Popular questions and responses by jessie
  1. chemistry

    20) The ideal value of i (van't Hoff factor) for (NH4)3PO4. A) 2 B) 5 C) 4 D) 3 E) 1 I know the answer but how are problems like this figured out?

    asked on September 26, 2010
  2. chem

    The concentration of a benzene solution prepared by mixing 12.0 g C6H6 with 38.0 g CCl4 is__________ molal.

    asked on September 15, 2010
  3. chemistry

    Nitrosyl bromide decomposes according to the following equation. 2NOBr (g)(equilibrium arrow) 2NO (g) + Br2 (g) A sample of NOBr (0.64 mol) was placed in a 1.00-L flask containing no NO or Br2. At equilibrium the flask contained 0.46 mol of NOBr. How many

    asked on November 19, 2010
  4. chemistry

    What information does an equilibrium constant give about a reaction? A. It tells how long it takes the reaction to reach equilibrium. B. It tells how much energy is required for the reaction to happen. C. It tells what the rate constant of the reaction is

    asked on August 22, 2016
  5. chemistry

    the mole fraction of urea (molar mass = 60g/mole) in a solution prepared by dissolving 16g of urea in 39g of h2o

    asked on September 13, 2010
  6. chem

    What is the freezing point (°C) of a solution prepared by dissolving 11.3 g of Ca(NO3)2 (formula weight = 164 g/mol) in 115 g of water? The molal freezing point depression constant for water is 1.86 °C/m. whats wrong with my answer: molal: 0.069 moles

    asked on September 26, 2010
  7. chemistry

    What is the general form for the simplest type of acid-base reaction? A. acid + base salt + water B. acid + base base + acid C. acid + base H+ + OH- D. acid + base solid + water

    asked on September 11, 2016
  8. physics-forces

    1. a fully loaded rocket has a mass of 2.92x10^6kg. It's engines has a thrust of 3.34x10^7N a)what is the downward force of gravity of the rocket at blast off? b)what is the unbalanced force on the rocket at blast off? c)what is the accleration of the

    asked on January 6, 2014
  9. chem class

    What is the pH of an aqueous solution at 25.0 °C that contains 3.98 × 10-9 M hydroxide ion? i posted this before and i tried solving it but i get it wrong 14 = ph + - log (3.98 × 10-9) 14- 8.4 = ph 5.6 = ph but the correct answer is 8.400 what did i do

    asked on November 21, 2010
  10. english 2

    can yall check my answers? 16. identify the sentence in which the underlined pronoun is used incorrectly a. YOU'RE never going to believe what i just heard! b. have you turned in YOU'RE english paper yet?

    asked on January 8, 2019
  11. Penn Foster

    I am looking for the questions to these exams..all I keep getting are the darn answers...I want to compare my answers before I submitt anyone have the orginal questions? to these Anyone have the questions for the penn foster exams with the answers that go

    asked on March 8, 2011
  12. Chemistry-please help

    "Use a 10% w/v nitric acid solution." How to prepare 10% w/v nitric acid solution? Do I just weigh 10g of conc nitric acid (65%) and dilute to 100ml with water?

    asked on October 11, 2011
  13. Geometry

    An observer (O) is located 660 feet from a tree (T). The observer notices a hawk (H) flying at a 35° angle of elevation from his line of sight. How high is the hawk flying over the tree? tan 35= h/660 0.70020753821= h/660 0.70020753821 * 660= h

    asked on February 23, 2016
  14. chemistry

    which solution has the highest concentration of hydroxide ions? a ph=7.93 b ph=12.59 c ph=7.00 d ph=9.82 e ph=3.21 i know the answer is 7 but why is it seven? would it be different if it said hydronium ions?

    asked on December 11, 2010
  15. english

    please help me to correct my anserw below: 1. Shhhh! Be quiet! John (sleep) _____. He might hear us from the other room. 1.sleeps 2.will sleep sleeping 4.have been sleeping ans.3 2. You look great! (you, exercise) _____ at the fitness center? 1. Are

    asked on May 5, 2017
  16. Chemistry

    Balance the equation in aqueous basic solution: NO2-(aq) + Al(s) → NH3(aq) + AlO2-(aq) I know how to balance equations in acidic solutions, but I get lost doing the basic one, please help?

