Lori

Most popular questions and responses by Lori
  1. Chemistry

    A 0.110-L sample of an unknown HNO3 solution required 52.1 mL of 0.150 M Ba(OH)2 for complete neutralization. What was the concentration of the HNO3 solution?

    asked on November 9, 2013
  2. Math

    What multiplication fact can be found by using the arrays for 2x9 and 5x9?

    asked on February 11, 2008
  3. Chem

    A patient receives 3.2 L of glucose solution intravenously (IV). If 100. mL of the solution contains 5.0 g of glucose (carbohydrate), how many kilocalories did the patient obtain from the glucose solution? *If anyone could help me with this, please show

    asked on September 3, 2018
  4. math word problems

    Sally and marta had the same number of postcards. After sally sold 18 of her postcards, marta had 4 times as many postcards as sally. How many postcards did each girl have to begin with?

    asked on October 2, 2011
  5. math

    there was 3/4 of a pizza left over from a family gathering. The next day, Tina ate 1/2 of what was left. How much of the whole pizza did Tina eat?

    asked on December 9, 2015
  6. Chemistry

    Balance the following equation in basic conditions CoCl2 (s) +Na2O2 (ag) ----> Co(OH)3 (ag)+Cl- (ag) + Na+ (ag)

    asked on November 21, 2014
  7. Chemistry

    in a particular redox reaction, MnO2 is oxidized to MnO4– and fe3+ is reduced to fe2+. Complete and balance the equation for this reaction in acidic solution. Phases are optional.

    asked on November 21, 2014
  8. chemistry

    For the following chemical reaction write the net ionic equation, including the phases. 2HBr (aq) +Ba(OH)2(aq) --> 2H2O(l) +BaBr2 (aq)

    asked on November 9, 2013
  9. Statistics

    In a department store there are 120 customers, 90 of whom will buy at least 1 item. If 5 customers are selected at random, one by one, find the probability that all will buy at least 1 item.

    asked on September 19, 2010
  10. Statistics

    Roll two standard dice and add the numbers. What is the probability of getting a number larger that 9 for the first time on the third time.

    asked on September 19, 2010
  11. singapore moth

    Place the following digits in the boxes so that the sum of the digits in each straight line is the same. This is like a crossword 3 boxes across and 3 boxes down then 3 boxes across and 3 boxes down using digits 1,2,3,4,5,6,7,8,9. please help with answer.

    asked on November 4, 2012
  12. Physics

    A spring stretches 0.150 m when a 0.30 kg mass is hung from it. The spring is then stretched an additional 0.100 m from this equilibrium point and released. Determine a). the spring constant, k, b). the maximum velocity of the mass, c. ) the maximum

    asked on February 23, 2013
  13. chemistry-stoichiometry

    how many grams of chlorine can be liberated from the decomposition of 64.0g of AuCl3 by this reaction 2 AuCl3----> 2 Au + 3cl2

    asked on May 19, 2008
  14. Chem

    Given the reaction: C8H16 + 12O2 --> 8CO2 + 8H2O How many moles of H2O are produced when 11.2 liters of C8H16 gas, measured at STP, reacts completely?

    asked on December 14, 2010
  15. chemistry

    The Haber process for ammonia synthesis is exothermic: N2(g) + 3H2(g) 2NH3(g) ∆H° = -92 kJ If the equilibrium constant Kc for this process at 500.°C is 6.0 ξ 10-2, what is its value at 300.°C?

    asked on March 8, 2012
  16. Statistics

    Working of a problem--I have found the mean, variance and the standard deviation from the following info: The probability that a cellular phone company Kiosk sells X number of new phone contracts per day is shown below---- X=4, 5, 6, 8, 10 P(X)=0.4, 0.3,

    asked on September 25, 2010
  17. College Physics PLEASE HELP

    A spring stretches 0.150 m when a 0.30 kg mass is hung from it. The spring is then stretched an additional 0.100 m from this equilibrium point and released. Determine a). the spring constant, k, b). the maximum velocity of the mass, c. ) the maximum

    asked on February 23, 2013
  18. calculus

    suppose the quantity demanded per week of a certain dress is related to the unit price p by the demand equation p=sqrt800-x. write the function that describes the revenue function? To maximize revenue how many dresses should be made and sold each week?

    asked on March 29, 2013
  19. ochemistry

    How many pi-electrons are in the thiazoline ring of thiamine hydrochloride? of thiamine?

