Most popular questions and responses by jennifer
  1. Chemistry

    What is the name of the product formed by the reaction of propylide ion and 2-chloropropane? I'm having problem because I don't know the formula of propylide ion.

    asked on June 5, 2008
  2. Physics

    You are walking around your neighborhood and you see a child on top of a roof of a building kick a soccer ball. The soccer ball is kicked at 41° from the edge of the building with an initial velocity of 21 m/s and lands 59 meters away from the wall. How

    asked on October 10, 2013
  3. Chemistry


    asked on March 7, 2017
  4. math help

    I am a closed shape made of 6 line segments. I have 2 angles less than a right angle and no right angles. What shape am I? Draw an example in the workspace.

    asked on March 19, 2014
  5. Calculus

    An OPEN box has a square base and a volume of 108 cubic inches and is constructed from a tin sheet. Find the dimensions of the box, assuming a minimum amount of material is used in it's construction. HINT: the goal is to minimize the surface are of the

    asked on May 14, 2013
  6. Math

    Radioactive​ uranium-235 has a​ half-life of about 700 million years. Suppose you find a rock and chemical analysis tells you that only one sixteenth of the​ rock's original​ uranium-235 remains. How old is the​ rock?

    asked on September 25, 2018
  7. Physics HELP!

    A 650 N boy and a 490 N girl sit on a 150 N porch swing that is 1.70 m long. If the swing is supported by a chain at each end, what is the tension in each chain when the boy sits .75 m from one end and the girl .5 m from the other end?

    asked on December 5, 2010
  8. chemistry

    During the combustion of 5.00g of octane C8H18, 239.5 kcal is released. Write a balanced equation for the combustion reaction. Are reactants or products favored? What is the sign of change of heat for this reaction? how much energy is released by the

    asked on June 7, 2015
  9. Math

    Three individuals form a partnership and agree to divide the profits equally. X invests $4,500, Y invests $3,500 and Z invests $2,000. If the profits are $1,500, how much less does X receive than if the profits were divided in proportion to the amount

    asked on April 25, 2012
  10. Fractions

    lisa's dog has 4 squeaky toys. two thirds of the dog's toys are squeaky toys. how many dog toys does lisa's dog have in all?

    asked on January 24, 2014
  11. Life orientation

    List two ways in which sport can support nation building

    asked on March 20, 2015
  12. Chemistry

    Write a balance equation for the reaction of nitric acid (HNO3) with each base solution : [1]. NaHCO3, [2]. MgCO3. ( Please include the phases of the substance)

    asked on December 8, 2012
  13. college chemistry

    When ammonium carbonate decomposes, what would happen to a glowing splint in the presence of the gases that are evolved. Explain

    asked on April 3, 2011
  14. AP calculus AB

    A spy tracks a rocket through a telescope to determine its velocity. The rocket is traveling vertically from a launching pad located 10 km away. At a certain moment, the spy's instruments show that the angle between the telescope and the ground is equal to

    asked on December 29, 2010
  15. Trig

    From a point A on the ground, the angle of elevation to the top of a tall building is 24.1 degrees. From a point B, which is 600 ft closer to the building, the angle of elevation is measured to be 30.2 degrees. Find the height of the building. PLEASE HELP

    asked on November 11, 2009
  16. Math

    The path of a satellite orbiting the earth causes it to pass directly over two tracking stations A and B, which are 35 mi apart. When the satellite is on one side of the two stations, the angles of elevation at A and B are measured to be 87.0° and 84.2°,

    asked on June 22, 2016
  17. physics

    The 100 kg block in figure takes 7.00s to reach the floor after being released from rest. What is the mass of the block on the left?

    asked on September 26, 2008
  18. chemistry


    asked on June 7, 2015
  19. physics

    An electron ( mass = 9.11×10−31 kg) leaves one end of a TV picture tube with zero initial speed and travels in a straight line to the accelerating grid, which is 1.85 cm away. It reaches the grid with a speed of 2.95×10^6 m/s . (You can ignore the

    asked on May 19, 2012

    A 0.445 kg ice puck, moving east with a speed of 2.82 m/s, has a head-on collision with a 0.918 kg puck initially at rest. Assuming a perfectly elastic collision, what will be the speed and direction of each object after the collision? speed of the ice

    asked on October 31, 2009
  21. 2nd grade/math

    How do you find the perimeter of a letter, example I, U, and J? The area for the I is 9 square cm. Do you still count all the sides or what? Any help would be appreciated!

