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. 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
  3. 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
  4. 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
  5. 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
  6. maths

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

    asked on May 21, 2011
  7. finance

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

    asked on December 12, 2008
  8. 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
  9. 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
  10. 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
  11. 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
  12. algebra

    Need help for a test show all steps to solve problem evaluate the expression for given value of variable. -(4h-1) line is under 4h-1 under line is|th then it is ;h=2 can't text back on kindle don't have a button to reply thank you

    asked on February 19, 2014
  13. 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
  14. 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
  15. 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
  16. history

    Only July 14, 1789, people in Paris, France attacked a prison holding political prisoners. This marked the start of the French Revolution. In 1791, France’s National Assembly passed laws and the Declaration of the Rights of Man which declared all people

    asked on January 7, 2020
  17. Physical Science

    What volume would 90g occupy?

    asked on September 7, 2014
  18. 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
  19. algebra

    Use properties of real numbers to rewrite expression(3/5)(5/3)answers are 8/15,, 15/8,, 0, 1

    asked on February 22, 2014
  20. algebra

    To which set of numbers does the number belong-55 answers are, Natural, whole, integers, irrational

    asked on February 21, 2014
  21. 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
  22. 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
  23. 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
  24. 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
  25. Physics

    A Sunway train starts from rest at a station and accelerates at a rate of 2.0 ms^-2 for 10 s. It runs for constant speed for 50 s and slows down at a rate of 3.5 ms^-2 until it stops at the next station. Find the total distance covered Draw the velocity vs

    asked on September 28, 2016
  26. 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
  27. maths

    find the perpendicular distance from the corner of the triangle to the opposite side if the side is 25cm long

    asked on February 16, 2012
  28. 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
  29. 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
  30. 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
  31. 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
  32. 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
  33. 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
  34. 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
  35. 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
  36. 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
  37. P.E. HEALTH

    True or False: The main process for digestion takes place in the stomach. Is the answer False?

    asked on October 31, 2014
  38. 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
  39. 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
  40. 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
  41. algebra

    Which graph best represent following expression|x-1|>2

    asked on February 26, 2014
  42. algebra

    Insertor=to make the sentence true -1/3-2/5 answers are. = < >

    asked on February 21, 2014
  43. 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
  44. 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
  45. english

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

    asked on January 24, 2012
  46. 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
  47. Chem

    Why is BaSO4 insoluble in HNO3?

    asked on November 15, 2010
  48. Chemistry

    What is the equilibrium constant for the reaction: HCOOH(aq)+ OH (aq) HCOO(aq)+ H2O(l) Ka= 1.7 * 10^-4 Kb for the conjugate base= 4.9 * 10^-11 Thank you!

    asked on May 10, 2010
  49. 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
  50. 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
  51. 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
  52. Math

    A house has increased in value by 38% since it was purchased. if the current values is $621,000, what was the value when it was purchased?

    asked on April 22, 2020
  53. Math

    A fruit company delivers it’s fruit and two types of boxes large and small delivery of five large boxes and six more boxes has a total weight of 175 kg a delivery of three large boxes and two small boxes has a total weight of 83 kg how much does each

    asked on April 8, 2020
  54. Math

    Support at the height in centimeters of a candle is a linear function of them out of time in hours it has been burning after 12 hours of burning a candle has a height of 18.6 cm after 29 hours of burning its height is 15.2 Cm what is the height of the

    asked on April 5, 2020
  55. Math

    A rectangular prism has a length of 14.8 m, a width of 5.2 m, and a height of 6 m. What is the volume of the prism?

    asked on December 12, 2019
  56. 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
  57. Science

    Earthquakes and Seismic Waves •If the statement is true right true if the statement is false change the underlined word or words(I’ll put them in parentheses) to make this statement true.• 1.______The shaking and trembling that results for movement

    asked on February 8, 2018
  58. Chemistry (Easy)

    So say if we're doing an electronic configuration for the element "Lead", We would do [Xe] 6s^2 and 4F^14, but we still need to add in the "d" block. Would it be 5d^9 or 5d^10?

    asked on December 19, 2017
  59. medical coding

    ICD diagnosis code for traumatic left second fracture of metatarsal

    asked on November 27, 2016
  60. 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
  61. Chemistry

    I have a question about solubility rules and net ionic equations so for example : CuSO4+Ba(NO3)2----->BaSO4+Cu(NO3)2 Okay so I know BaSO4 is insoluble while Cu(NO3)is solulable, that means BaSO4 will have a precipitate while Cu(NO3) doesn't. So does that

    asked on October 8, 2016
  62. physics

    Two racing boats set out from the same dock and speed away at the same constant speed of 119 km/h for half an hour (0.500 h), the blue boat headed 26.8° south of west, and the green boat headed 41.4° south of west. During this half-hour (a) how much

    asked on September 28, 2015
  63. 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
  64. Chemistry