    asked on July 5, 2011
  20. Chemistry

    if you dissolve 25.5 g of KBr in enough water to make 1.75 L of solution, what is the molarity of the solution

    asked on May 13, 2014
  21. pre-cal

    what are the steps to solve sec y sin (pi/2-y)=1

    asked on January 12, 2010
  22. calculus optimization problem

    A farmer has 460 feet of fencing with which to enclose a rectangular grazing pen next to a barn. The farmer will use the barn as one side of the pen, and will use the fencing for the other three sides. find the dimension of the pen with the maximum area?

    asked on March 30, 2013
  23. Statistics

    A multiple choice test consists of 60 questions. Each question has 4 possible answers of which one is correct. If all answers are random guesses, estimate the probability of getting at least 20% correct? Trouble with deciding p, n, q, and P (X)

    asked on October 8, 2010
  24. Analytical chemistry

    How many grams of solid CuSO4. 5H2O are needed to prepare a 500 ml of a 1000 ppm solution of Cu?

    asked on February 2, 2014
  25. Chemistry

    step by step, show how to balance C2H5OH + K2Cr2O7 + H2SO4 = Cr2(SO4)3 + K2SO4 + CH3COOH + H2O

    asked on November 11, 2014
  26. statistics

    Women comprise 80.3% of all elementary school teachers. In a random sample of 300 elementary teachers, what is the probability that more the 3/4 are women?

    asked on October 9, 2010
  27. Physics

    Runner A is initially 6.0 km west of a flagpole and is running with a constant velocity of 9. km/h due east. Runner B is initially 5.0 km east of the flagpole and is running with a constant velocity of 8.0 km/h due west. How far are the runners from the

    asked on September 25, 2006
  28. science

    Are there enough resources in the world for 8 or 10 billion people to live decent, secure, happy lives?

    asked on April 26, 2012
  29. Chemistry

    Which of the following mixtures of KCl in water is a saturated solution and which is an unsaturated solution; 1)100g of KCl in 100mL of H2O at 40°C 2)50g of KCl in 100mL of H2O at 70°C 3) 120g of KCl in 100mL of H2O at 60°C My data is: Temperature82°C

    asked on February 19, 2013
  30. Chemistry

    When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced. CaCO3 +2HCl yields CaCl2 +H2O +CO2 How many grams of calcium chloride will be produced when 29.0 g of calcium carbonate are combined with 13.0 g

    asked on September 22, 2013
  31. Chemistry

    The equilibrium constant for Br2 + Br Br3 at 25 degrees is 18. Calculate the equilibrium constant Br3 Br2 + Br

    asked on November 26, 2015
  32. Chemistry

    What is the mass of Na2SO4 is needed to make 1.5 L of 3.0 M solution? Na=23 g.: s = 32 g: O=16g.)

    asked on March 14, 2016
  33. Intermediate Accounting

    E6-10 Assume that Serena Williams desires to accumulate $1 million in 15 years using her market fund balance of $182,696. At what interest rate must Serena's investment compound annually? I came up with 12,179.733 per year; but know this is incorrect.

    asked on January 30, 2011
  34. Physics

    A femur is a bone in the leg whose minimum cross sectional area is about 4.0 x 10^-4 m^2. A compressional force in excess of 6.8 x 10^4 N will fracture this bone. A.) Find the maximum stress that this bone can withstand and B.) What is the strain that

    asked on February 23, 2013
  35. statistics

    A student takes a 20-question, true/false exam and guessed on each question. Find the probability of passing if the lowest passing grade is 15 correct out of 20.

    asked on September 26, 2010
  36. Stat

    An insurance company insures a person's antique coin collection worth $20,000 for an annual premium of $300. If the company figures that the probability of the collection being stolen is 0.002, what will be the company's expected profit?

    asked on September 26, 2010
  37. ochemistry

    Why might the presence of Benzoic acid be deleterious to the Benzoin condensation?

    asked on July 5, 2011
  38. Grammar

    what is the agreement error in the following sentence: One of the options concerning his future surgeries were discussed with him.

    asked on September 23, 2011
  39. Trig

    What is the exact value of cot(4pi/3)? Do not use a calculator.

    asked on February 28, 2010
  40. Chemistry

    A laboratory stockroom has a stock solution of 90%(m/v) sulfuric acid,H2SO4(aq). If a technician dilutes 50ml of the stock solution to a final volume of 300ml, what will be the new mass/volume percent concentration?(HINT: the dilution formula can be used

    asked on February 21, 2013
  41. Math

    A jar contains 6 red marbles and 10 blur marbles all of equal size. if Dominic were to randomly select 1 marble without replacement and then select another marble from the jar, what would be the probability of selecting 2 red marbles from the jar.

