Most popular questions and responses by b
  1. math (stats)

    According to Masterfoods, the company that manufactures M&M’s, 12% of peanut M&M’s are brown, 15% are yellow, 12% are red, 23% are blue, 23% are orange and 15% are green. [Round your answers to three decimal places, for example: 0.123] Compute the

    asked on October 2, 2016
  2. Science

    Describe the flow of blood in the human body, including through each of the four chambers of the heart. Explain how the blood changes as it moves through various locations in the body.

    asked on February 11, 2015
  3. physics

    A geologist finds that a Moon rock whose mass is 9.97 kg has an apparent mass of 6.40 kg when submerged in water. What is the density of the rock?

    asked on January 24, 2012
  4. Chem Oxidation-Reduction Titrations

    H2O2→ O2 + 2H+ + 2e- OCl- + 2H+ + 2e-→ H2O+ Cl- H2O2(aq) + OCl-(aq) → H2O(l) + Cl- (aq) + O2(g)Assign oxidation numbers to the following atoms: O in H2O2 ________; Cl in OCl- __________The oxidizing agent for this RedOx rxn is_____________. The

    asked on February 8, 2018
  5. Stats

    The time that it takes a randomly selected job applicant to perform a certain task has a distribution that can be approximated by a normal distribution with a mean value of 150 sec and a standard deviation of 20 sec. The fastest 10% are to be given

    asked on October 2, 2013
  6. BioChem

    In yeast, ethanol is produced from glucose under anaerobic conditions. What is the maximum amount of ethanol (in millimoles) that could theoretically be produced under the following conditions? A cell-free yeast extract is placed in a solution that

    asked on October 30, 2013
  7. Social Studies

    What was one effect of the Haymarket Riot? A) The influence of the American Federation of labor diminished B) The practice of collective-bargaining became more common C) Membership in the knights of labor grew rapidly *** D) Organized labor became less

    asked on March 6, 2017
  8. Chemistry

    To 1.0 L of a 0.38 M solution of HClO2 is added 0.18 mol of NaClO. Calculate the [HClO2] at equilibrium.

    asked on March 25, 2019
  9. chem

    a grocery store sells vinegar in 1Lbottles. based on your results, how many grams of acetic acid are in a bottle?

    asked on May 13, 2013
  10. College Chem.

    Determine the longest wavelength of light required to remove an electron from a sample of potassium metal, if the binding energy for an electron in K is 1.76 × 103 kJ/mol.

    asked on September 1, 2010
  11. physics

    A person holds a 1.42N baseball in his hand, a distance of 34.0cm from the elbow joint, as shown in the figure . The biceps, attached at a distance of 2.75cm from the elbow, exerts an upward force of 12.6N on the forearm. Consider the forearm and hand to

    asked on October 29, 2011
  12. chemistry

    how many joules are needed to completely melt 25 grams of ice at 0 degree celcius?

    asked on December 6, 2015
  13. chemistry

    Q3: In the combustion reaction of 149g of propane(C3H8) with excess oxygen, what volume of carbon dioxide(CO2) is produced at STP? (note: balance the reaction first) C3H8 + O2  3CO2 + H2O

    asked on December 8, 2013
  14. Physics

    A monatomic ideal gas expands from 1.00m^3 to 2.50m^3 st a constant pressure of 2.00x10^5 Pa. Find the change in the internal energy of the gas.

    asked on November 24, 2012
  15. chemistry

    Ammonia, NH3, is used as a refrigerant. At its boiling point of -33ºC, the enthalpy of vaporization of ammonia is 23.3 kJ/mol. How much heat is required to vaporize 125 g of ammonia at -33ºC?

    asked on May 12, 2010
  16. Biochem

    In yeast, ethanol is produced from glucose under anaerobic conditions. What is the maximum amount of ethanol (in millimoles) that could theoretically be produced under the following conditions? A cell-free yeast extract is placed in a solution that

    asked on October 30, 2013
  17. Chemistry

    1.3188g of antacid is weighed and mixed with 75.00mL of excess 0.1746M HCl. The excess acid required 27.20mL of 0.09767M of NaOH for back titration. Calculate the amount of CaCO3 in the tablet.

    asked on June 8, 2015
  18. Algebra

    For the equation 9x^2+4y^2+54x-8y+49=0 determine the center, vertices and foci?

    asked on May 4, 2015
  19. physics

    You drop a 2.3 kg textbook to a friend who stands on the ground 9 m below the textbook with outstretched hands 1.50 m above the ground. What is the speed of the textbook when it reaches the hands?

