Popular questions and responses by molly
  1. chemistry

    Hello, I was confused on this chemistry problem and I was wondering if someone could please help me. 1) Consider the following chemical reaction: 2CH3OH(I) + 3O2 (g) → 2CO2(g) + 4H2O(I) Calculate the number of moles of CO2 produced when 11.25 mL of

    asked on February 19, 2017
  2. Chemistry

    can you please please help me with these questions I don't know how to do any of them. I know how to calculate moles and grams and mole ratio,etc but I don't understand the limiting excess reactant and yield stuff. Thanks! 1.In the following chemical

    asked on October 2, 2016
  3. maths

    a cube has a volume of 27cm3 what is the length of one side of the cube

    asked on May 21, 2011
  4. physics

    true or false If a net force acts on an object, the object's speed will change. An object's velocity will change if a net force acts on the object. If two object have the same acceleration, they are under the influence of equal forces. The net force which

    asked on October 4, 2010
  5. Math

    If a graph of a quadratic function can have 0, 1 or 2 x-intercepts. How can you predict the number of x-intercepts without drawing the graph or (completely) solving the related equation? Suppose that the graph of f(x) = ax^2+bx+c has x-intercepts (m,0) and

    asked on June 4, 2015
  6. Physics Problem

    While running, a 70.0 kg student generates thermal energy at a rate of 1200 W. To maintain a constant body temperature of 37.0 C, this energy must be removed by perspiration or other mechanisms. If these mechanisms failed and the heat could not flow out of

    asked on December 3, 2007
  7. Physics. Please!!

    If the force on the tympanic membrane (eardrum) increases by about 1.50 N above the force from atmospheric pressure, the membrane can be damaged. When you go scuba diving in the ocean, below what depth could damage to your eardrum start to occur? The

    asked on November 30, 2007
  8. Math

    A man on the 8th floor of a building sees a bucket (dropped by a window washer) pass his window and notes that it hits the ground 1.5s later. Assuming a floor is 12ft high (and neglecting air friction), from which floor was the bucket dropped?

    asked on October 7, 2013
  9. Chemistry

    PCl5 --> PCl3 + Cl2 (Kp = 630 at 546 K) A system is prepared by placing equimolar amounts of the three gases shown in the equation above in a suitable rigid container held at constant volume. Equilibrium is established at 546 K. (A) When equilibrium is

    asked on April 25, 2011
  10. Chemistry

    Which of the following equations is balanced correctly? A. 2 C3H3 + O2 → 2 CO2 + H2O B. Cl2 + 2 KBr → KCl + Br2 C. 3 H2O → H2 + 3 O2 D. 2 C2H2 + 5 O2 → 4 CO2 + 2 H2O Can anyone help me figure out which is balanced correctly?

    asked on April 28, 2018
  11. Math

    A 100 gallon tank is filled with a salt solution containing 10 lbs of salt. Pure water is pumped in at a rate of 5 gallons per minute and pumped out at the same rate. How many minutes will it take the amount of salt to drop to 8 lbs? Round to one decimal

    asked on December 5, 2016
  12. algebra1

    During on Alpine skiing event the times of four Scears were listed below time is measured in seconds skier a= 114.36 skier b=14.40 skier c=114.48 skierD =114.44 If the stopwatch used was only accurate to the 10th of a second which skiers time would be

    asked on August 27, 2014
  13. Spanish

    Can u correctly write these sentences in Spanish,plz? 1. I'm very proud of my son. 2. He can spell his name backward and forward. 3. What's his name? 4. How much does a new car cost in America? 5. You must be very rich. If tried already this is wat I got,

    asked on December 6, 2012
  14. Math

    Tracy has one can of iced tea mix. One scoop of the mix makes two servings of iced tea. The scoop holds 1/12 of a can. How many servings of iced tea can Tracy make?

    asked on June 8, 2016
  15. French

    How do you make 'cheveux' feminine?

    asked on November 19, 2009
  16. Abstract Algebra

    Let f:A->B where A and B are nonempty. Prove that f(S1 U S2) = f(S1) U f(S2)

    asked on February 5, 2011
  17. Chemistry

    C7H6O3+CH3OH→C8H8O3+H2O In any experiment, 1.50g of salicyclic acid is reacted with 11.20g of methanol. The yield of methyl salicylate, C8H8O3, is 1.31g. What is the percent yield? From my understanding the equation is already balanced, correct? My

    asked on April 14, 2010
  18. Physics check

    An excited atom decays to its ground state and emits a green photon. If the atom decayed to an intermediate state instead, the photon emitted could be.... red or blue?

