Popular questions and responses by rose
  1. chemistry

    a sample of glucose, c6h12o6 contains 2.03*10^21 atoms of carbon. (a)how many atoms of hydrogen does it contain? (b)how many molecules of glucose does it contain? (c)how many moles of glucose does it contain? (d)what is the mass of this sample in grams?

    asked on February 22, 2013
  2. Physics

    Two springs are attached side by side to a green box of mass M. Determine an expression that describes the period of motion of the box attached to this combination of springs. The two individual springs have spring constants K1 and K2 respectively.

    asked on January 21, 2013
  3. Physics

    A block and tackle with a velocity ratio of 5 is used to raise a mass of 25kg through a vertical distances of 40cm at a steady rate.if the effort is equal to 60N,determine.(a)The distance moved by the effort.(b)The workdone by the effort in lifting the

    asked on January 1, 2015
  4. Chemistry please help

    A general reaction written as 1A + 2B --> C + 2D is studied and yields the following data: Expt (A). (B) initial (C)/t 1. 0.150. 0.150. 8.00 x10^-3 2. 0.150. 0.300. 1.60 x10^-2 3. 0.300. 0.150. 8.00 x10^-3 What is the order of the reaction with respect to

    asked on April 25, 2016
  5. Chemistry

    The average rate of disappearance of ozone in the reaction 2O3(g) ---> 3O2 (g) is found to be 8.12 x 10^-3 molecules over 15 seconds. What is the rate of appearance of O2 during this interval

    asked on April 24, 2016
  6. Chemistry

    Which element is oxidized in this reaction? Fe2O3+ 3CO-(arrow)2Fe+3CO2

    asked on October 5, 2009
  7. Math

    Find the middle term in the expansion of (2x+3y)^12

    asked on March 19, 2016
  8. Physics

    A bullet of mass 6.45 g is fired from a 66.0 cm-long rifle barrel at 237 m/s. The mass of the rifle is 4.50 kg. Determine the acceleration of the bullet as well as the recoil acceleration of the rifle.

    asked on July 9, 2017
  9. Mathematics

    What is the slop of the line passing through points (3,2),(0,-1)?

    asked on August 12, 2020
  10. Geometry

    Pressing a circular cookie cutter over a tray of 1 inch x 1 inch x 1 inch fudge cubes creates a cylinder. If the cylinder consists of approximately 12.6 fudge cubes, what is the approximate area of the cylinder's base? PLEASE HELP!!

    asked on June 11, 2020
  11. Mathematics

    What is the quotient when the product of 20 and 5 is divided by the sum of 20 and 5?

    asked on August 22, 2017
  12. chemistry

    A 2.50g sample of a hydrate of calcium nitrate was heated, and only 1.70g of the anhydrous salt remained. what is the formula of the hydrate?

    asked on February 21, 2013
  13. Math

    1. Which of the following ordered pairs is a solution of the equation y=-4x^2? (1 point) (-2, 16) ***My answer*** (1, -8) (0, -4) (2, -16)

    asked on March 5, 2019
  14. Physics 11

    A 140 kg stationary crate is pulled by a force of 390 N along a horizontal surface. a) The coefficient of static friction between crate and surface is s = 0.25. Is the applied force large enough to begin moving the crate? Use physics calculations to

    asked on July 9, 2017
  15. Biochemistry

    How do you prepare 100 mL of a 0.1 M TRIS-HCl buffer with a pH 7.4 using solid TRIS base (MW 121.1) and 1 M hydrochloric acid? I started with pH=pKa + log ([Tris]/[Tris+] [Tris]/[Tris+]= 10^(7.4-8.06]=0.219 so 0.219:1 ratio with 2.219 total

    asked on January 5, 2011
  16. science

    Which of the following choices correctly describes the behavior of the sound wave as it moves from metal to air? The sound wave slows down and refracts. The wavelength and frequency decrease. The sound wave slows down and refracts. The frequency decreases,

    asked on June 30, 2020
  17. Math

    1.If two angles have equal measures, Then the angles are congruent. True*** False Write the converse of the conditional and problem 1. Can someone help walk me through this please?

    asked on August 29, 2018
  18. Chemistry

    In the reaction Al2S3(s) + 6HCl(aq) --> 2AlCl3(aq) + 3H2S(g), how many moles of HCl are used for each mole of AlCl3 formed? A.0 B.2 C.3 D.1 E.1.5 where do you start and how do you figure it out?

