Most popular questions and responses by alexis
  1. Chemistry

    Predict how the entropy of the substance is affected in the following processes: a) O2 (g,200 kPa, 300k) --> O2 (g, 100, 300k) b)Br2 (l, 1 bar, 25 degree C) --> Br2 (g, 1 bar, 25 degree C) C)Fe (s, 1 bar, 250 degree C)--> Fe(s, 1 bar, 25 degree C) will

    asked on April 20, 2014
  2. Chemistry

    Calculate ΔG° for the following reaction at 298 K.? A+B --> 2D ΔH° = 775.0 kJ ΔS°=296.0 J/K C --> D ΔH° = 446.0 kJ ΔS°=-218.0 J/K A+B --> 2C ΔG° = ? kJ I know I am suppose to reverse the (C --> D) and add a coefficient of 2 to both the enthalpy

    asked on April 20, 2014
  3. Art

    PLEASE HELP!!! And if you know all the answers to the lesson that would be great!!! There's 5 questions and the last one is a picture, just to make sure we are on the Same lesson. Which statement is the best comparison of the symbolism behind Chinese in

    asked on February 16, 2016
  4. Chemistry

    Using a table of standard reduction potentials, determine the best answer to the following questions. a) Which of the following reagents would oxidize Cr to Cr3 , but not Ag to Ag ? Choices: Ca^2+, Br2, Co^2+, Ca, Br^-, or Co. b) Which of the following

    asked on May 4, 2014
  5. Chemistry

    which equation represents an oxidation-reduction reaction? 1.HCl+KOH-->KCl+H2O 2.4HCl+MnO2-->MnCl2+2H2O+Cl2 3.2HCl+CaCO3-->CaCl2+H2O+CO2 4.2HCl+FeS-->FeCl2+H2S

    asked on March 20, 2011
  6. Chemistry

    In the reaction 2H2S + 3O2 -> 2SO2 +2H2O, the oxidizing agent is 1.oxygen 2.water 3.sulfur dioxide 4.hydrogen sulfide oxygen?

    asked on March 20, 2011
  7. Math Word problem !

    Sarah works in an appliance store. She gets a commission in addition to her hourly pay. She earns a 2% commission for sales up to $4000 and a 4% commission for all sales in a month above $4000. Last month her sales were $5200. How much was her commission?

    asked on January 29, 2013
  8. Chemistry

    Hydrogen peroxide can act as either an oxidizing agent or a reducing agent, depending on the species present in solution. Write balanced half-reaction equations for each of the following: (a) H2O2(aq) acting as an oxidizing agent in an acidic solution.

    asked on April 28, 2014
  9. Math help plz?

    6. Which inequality matches the graph? The graph is -3 -2 -1 0 1 2 3 4 and there is a red line from 1 to -3 The answer is 3x + 1 _< 4 but idk why? 19. Which inequality matches the graph? -3 -2 -1 0 1 2 3 4 and it has a red line from 2 to 4 the answer is 8p

    asked on December 18, 2015
  10. Chemistry

    If delta H°rxn and delta S°rxn are both positive values, what drives the spontaneous reaction and in what direction at standard conditions? The spontaneous reaction is a)enthalpy driven to the left. b)entropy driven to the right. c)entropy driven to the

    asked on April 20, 2014
  11. Chemistry

    use the data from this table of thermodynamic properties to calculate the maximum amount of work that can be obtained from the combustion of 1.00 moles of ethane, CH3CH3(g), at 25 °C and standard conditions. on the chart is said ethane(C2H6) is -84.0. In

    asked on April 28, 2014
  12. math, I need help please answer quickly!

