Most popular questions and responses by liz
  1. Chemistry

    Metallic aluminum reacts with MnO2 at elevated temperatures to form manganese metal and aluminum oxide. A mixture of the two reactants is 67.2% mole percent Al. Find the theoretical yield (in grams) of manganese from the reaction of 240 g of this mixture.

    asked on October 8, 2009
  2. Chemistry II

    Arrange the following 0.10M solutions in order of increasing pH: a. Nacl b. NH4CL C. HCL D. NaCH3CO2 e. KOH

    asked on April 30, 2013
  3. Trigonometry

    A communications tower is located at the top of a steep hill, as shown. The angle of inclination of the hill is 58°. A guy wire is to be attached to the top of the tower and to the ground, 50 m downhill from the base of the tower. The angle α in the

    asked on October 1, 2014
  4. physics

    A baseball is tossed at a steep angle into the air and makes a smooth parabolic path. Its time in the air is t and it reaches a maximum height h. Assume that air resistance is negligible. a.) Show that the height reached by the ball is gt2 (square) /8. b.)

    asked on March 30, 2012
  5. calc

    Nutrition Ruff, Inc. makes dog food out of chicken and grain. Chicken has 10 grams of protein and 5 grams of fat per ounce, and grain has 2 grams of protein and 2 grams of fat per ounce. A bag of dog food must contain at least 224 grams of protein and at

    asked on September 16, 2011
  6. word problem

    If equal amounts of heat are added to equal masses of silver and copper, both at the same initial temperature, which will reach the higher final temperature? Explain your answer. The specific heat capacity of silver is 0.235 J/g degree Celsius and that of

    asked on April 12, 2014

    An internal explosion breaks an object, initially at rest, into two pieces. One piece (m1) is 1.5 times more massive than the other (m2). If 7500 J were released by the explosion, how much KE did each piece acquire?

    asked on October 22, 2014
  8. physics

    What pressure difference is required between the ends of a 2.0--long, 1.0--diameter horizontal tube for 40 water to flow through it at an average speed of 4.0 ? I know we have to find delta P, but i'm stuck on how to do that. Help would be great

    asked on April 12, 2011
  9. Math

    Which set of integers are in the right order from least to greatest? A. -8,8,6,|-7|,5 B. |-7|,-8,8,6,5 C. -8,5,6,|-7|,8 D. 5,6,8,-8,|-7| Is the answer b? Thank you

    asked on August 21, 2015
  10. physics

    Suppose a 65-kg boy and a 45-kg girl use a massless rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl.

    asked on October 28, 2009
  11. History

    Which number labels Yasmin's native country of Spain? A 1 B 2 C 4 D 6 Which number labels Yasmin's current home in Sweden? A 1 B 3 C 4 D 5 (I am new also :))

    asked on March 31, 2017
  12. Chemistry

    I did a lab on vinegar and titration. The question asks.. In the titration of acetic acid and NaOH the use of the color indicator mandates that excess base be present to detect the reading endpoint. Will this cause the calculated and reported mass percent

    asked on March 13, 2015
  13. Math

    If 100 students are surveyed, about how many students own 2 or more pets? Explain please 0 pets __________ 1/20 1 pet __________ 1/2 2 0r more _______ 9/20 Thank you very much

    asked on March 23, 2016
  14. Business Math

    Joyce took out a loan for $21,900 at 12 percent on March 18, 2000, which will be due on January 9, 2001. using ordinary interest, Joyce will pay back on January 9 a total amount of: Answer: $24,068.10 Ordinary interest is 360 March 18 = 77 days January 9 -

    asked on January 29, 2012
  15. MATH

    The Megabuck Hospital Corp. is to build a state-subsidized nursing home catering to homeless patients as well as high-income patients. State regulations require that every subsidized nursing home must house a minimum of 770 homeless patients and no more

    asked on January 28, 2011


    asked on October 16, 2009
  17. Chemistry

    The compound copper(II) nitrate is a strong electrolyte. Write the reaction when solid copper(II) nitrate is put into water:

    asked on October 21, 2016
  18. Math

    A wooden duck with a regular selling price of $125.99 is marked down to $79.99. The percent of markdown is: Answer: 36.51% What is the formula? How to solve this?

    asked on January 19, 2012
  19. Math MS. SUE PLEASE HELP!!