    asked on May 31, 2011
  17. English II

    Read the passage and answer the question that follows. Chief Joseph's Surrender Speech, October 5, 1877 by Chief Joseph Tell General Howard I know his heart. What he told me before, I have it in my heart. I am tired of fighting. Our Chiefs are killed;

    asked on May 4, 2016
  18. chem

    Which compound listed below has the greatest solubility in water? CdCO3 Cd(OH)2 CaF2 AgI ZnCO3 how can i tell which on to choose, no matter what compounds are listed?

    asked on December 11, 2010
  19. math

    John took all his money out of his savings account. He spent $50 on a radio and 3/5 of what remained on presents. Half of what was left he put back in his checking account, and the remaining $35 he donated to charity. How much money did John originally

    asked on June 26, 2010
  20. World History

    What does the fact that the Chavin and the Nazca both used underground aqueducts to transport water demonstrate about the relationship between these two groups. A) The Nazca and the Chavin both used water for certain religious rituals. B) The Nazca and the

    asked on December 30, 2015
  21. math

    A ball is dropped from a height of 18 m.On each rebound it rises 2/3 of the height from which it last fell. What distance has it travelled at the instant it strikes the ground for the 5th time?

    asked on August 25, 2017
  22. english

    Please help me to correct my answers below.let me know the correct answers. thank you 1. Justin (write) _____ his speech for the presentation now. I hope he finishes it before we meet. 1. is writing 2.will write 3.writes 4.has been writing ans.3 2. The

    asked on May 4, 2017
  23. Chem

    Which of the following statements is (or are) true? I Hydrogen bonds occur between two hydrogen atoms. II Hydrogen bonding occurs between a hydrogen atom and an oxygen atom within a molecule. III Hydrogen bonding requires a molecule containing a large

    asked on August 19, 2016
  24. English II

    Read the passage and answer the question that follows. from Gulliver's Travels, by Jonathan Swift My gentleness and good behaviour had gained so far on the emperor and his court, and indeed upon the army and people in general, that I began to conceive

    asked on March 1, 2016

    A solution is prepared by dissolving 15.0 g of NH3 in 250 g of water. The density of the resulting solution is 0.974 g/mL. The mole fraction of NH3 in the solution is __________. A) 16.8 B) 0.940 C) 0.0597 D) 0.922 E) 0.0640

    asked on September 26, 2010
  26. english

    Please help me to correct my anserw below.thank you Petroleum, or crude oil, is one of the world's (1) _____ natural resources. Plastics, synthetic fibres, and (2) _____ chemicals are produced from petroleum. It is also used to make lubricants and waxes.

    asked on April 27, 2017
  27. ap chemistry

    Which of the following statements about the pH scale is not true? A. In a pH expression, the hydronium ions, H3O+, can be abbreviated simply as H+. B. A solution with a pH of 4 has twice the [H+] of a solution with a pH of 2. C. The pH scale is based on a

    asked on September 15, 2016
  28. English II

    From the three windows, through the cracks of the old wooden shutters, came only a few scattered sunbeams which, in the midst of the obscurity, made a soft brightness that bathed surrounding objects in a diffused and tender light. Which word, if

    asked on May 9, 2016
  29. maths

    find the area of the parallelogram that has the vectors as adjacent sides u = -2i + j + 5k v = 4i - 3j - 3k a. 11 b. squareroot 26 c. 86 d. 2 squareroot 86 e. 1

    asked on August 30, 2016
  30. chem

    Under constant pressure, a system of gases is sealed in a cylinder and then allowed to expand. What can you conclude about the work associated with this change? A. Work is negative and is done to the system. B. Work is negative and is done by the system.

    asked on August 20, 2016
  31. science

    Which of the following terms are present in the rate law? A. The rate constant, the concentration of the reactants, and the order of the reactants B. The rate constant and the concentration of the reactants C. The rate constant and the temperature of the

    asked on August 20, 2016
  32. Math

    126 is the product of 7 and Victor's savings. Use the variable v to represent Victor's savings.

    asked on May 4, 2017
  33. chemistry

    What change do you expect if the value of the reaction quotient is greater than the value of the equilibrium constant? A. The rate of the forward reaction is greater than the rate of the reverse reaction. More reactant forms. B. The rate of the forward

    asked on September 12, 2016
  34. chemistry help?!