    A) Estimate 49% of 162 B) Use mental math to calculate 49% of 62

    asked on January 13, 2018
  13. third grade math

    How do I answer this......Write three ways to find 3x2x4.

    asked on January 13, 2011
  14. Math

    Victoria rolls a number cube numbered 1-6 three times. What is the probability that she will roll a 5 on each roll?

    asked on April 3, 2016
  15. college physics

    Arthur (mass 78 kg) and Violet (mass 31 kg) are trying to play on a seesaw. If Violet sits 3.6 m from the fulcrum, at what distance from the fulcrum should Arthur sit?

    asked on October 13, 2010
  16. Chemistry

    human blood contains dissolved carbonc acid in equilibrium with carbon dioxide and water according to the reaction: h2CO3(aq)CO2(aq)+H2O(l) explain why decreasing the concentration of Co2 will ultimately decrease the concentration of H2CO3.

    asked on March 17, 2011
  17. geography

    The Fujiwara rose to power by ____? A. making a fortune through trade B. waging war on other clans. C. having their daughters marry emperors D. defeating the Mongol invaders** Please correct me if I'm wrong.

    asked on February 5, 2019
  18. Chemistry

    A 0.170-mole quantity of CoCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Co2 ions at equilibrium? Assume the formation constant (Kf) of Co(NH3)62 is 5.0× 1031 M–6. I don't really know how to start. At first I thought about

    asked on April 14, 2014
  19. fgcu

    More than a decade ago, high levels of lead in the blood put 88% of children at risk. A concerted effort was made to remove lead from the environment. Now, suppose only 12% of children in the United States are at risk of high blood-lead levels. (a) In a

    asked on March 27, 2013
  20. MATH


    asked on March 24, 2013
  21. physics

    A 4.00 kg ball traveling North with a momentum of 11.2 kg.m/s collides with a 6.0 kg ball traveling West with a momentum of 18 kg.m/s. The two balls stick together and head off as one. What is the momentum of the combined masses? What is the velocity of

    asked on April 19, 2015
  22. 7th grade math

    Not sure how to solve this: Suppose your school is selling magazine subscriptions. Each subscription cost $20. the company pays the school half of the total sales in dollars. The school must also pay a one-time fee of $18. What is the fewest number of

    asked on October 17, 2014
  23. 7th grade Math/Science

    Can you help me with this science question: from sea level, the biosphere goes up about 9km and down about 19km. What is the thickness of the biosphere in meters? (there wasn't a formula in the workbook). Thanks

    asked on August 20, 2014
  24. Chemistry

    Which of the following processes are spontaneous? (Select all that apply.) a. average car prices increasing b. a soft-boiled egg becoming raw c. a satellite falling to Earth d. water decomposing to H2 and O2 at 298 K and 1 atm I thought it would c and

    asked on April 18, 2015
  25. Algebra

    A survey was taken of students in math classes to find out how many hours per day students spend on social media. The survey results for the first-, second-, and third-period classes are as follows: First period: 2, 4, 3, 1, 0, 2, 1, 3, 1, 4, 9, 2, 4, 3, 0

    asked on April 18, 2017
  26. Trigonometry

    A cat, sitting on top of a tree, spots a dog and a firefighter, both on flat ground below. From the cat's point of view, the dog is 10m south, at an angle of depression of 65 degrees, and the firefighter is some distance east of the tree, at an angle of

    asked on December 13, 2015
  27. 8th grade science

    I'm not sure what's the correct answer: 9)Which of these characteristics can only be attributed to a wave of red light? A)The energy of the wave travels in the same direction as the wave travels. B)The wave travels by vibrating the particles of the medium

    asked on March 7, 2016
  28. algebra 1

    1. Which of the following is equivalent to x^5y^2/xy^2 when x not= 0 and y not= 0? a. x^6y^5 b. x^5y c. x^4y d. x^4

    asked on January 18, 2018
  29. Investing ( pease help)

    Maxwell Feed & Seed is considering a project that has the following cash flow data. What is the project's IRR? Note that a project's projected IRR can be less than the WACC (and even negative), in which case it will be rejected. WACC 10.00% Year 0 1 2 3 4

    asked on July 28, 2009
  30. Math

    Sustem of equations. I have to solve the system of equations by graphing and solving. Ther are thirty-three students in the Chess Club. There are five more boys than girls in the club. Write and solve a system of equations to find the number of boys and

    asked on January 29, 2013
  31. 7th grade math (probability)