    Rolinda’s first five Spanish test scores are 85, 85, 60, 62, and 59. a. Find the mean, the median, and the mode of Rolinda’s Spanish test scores. Round your answers to the nearest tenth, if necessary. b. Which of these measures best supports

    asked on May 9, 2017
  20. Physics

    I was wondering if my answers are correct. Thanks in advance. 1. A boy pushes down on a car rolling horizontally down the road. The boy pushes down vertically with 10N of force as the car rolls 3.0m horizontally. What work is done? my answer: 30 N•m (or

    asked on February 3, 2014
  21. Statistics

    The Boeing 757-200 ER airliner carries 200 passengers and has doors with a height of 72 inches. Heights of men are normally distributed with a mean of 69 inches and a standard deviation of 2.8 inches. b) assume that half of the 200 passengers are men, what

    asked on April 8, 2013
  22. Physics

    I was wondering if my answers are correct. 1. A 50kg person is taking a ride on an elevator travelling up at a steady speed of 2.5m/s. Find the time fo the elevator trip if the elevator does 4900 J of work on the person. My answer: First I used the formula

    asked on February 3, 2014
  23. Math

    A local Dunkin donuts makes blueberry muffins that cost $.69 each to make. Past experience shows that 15% of the muffins will spoil and have to be discarded. Assuming this donut shop wants a 30% markup based on cost and produces 200 muffins, each muffin

    asked on January 19, 2012
  24. English (Check)

    Hi Teachers, will you please check my answers? 1. The speaker’s use of many exclamation points and imperative statements in “Beat! Beat! Drums!” helps readers feel the tone’s humor. urgency.

    asked on May 28, 2012
  25. algebra

    The coordinate plane below represents a town. Points A through F are farms in the town. graph of coordinate plane. Point A is at 2, negative 3. Point B is at negative 3, negative 4. Point C is at negative 4, 2. Point D is at 2, 4. Point E is at 3, 1. Point

    asked on January 28, 2018
  26. Algebra please help out

    Ed is using the recipe shown to make fruit salad. He wants to use 30 diced strawberries in his fruit salad. How many bananas, apples, and pears should Ed use in his fruit salad? The fruit salad recipe reads 4 bananas, diced, 3 apples diced, 6 pears diced

    asked on October 29, 2014
  27. Language Arts

    Identify the antecedent for the underlined pronoun in the sentence below. The boy was excited about his date with Sheila, but he didn't know how (it) would turn out. It is underlined A. boy B. date C. Sheila Is the answer B? Thank you

    asked on August 18, 2015
  28. Math

    Bill furrier marks up mink coats 3000.00, which represents a 50% markup on cost. what is the cost of the coats?

    asked on January 19, 2012
  29. physical science

    what is transition metal number 24 a common solid halogen family 13 bears this name

    asked on November 6, 2007
  30. chemistry

    a student determines the molar mass of methanol by the method used in this experiment. she found that the equilibrium temperature of a mixture of ice and pure water was .4 degrees Celsius on her thermometer. when she added 10g of her sample to the mixture,

    asked on May 22, 2012
  31. Chemistry

    I am to use this formula to find ΔH°f,methane: ΔH°comb=2ΔH°f,water+ΔH°f, carbon dioxide-ΔH°f,methane-2ΔH°f,oxygen For ΔH°comb, the value is 884 KJ/mol For ΔH°f,water, the value is -285.8 For ΔH°f,carbon dioxide, the value is -393.5 I was

    asked on July 20, 2014
  32. Chemistry

    If a total of 13.5 mol of NaHCO3 and 4.5 mol of C6H8O7 react, how many moles of CO2 and Na3C6H5O7 will be produced? 3NaHCO3(aq) + C6H8O7(aq) > 3CO2(g) + 3H2O(s) + Na3C6H5O7(aq)

    asked on May 6, 2012
  33. physics

    in a 100m race, 2 sprinters finish at the same time of 10.2 seconds, accelerating uniformly, sprinter A took 2 seconds to obtain max speed, sprinter B took 3 seconds, they ran their max speed for the remainder of the race, what is the acceleration of each

    asked on January 17, 2012
  34. algebra 1

    the deepest point in elevation in the indian ocean is the java trench, which is 25,344 feet below sea level. elevations below sea level are represented by negative numbers. can you help write the elevation of the Java Trench? also, a mile is 5,280 feet.

