Most popular questions and responses by Kay
  1. Chemistry

    CCl3F boils at 23.8 degrees Celcius, and its molar heat of vaporization is 24.8 kJ/mol. Calculate the molar entropy of vaporization of CCl3F (l)

    asked on January 31, 2012
  2. Chemistry

    The Ksp of tin(II) hydroxide, Sn(OH)2, is 5.45 × 10-27. Calculate the solubility of this compound in g/L.

    asked on March 18, 2014
  3. social studies

    ANSWER! PLEASE!! which of the following most contributed the rise of Sumer? a. farming b. military power c. isolated location d. trade

    asked on April 28, 2014
  4. chemistry

    When aqueous solutions of potassium carbonate and magnesium nitrate are combined, solid magnesium carbonate and a solution of potassium nitrate are formed. The net ionic equation for this reaction is:

    asked on March 3, 2014
  5. language arts

    which of the following statements best summarizes the "fiddler's bill" Bostonians had to pay for the tea party as described in section 1 of chapter 7 in chapter Johnny Tremain? A The port of Boston was closed to all ships, numbers of workers lost their

    asked on December 18, 2014
  6. statistics

    for a standard normal curve, find the z-score that separates the bottom 30% from the top 70%

    asked on November 5, 2008
  7. science

    Which evidence from the sea floor shows that tectonic plates move? A) the sea floor is youngest near a mid ridge and farther away. B) the sea floor is much older the cont. C) mid ocean ridges form the longest range of mountains on earth. D) the sea floor

    asked on May 8, 2014
  8. HELLP!! calculus

    A piece of wire 25 m long is cut into two pieces. One piece is bent into a square and the other is bent into a circle. (a) How much of the wire should go to the square to maximize the total area enclosed by both figures? (b) how much of the wire should go

    asked on November 23, 2011
  9. History

    In what way was the government of ancient Athens different from that of the United States? A. Athens was direct democracy in which citizens voted on laws themselves B. Athens was an oligarchy ruled by the wealthy members of the council of 5 hundred. C.

    asked on October 21, 2016
  10. number theory

    According to the Journal of Irreproducible Results, any obtuse angle is a right angle! Here is their argument. Given the obtuse angle x, we make a quadrilateral ABCD with DAB = x, and ABC = 90◦, andAD = BC. Say the perpendicular bisector toDC meets the

    asked on January 30, 2013
  11. language arts

    Which of the following statements best summarizes the "fiddler's bill" Bostonians had to pay for the tea party, as describes in 1 of chapter 7 from Johnny Tremain? A. The port of Boston was closed to all ships, and huge numbers of workers lost their jobs.

    asked on December 17, 2014
  12. Trig

    A tourist looks from the observation deck of the space needle in Seattle. The deck is at a height of 520ft. She sees her friend on the ground below at an angle of depression of 83.1 degrees. What is the distance between the two? Round to the nearest tenth

    asked on February 28, 2018
  13. Stats

    Health insurers are beginning to offer telemedicine services online that replace the common office visit. Wellpoint provides a video service that allows subscribers to connect with a physician online and receive prescribed treatments (Bloomberg

    asked on April 6, 2019
  14. chemistry

    Sodium carbonate reacts with nitric acid according to the following equation: Na2CO3+2HNO3-->2NaNO3+CO2+H2O a. how many moles of Na2CO3 are required to produce 100.0 g of NaNO3? b. if 7.50g of Na2CO3 reacts, how many moles of CO2 are produced?

    asked on May 28, 2012
  15. chemistry

    Write the net ionic equation for the following molecular equation. HBr is a strong electrolyte. HClO is a weak electrolyte. KClO(aq) + HBr(aq) KBr(aq) + HClO(aq)

    asked on March 3, 2014
  16. Physics

    Sam pushes crates starting form rest across the floor of his classroom for 3 s with a net force as shown above. For each crate, rank the following from greatest to least: A 100N/30kg, B 75N/20kg C 50N/10kg 1. Impulse delivered 2. Change in momentum 3.

    asked on November 12, 2014
  17. Chemistry

    The rate equation for the hydrolysis of sucrose to fructose and glucose is first order. After 27 minutes the sucrose concentration decreased from 0.0146M to 0.0132M. Find the rate constant K. Please help me!