    I'm posting corrections from yesterday in addition to new ones. Still not sure how to answer #4. 2. Edwin rolls a number cube and then spins a color from a color card (red, yellow, blue, green, white). What is the probability that he will roll an even

    asked on May 6, 2015
  32. Social Studies

    7. Select one movement from the Progressive Era. Describe the movement and its impact reform on South Carolina. Provide details and examples that support how this movement changed South Carolina. I chose the civil right movement I just don't know how to

    asked on April 12, 2016
  33. Math Personal Finance

    Assume a 30-month CD purchased for pays simple interest at an annual rate of 5.5%. How much total interest does it earn? What is the balance at maturity?

    asked on June 8, 2014
  34. 7th grade math

    Can you check the following? 10. A store pays $10 for a bracelet, and the markup is 115%. A customer will also pay 5 1/2% sales tax. What will be the total cost of the bracelet to nearest cent? t = 1.15 x 10 t = $11.5 (markup price) t = $10 + 11.5 t =

    asked on January 16, 2015
  35. Consumer math

    A deposit of 4,000 at 9.5% for 270 days

    asked on April 30, 2015
  36. Science

    A hydraulic lift office chair has its seat attached to a piston with an area of 11.2 cm2 . The chair is raised by exerting force on another piston, with an area of 4.12 cm2 . If a person sitting on the chair exerts a downward force of 219 N, what force

    asked on September 29, 2012
  37. Chemistry

    A gas has a density of 1.25 g/L at STP. What is its molecular mass?

    asked on September 2, 2010

    WHAT HAPPENS IF EARTH'S MINERALS ARE USED UP? Will more grow or will there be no more Some minerals are being formed all the tme; others are not and will die out, so to speak, or be redustributed and any one site will be too small to pay to mine.

    asked on December 11, 2006
  39. SS

    How did the Mexican-American War ignite a conflict over slavery between the North and the South?

    asked on May 26, 2016
  40. General Chemistry

    When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced. CaCO3(s)+2HCl(aq)--> CaCl2(aq)+H2O (l)+CO2(g) How many grams of calcium chloride will be produced when 32.0 g of calcium carbonate are combined

    asked on February 6, 2013
  41. math

    An urn contains 10 red balls, 6 green balls, 15 orange balls, and 14 blue balls. If one ball is randomly drawn from the urn, what are the odds against the ball being red? State your answer as a ratio using a colon to separate the two numbers.

    asked on November 2, 2017
  42. Math

    Example of a real-world relationship where there is no clear independent or dependent variable.

    asked on January 13, 2015
  43. Science

    Which are reasons to get a claim peer reviewed? Check all that apply. A peer review verifies conclusions. A peer review proves everyone else wrong. A peer review maintains standards of the field. A peer review identifies sources of errors. A peer review

    asked on September 13, 2015
  44. physics

    an arrow is shot at a 30 degree angle with the horizontal. it has a velocity of 49 m/s how high will the arrow go? what horizontal distance will the arrow travel? and how long will the arrow be in the air?

    asked on December 17, 2017
  45. Chemistry

    Draw the resonance structures for SeS2 and SiS2. There are 2 for SeS2 and 3 for SiS2. I really need help with this. If it can be explain with words, since pictures would be hard. Thanks!

    asked on December 1, 2010
  46. world history

    How did movable type help the Chinese to record their knowledge in a permanent form?

    asked on December 5, 2010
  47. algebra


    asked on February 27, 2019
  48. Geometry

    ABCD is a parallelogram. If AB = 2x - y, CD = 7, BC = x + y , AD = 2 find x and y.

    asked on September 4, 2011
  49. Science

    The coinage metals - copper, silver, and gold - are considered to be a chemical family. List three arguments to explain why. Please help!!

    asked on June 1, 2017
  50. Chemistry

    An unsealed 750 mL beaker contains 500 mL of very dense gas at 25.0 degrees C and 1.10 atm. The gas is much denser than the surrounding air, so it does not disperse into the air. (a) At constant pressure, what would the temperature have to reach for the

    asked on March 6, 2017
  51. 7th grade math (probability)