    asked on April 11, 2008
  19. Math

    Kevin is planting 15 bushes and 9 trees in rows. If he wants all the rows to be exactly the same, with no plants left over, what is the greatest number of rows Kevin can plant? I need help.. I think you need to find the greatest common factor? And that

    asked on November 14, 2019
  20. Finite

    Assume that the test has 5 true/false questions, and 10 multiple choice questions (4 options per questions), each with exactly one correct answer. If a student guesses randomly on each question, what is his expected score? .5*5+10*.25 5/15?

    asked on October 10, 2016
  21. History

    Between 1850 and 1860 several events occurred in the U.S. that highlighted the struggle over slavery. Describe these events and state what finally led to secession of the South beginning in December of 1860.

    asked on December 9, 2014
  22. Physics

    Two point charges are located on the y axis as follows: charge q1 = -2.50nC at y1 = -0.700m , and charge q2 = 3.30nC at the origin (y = 0). What is the magnitude of the net force exerted by these two charges on a third charge q3 = 9.00nC located at y3 =

    asked on September 7, 2014
  23. Physics

    A charge q1 = 5.00nC is placed at the origin of an xy-coordinate system, and a charge q2 = -2.00nC is placed on the positive x axis at x= 4.00cm . If a third charge q3 = 6.50nC is now placed at the point x= 4.00cm , y= 3.00cm find the x and y components of

    asked on September 7, 2014
  24. algebra

    Show all steps solve the problem evaluate the expression for given value of variable|-4b-8|+|-1=b2|+2b3:b=-2

    asked on February 19, 2014
  25. english

    what is the analogy for monkey if cardinal is to bird as monkey is to?

    asked on January 24, 2012
  26. finance

    the cost of common stock is usually greater than the simple dividend yield because?

    asked on December 12, 2008
  27. biology

    I need to determine if the following statements are a prediction (P), a hypothesis (H) or an observation (O). Then, I need to determine if they are of inductive or deductive reasoning. Male Red-winged Blackbirds display red wing patches to signal

    asked on March 16, 2008
  28. Science

    Lucy heats some calcium carbonate. She weighs the reaction vessel at the start of the reaction and again after it has been heated. Calcium carbonate decomposes into calcium oxide and carbon dioxide. Look at Lucy’s results: Mass of calcium carbonate

    asked on April 29, 2020
  29. Math

    A party rental company has chairs and tables for rent. The total cost to rent 5 chairs and 2 tables is $18. The total cost to rent 3 chairs and 8 tables is $55. What is the cost to rent each chair and each table ?

    asked on April 9, 2020
  30. math

    Carbon 14 (14C) dating assumes that the carbon dioxide on Earth today has the same radioactive content as it did centuries ago. If this is true, the amount of 14C absorbed by a tree that grew several centuries ago should be the same as the amount of 14C

    asked on May 31, 2018
  31. Social Studies

    1. Why did Xerxes want to conquer Greece? a. to increase his country's wealth b. to win glory c. for revenge d. all of these** 2. Xerxes was king of a. Athens b. Persia** c. Delos d. Crete 3. The Greeks won the Battle of Salamis because their ships a.

    asked on November 13, 2017
  32. Physics

    Two rocks are thrown simultaneously from the top of a very tall tower with identical speeds of v = 7.70 m/s, but in two different directions.One of them is thrown with an angle of 10.0 degrees below the horizontal, the other one at an angle of 50.0 degrees

    asked on September 28, 2014
  33. Physics

    A large horizontal circular platform (M=143.1 kg, r=3.01 m) rotates about a frictionless vertical axle. A student (m=75.3 kg) walks slowly from the rim of the platform toward the center. The angular velocity ω of the system is 2.10 rad/s when the student

    asked on February 11, 2014
  34. Math

    Let V be the volume of a pyramid of height 15 whose base is a square of side 5. Part a). Use similar triangles to find the area of the horizontal cross section at a height y. Part b). Calculate V by integrating the crosss-sectional area.

    asked on July 9, 2013


    asked on October 15, 2009
  36. math

    The monthly cost (in dollars) of a long-distance phone plan is a linear function of the total calling time (in minutes). The monthly cost for 40 minutes of calls is $12.18 and the monthly cost for 97 minutes is $17.31. What is the monthly cost for 54

    asked on April 27, 2020
  37. Math

    Two trains leave stations 216 miles apart at the same time and travel toward each other. one train travels at 95 miles per hour while the other travels at 85 miles per hour how long will it take for two trains to meet? Do not round the answer

    asked on April 22, 2020
  38. math

    The monthly cost (in dollars) of water use is a linear function of the amount of water used (in hundreds of cubic feet, HCF). The cost for using 19 HCF of water is $38.10, and the cost for using 46 HCF is $82.65. What is the cost for using 21 HCF of water?

