kristin

Newest questions and responses by kristin
  1. West and Worlds since 1500

    Which of the following are ways that intellectual, political, social, and religious developments of the seventeenth century were related, especially in regard to the dynamics of the Scientific Revolution? Check all that apply. The English Revolution

    asked on February 1, 2018
  2. math

    Paul works for three hours. Sally works 2 1/2 times as long as Paul. Raul works 3/4 hours less than Paul. Tim works 1 1/3 times as long and Raoul. How long does each person work? How long do they work together?

    asked on December 12, 2016
  3. math

    In a lottery game, a player picks 9 numbers from 1 to 43. How many different choices does the player have if order doesn't matter?

    asked on November 19, 2016
  4. Chemistry

    What is the standard cell potential of a cell made of theoretical metals Ms/Ma^+2 and Mb/Mb^+2 if the reduction potentials are -0.19V and -0.85 V, respectively? +0.66V -0.66V +1.04 V*** -1.04V

    asked on June 1, 2016
  5. Chemistry

    What symbol is used to show the standard reduction potential of an oxidation reaction in a half cell? The sub means what follows is a subscript So the 0 is a superscript and the sub is its subscript E^0 sub cell*** E^0 sub red E^0 sub oxid All of the above

    asked on June 1, 2016
  6. Chemistry

    To charge a lead storage battery you must apply a direct current to it. hold a magnet close to it. force alternating current through it.*** increase the pressure on it.

    asked on June 1, 2016
  7. Analytical Chemistry

    A 10.0 mL sample of whiskey was diluted to 500.0 mL. A 4.00 mL aliquot of the diluted sample was removed and the ethanol, C2H5OH, was distilled into 50.00 mL of 0.02150 M K2Cr2O7 and oxidized to acetic acid. The excess Cr2O72– was then back titrated with

    asked on October 19, 2015
  8. Physics

    Suppose you have a stack of 9 identical oak planks, each of which have a mass of 8.0 kg. You are required to pull the seventh plank from the stack (counting from the top). If the coefficient of friction between oak and oak is 0.6, how hard do you have to

    asked on October 7, 2015
  9. Physics

    A block of mass 8.60 kg is pulled along a horizontal frictionless surface by a cord that exerts a force of 33 N at an angle 29.40 degrees from the horizontal. What is the magnitude of the normal force exerted on the mass by the floor? I solved for the

    asked on October 7, 2015
  10. Math

    The top of a tree makes angles s and t with Points K and L on the ground, respectively, such that the angles are complementary. Point K is x meters and Point L is y meters from the base of the tree. A)In terms of x and y, find the height of the tree.

    asked on September 10, 2015
  11. Physics

    You attach one end of a spring with a force constant k = 893 N/m to a wall and the other end to a mass m = 2.02 kg and set the mass-spring system into oscillation on a horizontal frictionless surface as shown in the figure. To put the system into

    asked on April 22, 2015
  12. Chemistry

    In a solution of a weak acid and its conjugate base, which condition has to be true for pH to equal pKa? The concentration of acid has to be greater than the concentration of base. The concentration of acid has to be equal to the concentration of base. An

    asked on April 20, 2015
  13. Chemistry

    Calculate the hydronium ion concentration of blood which has a pH of 7.24. 7.17 x 10-4 M 5.75 x 10-8 M 1.15 x 10-7 M 0.86 M none of the above I had chose 1.15*10^-7 by doing the log equation -log(1.15...) and I but it goether with -log(10*^-7.24) and it

    asked on April 20, 2015
  14. Chemistry

    What is the pH of a solution which has hydroxide concentration, [OH-], equal to 7.6 x 10-4 M? 0.88 3.12 10.9 13.1 none of the above I had chose 3.12 for this one and this one was also wrong. I did this because I did the equation -log(7.6*10^-4) and got

    asked on April 20, 2015
  15. Chemistry

    How many moles of chlorine are there in 16.0 mL of 0.450 M CaCl2? 0.0072 mol 0.0144 mol 0.0216 mol 0.0375 mol none of the above I had chose 0.0072 and had submitted it in my assignment, but it had said it was wrong. I chose 0.0072 because I did this

    asked on April 20, 2015
  16. Chemistry

    Four sets of conjugate acid/base pairs and Ka of the acid are given. Which pair would be the best to form a buffer at pH = 9.2? You can use the Henderson-Hasselbalch equation to answer this question. HCNO/CNO- 3.5 x 10-4 HC2O4-/C2O4- 5.1 x 10-5 H2CO3/HCO3-