    What volume (mL) of 0.20 M HCl needs to be added to 1.23 L of 0.10 M acetic acid to reduce the percent ionization to 1.00%? Assume the volume of HCl added is negligible compared to the volume of the whole solution, and that the small x approximation is

    asked on March 3, 2015
  65. 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
  66. 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
  67. 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
  68. 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
  69. 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
  70. 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
  71. Trigonometry

    Triangle PQR has vertices P(0, 1), Q(0, -4), and R(2, 5). Find the coordinates of R' to the nearest hundredth after rotating triangle PQR counterclockwise about the origin 45º.

    asked on October 17, 2014
  72. Trigonometry

    Triangle PQR has vertices P(0, 1), Q(0, -4), and R(2, 5). Find the coordinates of R' to the nearest hundredth after rotating triangle PQR counterclockwise about the origin 45º.

    asked on October 17, 2014
  73. Trigonometry

    Evaluate the inverse trigonometric function. Give your answer to the nearest degree. (Enter only the number.) cos^-1 (-1)

    asked on September 30, 2014
  74. Trigonometry

    Solve sin θ = 0.95 for -90º ≤ θ ≤ 90º.

    asked on September 30, 2014
  75. 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
  76. Family

    What career is more worthy to go to college for and save the most money? A.) Vet Tech B.) Preschool/Kindergarden Teacher C.) Pilot D.) Manager A or B ??

    asked on April 2, 2014
  77. 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
  78. algebra

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

    asked on February 21, 2014
  79. algebra

    Graph the number on a number line 10/7

    asked on February 21, 2014
  80. algebra

    Which inequality represent the following eight fewer than a number is at least sentence 20 answers are. X-8>20. 8-X>20, x+8

    asked on February 21, 2014
  81. algebra

    Which equivalent form following equation 2x-3y=3 need help doing test thank you

    asked on February 19, 2014
  82. algebra

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

    asked on February 18, 2014
  83. chemistry

    Write the equation for the dissociation of carbonic acid.

    asked on November 21, 2013
  84. 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
  85. Chemistry

    If you could me solve ths is anyway, it would be much appreciated. A solution containing 3.50g of sodium carbonate is mixed with one that contains 5.00g of silver nitrate. a. Write the complete chemical equation and the net ionic equation for the reaction

    asked on June 29, 2013
  86. Chemistry

    If you could me solve ths is anyway, it would be much appreciated. A solution containing 3.50g of sodium carbonate is mixed with one that contains 5.00g of silver nitrate. a. Write the complete chemical equation and the net ionic equation for the reaction

    asked on June 29, 2013
  87. science

    how can you define the problem how far can you make a rubber stopper fly through the air if the only force applied comes from a gas forming chemical reaction

    asked on May 15, 2013
  88. chemistry

    Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles) of He is present in a helium-oxygen mixture having a density of 0.528g/L at 25 degree celsius and 721 mmHg ?

    asked on May 4, 2013
  89. math

    I have a question is this cheating when we ask questions from our school work ? Wouldn't our on line school know we are kids are doing this ? What is an ethical homework question ? Curious..

    asked on February 2, 2013
  90. 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
  91. 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
  92. math

    Find a fraction that reduces to 3/4 when both the numerator and denominator are decreased by i, and reduces to 4/5 when both the numerator and denominator are each increased by 1. I know the answer is 7/9, but i don't know how to solve (i must use a system

    asked on January 23, 2013
  93. World history

    12. The Delhi Sultanate ruler Radiyya first took power chiefly because A. she proved herself in battle. B. she wore men's clothes. C. she killed her brother. D. her father chose her as his successor. I chose c

    asked on December 19, 2012
  94. Spanish

    R these correct??plz help En la 11. ___________ te llamé. De la oscuridad me llamaste. Reconocí tu 12. ___________. Reconociste la mia. “Vente para acá,” 13. ___________. Respondiste: “¿Dónde estás, papá? No te 14. ___________ .” “ 15.

    asked on December 7, 2012
  95. Child day care

    10. Which of the following accreditation organizations does not have its headquarters in the United States? A. NAEYC B. AMS C. AMI D. CWLA

    asked on December 5, 2012
  96. physics

    The punter on a football team tries to kick a football so that it stays in the air for a long "hang time." If the ball is kicked with an initial velocity of 25.2 m/s at an angle of 58.5° above the ground, what is the "hang time"?

    asked on October 4, 2012
  97. 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
  98. chemistry

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

    asked on February 28, 2012
  99. 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
  100. Math

    Jonathan can type a 20 page document in 40 minutes, Susan can type it in 30 minutes, and Jack can type it in 24 minutes. Working together, how much time will it take them to type the same document?

    asked on February 15, 2011


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