    asked on April 12, 2020
  39. math

    Suppose that the weight (in pounds) of an airplane is a linear function of the amount of fuel (in gallons) in its tank. When carrying 10 gallons of fuel, the airplane weighs 2026 pounds. When carrying 25 gallons of fuel, it weighs 2155 pounds. How much

    asked on April 12, 2020
  40. Math

    delivery truck is transporting a box of two sizes large and small the large boxes weigh 50 pounds each and a small box is weigh 15 pound each There are 120 boxes in all If the truck is carrying a total of 3725 pounds in boxes how many boxes of each type of

    asked on April 5, 2020
  41. math

    A family had two cars. The first car fuel efficiency of 20 miles per gallon of gas and the second car has a fuel efficiency of 40 miles per gallon of gas. During one particular week the two cars went a combined Total of 1100 miles for a total gas

    asked on April 4, 2020
  42. random

    why cant I find a question that I posted earlier? I find it but when I click on it it takes me back to the list of questions asked today, but mine is not there! WHY?

    asked on January 16, 2018
  43. Chemistry

    can you please please help me with these questions I don't know how to do any of them. I know how to calculate moles and grams and mole ratio,etc but I don't understand the limiting excess reactant and yield stuff. Thanks! 1.In the following chemical

    asked on October 2, 2016
  44. Math

    Suppose sinA = 12/13 with 90º≤A≤180º. Suppose also that sinB = -7/25 with -90º≤B≤0º. Find cos(A - B).

    asked on October 14, 2014
  45. Trigonometry

    A hill in the Tour de France bike race has a grade of 8%. To the nearest degree, what is the angle that this hill makes with the horizontal ground? Round to the nearest tenth of a degree.

    asked on September 26, 2014
  46. Physical Science

    What volume would 90g occupy?

    asked on September 7, 2014
  47. Homework Help Calculus

    Use linear approximation to estimate the amount of paint in cubic centimeters needed to apply a coat of paint 1/100cm thick to a hemispherical dome with a radius of 18 meters. I tried it but I keep getting the wrong answer.Here's what I did below: sphere:

    asked on October 15, 2013
  48. Practice Exam Calculus

    The radius of a sphere was measured to be 20cm with a a possible error of 1/5cm 1).Use linear approximation to estimate the maximum error in the calculated surface area. Leave your answer in terms of pi. 2).Use linear approximation to estimate the maximum

    asked on October 15, 2013
  49. Calculus 1

    (a) What is the continuous percent growth rate for P=130e^0.07t , with time, t , in years? (b) Write this function in the form P=P0a^t. What is the annual percent growth rate? Round your answer to two decimal places. I tried it but now I'm just more

    asked on January 24, 2013
  50. finance

    Alicia Cooper makes sure to contribute ten percent of her monthly earnings to her 401(k) plan at work. Her 401(k) plan allows her to invest in several different types of mutual funds. Which suggestion for the obtaining money she needs for investing is she

    asked on May 21, 2012
  51. pre-algebra

    If a and b are any real numbers, is the statement a x b = b x a always true? Why or why not?

    asked on August 29, 2011
  52. History

    The revolt in Hungary (1956), the demonstrations in Czechoslovakia(1968), and the formation of Solidarity in Poland (1980's) are similar in that they

    asked on May 1, 2011
  53. chemistry please help

    how do you know if a hydrolytic work up is required for reactions with grignard reagents? What does hydrolytic work up mean is it treatment with aqueous acid

    asked on November 2, 2009
  54. Civics

    How do the powers of the national government and the powers of the states compare, according to James Madison, the primary author of the Constitution? A.The powers of the national government are few, while the powers of the states are many. B.The powers of

    asked on April 29, 2020
  55. math

    Suppose that the weight (in pounds) of an airplane is a linear function of the amount of fuel (in gallons) in its tank. When carrying 18 gallons of fuel, the airplane weighs 2199 pounds. When carrying 44 gallons of fuel, it weighs 2342 pounds. How much

    asked on April 27, 2020
  56. math

    Goran is driving to Philadelphia. Suppose that the distance to his destination (in miles) is a linear function of his total driving time (in minutes). Goran has 68 miles to his destination after 28 minutes of driving, and he has 53.6 miles to his

    asked on April 27, 2020
  57. math

    PLEASE HELP ME Which number can be inserted into the parentheses to make a true statement? - 10˚c < ( ) a - 12˚c b - 18˚c c - 3˚c d - 10˚c

    asked on March 8, 2020
  58. math

    finance charges Calculate the monthly finance charge for the credit card transaction. Assume that it takes 10 days for a payment to be received and recorded, and that the month is 30 days long. (Round your answers to the nearest cent.) $500 balance, 17%,

    asked on January 11, 2020
  59. Math

    My teacher usually gives out a good bit of homework, but today she only gave us this problem. A cookie recipe calls for 1 cup of white sugar, to 3 cups of brown sugar. Write the value of the ratio of the amount of white sugar to the amount of brown sugar.