    Which properties result from minimal interactions between molecules in a gas? A. A characteristic geometric shape and limited particle motion B. A random shape, limited particle motion, and inability to be compressed C. A random shape, significant particle

    asked on August 19, 2016
  35. chemistry help?!

    Which statement correctly pairs the order of a reaction with the units for the rate constant? A. third order; s/M B. zero order; 1/(M2) C. second order; 1/(M•s) D. first order; 1/M

    asked on August 19, 2016
  36. Physics-forces

    1. Salim has a paper route. He puts his papers on a toboggan to pull them through the snow. The combined mass of the papers and the toboggan is 24kg. The coefficient of static friction between the toboggagn and the snow is 0.18. The coeefficient of kinetic

    asked on January 7, 2014
  37. Math

    Stan's Cans, Inc. expects to earn $150,000 next year after taxes on sales of $2,200,000. Stan's manufactures only one size of garbage can and is located in the small, but beautiful, town of Mount Dora, Florida. Stan sells his cans for $8 a piece and they

    asked on March 6, 2012
  38. Math

    Find the least and greatest possible original numbers: ROUNDED PLACE is Ten Thousands, ROUNDED NUMBER is 190,000. What is the Least number and the Greatest number?

    asked on July 9, 2017
  39. chem

    Knowing what information would allow you to order gas molecules according to their velocity? A. Pressure and temperature B. Volume and molecular mass C. Pressure and volume D. Temperature and molecular mass

    asked on August 20, 2016
  40. Spanish

    This is my assignment: Imagine you are babysitting your little brother. Write a total of 5 Spanish sentences using tú commands telling your little brother what to do. Write 3 sentences using regular verbs. Write 2 sentences using irregular verbs. You can

    asked on May 16, 2014
  41. Physics-forces

    1. Harry is pushing a car down a level road at 2.0m/s with a force of 243N. The total force acting on the car in the opposite direction, including road friction and air resistance, is which of the following? a) slightly more than 243N b) exactly equal to

    asked on January 6, 2014
  42. chemistry help

    How do forces determine the shape of a protein? A. The covalent bonds in the protein determine the shape of the protein. B. The protein folds into complex shapes through intermolecular forces. C. Polar parts of a protein are repelled by water. D.

    asked on August 19, 2016
  43. English II

    from "The Lady of Shalott" by Alfred, Lord Tennyson In the stormy east-wind straining, The pale-yellow woods were waning, The broad stream in his banks complaining, Heavily the low sky raining Over tower'd Camelot; Down she came and found a boat Beneath a

    asked on May 4, 2016
  44. English

    Correct the following paragraph so that it uses the right words and includes appropriate apostrophes. Tomorrow, its supposed to be hot outside, so your going to have to wear sunblock. Youre skin will be safer with brands of sunblock that offer several

    asked on March 4, 2016
  45. chemistry

    What is the number of unpaired electrons for the following compounds: Cobalt (II) chloride Copper (II) chloride Iron (II) chloride Manganese (II) chloride Nickel (II) chloride Zinc chloride I don't know how to do this

    asked on January 8, 2015
  46. statistics

    Jim Tree sells trees. The mean length of the trees purchased was 68 inches with a standard deviation of 10 inches. Jim wants to know what percent of his sales were more than 84 inches tall. He can use the standard normal distribution to help him. He asks,

    asked on March 20, 2013
  47. chem

    Calculate the solubility of magnesium hydroxide (Mg(OH)2), ksp=1.1x10^-11? i have done this problem so many times and keep getting it wrong, i know the answer is 1.4x10^-4 but how do i get there? i did an ice chart and tried doing the cube root but its

    asked on December 12, 2010
  48. College Prep

    What is the main function of an official transcript in high school? a. to reflect high school graduation credits and requirements monitor attendance and behavior c. to chart standardized test scores and class grades d. to secure state and federal

    asked on September 19, 2017
  49. chemistry

    Which of the following bases could you write an equilibrium expression for? A. Ba(OH)2 B. KOH C. NaOH D. NH3

    asked on September 11, 2016
  50. chemistry

    What is the equilibrium expression for the change when iron(II) chloride dissolves? FeCl2(s) Fe2+(aq) + 2Cl-(aq)

    asked on September 11, 2016
  51. them

    How do intermolecular forces determine the vapor pressure of a liquid? A. A nonpolar compound has a low vapor pressure because of London dispersion forces. B. A compound that can form hydrogen bonds has a low vapor pressure. C. A polar compound has a high

    asked on August 19, 2016
  52. chemistry help?!