    asked on October 20, 2009
  20. chemistry

    Which substance is an electrolyte? C2H5OH C6H12O6 C12H22O11 CH3COOH

    asked on May 18, 2010
  21. Chemistry

    What is the concentration of CO3^-2 in a 0.028M solution of carbonic acid, H2CO3? For carbonic acid, Ka1=4.2x10^-7 and Ka2=4.8x10^-11

    asked on March 19, 2013
  22. Physics

    A 350 N child is in a swing that is attached to a 7.50 m long rope. find the gravitational potential energy associated with the child relative to her lowest position when a) the ropes are horizontal, (b) the ropes make a 30 degree angle with the vertical,

    asked on September 30, 2012
  23. Math

    Reno, Nevada and Salt Lake City, Utah are about 400 miles apart today. Yet 15 million years ago they were only 250 miles apart. The continental crust is being stretched by plate tectonic forces. How many inches per year do the two cities move away from

    asked on January 27, 2012
  24. astronomy

    The great galaxy in Andromeda has an angular diameter along its long axis of about 5 degree. Its distance is about 2.2 millons light years. What is its linear diameter.

    asked on March 27, 2010
  25. trig

    a propeller turns at 300 rpm. Find the angular speed in rad/sec and the linear speed at the tip if the tip to the center is 30cm

    asked on September 1, 2011
  26. differential equation

    dy/dx=(6x^2 *y^2)

    asked on May 28, 2019
  27. statistics

    any state auto insurance company took a random sample of 370 insurance claims paid out during a 1-year period. the average claim was $750 with a standard deviation of $150. find .99 confidence interval for the mean claim payment.

    asked on April 27, 2012
  28. Chemistry

    A 1.50 L buffer solution is 0.250 mol L-1 in HF and 0.250 mol L-1 in NaF. Calculate the pH of the solution after the addition of 0.0500 moles of solid NaOH. Assume no volume change upon the addition of the base. The Ka for HF is 3.5 × 10-4. Thanks in

    asked on June 21, 2015
  29. math

    Ryan estimates that he uses 2/3 cup of syrup each time he eats pancakes. How many times will he be able to eat pancakes without running out of syrup if he has a giant bottle of syrup that contains 48 cups. Do you multiply 48x2/3 and get that he will be

    asked on February 13, 2013
  30. Science

    Is the molar enthalpy of combustion of pentane the same as the molar enthalpy of formation of pentane? No. The molar enthalpy for the combustion is for the reacton C5H10 + (15/2)O2 ==> 5CO2 + 5H2O The molar enthalpy for the formaton is 5C(graphite) +

    asked on September 21, 2006
  31. physics

    blocks 1 and 2 of masses 2 kg and 4kg, respectively, are connected by a light string, as shown above. These blocks are further connected to a block of mass 3kg by another light string that passes overr a pully of negligible mass and friction. Blocks 1 and

    asked on November 13, 2012
  32. Chemistry

    How many joules of energy are needed to change 275 g of water from 15°C to steam at 100.°C?

    asked on April 3, 2013
  33. Chemistry

    What should the molar concentrations of benzoic acid and sodium benzoate be in a solution that is buffered at a pH of 4.84 and has a freezing point of -2.0 ∘C? (Assume complete dissociation of sodium benzoate and a density of 1.01 g/mL for the solution.)

    asked on April 14, 2019
  34. Chem

    A chemist was asked to find the molecular mass of a gas. She massed the gas and found that 3.73 g of the gas occupied 300 cm3 at 25°C and 92.4 kPa. What is the molecular weight of the gas?

    asked on March 28, 2008

    A bottle containing 4 kgof water at a temperature of 15°Cis placed in a refrigerator where the temperature is kept at 2°C.How much heat is transferred from the water to cool it to 2°C?

    asked on March 18, 2013
  36. Chemistry

    Calculate the enthalpy of the reaction 2B2H6 + 6O2=2B2O3 +6H2O given the following pertinent information: A. B2O3(s) + 2H2) )g) = 3O2 (g) + B2H6 (g), delta H= +2035kJ B. 2B (s) + 3H2 (g) =B2H6 (g), delta H= +36 kJ C. H2 (g) + 1/2)2 (g) =H2O (l), delta

    asked on April 22, 2012
  37. calculus

    A freshly brewed cup of coffee has temperature 95°C in a 20°C room. When its temperature is 71°C, it is cooling at a rate of 1°C per minute. When does this occur?

    asked on June 9, 2019
  38. chemistry

    If He(g) has an average kinetic energy of 7590 J/mol under certain conditions, what is the root mean square speed of F2(g) molecules under the same conditions?