    I'm re-posting corrections originally from Wednesday in addition to new ones. Still not sure how to answer #4. 2. Edwin rolls a number cube and then spins a color from a color card (red, yellow, blue, green, white). What is the probability that he will

    asked on May 8, 2015
  52. history

    Can someone give me links for these please? Describe the military strategy that General William T. Sherman used across Georgia and South Carolina. Explain how the strategy affected the south, as well as how southerners reacted. Explain the purpose of

    asked on May 11, 2016
  53. Chemistry

    The heat of neutralization of HCl(aq) and NaOH(aq) is -55.90 kJ/mol of water produced. If 50.00 mL of 1.16 M NaOH at 25.15 ºC is added to 25.00 mL of 1.79 M HCl at 26.34 ºC in a plastic-foam cup calorimeter, what willthe solution temperature be

    asked on November 1, 2015
  54. physics

    Anna applies a force of 19.5 newtons to push a book placed on a table. If the normal force of the book is 51.7 newtons, what is the coefficient of kinetic friction? A) .01 B) .20 C) .38 D) .48

    asked on April 7, 2015
  55. physics URGENT! HELP

    If an object is thrown in an upward direction from the top of a building 1.60 x 102 ft. high at an initial velocity of 21.82 mi/h, what is its final velocity when it hits the ground? (Disregard wind resistance. Round answer to nearest whole number and do

    asked on November 7, 2012
  56. Math

    The right side of the orchestra section of the Nederlander Theatre in New York City has 19 rows, and the last row has 27 seats. The number of seats in each row increases by 1 as you move toward the back of the section. How many seats are in this section of

    asked on May 14, 2014
  57. Math Personal Finance

    A friend tells you that her savings account doubled in 9 years. Use the Rule of 72 to estimate what the APR of her account was.

    asked on June 8, 2014
  58. AP Physics B

    A 63.6-kg bungee jumper is standing on a tall platform (h0 = 50.6 m). The bungee cord has an unstrained length of L0 = 9.54 m and, when stretched, behaves like an ideal spring with a spring constant of k = 67.8 N/m. The jumper falls from rest, and it is

    asked on November 29, 2012
  59. 9th grade algebra (completing square)

    Can you check the following? A1. (2x + 3)^2 = 25 sqrt(2x + 3)^2 = +-sqrt(25) 2x + 3 = +- 5 2x + 3 = 5, 2x + 3 = -5 2x = 2, 2x = -8 x = 1, x = -4 {-4, 1} A2. x^2 + 14x + 45 = 0 x^2 + 14x + __ = -45 + __ x^2 + 14x + 49 = -45 + 49 (x +7)^2 = 4 sqrt(x+7)^2 =

    asked on November 9, 2016
  60. Math Personal Finance

    Assume a 30-month CD purchased for $4000 pays simple interest at an annual rate of 5.5%. How much total interest does it earn? What is the balance at maturity?

    asked on June 8, 2014
  61. Finance ( Need help )

    TexMex Food Company is considering a new salsa whose data are shown below. The equipment to be used would be depreciated by the straight-line method over its 3-year life and would have a zero salvage value, and no new working capital would be required.

    asked on July 30, 2009
  62. 7th grade math

    Aaron is staying at a hotel that charges $99.95 per night plus tax for a room. A tax of 8% is applied to the room rate, and an additional one-time untaxed fee of $5.00 is charged by the hotel. Which of the following represents Aaron’s total charge, in

    asked on September 8, 2017
  63. 7th grade math

    Can you check these? 1. Olivia typed 2 pages in 15 minutes. Write an equation relating the number of minutes m to the number of pages typed. How long will it take her to type 10 pages at this rate? Ans: 15/2 = 7.5 = 7.5 * 10 = 75 minutes 2. If the ratio of

    asked on December 6, 2014
  64. 6th grade grammar

    Can you check these sentences? Identify whether each sentence includes an action verb, linking verb, or verb phrase. 1. Celina is coming to my house after dinner. Linking = is verb phrase = is coming 2. The weather was beautiful this past weekend. Linking

    asked on December 11, 2013
  65. Help! - Social Studies

    What nationally known company was a direct result of the first Texas oil boom? A) British Petroleum B) Chem-Central C) Chevron D) Texaco