    asked on April 20, 2015
  17. Chemistry

    The Ka for the reaction of acetic acid and water is 1.8 x 10-5. Which of the following statements is true at pH 7? A.) there is much more acetic acid than acetate ion B.) there is more acetate ion than acetic acid C.) the concentration of acetate ion is

    asked on April 7, 2015
  18. Chemistry

    The ethylammonium ion, CH3CH2NH3+, has a pKa of 10.81. It reacts with water to form ethylamine, CH3CH2NH2 and H3O+. Which of the following statements is true at pH 7? A.) ethylamine predominates B.) ethylammonium ion predominates C.) the pH is higher than

    asked on April 7, 2015
  19. physics

    A 0.205 kg bird flying along at 7.8 m/s sees a 0.029 kg insect heading straight toward it with a speed of 15 m/s (as measured by an observer on the ground, not by the bird). The bird opens its mouth wide and enjoys a nice lunch. What is the bird's speed

    asked on March 30, 2015
  20. Statistics and Probability

    Mallory has a credit score of 680 and she is offered and interest rate of 8.3%. is this a good offer? Explain your answer.

    asked on December 8, 2014
  21. Algerbra math

    (7x^2+3x+9)+(2x^2+5x-2)

    asked on October 1, 2014
  22. Calculus

    2x -------- (x-2)(x+2) using partial fractions That's supposed to be a division sign of some sort

    asked on May 22, 2014
  23. Calculus

    find the co-ordinates y=x(2-x) where the gradient is 2

    asked on May 21, 2014
  24. Calculus

    1/X by first principles

    asked on May 21, 2014
  25. Calculus

    A fragment of bone is discovered to contain 20% of the usual carbon-14 concentration. Estimate the age of the bone to the nearest hundred years, given that Carbon-1 is radioactive with half-life of 5730 years and the rate of decay is given by the following

    asked on May 21, 2014
  26. Calculus

    Find the volume of the solid generated by rotating about the y axis the area in the first quadrant bounded by the following curve and lines. y=x^2, x=0, y=2.

    asked on May 21, 2014
  27. Survey Math help

    A movie complex has eight different movie theaters. The manager of the complex wants to conduct a survey to determine which snacks to add to the menu. Which represents the best sample the manager could use for the survey? Would I do specific ages the first

    asked on May 1, 2014
  28. Coordinates Math"Steve"

    Is the proportional? x: 1 3 4 6 y: -4 -12 -16 -24 I think it is. Am I correct?

    asked on April 25, 2014
  29. Geometery help"Steve"

    The point Q(x,y) is reflected in the origin. Use arrow notation to describe the original point and its reflection. I chose this: (x,y) to (x,y) Am I right?

    asked on April 25, 2014
  30. Help me solve??

    XYZ has vertices X(5,6), Y(9,12), and Z(12,8). it is translated right 8 units and up 3 units. What are the coordinates of X', Y', and Z' ?

    asked on April 25, 2014
  31. Math

    If you put me into 7 equal groups with 3 in each group and 5 are left over, what number am I?

    asked on March 6, 2014
  32. what??

    im not trying to fool anything this is not a name change.MS.SUE Im not trying to be disrecptful since you do help a lot of kids but I also have talking to a lot of kids to and they say that sometimes your very rude and mean....im just trying the help the

    asked on January 8, 2014
  33. math

    I just saw this guy post this here and I think he needs help??? A recipe calls for 4 pounds of fruit.you have 60 ounces of fruit. A.do you have as much fruit as you need? B.if not,how much more do you need?

    asked on January 8, 2014
  34. history

    trouser wearing members of a revolutionary uprising of the french working class were called the___________?

    asked on November 29, 2013
  35. history

    the ____ act required king______ 1 to convene parliament every three years. is it parliament,king charles?

    asked on November 29, 2013
  36. PHYSICS

    Two 75 kg hockey players skating at 5.50 m per s collide and stick together. if the angle between their initial directions was 120 degress, what is their velocity after the collision?