    asked on March 8, 2011
  22. Physics

    A 4.5-kg brick is suspended by a light string from a 2.0-kg pulley. The brick is released from rest and falls to the floor below. The pulley may be considered a solid disk of radius 1.5 m. What is the linear acceleration of the brick and the tension in the

    asked on March 23, 2015
  23. Physics

    A 31.5 N object is in free fall. What is the magnitude of the net force which acts on the object? Answer in units of N

    asked on December 4, 2014
  24. Impulse and Momentum

    A bullet of mass m is fired at speed v0 into a wooden block of mass M. The bullet instantaneously comes to rest in the block. The block with the embedded bullet slides along a horizontal surface with a coefficient of kinetic friction . What is the

    asked on March 1, 2015
  25. physics

    Satellite A orbits a planet with a speed of 10,000 m/s. Satellite B is twice as massive as satellite A and orbits at twice the distance from the center of the planet. What is Satellite B's speed?

    asked on October 2, 2008
  26. AP calculus AB

    At the instant when the radius of a cone is 3 inches, the volume of the cone is increasing at the rate of 9 pi cubic inches per minute. If the height is always 3 times the radius, find the rate of change of the radius at that instant.

    asked on December 29, 2010
  27. Chem

    Could someone please walk me through step by step on how to do this. Propane (C3H8) burns in oxygen to produce carbon dioxide and water. C3H8(g) + 5 O2(g) 3 CO2(g) + 4 H2O(g) Calculate the mass of CO2 that can be produced if the reaction of 48.2 g propane

    asked on October 7, 2010
  28. math

    I am a multiple of 10. Factors include an even number and an odd number. Greater than 15 and less than 28. What number am I?

    asked on November 11, 2015
  29. math

    Mark wants to use a grid to model 2/3 like the grids in questions 1 and 2. Its a 100 box grid . help

    asked on December 18, 2017
  30. Math

    What effect will an outlier have on a confidence interval that is based on a small sample size? A) The interval will be smaller than an interval without the outlier. B) The interval will be the same with or without the outlier. C) The confidence interval

    asked on November 28, 2009
  31. Chemistry

    I am so overwhelmed. can somebody please help me? Consider a solution that is 0.022 M in Fe^2+ and 0.014 in Mg^2+ A) if K2CO3 is to selectively precipitate one of the cations while leaving the other cation in solution, which cation will precipitate first?

    asked on April 1, 2013
  32. Calculus

    A large container has the shape of a frustum of a cone with top radius 5 m, bottom radius 3m, and height 12m. The container is being filled with water at the constant rate 4.9 m^3/min. At what rate is the level of water rising at the instant the water is 2

    asked on November 7, 2014
  33. Physics

    A 10N meterstick is suspended by two sping scales, one at the .08 m mark and the other at the .9 m mark. If a weight of 5N is hung at the .2 m mark and a weight of 17N is hung at the .55 m mark, what will be the reading on each scale? I have:

    asked on December 8, 2010
  34. Math

    A state university wants to increase its retention rate of 4% for graduating students from the previous year. After implementing several new programs during the last two years, the university reevaluated its retention rate. Identify the Type I error in

    asked on December 5, 2009
  35. Math

    The maximum weight M that can be supported by a beam is jointly proportional to its width w and the square of its height h, and inversely proportional to its length L. a. Write an equation that expresses this prportionality b. Determine the constant of

    asked on March 20, 2010

    Mg(s) + FeCl2(aq) → MgCl2(aq) + Fe(s). IS THE IRON(II) ION OXIDIZED?

    asked on February 22, 2017
  37. algebra

    can you check my answers please? What are the first three terms of the sequence: a1 = 3 and an = 2(an1)2? 2, 8, 18 3, 18, 648 --3, 32, 50 2, 6, 12, 24 What is the 14th term in the sequence: an = 4n + 13? -43 43 __> -69 69 What is the recursive rule for the

    asked on March 22, 2012

    *Consider a 0.15 m strontium chloride aqueous solution. a. Determine the molality (in m) of all solutes in the solution. Assume that strontium chloride completely ionizes when dissolved in water. All solutes means all cations and anions. The molality that

    asked on March 3, 2017
  39. literature

    why is the poem "Fable for when there's no way out" a good example of "seeing common things in an uncommon way?"

    asked on March 30, 2015
  40. Science

    If you walk 20m, took a book from a library table, turned around, walked back to your seat. What are the distance and displacement travel by you? What are the distance and displacement traveled by the book?

    asked on February 21, 2008
  41. Science

    You pull a door open. If the force the door exerts on you is equal to the force you exert on the door, why don't you move?

    asked on March 24, 2008
  42. math

    Allan borrowed $4800 from his father to buy a car. He repaid him after 9 months with interest of 5% per year. Find the total amount he repaid.

