Posts by kelly

Total # Posts: 1,820

  1. Chemistry III

    Assume you dissolve 0.240 g of the weak acid benzoic acid, C6H5CO2H, in enough water to make 1.16 102 mL of solution and then titrate the solution with 0.153 M NaOH. C6H5CO2H(aq) + OH -(aq) C6H5CO2-(aq) + H2O(l) (a) What was the pH of the original benzoic acid solution? (b) ...
  2. Chemistry II

    You place 1.234 g of solid Ca(OH)2 in 1.00 L of pure water at 25°C and it partially dissolves. The pH of the solution is 12.40. Estimate the Ksp for Ca(OH)2.
  3. Chemistry

    A 20.2 mL sample of a weak monoprotic acid, HX, requires 50.0 mL of 0.060 M NaOH to reach the equivalence point. After the addition of 30.0 mL of NaOH, the pH is 5.50. What is the Ka of HX?
  4. arithmetic

    The pet shop owner told jean to fill the new fish tank 3/4 full of water.Jean filled the tank 9/12 full.What fraction of the tank does she still need to fill?
  5. statistics

    A student is interested in whether students who study with music playing devote as much attention to their studies as do students who study under quiet conditions (he believes that studying under quiet conditions leads to better attention). he randomly assigns participants to ...
  6. CHEMISTRY HELP NEEDED!!

    Given info: Reaction: 3A+2B--->2C+D {A] (mol/L) 1.0 ×10^-2 1.0 ×10^−2 2.0 ×10^−2 2.0 ×10^−2 3.0 ×10^−2 [B] (mol/L) 1.0 3.0 3.0 1.0 3.0 Rate of appearance of C (mol/L-hr) 0.30×10^−6 8.10×10^−6 3....
  7. Chemistry

    Given info: A] (mol/L) [B] (mol/L) Rate of appearance of C (mol/L-hr) 1.0 ×10^-2 1.0 0.30×10^−6 1.0 ×10^−2 3.0 8.10×10^−6 2.0 ×10^−2 3.0 3.24×10^−5 2.0 ×10^−2 1.0 1.20×10^−6 3.0 ×10...
  8. Chemistry

    calculate the specific rate constant between substances A and B has been found to given data 3A + 2B ---> 2C + D
  9. Chemistry

    calculate the specific rate constant A] (mol/L) [B] (mol/L) Rate of appearance of C (mol/L-hr) 1.0 ×10^-2 1.0 0.30×10^−6 1.0 ×10^−2 3.0 8.10×10^−6 2.0 ×10^−2 3.0 3.24×10^−5 2.0 ×10^−2 1.0 1.20×...
  10. Chemistry

    calculate the specific rate constant A] (mol/L) [B] (mol/L) Rate of appearance of C (mol/L-hr) 1.0 ×10^-2 1.0 0.30×10^−6 1.0 ×10^−2 3.0 8.10×10^−6 2.0 ×10^−2 3.0 3.24×10^−5 2.0 ×10^−2 1.0 1.20×...
  11. Chemistry

    collect the specific rate constant....
  12. Chemistry

    calculate the specific rate constant A] (mol/L) [B] (mol/L) Rate of appearance of C (mol/L-hr) 1.0 ×10^-2 1.0 0.30×10^−6 1.0 ×10^−2 3.0 8.10×10^−6 2.0 ×10^−2 3.0 3.24×10^−5 2.0 ×10^−2 1.0 1.20×...
  13. Chemistry

    calculate the specific rate constant A] (mol/L) [B] (mol/L) Rate of appearance of C (mol/L-hr) 1.0 ×10^-2 1.0 0.30×10^−6 1.0 ×10^−2 3.0 8.10×10^−6 2.0 ×10^−2 3.0 3.24×10^−5 2.0 ×10^−2 1.0 1.20×...
  14. Chemistry

    How would you analyze a solution known to contain Hg22+ and Cu2+?
  15. PHYSICS

    Determine the value for the acceleration due to gravity at the surface of the planet Mars, given the following data: Mass of Mars = 6 .42 x 10^23 kg Radius of Mars = 3.37 x 10^6 m Thanks!
  16. CHEMISTRY

    Ppcl3 6.78 torr Pcl2 26.4 Ppcl5 224
  17. Math

    x^2+1/4x+_?__
  18. physics

    115.19
  19. Physics

    Take the radius of the earth's orbit to be 1.5 x 1011 m. a. Using a year to be 365 days, find the speed of the earth as it moves around the sun. __m/s b. Convert this speed to miles/hour (show your conversion factor in your written backup). __miles/hour
  20. Physics