    asked on October 30, 2019
  60. calc

    The quantity (in yards) of a certain fabric that is sold by a manufacturer at a price of p dollars per yard is Q = f(p). 1) What is the meaning of the derivative f ' (16)? 2) What are its units? 3) Is f ' (16) positive or negative? Explain.

    asked on February 6, 2016
  61. college physics

    A fisherman poles a boat as he searches for his next catch. He pushes parallel to the length of the light pole, exerting a force of 245 on the bottom of a shallow lake. The pole lies in the vertical plane containing the boat's keel. At one moment, the pole

    asked on March 2, 2015
  62. Chem-mystery

    Determine the PH of a solution that results from mixing 50 ml of .200 M hydroazoic acid, HN3 with 50 ml of CA(OH)2

    asked on March 2, 2015
  63. Chemistry

    What concentration of of CN- is needed to produce the same POH as 3.5*10^-5M solution of BA(OH)2?

    asked on March 2, 2015
  64. Chemistry

    What volume (mL) of .20 M HCL needs to be added to 1.23 L of .10 M acetic acid to reduce percent ionization to 1.00%?

    asked on March 2, 2015
  65. Chemistry

    What concentration of of CN- is needed to produce the same POH as 3.5*10^-5M solution of BA(OH)2?

    asked on March 2, 2015
  66. math

    Brandon has a 55-gallon fish tank. He estimates he can drain the tank at an average rate of 11 gallons per minute. In a linear model of this situation, x represents the number of minutes the tank has been draining. Relative to this situation, what does the

    asked on March 1, 2014
  67. Physics

    In a two-dimensional tug-of-war, Alex, Betty, and Charles pull horizontally on an automobile tire at the angles shown in the picture. The tire remains stationary in spite of the three pulls. Alex pulls with force of magnitude 207 N, and Charles pulls with

    asked on March 1, 2014
  68. Physics

    In a two-dimensional tug-of-war, Alex, Betty, and Charles pull horizontally on an automobile tire at the angles shown in the picture. The tire remains stationary in spite of the three pulls. Alex pulls with force of magnitude 207 N, and Charles pulls with

    asked on February 28, 2014
  69. algebra

    Name the property of real numbers illustrated by the equation2·(8·7)=(2·8)·7answers are distributive property, associative property multiplication, communicative property, associative addition

    asked on February 22, 2014
  70. algebra

    Name the property of real numbers illustrated by the equation2·(8·7)=(2·8)·7

    asked on February 21, 2014
  71. algebra

    Which of the following is equal to (2x/5-9)+9. Answers are 2x/5, 5x/2, 2x/5-45, (2 x-9)+45

    asked on February 20, 2014
  72. algebra

    Show all steps solve the equation check for extraneous solution 9|9-8 x|=2x+3

    asked on February 18, 2014
  73. Physics

    A long thin rod lies along the x-axis from the origin to x=L, with L= 0.890 m. The mass per unit length, λ (in kg/m) varies according to the equation λ = λ0 (1+1.410x2). The value of λ0 is 0.700 kg/m and x is in meters. 1. Calculate the total mass of

    asked on February 11, 2014
  74. Chemistry 1

    Imagine that a hypothetical life form is discovered on our moon and transported to Earth. On a hot day, this life form begins to sweat, and it is determined that the heat of vaporization of its sweat is 215 cal/g. The scientist observing the

    asked on January 24, 2014
  75. Math 9 algebra

    A mechanic charges $70 an hour plus the cost of parts to repair a vehicle. The parts cost $215 for the repair on Tamara's car. A) write an expression for the total cost, C, of repairing Tamara's car for any numbers of hours, n. B) use the expression you

    asked on January 26, 2013
  76. Math 9

    use exponent rules to simplify. Write as a single power, don't need to find the value. [ (11/20)^4 x (11/20)^-8]^5 and (11/20)^-6 you cant leave an number to the power of a negative exponent. You have to change it like this ex : 2^-3 = 1/2^3 = 1/8

    asked on January 13, 2013
  77. Child day care

    12. Which of the following is a factor that's very important to high-quality child care, but not often covered in state licensing regulations? A. The group size B. A fire safety clearance C. The staff-to-child ratio D. An annual visit by a representative

    asked on December 6, 2012
  78. Physical Science- Help Please!