    asked on June 24, 2014
  43. Algebra

    What are the foci of the hyperbola with equation 16y^2-9x^2=144

    asked on May 19, 2014
  44. Chemistry

    N2(g) + 3 H2(g) → 2 NH3(g) [balanced] If 5.42 g of nitrogen gas are reacted with 5.42 g of hydrogen gas, which of the reactants is the limiting reactant? Use the molar mass data below if necessary. Molar mass of N2 = 28.02 g/mol Molar mass of H2 = 2.02

    asked on February 20, 2017
  45. physics

    A motorcycle, which has an initial linear speed of 6.6 m/s, decelerates to a speed of 2.1 m/s in 5.0 s. Each wheel has a radius of 0.65 m and is rotating in a counterclockwise (positive) direction. What are a) the constant angular acceleration (in rad/s^2)

    asked on March 9, 2015
  46. math

    A projectile is launched vertically upward from the top of a 240-foot building. This translates to the model y = -16t^2 + 32t + 240 where y is the height in feet and t is the time in seconds after it was launched, When will the projectile hit the ground?

    asked on September 25, 2008
  47. Math

    We can find the solutions of sin x = 0.6 algebraically. (Round your answers to two decimal places.) (a) First we find the solutions in the interval [0, 2π). We get one such solution by taking sin−1 to get x = ________ (smaller value). The other solution

    asked on April 21, 2016
  48. literature

    what lines show alliterations in the poem "Fable for when there's no way out"

    asked on March 30, 2015
  49. physics

    Assuming the Earth's magnetic field averages about 0.50×10−4 T near Earth's surface, estimate the total energy stored in this field in the first 15km above Earth's surface. The radius of Earth is 6380 km.

    asked on March 23, 2014
  50. Survey of Math

    A math class contains 7 females (three of whom speak French and the rest speak only English),and 12 males (two of whom speak French and the rest speak only English). a) A student in the class is chosen at random. If you're told the student is female, what

    asked on February 1, 2018
  51. Math

    Jasmine has taken an online boating safety course and is now completing her end of course exam. As she answers each question.,the progrss bar at the bottom She has just completed question 16 and the test bar how she is 20% of questions. How many total

    asked on October 29, 2013
  52. Mathematics

    Tito Sanchez receives a weekly salary of $400. he also receives a 6% commission on the total dollar amount of all sales he makes. What must his total sales be in a week if he is to make a total of $790?

    asked on September 25, 2012
  53. Biology

    The half life of carbon 14 is 5700 years. If the carbon 14 level measured in a fossilized bone has only 1/4 of the original amount, how old in the bone?

    asked on May 16, 2011
  54. Math

    Six neighbors share four pies equally how much of a pie does each neighbor get

    asked on January 28, 2019
  55. Pre-Cal

    A 13-ft ladder leans against a building so that the angle between the ground and the ladder is 63 degrees. How high does the ladder reach on the building? (round your answer to the nearest foot)

    asked on June 15, 2016
  56. math

    All 30 of the students in a mathematics class attended class on Monday. On Tuesday only 22 students attended. What was the percent decrease?

    asked on June 24, 2014
  57. Algebra 2

    1. A bag contains 12 red checkers and 6 black checkers. You will randomly select two checkers, one at a time, without replacement. (a) In how many ways can you select two checkers so that at least one of the checkers is red? List the ways. (b) What is the

    asked on September 14, 2015
  58. economics

    The hand made snuffbox industry is composed of 100 identical firms, each having short-run total costs given by STC=0.5q^2+10q+5 and short-run marginal costs by SMC=q+10 where q is the output of snuffboxes per day. a. What is the short-run supply curve for

    asked on November 3, 2007
  59. chemistry

    for N2O4(g)->

    asked on June 7, 2015
  60. Finance

    Joshua borrowed $2,300 for one year and paid $138 in interest. The bank charged him an $15 service charge. If Joshua paid the $2,300 in 12 equal monthly payments, what is the APR? (Round your answer to 1 decimal place

    asked on February 15, 2013
  61. chemistry

    How many grams of dry NH4Cl need to be added to 2.00L of a 0.100M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.86? Kb for ammonia is 1.8×10−5.

    asked on April 22, 2014
  62. Algebra

    you trim a large square picture so that you could fit it into a frame. you trim 3 inches from the length and 2 inches from the width. the area of the resulting picture is 56sq in what was the perimeter of the original large square picture?

    asked on March 12, 2013
  63. Cypress

    Suggest any limitations to the use of recrystallization as a purification method for a solid.