    asked on April 11, 2018
  18. CHEM 2: Boiling Point

    Which Aqueous solution has the highest normal boiling point? a.) 0.1 m NaCl b.) 0.1 m C2H5OH c.) 0.1 m CaCl2 d.) They all have the same boiling point. I think that the answer is D, the all have the same boiling point. Is this correct? Because Delta T=

    asked on June 12, 2016
  19. Chemistry

    net ionic equation for the following molecular equation. HNO3 is strong electrolyte and CH3COOH is weak electrolyte. NaCH3COO(aq)+HNO3(aq)----->NaNO3(aq)+CHOOH(aq

    asked on March 1, 2014
  20. Social studies

    Why were the island shown on this map most likely acquired or annexed by the United States?

    asked on March 11, 2018
  21. geometry

    Two poles, 60 feet tall and 20 feet tall, stand on opposite sides of a field. The poles are 80 feet apart. Support cables are placed from the top of each pole to the bottom of the opposite pole. How far above the ground is the intersection of the cables.

    asked on October 3, 2011
  22. Chemistry

    A 25.00 mL sample of HCl was titrated with 35.79 mL of 0.250 M KOH. The concentration of the HCl solution is:

    asked on April 6, 2015
  23. algebra

    1. simplify the rational expression by rationalizing the denominator? 4 over sqrt 150 __________________ sqrt 189x

    asked on May 1, 2017
  24. geometry

    A rectangle has a length of 9inches and a height of 1.5 feet. What is the area of the rectangle in square inches?

    asked on March 13, 2012
  25. Calculus

    I need help setting up the equation. The portion of the graph y = ex between x = 0 and x = ln 3 is rotated around the y axis to form a container. The container is filled with water. Use n = 4 subintervals and midpoints to approximate the work required to

    asked on July 22, 2011
  26. Geometry

    The degree measure of the vertex angle is (3x-8). The degree measure for each base angle is (6x-41). What is the value of vertex angle?

    asked on October 21, 2015
  27. Chem

    What is the enthalpy for the following reaction? C2H4+H2O--->C2H5OH

    asked on November 4, 2010
  28. geometry

    Kristen lives directly east of the park. The football field is directly south of the park. The library sits on the line formed between Kristens home and the football field at the exact points where an altitude to the right triangle formed by her home, the

    asked on May 24, 2012
  29. physics

    A uniform beam of length 7.60 m and weight 3.90 102 N is carried by two workers, Sam and Joe, Sam=1.00m Joe=2.00m between both Joe and Sam there is 7.60m (a) Determine the forces that each person exerts on the beam. F_Sam = N F_Joe = N (b) Qualitatively,

    asked on November 2, 2008
  30. Algebra

    The formula I = PRT where I = Interest, P = principal, R = rate, and T = time is used to calculate the amount of simple interest earned. Solve this formula for T.

    asked on October 22, 2016
  31. Chemistry

    X rays of wavelength 2.63 were used to analyze a crystal. The angle of first-order diffraction (n = 1 in the Bragg equation) was 16.14°. What is the spacing between crystal planes?(in pm) Do I just plug everything in the Bragg's equation? nλ=d*sinθ n=1

    asked on November 23, 2010
  32. Organic Chemistry

    How does acetaldehyde impurity arise in the fermentation?

    asked on October 14, 2007
  33. Biology

    An organism that is eukaryotic, multicellular, and lacks a cell wall would be classified in which kingdom. Protista Fungi Animalia Archaebacteria Eubacteria I really don't know which ones it is I tried 13 times. Choose all the applies.

    asked on March 18, 2019
  34. Statistics

    32% of adult internet users have purchased products or services online. For a random sampling of 200 adult users, find the mean, variance and standard deviation for the number who have purchased goods or services online?

    asked on March 17, 2013
  35. mosinee

    Jane Hilman went to her bank. She had a balance of $1,009.88 in her savings account. She withdrew $130.00 and the teller credited her account with $6.19. What is her new balance?

    asked on April 23, 2012
  36. SAT Math

    If m percent of 50 is equal to 20 percent of n, then what is the value of m/n? Thank you!

    asked on December 23, 2016
  37. Chem

    What is the empirical formula of a compound that contains 27.0%S, 13.4%O,and 59.6%Cl by mass?

    asked on December 8, 2010
  38. Geometry

    1) In the diagram above, line a is parallel to line b. Which theorem or postulate allows you to conclude that angle 6 is equal to 8? , line a is parallel to line b. Which of the following can you conclude based on the Alternate Interior Angles Theorem?

    asked on January 15, 2012
  39. geometry

    State a conclusion that seems reasonable. You eat a new kind of fruit and suffer from hives for the first time in your life. A week later, you try the fruit and the hives recur. A month later, you have a similar experience.