    asked on September 10, 2014
  35. English (Check Please)

    Hi Teachers, will you please check my answers? The arrows indicate my answers. Am I right? 1. The speaker’s use of many exclamation points and imperative statements in “Beat! Beat! Drums!” helps readers feel the tone’s humor. urgency.

    asked on May 28, 2012
  36. statistics

    There are two different formulas or methods that can be used to calculate SS. a. Under what circumstances is the definitional formula easy to use? b. Under what circumstances is the computational formula preferred?

    asked on June 22, 2011
  37. Chemistry

    Suppose you wanted to dissolve an aluminum block with a mass of 15.4 g What mass of H2 gas (in g) would be produced by the complete reaction of the aluminum block?.

    asked on October 6, 2009
  38. Physics -- check answers please

    Use g=10 N/kg in this assignment. 1. What is the gravitational energy (relative to the unstretched surface of the trampoline) of the 20 kg ball at its apex 2 m above the trampoline? I got 400 J 2. What is the kinetic energy of the ball just before

    asked on July 3, 2014
  39. math

    The number 199,557 contains two sets of digits in which one digit is ten times as great as the other. What are the values of the digits in each set?

    asked on October 15, 2014
  40. English

    How do the styles and themes of “Theme for English B” and “Ballad of Birmingham” compare? Answer this question in at least a paragraph and make sure to cite examples from the text. Answer:

    asked on May 13, 2012
  41. chemistry

    Sodium metal adopts a body-centered cubic structure with a density of 0.97g/cm3. A. Use this information and Avogadro's number to estimate the atomic radius of sodium. B. If it didn't react so vigorously, sodium could float on water. Use the answer from

    asked on April 3, 2014
  42. physical science

    What is the kinetic energy of a 29 kg dog that is running at a speed of 8.8 m/s (about 20 mi/h)?

    asked on September 9, 2012
  43. Algebra please help out

    Tomas makes balloons sculptures at a circus. In 180 minutes, he uses 252 balloons to make 36 identical balloon sculptures. Part A question how many minutes does it take to mAke one balloon sculpture? How many balloons are used in one sculpture? b. What is

    asked on October 29, 2014
  44. Math

    Solve the equation on the interval [0, 2π). tan2x sin x = tan2x would it be 0, pi/2 ?

    asked on May 23, 2016
  45. lang. arts

    What is a catchy title for an essay about greed?

    asked on November 8, 2016
  46. College chemistry

    The pH of blood is 7.4 and that of saliva is 6.4. what is the difference in pH between these two solutions? How much more Hydronium ion (H3O+) is in the saliva than in the blood. I need a detailed answer with the formulas if you can. I have a hard time

    asked on April 30, 2013
  47. Physics waves- check answers please

    I am not too sure if my answers are correct. Here are the questions: 1. A student standing near a brick wall claps her hands and hears the echo 0.250 s later. If the speed of sound was 340.0 m/s, how far from the wall was she? For this question I got 85 m.

    asked on April 21, 2014
  48. Math

    Lindsay has 10 inches of ribbon. She buys another three lengths of ribbon, each 5 inches long. How much ribbon does she have now?

    asked on November 3, 2015
  49. Physics- check answer please

    1. A 15 kg boy falls out of his bed at a height of 0.50 m. What is the amount of gravitational potential energy lost by the boy? my answer: 74 J 2. What is the speed of a 0.25 kg ball if its kinetic energy is 15 J? my answer: 11 m/s 3. if the speed of an

    asked on July 4, 2014
  50. Consumer Math

    Can you please check my answers:) 1. John Gray bought a basic car for $8,250.00, with options that cost $324.00. There's a 6% sales tax in his state and a combined $50.00 license and registration fee. What was John's total cost? A. $9,138.44 B. $10,000.00

    asked on January 28, 2013
  51. Physics

    A rescue plane is flying horizontally at a height of 132 m above the ground. The pilot spots a survivor and releases an emergency kit with a parachute. The kit descends at a constant vertical acceleration of and the initial plane horizontal speed is .