    Take the radius of the earth at the equator to be 6380 km a. Find the speed the speed of an object at the equator due to the earth's rotation. ___m/s b. Convert this speed to miles/hour (show your conversion factor in your written backup). __miles/hour
  21. Stats

    Explain how to calculate margin of error. What effect does increasing your sample size have on the margin of error? What effect does it have on the confidence level? What effect does it have on the confidence interval?
  22. algebra

    a bag contains only nickels and dimes. there are exactly 18 coins in the bag. the amount of money in the bag is $1.25. let x represent the number of nickels in the bag. let y represent the number of dimes in the bag. 1. write a system of equations that correctly models this ...
  23. algebra

    you are planning a cookout. you figure that you will need at least 5 packages of hot dogs and hamburgers in total. a package of hot hods costs $1.90 and a package of hamburgers costs $5.20. you can spend a maximum of $20 in total on the hot dogs and hamburgers. Identify two ...
  24. algebra

    find each probability if you pick a card, do not replace it, then pick a second 3 white cards 5 black cards and you pick black, then white
  25. Stats

    Explain how to calculate margin of error. What effect does increasing your sample size have on the margin of error? What effect does it have on the confidence level? What effect does it have on the confidence interval?
  26. Stats

    Explain how to calculate margin of error. What effect does increasing your sample size have on the margin of error? What effect does it have on the confidence level? What effect does it have on the confidence interval?
  27. Math

    1.5x+4y=8 x+y=7 Please help me solve this system of equation and show your work.
  28. chemistry

    How many liters of 0.101 m NaCl contains 1.70 mol of this salt? Assume this solvent is H2O. Answer in units of L I do not understand what i am looking for or how to solve for it. Steps would be appreciated.
  29. algebra

    A DVD player's laser reader helps to "read" the information on the DVD. A particular laser reader measures 0.56 micron thick. does this fall with the required standards if a company uses |t - 0.03 | <= 0.525 for determining the part to be acceptable?
  30. algebra

    A typical DVD can store between 137.9 and 142.1 minutes of data before it is considered full. write an absolute value inequality describing the minutes of data (w) a full DVD will hold.
  31. algebra

    A bump on a DVD needs to be between 0.45 and 0.55 micron wide and 0.95 and 0.99 micron high. write two absolute value inequalities describing the width (x) and height (y) of the bump.
  32. biology

    suggest a reason for the failure of some of the molecules to diffuse through the semipermeable membrane.
  33. Chemistry

    .28C = 30C * x/.2kg x = .001867 moles S .001867 moles S = .48g S/x x = 8.0177 molecular formula for S Is this correct?
  34. Chemistry

    If 0.48 g of sulfur are added to 200 g of carbon tetracholoride, and the freezing point of the carbon tetrachloride (Kf=30 degrees C/m) is depressed by 0.28 degrees C, what is the molar mass and molecular formula of the sulfur? .48g * 1mol/32.07g= .01497 mol S .01497/.2 kg = ....
  35. Chemistry

    .48g * 1mol/32.07g= .01497 mol S .01497/.2 kg = .07485 molality 273.28K= i * 293K * .07485 i = .08 ??
  36. Chemistry

    thank you :)
  37. Chemistry

    If 0.48 g of sulfur are added to 200 g of carbon tetracholoride, and the freezing point of the carbon tetrachloride (Kf=30 degrees C/m) is depressed by 0.28 degrees C, what is the molar mass and molecular formula of the sulfur?
  38. math

    Assume that you randomly select 8 cards from a deck of 52. What is the probability that all of the cards selected are hearts?
  39. Math

    A group of students who are selecting 2 of their group at random to give a report, but assume that there are 5 males and 3 females. What is the probability that 2 females are selected? 2 males?
  40. Math

    Assume that you select 2 coins at random from 5 coins: 3 dimes and 2 quarters. What is the probability that all of the coins selected are dimes?
  41. sociology

    Social capital refers to the collective value of all "social networks" [who people know] and the inclinations that arise from these networks to do things for each other ["norms of reciprocity"].
  42. sociology

    cultural capital is defined as “forms of knowledge, both tangible and intangible, that have value in a given society in relation to status and power Cultural capital defines how people (human) engage each other (social) and their resources (economic).
  43. sociology

    what are some examples of social and cultural capital that young children experience
  44. Physics