    asked on September 6, 2011
  64. animal science

    Which of the following is true of the function of glucagon? A. Glucagon regulates insulin secretion. B. Glucagon increases glycogen breakdown into glucose. C. Glucagon inhibits glycogen breakdown into gluclose. D. Glucagon regulates somatostatin secretion.

    asked on August 15, 2012
  65. chemistry

    THE QUESTION ASKS TO CALCULATE THE AMOUNT (IN GRAMS) OF CARBON DIOXIDE FROM THE AMOUNT OF SODIUM BICARBONATE THAT YOU USED IN THE REACTION Run 1. The reaction of citric acid and sodium bicarbonate is written as H3C6H5O7(aq) + 3 NaHCO3(aq) → Na3C6H5O7(aq)

    asked on February 28, 2017
  66. physics

    a) If a photon and an electron each have the same energy of 20.0 eV, find the wavelength of each. b) If a photon and an electron each have the same wavelength of 250 nm, find the energy of each. c) You want to study an organic molecule that is about 250 nm

    asked on April 5, 2011
  67. Finance

    Molly just received a $5,000 inheritance. She wants to open an IRA for retirement, 40 years from today. If she can earn 11% per year in her IRA, how much will she be able to take out annually for 20 years in retirement? A) $24,182 B) $35,041 C) $16,250 D)

    asked on December 16, 2018
  68. chemistry

    what is the freezing point of a solution that contains 20.2g of urea CO(NH2)2 in 295mL water? Assume a density of water of 1.00g/mL

    asked on June 14, 2015
  69. general science

    A Compound Containing 3 Atoms Of Carbon And 8 Atoms Of Hydrogen Is Combined In A Reaction With Oxygen Molecules. The Two End Products Of This Equation Are Carbon Dioxide And Water. What Element Should You Look At First In Balancing This Equation?

    asked on August 9, 2009
  70. Impulse and Momentum

    A 1400-kg car traveling east at 25m/s collides with a 1800-kg car traveling at a speed of 20m/s in a direction that makes angle of 40degree south of west. The cars stick together after the collision. What is the magnitude and direction of the velocity of

    asked on March 1, 2015
  71. Chemistry

    A sample of 10.7 g of O2 reacts completely with CO to form CO2. 2 CO + O2 → 2 CO2. How many grams of CO is required.

    asked on February 20, 2017
  72. apush

    how could trusts purchase a senate seat in the late nineteenth century? what bias did the founding fathers demostarte in their procedure for electing senators?

    asked on November 11, 2009
  73. Math

    Answers for A clock was exactly on time at noon on Monday. At 2 P.M. on Wednesday, it was 25 seconds slow. At that same rate, how much did it lose in 1/2 hour?

    asked on April 25, 2012
  74. Chemistry

    How many molecules of Cl2 would be formed from the reaction mixture that produces the greatest amount of products? 4HCl + O2 --> 2H2O + 2Cl

    asked on October 3, 2010
  75. Science

    A box being pushed with a force of 85N slides along the floor with a constant speed. What is the force of sliding friction on the box?

    asked on March 24, 2008
  76. Science

    A geologists working in a national park finds a mineral he is carrying a kit that contains a penny, a hand lens, a piece of tile, a geologic hammer, and a jackknife. Describe how the geologists can use these items to determine some of the minerals

    asked on February 9, 2017
  77. MATH

    Travel Time A company president flew 680 miles one way in the corporate jet but returned in a smaller plane that could fly only half as fast. If the total travel time was 6 hours, find the speeds of the planes. how would I set up this problem?

    asked on September 25, 2008
  78. phyiscs

    Water flows through a 4 cm diameter garden hose at a velocity of 2 m/s. What is the velocity of the water if a nozzle is used with a diameter of 0.5 cm? please help..thanks in advanced

    asked on April 16, 2015
  79. physics

    A ball is thrown straight upward and returns to the thrower's hand after 2.20 s in the air. A second ball is thrown at an angle of 31.0° with the horizontal. At what speed must the second ball be thrown so that it reaches the same height as the one thrown

    asked on November 18, 2010
  80. chemistry

    methanol CH3OH is used as race car fuel write the balanced equation for the combustion of methanol. change in heat= -174kcal/mol methanol for the process How man kilocal are released u burning 33.0g of methanol

    asked on June 7, 2015
  81. Chemistry

    If 325mL of a 0.58 M solution of a propanoic acid (a fatty acid) was mixed with excess glycerol what is, the maximum number of molecules of fat or oil that could result?(you will need Avogadros number = 6.022 X 10 to the 23rd power)....I need to show all

    asked on December 3, 2014
  82. chem

    "Yule logs are simulated wood logs make of compressed paper that burn with a red and green flame.How would you produce a similar yule log?"

