May 20, 2008
  37. 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
  38. 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
  39. Socials

    What evidence is there to support John A. Macdonald’s argument that BC would be better off joining the United States if the transcontinental railway was not built?

    asked on May 16, 2018
  40. chemistry

    25cm cubed of 0.250mol per litre of potasium carbonate was nuetralized 12.5cm cubed of ethanoic acid of unknown concentration.determine concentration of the acid

    asked on January 11, 2017
  41. 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
  42. Social Studies (Help!)

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

    asked on December 1, 2015
  43. chemistry

    How many moles are their in 10.6 L os SO2 ?

    asked on April 20, 2015
  44. physics

    Part 1/2 A cyclist maintains a constant velocity of 7 m/s headed away from point A. At the.aome.initial time, the cyclist is 240 m from the point A. What will be his displacement from starting point after 65 s ? Answer in units m Part 2/2 Qhat will be his

    asked on September 13, 2014
  45. math help plzzz

    Solve the inequality then graph the solution set on real number line. (2/5x)>7 2(x+7)-4>5(x-3)

    asked on May 27, 2014
  46. chemistry

    was the formation of reactants or products favored by the addition of heat?

    asked on February 18, 2014
  47. Math

    How would you use a number line to round 148 to the nearest ten.Explain.

    asked on September 29, 2013
  48. 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
  49. 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
  50. math

    If a bar code contains a letter followed by a digit from 1 to 9 followed by another letter how many different codes are possible?

    asked on October 23, 2012
  51. 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
  52. English

    Select the sentence in which all pronouns are used correctly. A. I sat between him and her during the sales conference. B. Just between you and I, I am not impressed by our new manager. C. Be sure to divide all income from the suburban property between he

    asked on September 18, 2012
  53. english

    In the following sentence, what is the subject complement? My neighbor is a newspaper reporter.

    asked on September 12, 2012
  54. Discrete Math

    Statements P->Q, ~R->(S->T), R v(P v T), and ~R are true. What is the truth value for the statement, (Q v S)?

    asked on August 1, 2012
  55. earth

    how long does it take for light from Jupiter to come to earth. for example tonight the planet Jupiter can be seen by the moon, 2/25/12 and we see the light from the planet and how old is that light. thanks. jerry in colorado USA

    asked on February 26, 2012
  56. Physics

    A comet is traveling towards the earth. The comet has a mass of 5.50E+12 kg and a radius of 323 m. The comet is traveling with a speed of 13.5 km/s and spinning with a period of 0.15 seconds when its center is a distance 2.28E+7 m away from the center of

    asked on October 31, 2011
  57. 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
  58. 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
  59. 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
  60. 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
  61. 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
  62. 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
  63. algebra

    Help! g/r+g - g/r-g

    asked on February 28, 2010
  64. 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
  65. 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
  66. statistics

    Four research participants take a test of manual dexterity (high scores mean better dexterity) and an anxiety test(high scores mean more anxiety) The scores are as follows.

    asked on July 18, 2009
  67. math

    1)what equation represents a line that is perpendicular to the line whose equation is -2y=3x+7? 2)if the measures of the angles of a triangle are reprsented by 2x, 3x-15, and 7x+15, is the triangle an acute triangle?

    asked on April 7, 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
  69. 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
  70. 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
  71. math

    I need to know how to calculate what percentage of a number is to another. let me make that clearer, 35 is what percent of 48? how is that calculated? What you are asking is this: 35 is to 45 as x is to 100 or 35/48=x/100 solve for x x=.729 Now to get %

    asked on August 21, 2005
  72. Counseling

    I am in grade 10 doing this subject what work can i qualify doing this subjects Math lit,Geography,Business Studies,Tourism

    asked on January 24, 2020
  73. Social studies

    Which of the following could be a modern-day example of cultural diffusion into the region of Southwest Asia A. requiring strict adherence B. Women pursuing careers outside the home C. wearing the hijab in public D.observing traditional religious practices

    asked on December 2, 2019
  74. 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
  75. biology

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

    asked on May 17, 2019
  76. 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
  77. 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
  78. 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
  79. 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
  80. 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
  81. 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
  82. English

    Write a few lines of dialogue between the emotions gratitude and anticipation. Make sure every line matches the emotion.

    asked on May 30, 2018
  83. 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
  84. 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
  85. 7th Grade Math

    What value(s) can x have if x = |7|? Explain.

    asked on September 12, 2017
  86. Math 6th Grade

    Bob is planting in a rectangular container. In the center of the container he places a smaller rectangular tub with mint. The tub is 8 in. by 3 in. He plants flowers around the tub. What is the area of the container planted with flowers? The whole

    asked on May 30, 2017
  87. 6th Grade Math (Please Help It's Getting Late)

    Roger visted a ski and snowboard shop the other day to buy a new snowboard. The store said it was having a sale, today only. 20% off all new 2016 Burton Snowboards. Usually these snowboards cost $300 when they're not on sale. Roger told his friend John

    asked on April 26, 2017
  88. programming

    Design a sub-class of SimpleCalculator called Calculator using psudoecode that contains public methods named multiply(), and divide() and that defines private fields called num1 and num2. Each of the methods accepts two numeric arguments and returns a

    asked on April 9, 2017
  89. programming

    Design a sub-class of SimpleCalculator called Calculator using psudoecode that contains public methods named multiply(), and divide() and that defines private fields called num1 and num2. Each of the methods accepts two numeric arguments and returns a

    asked on April 9, 2017
  90. Math

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

    asked on January 5, 2017
  91. science

    Why the solution of aluminium sulphate in water is not clear

    asked on January 1, 2017
  92. 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
  93. 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
  94. Stat & Prob.

    Show that if Cov(X,Y)=0, then the correlation coefficient satisfies p(X+Y, X-Y)=Var(X)-Var(Y)/ Var(X)+Var (Y)

    asked on December 1, 2016
  95. Physics

    Which are in static equilibrium? 1. A box sliding down a ramp. 2. A baseball after being hit. 3. A box sliding along a horizontal surface. 4. A perfectly upright freely spinning top 5. A freely swinging simple pendulum 6. A spinning astronaut floating out

    asked on October 30, 2016

    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
  97. algebra

    How would you enter the equation y + x2 = -1 into your calculator in order to graph it?

    asked on June 14, 2016
  98. Math

    What is 9 minus 3 decided by 1third plus 1 equals

    asked on May 21, 2016
  99. Biology - Help!

    Based on your knowledge of eukaryotic gene regulation, what series of events would explain the generation of the "pre-activated" state for the full set of B-globin like genes (epsilon, gamma, delta, and beta) in the earliest embryo?

    asked on May 9, 2016
  100. Physics

    Car A travelling at 13 m/s [N] is 190m behind car B which is travelling at 9.0 m/s [N]. At this moment car A starts to accelerate at 6.0 m/s^2 [N] to catch up with car B. After 1.0s, car B also starts to accelerate at 2 m/s^2 [N]. How long will it take car

    asked on January 23, 2016


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