    asked on December 13, 2017
  19. Science

    Given the following balanced equation, determine the rate of reaction with respect to [O2]. 2 SO2(g) + O2(g) → 2 SO3(g)

    asked on February 5, 2015
  20. chemistry

    If 53.62 ml of an oil weighs 48.34 g, what is the specific gravity of the oil?

    asked on February 19, 2013
  21. Critical thinking

    Explain the relationship between informative, explanatory, and persuasive statements and critical thinking.

    asked on October 5, 2011
  22. physics

    A 425 g model rocket is accelerated upward at 86 m/s2 by its engine. What is the value of the force exerted by the engine on the rocket?

    asked on January 26, 2015
  23. Science

    a certain plant's roots contain higher concentrations of nitrates than the soil that surrounds them, which mechanism explains the movement of the nitrate from the soil into the plant's roots? is it facilitated diffusion

    asked on July 28, 2010
  24. Physics

    A student pushes horizontally on a textbook of mass 0.250 kg and holds it stationary against the classroom wall. a) Draw a free body diagram showing and labeling all the forces acting on the textbook. b) From your diagram, what is the friction force that

    asked on July 9, 2017
  25. math

    What are two digit number greater than 40 that is divisible by 2 and 3.

    asked on May 1, 2017
  26. chemistry

    A sample of liquid consisting of only C,H and O and having a mass of 0.5438g was burned in pure oxygen and 1.039g of CO2 and 0.6369g H2O were obtained. what is the empirical formula of the compound?

    asked on February 21, 2013
  27. math

    Unit rate 6 eggs in 7 days?

    asked on January 28, 2013
  28. Math

    You are setting up a system of programming codes for a universal TV remote. Each code will have five digits and cannot include a 0 or repeat any digits. How many codes: A) do not contain a 1? My answer: 8x7x6x5x4 = 6720 codes B)have 2 as the 2nd digit and

    asked on March 21, 2016
  29. Statistics

    Tennis Ball Manufacturing: A company manufactures tennis balls. When its tennis balls are dropped onto a concrete surface from a height of 100 inches, the company wants the mean height of a ball’s bounce upward to be 55.5 inches. This average is

    asked on May 26, 2015
  30. Chemistry

    15.0g of potassium trioxochlorate (v) was crushed and heated with 0.1g of manganese (iv)oxide in it. Write an equation for the reaction and state the role of manganese (iv) oxide in it.

    asked on June 19, 2019
  31. physics

    Two packing crate of masses 10.0kg and 5.00kg are connected by a light string that passes over a frictionless pulley .the 5.00kg crate lies on a smooth incline of angle 40.0 degree find acceleration of the 5.00kg crate and the tension in the string

    asked on May 15, 2012
  32. Chemistry

    A student worked with a sample of ZnSO4.7H2O, what is the stoichiometric ratio of salt to water?

    asked on July 22, 2010
  33. Algebra

    Mrs. Lewis plans to drive 900 miles to her vacation destination, driving an average 50 miles per hour. How many miles per hour faster must she average, while driving, to reduce her total driving time by 3 hours? I'm not sure how to set up the equation.

    asked on November 3, 2007
  34. History

    What attempts have European imperial powers made in the 20th century to address the atrocities committed in colonies throughout the world? (Select all that apply.) A) Many European nations have addressed their imperial actions by providing economic relief

    asked on April 18, 2018
  35. Educational Technology

    1. Why is it important to have good study skills? (A)You will sleep better (B)You will learn more efficiently---- (C)You will have less free time (D)You will impress your parents 2. Why is it important to know how much time you spend on tasks? (A)so you

    asked on January 18, 2018
  36. Physics

    Air resistance acting on a falling body can be taken into account by the approximate relation for the acceleration: a= dv/dt = g - kv, where k is a constant. (a) Derive a formula for the velocity of the body as a function of time assuming it starts from

    asked on September 26, 2013
  37. Sign Language

    Which of the following are the three primary membership considerations of the Deaf community? A. audiological, attitudinal, disability B. audiological, attitudinal, linguistic C. attitudinal, audiometric, disability D. audiological, attitudinal,

    asked on September 7, 2018
  38. Math

    The price of a technology stock has risen to $9.68 today. Yesterday's price was $9.57. Find the percentage increase. Round your answer to the nearest tenth of a percent

    asked on June 1, 2017
  39. trigonometry

    a clock has a dial face of 12 inches radius the minute hand is 9 inches while the hour hand is 6 inches the plane of rotation of the hour hand is 2 inches above the plane of rotation of the minute hand. Find the distance between the tips of the minute and

    asked on March 18, 2014

    Suppose you see a car with an advertised price of $28,550 at $614.45 per month for 5 years. What is the amount of interest paid?