    Which of the following terms are present in the rate law? A. The rate constant, the concentration of the reactants, and the order of the reactants B. The rate constant and the concentration of the reactants C. The rate constant and the temperature of the

    asked on August 19, 2016
  53. Chem

    During which stroke of a four-stroke internal combustion engine is the system's temperature raised because work is done to the gases? A. Compression stroke B. Power stroke C. Exhaust stroke D. Intake stroke

    asked on August 18, 2016
  54. psychics

    In wandering, a grizzly bear makes a displacement of 1586 m due west, followed by a displacement of 3289 m in a direction 30.0° north of west. What are the magnitude and the direction of the displacement needed for the bear to return to its starting

    asked on January 8, 2015
  55. Physics-forces

    1. a force of 250N is used to push a heavy box down the street. If the force of friction between the box and the street is 195N and the box has a mass of 60kg, what is the accleration of the box? 2.a force of 40N is applied to a 6kg box of books. If the

    asked on January 5, 2014
  56. physics

    A 4.5 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=13.50 N at an angle theta=30.0 degrees above the horizontal. What is the speed of the block 5.50 seconds after it starts moving?

    asked on February 10, 2011
  57. science

    When the roller coaster is at the top of the loop, why doesn’t the person fall off the roller coaster? What forces are acting on the person when the roller coaster is going round the loop? Is it gravitational force and normal force?

    asked on February 15, 2009
  58. algebra 2

    . Is there any bias in the survey question? Explain. What do think would help students pay more attention in class? i don't understand what i am supposed to answer to this

    asked on January 29, 2019
  59. chemistry

    Which of the following chemical reactions represents a neutralization reaction? A. CH4 + 2O2 CO2 + H2O B. HCl + NaOH H2O + NaCl C. NH3 + H2O NH4++ OH- D. CH3COOH + H2O CH3COO- + H3O+

    asked on September 12, 2016
  60. chemistry

    Which of the following is true about the results of a neutralization reaction? A. An acid and a base form water and salt. B. Water reacts with a base to form the hydroxide ion. C. Water reacts with an acid to form the hydronium ion. D. An acid and a base

    asked on September 11, 2016
  61. Science - Chemistry

    If the rate law of a chemical reaction is k[NH4+]2[NO2–], what is the order of the reaction? 1. The order of the reaction cannot be determined. 2. 3 3. 1 4. 2

    asked on August 18, 2016
  62. English II

    Read the following passage and answer the questions that follow: Doctor Pascal by Emile Zola In the heat of the glowing July afternoon, the room, with blinds carefully closed, was full of a great calm. From the three windows, through the cracks of the old

    asked on May 9, 2016
  63. English II

    Read the passage and answer the question that follows: Despite our best efforts as parents, we will always make mistakes in raising our children. It's inevitable. There are so many decisions to be made in any given day, week, month, or year. It's an

    asked on May 4, 2016
  64. English

    Fix the sentence by following the apostrophe rule. The books story was pretty exciting, even though its cover was not. a. The books' story was pretty exciting, even though its cover was not. b. The book's story was pretty exciting, even though it's cover

    asked on March 4, 2016
  65. Geometry

    Given a soda can with a volume of 21 and a diameter of 6, what is the volume of a cone that fits perfectly inside the soda can? (Hint: only enter numerals in the answer blank). 7 because volume of a cylinder is pi r^2 h, and a cone is 1/3 pi r^2 h, which

    asked on February 23, 2016
  66. English

    Choose the sentence that is punctuated correctly. Many people are afraid of bold futuristic inventions Why did you spend all your money on expensive trendy clothes that you'll only wear a month or so? Oh, no, Mom is watching that silly, musical comedy

    asked on May 15, 2014
  67. Chemistry II

    what is the complete & balanced equation for the following reactions & include the catalysts if any: 1. Combustion of Methane: 2. Halogenation of Cyclopentene with Br2 4. Hydrogenation of 3-methyl-1-butyne 5. Combustion of 2-methylpropene 6.