    asked on September 28, 2014
  39. math

    A recycling center pays 25 cents per aluminum can recycled at its facility. If Tracy recycles 5 aluminum cans there, how many dollars will she earn?

    asked on April 29, 2018
  40. math-linear equations

    Its a story problem: The flying W Ranch raises only cows and horses. There are total 340 animals. The owner prefers horses to cows, so he has 52 more horses than cows. a. Write two different linear equations to model this situation. b. Solve the system of

    asked on January 19, 2016
  41. chemistry

    Aluminum granules are a component of some drain cleaners because they react with sodium hydroxide to release both energy and gas bubbles to help clear the drain clog. The reaction is: 2NaOH + Al + 6H2O  2NaAl(OH)4 + 3H2 (note: balance the reaction

    asked on December 8, 2013
  42. Chemistry

    What is the hydroxide ion concentration of a 0.370M oxalic acid, H2C2O4, solution? For oxalic acid, Ka1=5.6x10^-2 and Ka2=5.1x10^-5

    asked on March 19, 2013
  43. biology

    Comparisons of amino acid sequences from different organisms often shed light on the evolutionary divergence of related species. Would you expect all of the proteins of a given set of living species to show the same degree of divergence?

    asked on April 18, 2010
  44. English IV

    Help Please! Choose the function of the italicized infinitive phrase shown below. (stars indicate italicized infinitive phrase) Meridith is *to be restored as captain.* Answer Options: Function of infinitive: Adjective, Adverb, or Noun. (I chose adverb &

    asked on February 20, 2014
  45. Chemistry

    (a)What is the bond order of the diatomic molecule BN? (b) Is BN paramagnetic? (c) Rank the following compounds in order of increasing bond energy: B2, N2, BN. (d) Rank the following compounds in order of increasing bond length: B2, N2, BN.

    asked on November 18, 2012
  46. Physics

    Car A is traveling at 18 m/s and car B at 25 m/s. Car A is 300m behind car B when the driver of Car A accelerates his car with an acceleration of 1.80m/s^2. How long does it take car A to overtake car B?

    asked on January 8, 2013
  47. calculus

    A Norman window has the shape of a rectangle surmounted by a semicircle as in the figure below. If the perimeter of the window is 37 ft, express the area, A, as a function of the width, x, of the window. How do you do this problem?

    asked on September 18, 2010
  48. Chemistry

    How many kilojoules of energy are needed to convert 104 g of ice at -14.6 to water at 25.8°C? (The specific heat of ice at -14.6 is 2.01 J/g°C.)

    asked on April 4, 2013
  49. CHEM

    Which of the following mixtures will result in the formation of a buffer solution when dissolved in 1.00 L of water? i) 0.50 mol NaOH and 0.50 mol HCl. ii) 0.50 mol NaCl and 0.25 mol HCl. iii) 0.50 mol NaF and 0.25 mol HF. iv) 0.50 mol NaOH and 0.25 mol

    asked on July 23, 2010
  50. math

    ABCD is a rectangle. If AC = 2(5a + 1) and BD = 2(a + 1), find the length of each diagonal.

    asked on May 9, 2014
  51. chemistry

    What volume of carbon monoxide gas (at STP) is needed when 1.31 moles of oxygen gas react completely in the following equation? 2 CO + O2 --> 2 CO2

    asked on November 10, 2013
  52. physics

    Search: The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.029 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.049 kg and is initially at

    asked on April 20, 2011
  53. Physics

    A mountain-climbing expedition establishes two intermediate camps, labeled A and B in the drawing, above the base camp. What is the magnitude Δr of the displacement between camp A and camp B?

    asked on January 31, 2013
  54. Chem

    how to prepare a 250 mL solution of .15 M K2SO4 with a volumetric flask

    asked on January 15, 2013
  55. Physics

    At the beginning of a new school term, a student moves a box of books by attaching a rope to the box and pulling with a force of 92 N at an angle of 30 as shown in the figure below. The box of books has a mass of 22.0 kg, and the coefficient of kinetic

    asked on November 5, 2012
  56. math

    A box contains four red, three blue, and six green lenses. Two lenses are randomly selected from the box. Find the probability of getting two red lenses when two are selected if the first selection is NOT replaced before the second selection is made.

    asked on March 3, 2013
  57. Algebra

    Michael invested his savings in two investment funds. The amount he invested in Fund A was $2,000 less than the amount he invested in Fund B. Fund A returned a 4% profit and Fund B returned a 3% profit. How much did he invest in Fund A, if the total profit

    asked on March 19, 2011
  58. astronomy

    A light bulb radiates most strongly at a wavelength of about 3000 nanometers. How hot is its filament?

    asked on March 27, 2010
  59. Algebra

    Renee is twice as old as Dana. Four years ago Renee was three times as old as Dana. How old are Renee and Dana now? Show Work

    asked on April 27, 2015
  60. business

    . You've written a check to Goodwill Supply, and the check has been lost. What should you do? A. Stop payment on the first check; then write a second one. B. Send a counter check to Goodwill. C. Write another check immediately. D. Call Goodwill and tell

    asked on September 22, 2014
  61. Chem.