    asked on February 12, 2019
  66. Physics

    A magnifier has a magnification of 6x. How far from the lens should an object be held so that its image is at the near point distance of 25 cm? I tried doing the problem by using the equation M = 25cm / f. M = 25 cm/6 = 4.17 cm However when I put the

    asked on February 10, 2015
  67. MATH


    asked on March 24, 2013
  68. math

    3. -3p > -48 The answer is p < 16 but idk why? 6. Which inequality matches the graph? The graph is -3 -2 -1 0 1 2 3 4 and there is a red line from 1 to -3 The answer is 3x + 1 _< 4 but idk why? 19. Which inequality matches the graph? -3 -2 -1 0 1 2 3 4 and

    asked on December 18, 2015
  69. General Chem

    Nitrogen oxide reacts with oxygen gas to form nitrogen dioxide (NO2). In one experiment 0.866 mole of NO is mixed with 0.503 mole of O2. Calculate the number of moles of NO2 produced

    asked on October 12, 2012
  70. MATH


    asked on March 24, 2013
  71. Hisyory

    How are Aristotle's teachings related to the scientific method used by scientists today?

    asked on May 21, 2016
  72. Geometry

    Point C is the center of the circle. Angle ACB measures56 degrees What is the measure of arc AB? How do you work this out?

    asked on September 12, 2011
  73. Personal Finance

    Suppose you put in a savings account at an APR of 6% compounded monthly. Fill in the table below rounding your answers to the nearest cent. (Calculate the interest and compound it by hand each month rather than using the compound interest formula.) Month

    asked on June 8, 2014
  74. science

    could someone help me

    asked on May 4, 2019
  75. basic english

    The gist of the saying went something like this: If a person wants to get ahead in life, you have to be willing to work for it. Which of the following language conventions is violated in the sentence above? Use of a colon Verb tense Pronoun-antecedent

    asked on May 26, 2015
  76. Math Personal Finance

    A friend tells you that her savings account doubled in years. Use the Rule of 72 to estimate what the APR of her account was. APR=____%

    asked on June 8, 2014
  77. Algebra

    A project can be completed by n workers in t days. If 56 workers need 7 days to finish the project, find the value of k - I found k. K=392 Final step - Hence, express n in terms of t. WHAT DO I DO HERE?

    asked on January 15, 2019
  78. physics

    A proposed space station consists of a circular tube that will rotate about its center(like a tubular bicycle tire). The circle formed by the tube has a diameter of 1.1km. What must be the rotation speed(revolutions per day) in an effect nearly equal to

    asked on January 7, 2015
  79. Math

    The Table shows some common scales used in a model railroading.For each scale,find the length of a model of an 82-foot long boxcar.Give the length of each model in inches. Scale Name/Scale N 1:160, S 1:64, O 1:48

    asked on March 16, 2011
  80. College Chemistry

    Given that delta Hrxn for OH- ions is -229.6 kJ/mol, calculate the enthalpy of neutralization when I mole of a strong monoprotic acid (such as HCl) is titrated by 1 mole of a strong base (such as KOH) at 25-degrees C.

    asked on October 26, 2010
  81. physics

    An alpha particle, the nucleus of a helium atom, is at rest at the origin of a Cartesian coordinate system. A proton is moving with a velocity of v towards the alpha particle from the positive x axis direction. If the proton is initially far enough away to

    asked on September 29, 2008
  82. Chemistry Help Please :)

    I'm stuck on how to do these 4 problems concerning Chemical Equilibriums. When varsol and iodine/pottasium iodide solutions are mixed, the two phases form.. phase A (top) would be pink and phase B (bottom) would be brown. What are the colours in each

    asked on February 12, 2012
  83. Physics

    A 15.0 gram bullet strikes and becomes embedded in a 1.24 kg block of wood placed on a horizontal surface just in front of the gun. If the coefficient of kinetic friction between the block and the surface is 0.280, and the impact drives the block a

    asked on January 5, 2011
  84. math

    The region between the graphs of y=x^2 and y=2x is rotated around the line x=2. how do you find the volume of the object?

    asked on September 29, 2008
  85. Calculus 2

    A culture of bacteria is growing at the rate of 20e^0.8t cells per day, where t is the number of days since the culture was started. Suppose that the culture began with 50 cells. (a) Find a formula for the total number of cells in the culture after t days.