    asked on February 4, 2014
  68. Physics multiple choice

    1. The normal force is always less than or equal to force of gravity a) True b) False 2. What is the value of the normal force? (there is an image of a box with a mass of 10kg and it is sitting on a flat horizontal surface) a) 98 N [up] b) 98 N [down] c)

    asked on December 17, 2013
  69. physics

    what force is needed to accelerate at child on a sled at 1.4 meters per second square (total mass 55 kilo gram)

    asked on October 16, 2011
  70. Ap Biology

    We performed a lab that studied osmosis in potato cells. We put cylinders of potato into varying molar Sucrose solutions and after recording different types of data were able to find the osmotic and water potential of the sucrose solution and potato cells.

    asked on November 24, 2007
  71. chemistry

    In a reaction, a chemist is observing the absorbance of CoCl2(aq) as a function of time to determine the rate at which it is being consumed in a reaction. At time t=10 s, the chemist determines that the concentration of CoCl2(aq) is 0.12 M. At time t=20 s,

    asked on January 10, 2017
  72. math

    2 1/8 divided by 3 1/4= a.68/104 b.221/32 c.17/26 d.6 29/32

    asked on November 10, 2016
  73. chemistry

    Given the following solubility constants, which list arranges the solutes in order of increasing solubility? CaCO3: Ksp = 2.8 × 10-9 Ca(OH)2: Ksp = 5.5 × 10-6 CaSO4: Ksp = 9.1 × 10-6 CaF2: Ksp = 5.3 × 10-9 A. CaSO4 < Ca(OH)2 < CaCO3 < CaF2 B. CaSO4 <

    asked on September 12, 2016
  74. chemistry

    A, B, C, and D are 4 salts whose Ksp values are 9.21 × 10-8, 7.44 × 10-11, 1.07 × 10-21, and 38.65, respectively. What is the correct arrangement of their solubilities in decreasing order? A. D, A, B, C B. C, B, A, D C. A, B, D, C D. C, B, D, A

    asked on September 11, 2016
  75. chemistry

    Acetic acid is known to be a weak acid. What will happen to the acidity of the solution when sodium acetate is added to acetic acid? A. The solution will become more acidic. B. The pH will remain the same. C. The solution will become less acidic. D. The

    asked on September 11, 2016
  76. chemistry

    During a chemical reaction, if Q = K, what can be said about the reaction? A. The reaction still proceeds in both directions, but the net result is that the reactant and product concentrations do not change. B. The amount of product is always equal to the

    asked on September 11, 2016
  77. chemistry

    What is the equilibrium expression for the following acid dissociation reaction? CH3COOH + H2O CH3COO- + H3O+ A. [CH3COO-][H3O+]/[CH3COOH][H3O] B. [CH3COOH][H2O]/[CH3COO-][H3O+] C. [CH3COOH]/[CH3COO-][H3O-] D. [CH3COO-][H3O+]/[CH3COOH]

    asked on August 22, 2016
  78. Geometry

    3.In step 1, you found the volume (in cubic feet) of the main tank. If the maximum density of killer whales per cubic foot is 0.000011142, what is the maximum number of killer whales allowed in the main show tank at any given time? You must explain your

    asked on March 12, 2016
  79. English

    Fix the sentence by following the apostrophe rule. Strong childrens education is essential to the progress of any nation a. Strong childrens' education is essential to the progress of any nation. ***b. Strong children's education is essential to the

    asked on March 4, 2016
  80. Geometry

    Given a cube with a volume of 18 cm3, what is the volume of a square pyramid that can fit perfectly inside the cube? this would be 6cm^3, right? since 3√18 is 6?