    A 1.7 cm thick bar of soap is floating in water, with 1.1 cm of the bar underwater. Bath oil with a density of 890.0 kg/m3 is added and floats on top of the water. How high on the side of the bar will the oil reach when the soap is floating in only the oil.
  45. Physics

    A 1.7 cm thick bar of soap is floating in water, with 1.1 cm of the bar underwater. Bath oil with a density of 890.0 kg/m3 is added and floats on top of the water. How high on the side of the bar will the oil reach when the soap is floating in only the oil.
  46. math

    45 1/5 x 3/4 =
  47. biology

    the importance of these organic compounds ( carbohydrates, proteinds, lipids) in the cells and tissues of living things
  48. Physics

    A ball is thrown upward from the top of a 50.0 m tall building. The ball's initial speed is 12.0 m/s. At the same instant, a person is running on the ground at a distance of 44.0 m from the building. What must be the average speed of the person if he is to catch the ball ...
  49. English

    yes i read it but i dnt understand it
  50. launguge arts

    I need to un scramble these words and make new ones help eioubdhrs
  51. bio101

    2. Find a media piece—article, video, presentation, song, or other—that recognizes the fundamental concepts of chemistry in biology. Include the link or reference citation for the piece and describe how it helped you better understand how fundamental concepts of ...
  52. math

    Joe and Bob manufacture bikes. Joe can make 12 bikes in 8 hours while Bob can make 12 bikes in 6 hours. Working together how many hours will it take them to make 12 bikes? Please explain showing steps so I can learn it. I don't just need the answer. Thanks! PS I originally...
  53. math

    Joe and Bob manufacture bikes. Joe can make 12 bikes in 8 hours while Bob can make 6 bikes in 12 hours. Working together how many hours will it take them to make 12 bikes? Please explain showing steps so I can learn it. I don't just need the answer. Thanks!
  54. physics

    A soccer player kicks the ball toward a goal that is 27.8 m in front of him. The ball leaves his foot at a speed of 18.5 m/s and an angle of 30.4° above the ground. Find the speed of the ball when the goalie catches it in front of the net. (Note: The answer is not 18.5 m/s...
  55. algebra

    here's the rest of the info there is angle on one triangle measured 15.5 ft and on another triangle 5ft2 inn and 7ft 9 in
  56. algebra

    Jenny is 5ft 2in. tall. To find the height of a light pole, she measured her shadow and the pole shadow What is the height of the pole?
  57. biology

    Hydrochloric acid
  58. algebra

    determine whether 17 is a solution of the equation 5x+7 = 92
  59. chemistry

    Can somone please explain how to do this problem: How many cubic centimeters of olive oil have the same mass as 1.00L of gasoline? the density of gas is .66g/ml and olive oil is .92g/ml Thank you for your help
  60. chemistry

    Sorry, it's an 8.0 oz box so there are 16 servings in the box Thanks
  61. chemistry

    how many grams of sodium are used to prepare 50 boxes of crackers? sodium per serving is 140mg, serving size is .50 oz for 6 crakers. i got 112g and the answer is suppose to be 110g and i cant figure out how to get 110 thank you
  62. chemistry

    why are the atoms in metallic bonds positively charged?
  63. physics

    1. Calculate the radius of orbit for a hydrogen electron in the n=3 level. 2.The half life of an unknown substance is one minutes. If the initial number of particles is 20 how many particles will remain after two minutes have elapsed?
  64. myths

    what are some modern day myths?
  65. Math, Quadratics

    Farmer John is building a pen to keep his pig in. John has 40m of fencing. He will only need to make 3 sides to the pen because the 4th side will be along a barn. If John wants the maximum area what should the side lengths of the pen be?
  66. Math, Quadratics

    Hi Damon, I got the same answer as you up to the equation x^2 + 30x - 200=0, but after that I don't understand what happened after that.. where does the 900 and 800 come form? and why you do divide by 2? thanks
  67. Math, Quadratics

    Adam has a hockey rink in his backyard. The current dimensions are 10m by 20m. Adam wants to have a hockey tournament and needs to double the area of his hockey rink. How much must Adam increase each dimension if he wants to increase them the same amount?
  68. physics