    asked on October 22, 2014
  52. bus math

    Meg's pension plan is an annuity with a guaranteed return of 7% interest per year (compounded monthly). She would like to retire with a pension of $20000 per month for 20 years. If she works 28 years before retiring, how much money must she and her

    asked on October 27, 2010
  53. College Algebra

    How many liters of 80% hydrochloric acid must be mixed with 40% hydrochloric acid to get 15 liters of 65% hydrochloric acid? Write your answer rounded to three decimals. Show all work.

    asked on October 9, 2011
  54. Math

    You place a mirror on the ground 6 feet from the lamppost. you move back 3 feet and see the top of the lamppost in the mirror. What is the height of the lamppost?

    asked on November 7, 2013
  55. chemistry

    If 5.30mL of 0.1000 M NaOH solution is needed to just neutralize excess acid after 20.00 mL of 0.1000 M HCl was added to 1.00 g of an antacid, how many moles of acid can the antacid counteract per gram?

    asked on March 3, 2013
  56. statistics

    In an extensive study involving thousands of British children, Arden and Plomin (2006) found significantly higher variance in the intelligence scores for males than for females. Following are hypothetical data, similar to the results obtained in the study.

    asked on June 22, 2011
  57. earth

    The radius of the Earth is approximately 6370 km. If one could dig down straight towards the center of the Earth, one would find that the outermost 2890 km (the crust and the mantle) has an average density of about 4.5 g/cm3. Farther down is the core. If

    asked on August 26, 2012
  58. math

    Complete the following probability distribution table and then calculate the stated probabilities. Outcome a b c d e Probability 0.1 1Your answer is correct. 0.43 0.1 0.27 (a) P({a, c, e}). 2Your answer is correct. (b) P(E ∪ F), where E = {a, c, e} and F

    asked on December 4, 2010
  59. More Chemistry

    I have the answers, I just want to be sure...I'm a little hesitant.. 1. Explain how strong acid solutions conduct an electric current: -Strong acids readily release ions creating electro negativity. 2. Will a strong acid or weak acid conduct electricity

    asked on February 15, 2007
  60. Energy question

    Your friend comes across a good deal to purchase a gold ring. She asks you for advice for you to test the ring. The ring has a mass of 4.54 g. When you heat the ring with 94.8 J of energy, its temperature rises from 23.0 degrees celsius to 47.5 degrees

    asked on April 12, 2014
  61. Algebra

    An office building containing 96,000 square feet of space is to be made into apartments. There will be at most 15 one-bedroom units, each with 800 square feet of space. The remaining units, each with 1200 square feet of space, will have two bedrooms. Rent

    asked on June 27, 2008
  62. geography

    Which options describe Chinese developments in mathematics? (Select all that apply.) Prior to inventing numbers, the Chinese method of number writing used clusters of short vertical or horizontal lines for digits. The Han Dynasty invented calculus, even

    asked on October 25, 2018
  63. physics- answers check

    5. A magnetic field map shows a. the direction of the magnetic field. b. a few representational field lines. c. relative strength of the magnetic field. d. All of these choices are correct. my answer: d 6. Magnetic field lines a. can cross each other when

    asked on May 10, 2014
  64. History

    Which factor contributed most to Florida becoming a U.S. territory? a. the outcome of the Seminole Wars b. the weakening of Spain's hold over its colonial possessions c. the desire of Southern politicians to expand slavery into new territories d. the

    asked on May 28, 2016
  65. Math

    What is the 11th term of the following geometric sequence? Enter a whole number 7/9,-7/3,7,-21,63

    asked on August 1, 2015
  66. Calculus 2

    A tank is full of water. Find the work W required to pump the water out of the spout. (Use 9.8 for g and 3.14 for π. If you enter your answer in scientific notation, round the decimal value to two decimal places. Use equivalent rounding if you do not

    asked on June 22, 2013
  67. chemistry

    How much heat energy, in kilojoules, is required to convert 37.0g of ice at −18.0 ∘C to water at 25.0 ∘C ?