    asked on November 6, 2013
  37. Chemistry

    Anhydrous aluminum oxide can be reduced to aluminum according to thisa chemical equation: 2 Al2O3 (s) ---> 4 Al (l) + 3 O2 (g) Calculate the mass of aluminum oxide reacted if 82 g of Al was produced and the percent yield was found to be 89.3%

    asked on October 19, 2013
  38. Chemistry

    What mass of copper(II) nitrate would be produced from the complete reaction of 65.3 g of copper, according to the chemical reaction shown below? Cu + 2 AgNO3 ----> Cu(NO3)2 + 2 Ag Use the masses to two decimal places using the periodic chart in the front

    asked on October 19, 2013
  39. chemistry

    a. How many atoms of hydrogen are in 25.0 g of ammonia (NH3)? Use the format 6.02E+23 for 6.02 x 1023 b. How many atoms of nitrogen are in the same amount of ammonia? Use the molar mass to two decimal places found on the periodic table in the front of your

    asked on October 19, 2013
  40. calculus

    Meg's pension plan is an annuity with a guaranteed return of 4% per year (compounded quarterly). She would like to retire with a pension of $20,000 per quarter for 10 years. If she works 30 years before retiring, how much money must she and her employer

    asked on September 17, 2013
  41. Chem

    Caculate the volume of CO2 gas given off at 756 mm Hg and 23C when 150 kg of limestone(CaCO3) is heated until it decomposes according to the following reaction:CaCO3(s)=CaO(s)+CO2(g)

    asked on March 13, 2013
  42. science

    Which of the following is true about an object that floats in water? (1 point) The object is less dense than frozen water. The mass of the object is less than that of water. The density of the object is less than that of water. The volume of the water is

    asked on March 1, 2013
  43. Physics

    The focal length of the objective of a telescope is 0.2 m and the eyepiece has a focal length of 1.6 m. What is the length of the telescope? A. 1.8 m B. 1.4 m C. 1.6 m D. .90 m E. 8.0 m

    asked on January 20, 2013
  44. english

    Please help me write an essay. the question is "What do you think the theme is of Our Town and how is it shown?"

    asked on January 6, 2013
  45. Math word problem

    Patsy has cheerleading practice on every fourth school day. She wants to be in the school play, but they have practice on every sixth school day. If both started on September 5th, what would be the first date that she has to choose between cheerleading and

    asked on December 6, 2012
  46. Math help!

    Jack has the following scores on exams in his math class. 81, 87, 93, 89, 61, 81 If he wants to make his performance sound as good as possible, which measure should he use—the mean, the median, or the mode of his exam grades when he talks about how he is

    asked on October 10, 2012
  47. statistics

    The average temperature in households is 67.6 degrees F. The standard deviation is 4.2 degrees F. A random sample of 51 households is to be selected What is the probability that the average of this sample will be within 1.4 STANDARD ERRORS of the

    asked on September 28, 2012
  48. english

    a good thesis statement on why teachers should have the authority to remove disruptive students from their classes permanently.

    asked on September 28, 2012
  49. History

    How did england change after its war with spain? and How did this change played a role and part in history by analyzing the magnitude and scope?

    asked on September 23, 2012
  50. science

    A conatiner filled with marbles weighs 435 grams. The container weighs 28 grams. What is the mass of the marbles?

    asked on September 19, 2012
  51. education

    Read the following scenario: You are a second-grade teacher at Happy Valley Elementary School. You are teaching language arts and social studies. Your classroom of 21 students consists of 7 white students, 5 Latino students, 4 African American students, 3

    asked on September 16, 2012
  52. Economics

    2. If a firm increases all of its inputs by 60 percent and its output increases by 90 percent, then you know that: A) it is encountering diseconomies of scale. B) it is encountering economies of scale. C) it is encountering constant returns to scale. D)

    asked on September 14, 2012
  53. Economics

    Suppose that a tour bus business incurred implicit costs of $600,000 and explicit costs of $7 million in a specific year. If the firm sold 125,000 tours at $60 per person, its accounting: A) profits were $100,000 and its economic profits were $500,000. B)

    asked on September 14, 2012
  54. Chemistry

    A rock sample contains only Sb2S3 and FeS. If 835g of the sample contains 11.2% antimony, what is the mass percent of the Sb2S3 in the sample? What is the mass percent of the sulfur in the sample? So far, I have determined that 11.2% of an 835g sample is

    asked on August 31, 2012
  55. Chemistry

    100 ml of 0.01N HCl is added to 0.9L of distilled water. What would the final pH of the solution be?