    asked on May 27, 2012
  41. MATH


    asked on July 14, 2011
  42. Maths - trig

    Solve 3cos2x - 7cosx = 0, when 0

    asked on October 3, 2010
  43. Science

    ) Mare is preparing an experiment using 3 cups, one made of paper, one of plastic and one of glass. She plans on pouring 50 ml of hot water from a pitcher into each of the 3 cups and record the temperature in 5 minute intervals. What is the independent

    asked on August 4, 2010
  44. chem

    why cant the molecule C2H6N exists?

    asked on November 17, 2009
  45. World History

    in which way could Christian man in the Ottoman Empire advance through social and political rights? they served as janizaries, right? Please help me.

    asked on September 27, 2018
  46. math

    How would i solve for n nP5 = 14(nP4)

    asked on February 7, 2016
  47. Science

    An object has a volume of 22 liters and a mass of 35 kilograms what's the objects density?¿???????????????

    asked on September 23, 2014
  48. math

    a plane leaves Vancouver headed for Toronto of a speed of 700 km/hr. Half an hour later a planes leaves toronto headed to vancouver travelling at a spped of 750 km/hr. the distance between vancouver and toronto is 3420 kn. How long after the plane leaves

    asked on April 30, 2014
  49. chemistry

    Write the balanced equation for the hydration of CuSO4. Indicate the physical states using the abbreviations (s), (l), or (g) for solid, liquid, or gas, respectively. Use (aq) to indicate the aqueous phase. Indicate appropriate charges on negative and

    asked on November 1, 2013
  50. Chemistry-Please help

    A student placed 11.0 of glucose (C6H12O6) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.-ml mark on the neck of the flask was reached. The flask was then shaken until the

    asked on October 5, 2009
  51. Math-please check

    1. Write a rule for the sequence. 8, -1, -10, -19... A. Start with 8 and add -9 repeatedly B. star with -9 and add 8 repeatedly C. start with 8 and add 9 repeatedly D. start with 8 and subtract -9 repeatedly--- 2. Find the next three terms of the sequence.

    asked on March 9, 2018
  52. Math

    Question: Can the numbers 24, 32, 40 be the lengths of the three sides of a right triangle? Please explain why or why not? My answer: Yes, the numbers 24, 32, 40 can be the lengths of a three-sided right triangle because of the Pythagorean theorem (a^2 +

    asked on February 26, 2018
  53. Physics

    You buy a plastic dart gun, and being a clever physics student you decide to do a quick calculation to find its maximum horizontal range. You shoot the gun straight up, and it takes 36.761s for the dart to land back at the barrel. What is the maximum

    asked on October 31, 2016
  54. Calculus

    Find the area bounded by the y-axis and x = 4-y^2/3

    asked on August 4, 2015
  55. Music

    What is the theme of the song, On s'attache? There are english lyrics but i don't know what the theme would be..

    asked on July 8, 2015

    A hardware supplier manufactures three kinds of clamps, type A, B, and C. Production restrictions force it to make 20 more type C clamps than the total of the other types and twice as many as B clamps as type A clamps. The shop must produce 380 clamps per

    asked on March 24, 2012
  57. science

    Maria is preparing an experiment using three cups, one made of paper, one of plastic, and one of glass. She plans on pouring 50 ml of hot water into each of the three cups and recording the temperatures in 5 minute intervals. What is the independent

    asked on August 4, 2010
  58. Chemistry

    Below are the formulas of some hydrates. what is the mole ratio of salt to water? Hydrate Na2SO4.10H2O Co(NO3)2.6H2O Mo(NO3)2.5H2O CaSO4.2H2O (CaSO4)2.H2) Thankk you

    asked on July 22, 2010
  59. math

    5 pens and 3 rulers cost a total of £1.22 3 pens and 6 rulers cost a total of £1.53 How much does each pen and each ruler cost?

    asked on May 25, 2019
  60. physics

    a body weighs 400N in water.if the upthrust force is 20n.calculate its weight in air.