    asked on January 12, 2012
  40. Physic

    A penny on its side moving at speed v slides off the horizontal surface of a table a vertical distance y from the floor. a) Show that the penny lands a distance v√(2y/g) from the base of the coffee table. b) If the speed is 3.5 m/s and the coffee table

    asked on November 7, 2014
  41. Trig

    Use the half angle formula to find the exact value of tan 7 pie/8

    asked on September 13, 2007
  42. Chemistry

    One-third cup of vanilla ice cream provides about 145 kcal of energy. A typical adult uses about 195 kcal/hr of energy while walking. If all of the energy in one third of a cup vanilla ice cream were to be burned off by walking, how many minutes would it

    asked on November 12, 2016
  43. math

    In how many ways can a teacher arrange 6 students in the front row of a classroom with a total of 20 students

    asked on January 27, 2012
  44. economics

    Can you analyze and label at least 10 advertisements as to whether they are competitive or informative?

    asked on November 6, 2011
  45. chemistry

    Find the volume of 0.120 M hydrochloric acid necessary to react completely with 1.51 g Al(OH)^3

    asked on October 16, 2011
  46. Physics

    a 1000 kg car traveling at 30 m/s suddenly stops in 5 seconds. how much force was used to stop the car?

    asked on April 13, 2011
  47. P.E

    Anger is a normal emotion that all humans feel at some time. It is important to express this emotion in a healthy way. Which of these ways of dealing with anger might affect your health in a negative way? A.) Accept your feelings B.) Ignore your triggers

    asked on April 18, 2017
  48. Physics

    After solving a difficult physics problem, an excited student throws his book straight up. It leaves his hand at 2.5 m/s from 1.5 m above the ground. A) How much time does it take until the book hits the floor? B) What's its velocity then?

    asked on January 21, 2017
  49. 10th chemistry

    what mass of sucrose, C12H22O11, is needed to make 300.0 mL of a .50M solution?

    asked on June 2, 2010
  50. spanish

    select the correct form for the verb escribir. 1. Dudaba que el principe___ cuentos para ninos. My answer escribia b. escribe c. escribiera d. escribio 2. Elena___ a una conferencia anoches. a. asistio my answer b. asistia c. asiste d. ha asistido 3.

    asked on May 8, 2010
  51. Physics

    with what minimum speed must a ball be thrown straight up in order to reach a height of 34 meters above the launch position?

    asked on January 22, 2016
  52. Chemistry 1

    Sodium carbonate reacts with a solution of HCl solution with the evolution of gas (CO2) to yield a solution that is neutral. If 0.265 grams of sodium carbonate are required to neutralize 1.00 mL of HCl solution, what mass (in grams) of sodium carbonate

    asked on February 5, 2010
  53. Physical Science

    Explain why a neutral atom cannot haveone proton, one neutron and two electrons?

    asked on March 11, 2008
  54. Macro Consumption Question

    (Simple Spending Multiplier) For each of the following values for the MPC (marginal propensity to consume), determine the size of the simple spending multiplier and the total change in real GDP demanded following a $10 billion decrease in spending: a. MPC

    asked on April 16, 2013
  55. Chemistry

    The combustion of 132 g of propane, C3H8, with excess oxygen liberates 6.6x10^3 kj of heat. What is the enthalpy change for the reaction below: C3H8(g) + 5O2(g) -> 3CO2(g) + 4H2O(l)

    asked on October 14, 2012
  56. physical science

    what happens to a helium balloon if you take it from a warm house to outside on a snowy day? Could you classify this change as a phase change?

    asked on February 13, 2008
  57. Acct.101

    Post to the account Stock Investments. Common Stock Shares Cost Co.A 1,980 $91,080 Co.B 4,990 $44,910 Co.C 1,100 $24,200 I am trying to figure out what the stock investment amount is and to find the stock investment. Additional information Sept 1, Sold 998

    asked on April 12, 2015
  58. Chemistry

    Use enthalpies of formation from the textbook to calculate the standard enthalpy of the reaction for the following methane- generating reaction of methanogenic bacteria given delta Hf of CH3NH2=-22.97kJ/mol: 4CH2NH2+2H2O----->3CH4+CO2+4NH3

    asked on November 6, 2011
  59. physics

    The height of the Empire State building is 318.00 meters. A pebble is dropped from the top of the building, what is the stones velocity just before it strikes the ground?

    asked on February 12, 2018
  60. Math

    Nick borrowed $7150, to be repaired at an annual simple interest rate of 6.25%. How much interest will be due after 5 years? How much will Nick have to repay?