    asked on May 9, 2015
  68. physics

    An air hockey table works by pumping air through thousands of tiny holes in a table to support light pucks. this allows the pucks to move around on cushions of air with very little resistance. one of these pucks has a mass of 0.25 kg and is pushed along by

    asked on October 28, 2009
  69. Calculus

    A container is in the shape of an inverted right circular cone has a radius of 2 in at the top and a height of 6 in. At the instant when the water in the conatiner is 5 in deep, the surface level is falling at the rate of -.4 in/s. Find the rate at which

    asked on May 17, 2012
  70. Chemistry-Help

    An AM radio station broadcasts at 1060 kHz. Calculate the wavelength of the corresponding radio waves. How do I calculate this?

    asked on April 30, 2012
  71. Physics waves

    thanks in advanced! A guitar emits a 440 Hz tone. How far apart are the crests in room temperature air (20 degrees celsius)? How long does it take the string to vibrate from crest position to trough position (across twice the amplitude)?

    asked on April 22, 2014
  72. Math

    Mr Shea saved $2500 in April. His monthly salary is two times the amount he saved in April. In May, he saved a certain amount of money. He spent $4200 more than the amount he saved. How much did he save in May? Please explain in easy to understand

    asked on February 27, 2013
  73. math

    A bag contains 3 red marbles, 2 green ones, 1 lavender one, 2 yellows, and 4 orange marbles. How many sets of four marbles include all the red ones? 1Your answer is incorrect.

    asked on November 7, 2010
  74. Physics

    A ball is fastened to one end of a 30cm string, and the other end is held fixed to a support. the ball whirls in a horizontal circle. Find the speed of the ball in its circular path if the string makes an angle of 30 degrees to the vertical.

    asked on February 27, 2014
  75. physical science

    How much work does gravity do on a 0.140-kg ball falling from a height of 14.0 m? (neglect air resistance)

    asked on September 9, 2012
  76. physics- answers check

    1. For a bar magnet, the magnetic field lines point a. towards the South pole. b. towards the North pole. c. always towards the magnet. d. always away from the magnet. my answer: a 2. Magnetic field lines a. are straight lines. b. are always circles. c.

    asked on May 10, 2014
  77. statistics

    A music industry researcher wants to estimate, with a 90% confidence level, the proportion of young urban people (ages 21 to 35 years) who go to at least 3 concerts a year. Previous studies show that 21% of those people (21 to 35 year olds) interviewed go

    asked on November 13, 2016
  78. Social studies.

    The earliest type of trade was A. Bartering B. Currency C. Economies D. Cowry shell currency Is the answer A? Thank you

    asked on August 18, 2015
  79. Pre-Calc

    For the data set shown by the table, a. Create a scatter plot for the data. (You do not need to submit the scatter plot) b. Use the scatter plot to determine whether an exponential function or a logarithmic function is the best choice for modeling the

    asked on May 24, 2016
  80. Physics waves- help please

    1. A person is listening to a new instrument capable of sounds ranging from 10 dB to 150 dB and with frequencies from 12 Hz to 30,000 Hz. Comment on the suitability of this instrument for the musician or audience. 2. A guitar emits a 440 Hz tone. How far

    asked on April 21, 2014
  81. physics

    How would I answer number 3? 1. A sumo wrestler originally jumps 10 cm above a trampoline but has the same total energy of a small ball that was 200 cm higher than the trampoline. What causes this equivalency? 2. If a 40 kg gymnast and a 400 kg sumo

    asked on July 3, 2014
  82. Chemistry

    Fe + 2HCl = FeCl2 + H2 A piece of metallic iron (10 moles) was dissolved in concentrated hydrochloric acid. The reaction formed hydrogen gas and iron chloride. How many grams of HCl were consumed? Don't forget the units.