    asked on July 9, 2008
  83. physics

    The sun has a mass of 1.99 × 1030 kg and is moving in a circular orbit about the center of our galaxy, the Milky Way. The radius of the orbit is 2.3 × 104 light-years (1 light-year = 9.5 × 1015 m), and the angular speed of the sun is 1.1 × 10-15 rad/s.

    asked on March 9, 2015
  84. Statistic 103

    The average teachers salary in Connecticut( ranked first among states) is $57,337. suppose that the distribution of salaries is normal with a standard deviation of $7500. What is the probability that a randomaly selected teacher makes less than $52,000 per

    asked on April 13, 2011
  85. Finance

    Sam wants to start saving for retirement. She wants to have $85,000 per year for 25 years in retirement that will start in 40 years. How much must she deposit in equal annual amounts for the next 20 years if she can earn 9% over the life of her investment?

    asked on December 16, 2018
  86. physics

    In the Atwood's machine of Figure 8-23, the two masses shown are initially at rest at the same height. After they are released, the large mass, m2, falls through a height h and hits the floor, and the small mass, m1, rises through a height h. The mass m2

    asked on March 31, 2011
  87. chemistry

    how many grams of methanol must be added to 5.00kg of water to lower its freezing point to -12.0 degrees C? for each mole of solute the freezing point of 1kg of water is lowered 1.86 degrees C?

    asked on June 14, 2015
  88. Physics

    A cue ball traveling at 0.70 m/!@#$%^&s a stationary 8-ball, which moves off with a speed of 0.23 m/s at an angle of 39° relative to the cue ball's initial direction. Assuming that the balls have equal masses and the collision is inelastic, at what angle

    asked on March 5, 2015
  89. Math

    Marginal revenue the weekly revenue from the sale of emeralds at Eduardo’s Emerald Emporium (EEE) is decreasing at a rate of $500 per $1 increase in price and the price is decreasing at a rate of $0.45 per additional emerald sold. What is the marginal

    asked on October 21, 2014
  90. Chemistry

    Which of the following molecules has the highest boiling point? CH4,BH3,NH3, SH2?

    asked on October 7, 2012
  91. Physics

    A house painter is standing on a uniform, horizontal platform that is held in equilibrium by two cables attached to supports on the roof. The painter has a mass of 75 kg and the mass of the platform is 20.0 kg. The distance from the left end of the

    asked on October 28, 2010
  92. I just posted chinese!!

    um, i don't think it appears really well on my monitor (is it just mine or...) if you can't see it, could you please give me your email add so that i can email it to you and you can check the mistakes? please help me...

    asked on January 26, 2009
  93. math

    James has set up an ordinary annuity to save for his retirement in 18 years. If his monthly payments are $225 and the annuity has an annual interest rate of 8% compounded monthly, what will be the value of the annuity when he retires?

    asked on June 24, 2014
  94. calculus

    A large container has the shape of a frustum of a cone with top radius 5 m, bottom radius 3m, and height 12m. The container is being filled with water at the constant rate 4.9 m^3/min. At what rate is the level of water rising at the instant the water is 2

    asked on November 8, 2014
  95. Chemistry (Stoichiometry)

    Heres a balanced equation: Na2CO3(aq)+2AgNO3 (aq) --> 2NaNO3(aq)+Ag2CO3 (s) From this equation, 10 mL of AgNO3 in this contains 34 grams of AgNO3. Calculate the grams of solid product, Ag2CO3. Part 2: 10 mL of Na2CO3 in this experiment contains 21 grams of

    asked on February 6, 2013
  96. Chemistry

    Determine the type of radiation: a frequency of 5.6 mhz

    asked on October 19, 2010
  97. intermediate algebra

    A projectile is launched directly upward from the top of a 112 - foot building with an initial velocity (speed) of 96 feet per second. This translates to the h(t) = -16t^2 + 96t + 112 where h(t) is the height of the projectile in feet and t is the time in

    asked on November 6, 2008
  98. Physics

    A hobby rocket reaches a height of 72.3 m and lands 111 m from the launch point.What is the angle of launch? What is the launch speed?

    asked on September 10, 2008
  99. Math 8

    write an algebraic expression for the nth term of this sequence. 7, 11, 16, 22,... I know what algebraic expression is.

    asked on November 8, 2018
  100. Statistics

    Roulette wheels in Nevada have 38 pockets. They are all numbered 0, 00, and 1 through 36. Of all 38 pockets, there are 18 red, 18 are black, and 2 are green. Each time the wheel is spun, a ball lands in one of the pockets, and each pocket is equally

    asked on April 7, 2016


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