    asked on August 30, 2012
  56. Introduction to HS

    I am having trouble with a question. In order to get an idea of significant subject areas in a chapter, it is best to read the. A. Subheads B. Graphics C. Captions D. Table of contents In my study guide it states : Read all the subheadings and

    asked on July 25, 2012
  57. business stat

    1. Suppose quality control inspectors at the coffee house chain take a sample of 100 pieces of this chocolate product from an incoming shipment. They find a sample average of 60% cacao with a standard deviation of 8%. What is the standard error of the

    asked on July 23, 2012
  58. Chemistry

    If you reclaim 0.250g Ag from AgNO3, how much AgNO3 did you have to begin with?

    asked on July 16, 2012
  59. Physics

    A 3.30-kN piano is lifted by three workers at a constant speed to an apartment 28.8 m above the street using a pulley system fastened to the roof of the building. Each worker is able to deliver 197 W of power, and the pulley system is 75.0% efficient (so

    asked on June 18, 2012
  60. Physics

    If a projectile is launched from Earth with a speed equal to the escape speed, how high above the Earth's surface is it when its speed is three-fifths the escape speed? I keep getting the answer 2.56x10^6 m after solving it a few different ways. Help would

    asked on April 28, 2012
  61. geometry

    Factor 15x^2 - 8x - 16

    asked on March 9, 2012
  62. algebra 2/math

    how do i factor x^3+2x^2-x-2

    asked on March 1, 2012
  63. algebra

    X^2-4x=0

    asked on February 22, 2012
  64. chemistry

    design a simple lever that could be raised and lowered smoothly using niitinol wires.

    asked on February 16, 2012
  65. Physics

    A driver in a car traveling at a speed of 56.0 mi/h sees a deer 116 m away on the road. Calculate the minimum constant acceleration that is necessary for the car to stop without hitting the deer (assuming that the deer does not move in the meantime).

    asked on February 2, 2012
  66. AP Chemistry

    This is part of a marathon problem, we have to identify the five compunds of H, N, and O described below. For each compound, I have to write a Lewis structure that is consistent with the information given. a.) All the compunds are electrolytes, although

    asked on December 5, 2011
  67. Physics.

    What is the transfer mechanism of energy, momentum, and angular momentum?

    asked on November 27, 2011
  68. Physics help please

    suppose you have 2 cars, and the larger one is twice as massive as the smaller one. If you and a friend push on them so that their accelerations are equal, how must the forces applied to the cars compare? a. the force on the larger car is equal to that on

    asked on November 27, 2011
  69. algebra

    Suppose D=(w+2)(w-3)(w+6).For what three values of w will D have a value of 0?

    asked on November 22, 2011
  70. Chemistry

    If solution A had a pH of 8, and solution B had 1,000 times this hydrogen ion concentration what would be the pH of solution B, and would solution B be acidic or basic?

    asked on November 14, 2011
  71. trig

    find the coordinates of the terminal point on the unit circle determined by t=9pt/7 to two decimal places

    asked on November 13, 2011
  72. Physics

    The position vector r of a particle moving in an xy plane is given by [r = (6t^3-3t)i + (4-1t^4)j] with r in meters and t in seconds. What is the angle between the positive direction of the x axis and a line tangent to the particle's path at t = 3 s? Give

    asked on September 25, 2011
  73. Math

    To subtract 91 from 99, do you need to regroup? Explain

    asked on September 19, 2011
  74. Math

    To subtract 91 from 99, do you need to regroup? Explain

    asked on September 19, 2011
  75. 3rd math

    Bethany has 40 apples. Write a subtraction story about the apples that would require regrouping. Then write the answer in a complete sentence.

    asked on September 19, 2011
  76. physics

    a rocket blasts off and moves up with an acceleration of 12 m/s2 until it reaches 30 m then the engine shuts down and the rocket continues in free fall. What is the max hieght of the rocket and what is the total duration of the rockets flight?

    asked on September 1, 2011
  77. chemistry

    When 0.100 mol of carbon is burned in a close vessel with 8.00g of oxygen, how many grams of carbon dioxide can form?

    asked on July 25, 2011
  78. grammar

    A Superblade was used at the 2 o'clock position, and the anterior chamber was entered was used is a verb ,was entered is also a verb ,am i right

    asked on June 15, 2011
  79. Thermodynamics

    An intrepid explorer takes 400 g of ice from the cold Siberian environment, where the temperature is –40 degrees and places it in a kettle inside his mobile laboratory. The ice melts and he heats the water to +40 degrees. What is the total amount of heat

    asked on June 6, 2011
  80. algebra

    simplify and write using only positive exponents. thanks. (2x^3y^4)^-2 divided by (8xy^6)^-3