    At equilibrium, the concentrations in this system were found to be [N2]=[O2]=0.200 M and [NO]=0.500 M. N2 + O2= 2NO If more NO is added, bringing its concentration to 0.800 M, what will the final concentration of NO be after equilibrium is re-established?

    asked on April 1, 2014
  62. physics

    Search: The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.029 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.049 kg and is initially at

    asked on April 20, 2011
  63. Chemistry

    A sample gas has a volume of 200 cm^3 at 25 degrees celsius and 700 mmHg. If the pressure is reduced to 280 mmHg, what volume would the gas occupy at the same temperature?

    asked on April 4, 2011
  64. math-story prob

    The total cost of gift baskets include the cost of each basket and a one time delivery fee. The cost of the basket is the same regardless of how many the customers orders. One company bought 40 baskets for a total of $715 and another company bought 400

    asked on January 25, 2016
  65. chemistry

    Q2: A sample of carbon dioxide(CO2) has a mass of 55g and occupies 3.3L at 100C. What pressure does the gas exert (in kPa)?

    asked on December 8, 2013
  66. math

    what is 14.76 rounded to the nearest hundredth?

    asked on November 16, 2012
  67. office

    Which of the following organizations would most likely use an unabridged dictionary? A. The English department at a large university B. An automotive dealership C. A large retail department store D. A pediatrics hospita

    asked on September 19, 2014
  68. Physics

    A brick that weighs 23 kg is laying on a table. The brick is retained. From the brick, a thread is connected via a castor to a weight with the mass of 19 kg. With how much force do the thread effect the hanging weight if you release the brick. Coefficient

    asked on October 8, 2017
  69. math-story prob

    Please help: The total cost of gift baskets include the cost of each basket and a one time delivery fee. One company bought 40 baskets for a total of $715 and another company bought 400 baskets for $5,935. What is the cost per basket? What is the cost for

    asked on January 25, 2016
  70. Chemistry

    Calculate the volume of solution that has a vapour pressure of 31.27 mbar and contains 84.3g of sucrose, at a temperature of 25.0C. The vapour pressure of pure water at 25.0C is 31.7mbar, the density of water is 1.00g/mL, and assume no change in volume

    asked on July 3, 2015
  71. Chemistry

    Calculate the [H+] for: black coffee with a pH of 6.9 (Enter your answer as follows: 1.0E-2 for 0.010)

    asked on April 19, 2013
  72. Physics

    Suppose you have 100 g of radioactive plutonium-239 with a half-life of 24,000 years. How many grams will remain after (a) 12,000 years (b) 24,000 years (c) 96,000 years?

    asked on September 2, 2012
  73. Chemistry

    Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3(s)--> 2K2O(s) + 2N2(g) + 5O2(g) To produce 56.6 kg of oxygen, how many (a) moles of KNO3 must be heated? (b) Grams of KNO3 must must heated?

    asked on June 17, 2012
  74. physics

    Two students are on a balcony 18.3 m above the street. One student throws a ball (ball 1) vertically downward at 12.2 m/s; at the same instant, the other student throws a ball (ball 2) vertically upward at the same speed. The second ball just misses the

    asked on August 29, 2011
  75. Chemistry

    Consider 125 mL of 0.110 M MgCl2 solution. a. How many moles of MgCl2 are contained in 125 mL of 0.0110 M MgCl2? b. What is the concentration of Mg2+ ion? c. What is the concentration of Cl- ion?

    asked on April 4, 2011
  76. Chemistry

    What is the heat capacity of 190g of liquid water? I came up with 794.96 but it says my sig figs are wrong? Help?????

    asked on May 19, 2010
  77. chemistry

    The thermite reaction is a very exothermic reaction; it has been used to produce liquid iron for welding. A mixture of 2 mol of powdered aluminum metal and 1 mol of iron(III) oxide yields liquid iron and solid aluminum oxide. How many grams of the mixture

    asked on December 13, 2009
  78. social studies

    In Jonathan Swift's "A Modest Proposal" help me to discuss how it relates to the issues of proverty, depravity, and suffering that plagued English society even in the face of human progress idealized during the Age of Enlightment. Thanks!!