    asked on February 23, 2016
  81. Biochemistry

    If the same amount of heat is added to equal masses of each of the following substances, which substance will undergo the largest temperature change? Substance Specific heat(j/gC) Al (s) 0.90 Cl2(g) 0.48 C6H6(l) 1.7 H2O (l) 4.2 NaCl(s) 0.87 temp. change =

    asked on January 22, 2016
  82. Social studies

    Four major candidates ran in the 1824 election, all under the "Democratic-Republican" name. One of the candidates, Andrew Jackson, was already famous. In the 1780s, he earned the right to practice law and served in various offices of the state government,

    asked on March 14, 2014
  83. science

    1. Scientists hypothesize that the sun formed ____. (1 point) less than a billion years ago from a cloud of gas and dust less than a million years ago from a chunk of Jupiter 2. Two of the inner planets are ____. (1 point) Venus and Saturn Mars and Venus

    asked on February 11, 2013
  84. geometry

    when two perpendicular lines intersect, do they form four congruent angles?

    asked on January 15, 2013
  85. math (algerba 1)

    express as a trinomial: (u + 3) squared please explain

    asked on January 9, 2013
  86. english

    please help me to corect grammar: Those who are always correcting with other people. They are just showing off and pretending being smart but in reality nothing to prove himself but only the words they can say. Well, uneducated people would always pretend

    asked on June 20, 2012
  87. Psyc Research Methods

    In the above study, the researchers reported the following mean femininity ratings (i.e. higher numbers indicate greater femininity): male- small meals (2.02) male- large meals (2.05) female- small meals (3.90) female- large meals (2.82) Assume that there

    asked on May 2, 2012
  88. physics

    please help me i don't know the answer. What is the mathematical relationship between frequency and wavelength for an EM wave?

    asked on January 12, 2012
  89. Physics

    A block is sent up a frictionless ramp along which an x axis extends upward. The figure below gives the kinetic energy of the block as a function of position x; the scale of the figure's vertical axis is set by Ks = 46.0 J. If the block's initial speed is

    asked on December 15, 2011
  90. Chemistry

    A sample of Argon gas at standard pressure occupies 1000 mL. At constant temperature, what volume does the gas occupy if the pressure increases to 800 mm Hg?

    asked on November 13, 2011
  91. english grammar pls help me to correct my english

    kindly pls,can you help me to have a good grammar for this word document I made for my exam below. thanks a lot. my paragraph: The most difficult task in creating word document is to compose according to what a paragraph to be use. Making words correctly

    asked on May 19, 2011
  92. marketing,,help me pls.

    please can you help the advantege of metropolitan magazin. differentiate the advantage of metropolitan magazine

    asked on March 29, 2011
  93. math

    Write the numeral in base ten 555six

    asked on June 5, 2009
  94. Statistics

    An IRS auditor randomly selects 3 tax returns from 59 returns of which 11 contain errors. What is the probability that she selects none of those containing errors? Round to four decimal places.

    asked on June 14, 2012
  95. chemistry

    write a balanced reaction for 50.92 grams of carbon disulfide,including molar masses. then calculate the moles of carbon disulfide and oxygen. now find the mass of oxygen consumed in the reastion. HELP!!!

    asked on June 24, 2008
  96. chem

    Tin and Chlorine synthesize Stannous Chloride according to a two step mechanism: Sn (s) + Cl2 (g) ⇌ SnCl2 (s) + 83.6 kcal SnCl2 (s) + Cl2 (g) ⇌ SnCl4 (l) + 46.7 kcal Determine the overall heat of reaction and write the final equation for the reaction.

    asked on March 24, 2020
  97. Algebra

    Solve 4w − 7k = 28 for k. Show your work

    asked on August 13, 2019
  98. english

    please kindly help if my answers below are coorect.thank you . Teacher: So you want to learn _____ English? 1. To Talk 2.Talking 3.Speaking 4.To Speak ans. 3 2. Student: Yes, I want to be able to speak _____. 1.Good 2.Goodly 3.Proper 4.Well ans. 4 3.

    asked on May 4, 2017
  99. Help: biology

    1. You have in front of you three vials containing a clear liquid. You are told that each vial contains one of the following carbohydrates: Fructose, Sucrose, Amylose. What experiments could you carry out to determine the composition of each vial. What

    asked on April 6, 2017
  100. chemistry

    The reaction 2 NO(g) + O2(g) --> 2 NO2(g) is important in forming smog. Under certain conditions, the rate law for a the reaction is rate = 4.0 x 10-3 1/M2*s * [NO]2* [O2] What is the rate when [NO]=0.020 M and [O2]=0.035 M? a. 5.6 x 10-2 M/s b. 9.8 x 10-5

    asked on January 10, 2017


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