    asked on May 25, 2011
  81. Chemistry

    write the balanced equation for the ionization of the weak base pyridine, C5H5N, in water

    asked on May 8, 2011
  82. chemistry dilutions

    you have 47 mL of a 2 M stock solution that must be diluted to .5 M how much water should you add

    asked on May 6, 2011
  83. calculus

    The function f is continuous on the closed interval [0,6] and has values that are given in the table below. x |0|2|4|6 f(x)|4|K|8|12 The trapezoidal approximation for(the integral): 6 S f(x) dx 1 found with 3 subintervals of equal length is 52. What is the

    asked on May 3, 2011
  84. Chem 100

    at 1 atm how much energy is required to heat 67 grams of H2O(s) at -22 degrees C to H2O(g) at 159 degrees C

    asked on May 1, 2011
  85. 4th grade math

    Find a rule that gives the third number from the first two numbers. Fill in the blanks.....10, 4, 5, ? 15, 7,7, ? 19,9,?

    asked on March 18, 2011
  86. Chemistry

    I don't understand how you know what state designation things are in a chemical equation. For example this is given: 2 (NH4)3PO4 (__) + 3 Ba(NO3)2 ---> Ba3(PO4)2 (__) + 6 NH4NO3 (__) How do you just know what to put for their state or phase designation?

    asked on March 10, 2011
  87. reimbursement methodologies

    does anyone have answers to test 38181803 for penn foster

    asked on February 19, 2011
  88. Physics

    A coiled Hookean spring is stretched 10 cm when a 1.5kg mass is hung from it. Suppose a 4 kg mass hangs from the spring and is set into vibration with an amplitude of 12 cm. A. Find the force constant of the spring. B. Find the Maximum restoring force

    asked on February 16, 2011
  89. algebra

    -9 + 36 divided by 6 times 2 -(-6) - 5 +2 = ? I'm having trouble with the order of operations.

    asked on February 16, 2011
  90. math

    An urn holds 13 identical balls except that 2 are white, 4 are black, and 7 are red. An experiment consists of selecting two balls in succession without replacement and observing the color of each of the balls. How many outcomes are in the sample space for

    asked on February 2, 2011
  91. math

    An urn holds 13 identical balls except that 2 are white, 4 are black, and 7 are red. An experiment consists of selecting two balls in succession without replacement and observing the color of each of the balls.

    asked on February 2, 2011
  92. math

    please explain how to get the answer to this question. five students make the following guesses on the number of jelly beans in a jar: 72, 78, 68, 60 and 84. the guesses were off by 14, 2, 4, 6 and 10 (not in order). how many jelly beans are in the jar?

    asked on January 27, 2011
  93. math

    five students make the following guesses on the number of jelly beans in a jar: 72, 78, 68, 60 and 84. the guesses were off by 14, 2, 4, 6 and 10 (not in order). how many jelly beans are in the jar?

    asked on January 27, 2011
  94. general

    kristin nhas found answers and no longer needs help thank you

    asked on January 26, 2011
  95. general law

    Dr. Bob applies for medical staff privileges at General Hospital. The hospital administrator? A. is not required to look into Dr. Bob’s background. B. is required to query the National Practitioner Data Bank. C. is required to query the Data Bank unless

    asked on January 26, 2011
  96. penn foster

    Dr. Bob applies for medical staff privileges at General Hospital. The hospital administrator? A. is not required to look into Dr. Bob’s background. B. is required to query the National Practitioner Data Bank. C. is required to query the Data Bank unless

    asked on January 26, 2011
  97. law

    Dr. Bob applies for medical staff privileges at General Hospital. The hospital administrator? A. is not required to look into Dr. Bob’s background. B. is required to query the National Practitioner Data Bank. C. is required to query the Data Bank unless

    asked on January 26, 2011
  98. law

    news paper calls a rehab clinic and asks if a celebrity is a patient..clinic should: lie, tell ytruth, acknowledge shes there but give no details, say its prohibited

    asked on January 26, 2011
  99. Western Civ Please Help : )

    Explain the Difference during the Roman Empire on what Augustus says about himself and what Tacitus says about Augustus

    asked on November 28, 2010
  100. Chemistry

    The standard enthalpies of formation of ions in aqueous solutions are obtained by arbitrarily assigning a value of zero to H ions;that is, delta H(f) [H+(aq)]=0 A.for this reaction: calculate delta H(f) for the Cl- ions. HCl(g) ==H2O==>H+(aq)+Cl-(aq) delta

    asked on November 1, 2010

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