    Suppose that you are given a 100 gram sample of a radioactive substance with a half-life of 32 days. How many grams will be left after 192 days?

    asked on December 5, 2012
  79. Place value whole numbers

    The tens digit is three times the thousands digit.

    asked on August 28, 2012
  80. Anatomy and Physiology

    If one solution is 1000 x as acidic as another, how many pH units would there be between the two?

    asked on July 26, 2012
  81. chemistry

    what is the effects of NH3(aq) and HCl(aq) on the CuSO4 or NiCl2 solution

    asked on February 28, 2012
  82. physics

    A car traveling at 91.0 km/h approaches the turnoff for a restaurant 30.0 m ahead. If the driver slams on the brakes with an acceleration of -6.40 m/s^2, what will her stopping distance be?

    asked on November 20, 2011
  83. physics

    1. There are three forces acting on an object, a 30N force pulling right, a 50N force pushing right, and 30N frictional force pushing left. a. What is the force of gravity on this 15kg object? b. If the object is on the ground what is the normal force

    asked on June 21, 2011
  84. Abstract Algebra

    Let A= -{-1}, that is, the set of all real numbers except -1. Define an operation on A by a*b=a+b+ab (usual addition and multiplication in R) a) Show that * is closed on A b) show that * is associative c) Find the identity element for * and verify that it

    asked on February 22, 2011
  85. geometry

    If the perimeter of a particular square is 2011 inches, what is the area of the square, in square inches? Express your answer in decimal form to the nearest hundredth.

    asked on January 25, 2011
  86. College Algebra

    Al gives 1/2 of his marbles to bev. bev gives 1/3 of these to carl. carl gives 1/4 of these to dani. If dani was given four marbles, how many did al have originally?

    asked on January 23, 2011
  87. accounting

    This is the question: "Use page 3 of the journal. Jornalize and post the adjusting entries." Can you tell me how to do that?

    asked on December 10, 2010
  88. College Chemistry

    Calculate the vapor pressure of a solution of 0.39 mol of cholesterol in 5.4 mol of toluene at 32oC. Pure toluene has a vapor pressure of 41 torr at 32oC.

    asked on November 19, 2010
  89. algebra

    Solve: 4 sqrt (x) = 8 + 2 sqrt (x) a) (-4) b) (16) c) none d) (4) c

    asked on June 18, 2010
  90. statistics

    Use this table to answer the questions. Height (in inches) Frequency 50-52 5 53-55 8 56-58 12 59-61 13 62-64 11 1. Identify the class width. 2. Identify the midpoint of the first class. 3. Identify the class boundaries of the first class. 4. Give the

    asked on May 19, 2010
  91. math

    what is the solution of the following system of equations? y = -2/3x y = 1 a) (-2,3) b) (1,-2/3) c) (-3/2,1) d) (1,-3)

    asked on April 28, 2010
  92. English

    What language was Metamorphoses by Ovid written in?

    asked on February 20, 2010
  93. Physics

    Two children playing on the beach are pulling on an inner tube. One exerts a force of 45 N [N]. The other exerts a force of 60 N [SW]. What is the net force acting on the tube?

    asked on October 7, 2009
  94. English Proofread

    Can you please read my first paragraph for my cover letter. The writer had to identify self and purpose in the 1st paragraph. Can you please give me feedback and check my grammar? Thank you help is greatly appreciated Your advertisement for any entry-level

    asked on March 25, 2009
  95. English

    I have my resume written but I have a few questions before I type it out. Under experience do I list just the company name that I worked for or do I put the entire address followed by what that job entitled? I added achievements do I have to add activities

    asked on March 25, 2009
  96. chemistry help please!

    For my year 7 homework i have had to write a poster about pyhsical and chemical changes when a candle is alight. We have had to use certain vocabulary and one is evaporation. I know what this term means but don't know what evaporates when a candle is

    asked on October 22, 2008
  97. science

    how can we save water??? how do we recycle???

    asked on June 7, 2008
  98. science

    imagine you are flyingfrom seattle to san francisco,which is almost exactly due south of seattle.shoud the pilot set a course due south? explain your answer.

    asked on March 12, 2008
  99. PHysics

    A medical technician is trying to determine what percentage of a patient's artery is blocked by plaque. To do this, she measures the blood pressure just before the region of blockage and finds that it is 1.20×104 Pa, while in the region of blockage it is

    asked on November 29, 2007
  100. Mathematics

    5.6 X 10^8 + 7.8 X 10^7 Written in Scientific Notation

    asked on April 30, 2020


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