    asked on November 28, 2009
  79. Physics

    A mass is thrown upwards with an initial velocity of 30m/s. A second mass is dropped from directly above, a height of 60m from the first mass 0.50s later. When do the masses meet and how hight is the point where they meet?

    asked on October 11, 2009

    a lump of lead with mass 0.50kg is dropped...

    asked on October 23, 2018
  81. math (stats)

    Enter your answers as decimals or fractions, rather than percents. In a family with 7 children what is the probability of having 4 boys and then 3 girls, in that order? (Exclude multiple births and assume all outcomes are equally likely). Preview In a

    asked on October 2, 2016
  82. Physics- Optics

    A double lens system is made of +35.0 cm lens (lens #1) and a - 26.0 cm lens (lens #2). Lens #1 is placed at x = 0 cm on a meter stick and lens #2 is placed at x = 30.0 cm. Where on the meter stick will the final image be formed when looking at a distant

    asked on April 5, 2016
  83. Chemistry

    Determine how many milliliters of 0.370 M HClO4 will be required to neutralize 58.99 g Ca(OH)2 according to the reaction: 2HC1O4+Ca(OH)2>CaC1O4)2+2H2O How would I set this up?

    asked on April 19, 2013
  84. grammar

    I expect a friend to be both honest and a loyal person.

    asked on October 29, 2012
  85. Math - Statistics

    Eight people in a room have an average height of 66 inches. A ninth person enters the room. How tall would he have to be to raise the average height by 0.5 inches?

    asked on January 24, 2012
  86. geometry

    if b is between a and c find the value of x and the measure of bc (ab=3x,bc=5x,ac=8)

    asked on November 19, 2010
  87. psychology

    Post a 200- to 300-word response to the following: Describe the stages of sleep. In which stage do we dream? What are the five common beliefs about dreaming? What are the two common theories about dreams?

    asked on July 28, 2010

    A mass is thrown upwards with an initial velocity of 30m/s. A second mass is dropped from directly above, a height of 60m from the first mass 0.50s later. When do the masses meet and how hight is the point where they meet? I NEED TO KNOW HOW TO SHOW THIS

    asked on October 11, 2009
  89. chemistry

    269 mL of a 0.2089 M sodium carbonate (Na2CO3) solution is prepared and labelled "Solution A".

    asked on March 22, 2015
  90. Physics help please!

    1. Given t1/2 to be 0.0137 seconds, how long should it take to reach 87.5% of maximum charge? 2. Let's say you measure t1/2 to be 0.0137 seconds and the resistance in the circuit is 99 Ohms. Then what is the capacitance in micro Farads? 3.q = qmax(1 - e -t

    asked on March 10, 2015
  91. math

    Estimate each quotient 535.6/35?

    asked on November 27, 2012
  92. physics

    A kettle heats up 1.5L of water from 22 degreesC to 90 degreesC in 4 min. What power did the water receive?

    asked on November 19, 2010
  93. math


    asked on September 30, 2010
  94. Astronomy

    Retrograde motion describe the A backward motion of the stars relative to Earth B uniform circular motion exhibited by the planets C irregular speeds at which the planet travel. D backward motion of the planets with respect to the stars I think the answer

    asked on March 28, 2010
  95. Math

    6+4•5+3=80 insert grouping symbols so that the expression has the desired value

    asked on March 12, 2018
  96. Math

    600,000. = _ ten thousands

    asked on November 16, 2016
  97. Algebra

    Use a graphing utility to approximate the real solutions if any, of the given equation rounded to two decimal places. x^3-9x+1=0

    asked on September 17, 2014
  98. Chemistry:Important!!!!!!!

    A student begins with 9.7 mL of a 0.26 M Cu(NO3)2 solution and performs copper cycle lab. She recovers 0.075 grams of copper metal. A) What is the Theoretical Yield B) What is the Actual Yield C) What is the Percent Yield

    asked on February 10, 2014
  99. fractions

    a recipe calls for 1/4 teaspoon of salt. to make three times the amount how much salt is needed?

    asked on September 24, 2013
  100. Chemistry

    The specific heat of zinc is 0.096 cal/(g °C). Determine the energy required to raise the temperature of 26.1 g of zinc from room temperature (20.0 °C) to 150 °C.

    asked on April 3, 2013


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