    asked on April 20, 2019
  61. Algebra

    Is the equation true, false or open 4y+8=6y+3

    asked on October 18, 2017
  62. chemistry

    1040 kHz (typical frequency for AM radio broadcasting) Express your answer in meters using four significant figures.

    asked on June 21, 2017
  63. Chemistry

    Complete the following equations. Include names of all reactants and products A) CH3CH2CHCH - CH2+H2O --> | CH3 B) CH3CHC=CCH3 + H2 ---> | CH3

    asked on May 23, 2016
  64. Data Management

    You are thinking of using some leftover ceramic tiles to make a decorative border for a patio. You have ten blue, four gold, and six white tiles. In how many ways can you make the border if it requires 15 tiles and you use only blue and white ones? Explain

    asked on March 16, 2016
  65. Physics

    a spring extends by 10 cm when a mass of 100g is attached to it. what is the spring constant?

    asked on January 27, 2016
  66. French - SraJMcGin

    If my paragraph is correct « Une affaire terriblement seule de la vie. Vous entrez dans seul le monde et vous sortez seul du monde pourtant il semble à moi que vous êtes plus seul tout en vivant que jamais allant et venant » – Emily Carr In le roman,

    asked on July 27, 2015
  67. physics

    calculate the amount of heat energy required to melt a 1kg iron ingot initially at 20 ¡ãC? (heat of fusion for Fe is 33.0 J/g

    asked on August 4, 2014
  68. physics 20

    Two people, a and b, are pulling on a tree with ropes while person c is cutting the tree down. Person a applies a force of 80.0N (45.0degrees) on one rope. Person b applies a force of 90.0N (345degrees) on the other rope. Calculate the net force on the

    asked on March 16, 2013
  69. Geometry Inscribed

    line BC is tangent to circle A at B and to circle D at C (not drawn to scale) AB=11, BC=23,and DC=2. find AD to the nearest tenth. Image: i.imgur(dot)com/f4ThxTu.jpg

    asked on March 9, 2013
  70. chemistry

    a 5.00g sample of a hydrate of barium chloride was heated, and only 4.30g of the anhydrous salt remained. what is the formula of the hydrate?

    asked on February 21, 2013
  71. Algebra

    Starting at the same point, Angie and Payton jog in opposite directions. Angie can jog 1.5 miles per hour faster than Payton. After 2.5 hours, they are 20 miles apart. How fast can each person jog?

    asked on February 8, 2012
  72. math

    20 copies of the school yearbook together weigh 50 lb. What is the weight of each book? How do I set this up?

    asked on November 19, 2010
  73. science

    Maria is preparing an experiment using three cups, one made of paper, one of plastic, and one of glass. She plans on pouring 50 ml of hot water into each of the three cups and recording the temperatures in 5 minute intervals. What is the independent

    asked on August 4, 2010
  74. english 2 - revised please

    Which part of the writing process was easiest for you? Which part was the most difficult? What did you learn from your writing experience during this class? In what ways have you learned to write more critically? How will this knowledge assist you with

    asked on April 2, 2008
  75. medical coding

    In alphabetic index of icd-10-cm non essential modifier are

    asked on October 9, 2019
  76. Probability

    one hundred clients of a registered tax agent fall into the cayegories of personal (25 male ,30 female), corporate (10 male, 15 female) and small business (8 male, 12 female).The agent selects a client at random to begin work, find the probability that the

    asked on October 7, 2019
  77. Math-please check

    5. Find three solutions of the equation y=9x-4. (A) (-5, -49), (-2, -22), (3, 23) (B) (-5, -49), (2, -22), (3, 23)*** (C) (-5, -49), (-2, -22), (-3, 23) (D) (5, -49), (-2, 22), (-3, 23) 9.Which is a rule that describes the translation of a point from (4,

    asked on April 12, 2018
  78. Math-please check

    7. The cost for a business to make greeting cards can be divided into one-time cost (e.g., a printing machine) and repeated costs (e.g., ink and paper). Suppose the total cost to make 300 cards is $900.00, and the total cost to ma 650 cards is $1,600.00.