    asked on February 3, 2017
  61. algebra

    9 balls in a hat. balls are numbered 1-9. you choose 3 balls. how many possible combinations are there?

    asked on September 13, 2015
  62. math

    The sides of a triangular lot are represented by x, 2x, and 3x + 2. Find each side if the perimeter is 362 feet.

    asked on May 18, 2011
  63. chemistry

    Benzoic acid and quinine are dissolved in a solution of dichloromethane. Besides the normal neutral forms for benzoic acid and quinine, will there be any other chemical form(s) present in the dichloromethane solution? (benzoic acid pKa = 4.2; quinine pKa =

    asked on August 22, 2010
  64. Physics

    A 1900kg car starts from rest and drives around a flat 56-m-diameter circular track. The forward force provided by the car's drive wheels is a constant 1000N. a. What is the magnitude of the car's acceleration at t=13s? b. What is the direction of the

    asked on March 9, 2010
  65. math. logs

    anyone know how to solve this step by step? e^(3ln2)

    asked on September 28, 2008
  66. Math

    20% of the books in a library are fiction. and the rest are non fiction. When 30% of the fiction books and 15% of the non fiction books are borrowed there are 1,312 books left in the library. How many books are borrowed?

    asked on December 11, 2018
  67. math

    A customer earned $3,262.50 interest on a 9-month CD. How much was the opening deposit?

    asked on April 4, 2014
  68. physics

    Two blocks of masses m and 2m are held in equilibrium on a frictionless incline as in the figure. In terms of m and θ, find the following.

    asked on September 28, 2013
  69. physics

    A meterstick is at rest in an inertial frame S2.If S2 moves with a speed of 0.8 c with respect to a rest frame S1, find the length of the meterstick as measured in frame S1 according to classical physics. Answer in units of m.

    asked on March 28, 2011
  70. Statistics and Probability

    A batch consists of 2 defective coils and 48 good ones. Find the probability of getting no defective coils when three coils are randomly selected without replacement

    asked on November 28, 2018
  71. Chemistry

    If the pressure of the gas inside the flask were increased and the height of the column in the open-ended arm went up by 0.5mm, what would be the new pressure of the gas in the flask, in torr? ANSWER IS 807.3 TORR

    asked on January 17, 2018
  72. social studies

    The types of crops grown by farms in the Andes is influenced in large part by A. elevation. B. latitude. C. longitude. D. pampas.

    asked on November 9, 2017
  73. math

    A perpendicular bisector is a segment which is perpendicular to another segment, and specifically goes through the midpoint of the segment. Find the equation of the perpendicular bisector of in slope intercept form, given A(3,6) and B(3, 10) .

    asked on November 21, 2010
  74. chemistry

    This is a lab question...I don't understand how to do it. A solution consisting of isobutyl bromide and isobutyl chloride is found to have a refractive index of 1.4194 at 20 degrees celsius. The refractive indices at 20 degrees celsius of isobutyl bromide

    asked on November 11, 2009
  75. SAT Math Question?

    Lindsey and Stephen work at a factory. Lindsey can complete one full job in three hours, and Stephen can complete the same job in five hours. If Lindsey and Stephen work together on the job for one hour, then how long, in minutes, will it take Stephen to

    asked on December 28, 2016
  76. Stats

    Suppose that you are in a class of 31 students and it is assumed that approximately 10% of the population is left-handed. (Give your answers correct to three decimal places.) (a) Compute the probability that exactly five students are left-handed. (b)

    asked on February 16, 2014
  77. Chemistry

    CFCs such as CF2Cl2 are refrigerants whose use has been phased out because their destructive effect on Earth's ozone layer. The standard enthalpy of evaporation of CF2Cl2 is 17.4 kJ/mol, compared with change in H(vapor)=41kJ/mol for liquid water. How many

    asked on November 6, 2011
  78. algabra II

    does anyone have the answers to exam 00703600 inequalities, permutations, and probabilities i just need the part on graphing the inequalities

    asked on September 29, 2010
  79. Medical Coding

    What are the CPT and ICD codes for this case? Gladys Swain slipped from a sidewalk curb and twisted her right ankle. Because of the severe pain she was suffering and the inability to bear weight on the foot, she sought treatment at her neighborhood

    asked on June 3, 2010
  80. SAT Math Question?