    asked on June 27, 2010
  83. physics

    A large truck with a mass of 3200 kg is pulling a trailer with a mass of 2400 kg. Both are accelerating at a rate of 0.45 m/s^2 . Determine the tension force between the truck and the trailer, and determine the force with which the truck is pulling. I'm

    asked on June 2, 2017
  84. calculus

    Find the rate of change of area in respect to temperature of a rectangle. Its a steel plate that expands when heated. I have to find that rate of change when width is 1.7cm and length is 2.9. dl/dt=1.0 x 10^-5 (this is an exponent...) and dw/dt=8.0 x 10^-6

    asked on March 6, 2011
  85. Jewelry

    Found a gold ring engraved with cop 91© 8 on it, what does this mean? And is there any worth to it

    asked on August 29, 2018
  86. chemistry

    Three gases (8.00 g of methane, CH4, 18.0 g of ethane, C2H6, and an unknown amount of propane, C3H8) were added to the same 10.0-L container. At 23.0 ∘C, the total pressure in the container is 4.50atm . Calculate the partial pressure of each gas in the

    asked on May 1, 2015
  87. calculus

    Beth leaves a dock in a motorboat travelling at 14 m/s. She heads downstream at an angle of 40° to the current, which flows at 6 m/s. Determine how long it takes for Beth to travel 400 m

    asked on August 16, 2014
  88. Physics

    The radius of the Earth is about 6.37 × 106 m. a) What is the centripetal acceleration of a point on the equator due to the rotation of earth about its axis? Answer in units of m/s 2

    asked on February 8, 2018
  89. Chemistry

    Assuming that the lab procedure was conducted in an identical manner in all other respects, if a large quantity of vinegar had been taken initially for analysis, for example, a 50.0 ml instead of 25.0mL discuss briefly how each of the following would

    asked on March 13, 2015
  90. Precalculus

    A wheel rolling at a constant speed has a radius of 15 inches and takes 30 seconds to roll 100 feet along the ground. What is its angular velocity? Use 3.14 for pie, and solve to two decimal places.

    asked on February 22, 2012
  91. English

    Which of the following stylistic movement best represents Weird Al Yankovic's song Canadian Idiot? Would it be existentialism, modernism or postmodernism and why?

    asked on November 3, 2014
  92. Math

    The triangle in the trapezoid share a 15 inch base and a height of 10 inches. The area of the trapezoid is less than twice the area of the triangle. Find the values of X. X is greater than --- and x is less than 15 inches.

    asked on November 11, 2016
  93. physics

    a 2.0kg object is pulled horizontally by a force of 6.3N along the floor where the coefficient of kinetic friction is o.24. what is the object acceleration

    asked on January 26, 2012
  94. algebra

    A total of $15,000 is invested into two accounts. One of the accounts earns 12% per year and the other earns 10% per year. If the total interest earned in the first year is $1600, how much is invested in each account? 1.) Define the variable(s) and what

    asked on January 18, 2013
  95. chemistry

    The data in the table show the amount of a 500 g sample of sodium-24 over time. Make a graph of the data (remember to label all axes and title the graph). What is the half-life of sodium-24? Explain how you determined your answer. Sodium-24 decays by beta

    asked on May 29, 2012
  96. Science

    In general, the narrower the spectral line of a star A.the hotter the star is B.the bigger the star is C.the denser the star is D.the smaller that star is E.the cooler the star is E. the cooler the star is . Lower temperatures result less Doppler

    asked on October 19, 2006
  97. match

    A certain land area is 340,000 square miles, and it holds a population of 63.1 million people.Calculate the population density.

    asked on February 16, 2012
  98. Chemistry

    Calculate the boiling point of water if the atmospheric pressure is 767 mmHg. Thanks!

    asked on May 25, 2019
  99. english

    Netta and Jim argued over their views of free trade. 2. Netta and Jim had different views on free trade. 3. Netta and Jim were sharply split over the issue of free trade. 4. Netta and Jim refused to discuss the issue of free trade. 16. In these four

    asked on September 21, 2016
  100. Physics waves- check answers please

    1. In a standing wave, the medium at the tip of a loop is a) showing destructive interference b) not moving c) at the original amplitude of the wave d) showing constructive interference my answer: b 2. If a motorcycle is travelling toward an observer the

    asked on April 21, 2014


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