    asked on March 11, 2018
  79. Math

    8. The graph below was drawn with the output on the vertical axis and input on the horizontal axis. What does this graph indicate about the relationship between the input and the output? (1 point) (Can't display graph) Please help I do not understand how

    asked on March 2, 2018
  80. Math

    9. Which value could be the length of the missing side of the triangle? There's an isosceles triangle and one length on one side is 5 and the other is 12, and an x at the top. What is the length of x? A. 5 B. 7 C.17 D.12 Help i don't understand how to find

    asked on January 24, 2018
  81. Math

    For a calculus quiz, the teacher will choose 11 questions from the 15 in a set of review exercises. How many different sets of questions could the teacher choose

    asked on March 20, 2016
  82. Math

    A game show has three doors labelled A,B, and C behind which there may or may not be a prize. A group of contestants are asked behind which doors they think there is a prize. The results are that 18 people choose A, 19 people choose B, 19 people choose C,

    asked on February 23, 2016
  83. chemistry check if my answers are right. drbobzz

    Acetylene gas(c2h2) is used in welding. During one job a welder burns 48.0 g of acetylene. Using a balanced equation for the complete combustion of acetylene calculate the following. Equation 2C2H2 + 5O2 ---> 4CO2 + 2H2O A) the mass of oxygen used B) the

    asked on December 7, 2014
  84. Microbiology

    What methods would you use to sterilize and clean a lab coat contaminated with a broth culture of Vibrio cholerae so that the lab coat could be safely used again? a. Method of sterilization: b. Method of cleaning: c. Name which method would be implemented

    asked on September 26, 2014
  85. Microbiology

    Name a pathogenic endospore-forming bacterium (provide genus and species names) which can be associated with improperly canned beans. Note what method is used to process canned beans. If the canned beans are not properly processed and these pathogenic

    asked on September 26, 2014
  86. earlychildhood

    when a teacher hears a preschool student using incorrect language she should

    asked on August 2, 2013
  87. math

    given the points A(0,0), B(3,1) and C (1,4) what is the measure of angle ABC I plotted it on a gragh and got 1.46 degress. I am unsure if I am doing this question correctly. Or am I misreading it thanks in advance .

    asked on April 14, 2013
  88. chemistry

    the mass of 2.50 mol of a compound with the formula ECl4, in which E is a nonmetallic element, is 385g. what is the molar mass of Ecl4? what is the identity of E?

    asked on February 22, 2013
  89. MATH

    EVALUATE 5x - 2y + 4z WHEN x=3, y=2, AND z=4 ??

    asked on July 14, 2011
  90. MATH


    asked on July 14, 2011
  91. Math (Precal)

    csc^2x secx/sec^2x+csc^2x simplify.

    asked on May 9, 2011
  92. anatomy

    If a person has stopped breathing and is recieving pulmonary resuscitation would it be better to administer pure oxygen or a mixture of oxygen and carbon dioxide?

    asked on May 7, 2010
  93. Biochemistry

    What physical properties are different for the isomers of C4H10? Explain.

    asked on October 7, 2009
  94. Chemistry-Please help

    A solution contains one or more of the following ions: Hg2 2+,Ba2+ ,Fe2+ and . When potassium chloride is added to the solution, a precipitate forms. The precipitate is filtered off and potassium sulfate is added to the remaining solution, producing no

    asked on October 5, 2009
  95. cultural diversity

    Is (C) ethnicity the best answer for this question? Label shifts,such as African-American versus colored, Asian versus Oriental, and Latino versus Hispanic, relate to: A. ethnology B. ethnocentrism C. ethnicity D. ethnography

    asked on October 24, 2007
  96. Social studies

    Which statement best summarizes the paragraphs main point?

    asked on June 18, 2020
  97. Physics

    An athlete swims the length if 50m pool in 20s and makes the return trip to starting point in 22s.Determine the average speed and velocities a. the first half of the trip b.second half of the trip c. Round trip

    asked on June 16, 2020
  98. History

    Why is the Korean War significant in World History?

    asked on May 27, 2020
  99. Math

    1) A 3, 300.00 principal earns 4% interest compounded annually. After three years, what is the balance in the amount? 2) A 6,000.00 Annable earns 8% annual interest compounded semiannually (twice per year) after 35 years, what is the balance in the

    asked on September 11, 2019
  100. chemistry

    When using a manometer to check Boyle's law, why is the pressure changed slowly? a. to avoid compressing the liquid b. to avoid compressing the gas c. to avoid changing the gas temperature d. to avoid changing the mass of the gas Is it B?

    asked on February 26, 2019


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