    A rocket is fired at a speed of 75.0 m/s from ground level, at an angle of 59.7° above the horizontal. The rocket is fired toward an 11.0 m high wall, which is located 28.5 m away. The rocket attains its launch speed in a negligibly short period of time, after which its ...
  69. Chemistry

    What mass of sodium bromide (NaBr) is required to make 250 cm3 of a 0.35 mol.dm-3 solution?
  70. Chemistry

    320g of sulfur dioxide react with 32.0g of oxygen and excess water to form sulfuric acid (H2SO4) a. What is the limiting reagent? b. What is the theoretical yield of product? c. How many grams of excess reagent will remain?
  71. Chemistry

    Ethane (C2H6) reacts with oxygen to produce carbon dioxide and water. Assuming there is an excess of oxygen, calculate the mass of CO2 and H2O produced from 1.25 g of ethane
  72. 7th grade Math

    Sorry Eric, yes I did mean 43 (typo sorry)
  73. 7th grade Math

    Assume that there are 100 marbles in each bag. Firstly divide 100 by 7 (ratio 4:3) 14.28. Multiply 14.28 by 4 = 57.12 *57 marbles Mulitply 14.28 by 3 = 42.84 *53 marbles Secondly do the same for ratio 3:2 Divide 100 by 5 = 20 Multiply 20 by 3 = 60 marbles Multiply 20 by 2 = 40...
  74. fifth grade math

    Daughter has homework problem. P(3,6) is only thing listed. ?
  75. math

    Correction...it is supposed to be P(6,3)
  76. math

    We don't understand
  77. math

    P(3,6)
  78. statistics

    Scores on a certain nationwide college entrance examination follow a normal distribution with a mean of 400 and a standard deviation of 100. Find the probability that a student will score over 500.
  79. algebra

    which measure will remain the same if Jarod next three quiz score are 96,93,and 93 a.mode b.range c.mean d.median
  80. geometry

    Its a if, then question. It says If I get another chance, then I will do better. And 'i get another chance is lined' what would it be? Like would it still be a hypothesis without the 'if' underlined? Would it be the argument?
  81. physics

    A roof rises 1.7 feet vertically and 13.3 feet horizontally. What is the grade of the roof in percentage
  82. Spanish

    NO its (Ella es americana.)
  83. algebra

    what is the sq root property of 2x^2=26
  84. Physics

    In 35.0 s, a pump delivers 0.574 m3 of oil into barrels on a platform 25.5 m above the intake pipe. The oil's density is 0.820 g/cm3.
  85. math word problem

    A rectangle garden is 30 ft by 40 ft. Part of the garden is removed in order to install a walkway of uniform width around it. The area of the new garden is one-half the area of the old garden. How wide is the walkway?
  86. math

    The number 33 bus arrives at the corner of Coldspring and Hillen every 15 minutes. The number 40 bus arrives at the same corner every 46 minutes. If both buses leave the corner at 9:08 am, when is the next time the buses arrive at the corner at the same time?
  87. Algebra

    Thank you.
  88. Algebra

    Divide: (20b^(3)+17b^(2)+18b+43)÷(4b+5)
  89. Algebra

    Thank you.
  90. Algebra

    3y-24/14 divided by y-8/4y
  91. Algebra

    Thank you.
  92. Algebra

    Solve for x. 4x(x-1)-5x(x)=3
  93. english

    What is the word ball in this sentence? The young boy played ball in the yard. adverb?
  94. PARAPHRASING CONFUSION PLEASE HELP???

    I need help with this and have no clue as to what I should do. I have trouble with paraphrasing. Review the following passage and paraphrase the long passage in the following box. Use the reference to create an appropriate APA-formatted, in-text citation. Additionally, include...
  95. Algebra

    Thank you very much!!
  96. Algebra

    -4^2+44x-160=0 If you graphed the above equation, would the graph open up or down? How can you tell without graphing it?
  97. Algebra

    A farmer decides to enclose a rectangular garden, using the side of a barn as one side of the rectangle. What is the maximum area that the farmer can enclose with 100 ft of fence? What should the dimensions of the garden be to this given area? The maximum area that can be ...
  98. Algebra

    The length of a rectangle is twice the width. The area is 578 yd.^2. Find the length and width.
  99. Algebra

    Thank you.
  100. Algebra

    In the community you live, you have been asked to serve on the planning committee for the Fourth of July festival. Your committee has decided to begin meeting early to avoid some of the problems experienced in previous years. Unfortunately, those problems stemmed from poor ...
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