    Which of the following accurately defines all possible values of p-q if 15≤p≤30 and 7≤q≤19? The answer is -4≤(p-q)≤23, but I'm not sure how. Thank you!

    asked on December 22, 2016

    A rectangular storage container with a lid is to have a volume of 8 m. The length of its base is twice the width. Material for the base costs $4 per m. Material for the sides and lid costs $8 per m. Find the dimensions of the container which will minimize

    asked on November 23, 2011
  82. Algebre

    the graph of g(x) is f(x) translated to the left 8 units and up 2 units. What is the function rule for g(x) given f(x)=x^2

    asked on October 1, 2018
  83. geometry

    apply the transformation m to the triangle with the given vertices. name the coordinates of the image points. identify and describe the transformation m: (x, y) -> (1.5x, 1.5y) l(-1, 4), m(-4, 4), n(-4, 3)

    asked on October 29, 2017
  84. Math

    6 friends share 5 apples equally. How much apple does each friend have?

    asked on March 23, 2017
  85. algebra

    Yoko runs 3 miles in 25 minutes. At the same rate, how many miles would she run in 20 minutes?

    asked on March 15, 2015
  86. algebra 2

    lisa can shovel snow from her driveway in 40 minutes jim can do the same job in 50 minutes how long would it take lisa and jim to shovel the driveway together?

    asked on March 28, 2012
  87. math

    Can you please check my work. A particle is moving with the given data. Find the position of the particle. a(t) = cos(t) + sin(t) s(0) = 2 v(0) = 6 a(t) = cos(t) + sin(t) v(t) = sin(t) - cos(t) + C s(t) = -cos(t) - sin(t) + Cx + D 6 = v(0) = sin(0) -cos(0)

    asked on June 23, 2011
  88. Pre-Algebra

    While visiting a farm, you notice that there are only chickens and rabbits in the farmyard. You can't help but wonder how many of each animal there is on the yard, but when you ask Farmer Fred he refuses to give you a direct answer. (Some say he must have

    asked on February 20, 2008
  89. PreCal

    On average, the earth in 93 million miles away from the center of the sun. a.) assuming that the earth's orbit is circular, estimate the number of miles our planet travels in one complete revolution around the sun.

    asked on August 18, 2017
  90. algebraI

    Airplane at 19,200 feet descending at a rate of 40 feet per second. Another airplane takes off and ascends at a rate of 60 feet per second. After how many seconds will the airplanes be at the same height? What is this height?

    asked on January 21, 2014
  91. Math

    A mechanic charges $35 an hour plus parts to fix a car. If the parts cost $90 and it took 5 hours to do the job, what is the total cost of the repair?

    asked on March 13, 2012
  92. Trig.

    Given sin ∅ 3/5, find a, the other angle in the right triangle The answer is 30,60,90 How is this someone explain?

    asked on February 26, 2018
  93. Science HELP

    Although the Amazon Basin receives more than 80 inches of rain per year, South America also has the driest place on Earth, known as A. Death Valley. B. Gobi Desert. C. Atacama Desert. D. the Caribbean.

    asked on November 9, 2017
  94. chemistry

    What is the final volume of NaOH solution prepared from 200.0mL of 0.500M NaOH if you wanted the final concentration to be 0.200M ?

    asked on December 4, 2014
  95. math

    Natalie is buying potatoes at the grocery store. If she buys 6 potatoes that each have a mass of 375 grams, what is the total mass of the potatoes, in kilograms?

    asked on March 13, 2013
  96. Chemistry

    If 395 grams of water at 21 Celsius absorbs 285kJ of heat from a mountain climbers stove at an elevation where the boiling point of water is 87 Celsius, is this amount of energy sufficient to heat the water to its boiling point? How many kJ are required to

    asked on November 6, 2011

    a ball of mass m1 and a block of mass m2 are attached by a lightweight cord that passes over a frictionless pulley of negligible mass. the block lies on a frictionless incline of angle theta. (a) draw the free body diagrams (b) express newton's second law

    asked on April 10, 2011
  98. math-rational equations

    how do I solve 5/x-3+3/x+3=7x/x^2-9 please explain in detail, I am having trouble once I get to the part where I need to simplify. I have so far the LCD is x^2-9 then the equation changes to (x^2-9) 5/x-3+(x^2-9) 3/x+3=(x^2-9) 7x/x^2-9 or (x+3)*5(x-3)*3=7x

    asked on July 1, 2009
  99. chemistry

    using each of the following baldfaced chemical equations calculate the number of moles of the first listed reactant need ed to produce 5.00 moles of CO2 . C7H16+11O2-->7CO2 +8H2O

    asked on October 31, 2018
  100. Math

    A Gentoo penguin can swim at a rate of 17 mph. How many miles can a penguin swim in four hours? Use the expression RT, where R represents rate and T represents time.

    asked on March 9, 2016


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