    asked on September 18, 2016
  86. 7th grade math

    1. Evan withdrew a total of $160 from an ATM machine over a 4-day period. He withdrew the same amount of money each day. a. Write an expression to represent the total amount that Evan's account changed each day. Ans: 4d b. What integer represents the total

    asked on March 24, 2015
  87. accounting

    The accounting records of NuTronics, Inc., include the following information for the year ended December 31, 2011. Dec. 31 Jan. 1 Inventory of materials $ 24,000 $ 20,000 Inventory of work in process 8,000 12,000 Inventory of finished goods 90,000 80,000

    asked on January 22, 2013
  88. social studies

    Read the passage from the apology to the Aborigines issued in 2008 by the Australian government. “Let the parliament reflect for a moment on the following facts: that, between 1910 and 1970, between 10 and 30 per cent of Indigenous children were forcibly

    asked on May 28, 2019
  89. 7th grade math

    Can you check my answers please. 1. Joe and his friends at 3/8 of pie. If the pie was cut into 8 pieces, how many pieces are left? Ans: 8/8 - 3/8 = 5/8 pieces left 2. Michaela walked 2/5 miles to the store in 1/4 hour. What's her walking pace? Ans:

    asked on October 7, 2014
  90. Chemistry

    in the reaction:Ni+SN4+-->Ni2+ (+)Sn2+ which species has been reduced? 1.Ni 2.Sn4+ 3.Ni2+ 4.Sn2+ i know its def Sn but im not sure which one.

    asked on March 20, 2011
  91. Math

    It takes Beth 15 minutes to walk to school, 1/2 mile away. What is her walking pace?

    asked on January 31, 2016
  92. Science

    Hurricane Katrina, which hit the Gulf Coast of Louisiana and Mississippi on August 29, 2005, had the second lowest ever recorded barometric pressure at 920mb. Convert this pressure to units of atmospheres, and inches of Hg. 1 bar = 0.98692 atm 0.92 bar =

    asked on September 2, 2015
  93. Calculus

    An air traffic controller spots 2 planes at the same altitude converging on a point as they fly at right angles to each other. One plane is 150 miles from the point moving at 450 miles per hour. The other plane is 200 miles from the point moving at 600

    asked on October 25, 2011
  94. Social Studies

    I have no idea what to do,if you can give me some tips of ideas I'll be extreamlly grateful. Heres what I need help with. Tell about the hardships of the early colonies and colonists. Pretend you are partiticipating in a town meeting to discuss the

    asked on December 20, 2018
  95. Physics

    You are very slowly pushing up an incline with a calculator sitting on it. The coefficient of static friction is 0.7. At what angle θ will the calculator start sliding?

    asked on October 26, 2010
  96. 7th grade LA

    Can you check the following? 1. I didn't know what time it was so I was very late to class indep = I didn't know what time it was indep = I was very late to class Ans: compound 2. I'll help you if you help me. indep = I'll help you dep = if you help me

    asked on October 15, 2014
  97. chemistry

    A student mixed 75.0 mL of water containing 0.75 mol HCl at 25�C with 75.0 mL of water containing 0.75 mol of NaOH at 25�C in a foam cup calorimeter. The temperature of the resulting solution increased to 35�C. How much heat in kilojoules was

    asked on February 7, 2012
  98. 7th grade math

    Can you check these please? 4. A local bakery sold 60 loaves of bread in one day. If 65% of these were sold in the afternoon, how many loaves were sold in the afternoon? Ans: x = .65 * 60 x = 39 loaves 7. Ruben bought 6new books for his collection. This

    asked on January 17, 2015
  99. Math

    A photographer wants to print a photograph and two smaller copies on a rectangular sheet of paper. The larger photographer and the smaller photographs are in proportion. The larger photograph has a width of 4 inches and a length of 6 inches. Find the

    asked on January 21, 2019
  100. SS

    How did the Radical Republican Reconstruction plan affect life in South Carolina? a) the law did not give African Americans equal protection b) the state regained the right to decide local matters c) white males who participated in the war were permitted

    asked on February 25, 2016


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