    asked on April 8, 2012
  42. Precalc

    Find the smallest positive answer to the equation: sin(2x)=1

    asked on April 7, 2010
  43. Psydag--stat

    An insurance company insures a person's antique coin collection worth $20,000 for an annual premium of $300. If the company figures that the probability of the collection being stolen is 0.002, what will be the company's expected profit?

    asked on September 26, 2010
  44. Chemistry

    How do you balance, step by step C2H5OH + K2Cr2O7 + H2SO4 = Cr2(SO4)3 + K2SO4 + CH3COOH + H2O?

    asked on November 11, 2014
  45. Chemistry Kb question need to clarify something

    the pKb for methylamine is 3.36, what is the Kb for methylamine? pKa+pKb= 14.00 Kb= 10^-pKb = 4.4x10^-4 is the answer but HOW?? what is punched into the calculator to get 4.4 x 10^-4??

    asked on December 16, 2010
  46. chemistry

    If 1.000 kcal of heat is added to 1.700 L of oxygen in a cylinder at constant pressure of 1.00 atm, the volume increases to 2.100 L. Calculate the total energy change for this process. Pay careful attention to units. Some plz help me :(

    asked on November 19, 2009
  47. Chemistry

    For the reaction of hydrazine (N2H4) in water, Kb is 3.0 10-6. H2NNH2(aq) + H2O(l) H2NNH3+(aq) + OH -(aq) Calculate the concentrations of all species and the pH of a 2.2 M solution of hydrazine in water. okay so i don't know how to do this problem because

    asked on February 14, 2009
  48. Algebra

    If 800ml of a juice drink is 15% grape juice, how much should be added to make a drink that is 20% grape juice?

    asked on October 8, 2012
  49. Chemistry

    What are the products for the reaction of Sodium hydrogen phosphate with nickel II nitrate Ni2HPO4 + Ni(NO3)2 -->

    asked on September 20, 2011
  50. Chemistry

    Hydrogen peroxide solution, H2O2(aq), is available with a concentration of 1.667mol/L. When diluted to a concentration of 0.25mol/L, the solution is used as a disinfectant. What volume of water should be added to 100 mL of the concentrated hydrogen

    asked on February 21, 2013
  51. Early Childhood Literacy

    Children with many experiences with stories: A-can accurately sound out words. B-tend to know stories have predicitable segments and features C-can read simple words as was or am by late preschool years. D-realize words are separated in sentences and that

    asked on July 4, 2012
  52. Social Stuides

    DURING THE 1840'S MANY MORE AMERICANS THAN BRITISH SETTLED IN THE OREGON COUNTRY HOW DID THIS INFLUENCE THE NEGOTIATION OVER THE TERRITORY

    asked on February 5, 2012
  53. physics

    a girl throws a stone vertically upward with an initial speed of 8 m/s. How high will the stone rise? How long will it take to return to the ground after it is thrown?

    asked on January 18, 2012
  54. Grammar

    Thx, Sue!!! Can u please help me with these others. Agreement errors: 1) Verb tense error 2) subject verb error 3) pronoun agreement error 4) modifer placement error 5) parallel structure error Q:The patient is thin, combative, uncooperative, oriented only

    asked on September 23, 2011
  55. Statistics

    What z-value corresponds to the 18th percentile?

    asked on October 3, 2010
  56. Chemistry

    15.0 moles of gas are in a 6.00L tank at 298.15K. Calculate the difference in pressure between methane and an ideal gas under these conditions. The van der Waals constants for methane are a=2.300 L^2*atm/mol^2 and b=0.0430 L/mol. I found the idea gas

    asked on September 13, 2012
  57. Probability and Stats

    A graduate class consists of six students. What is the probability that exactly three of them are born either March, June or November?

    asked on August 8, 2012
  58. Chemistry

    1.69 L of an aqueous solution containing 25.00 g of KCl dissolved in pure water is prepared. What is the molarity of the solution?

    asked on April 22, 2011
  59. Chemistry

    determine the number of grams of KCl salt contained in 1.25L of a 5.00%(W/V) KCl(aq)

    asked on July 18, 2011
  60. singapore math

    My 3rd grade son get this math problem. It states that John thinks of a 3-digit number. What is his number? Use the clues below to find John's number. Every digit is different. The sum of all thedigits is 19. The difference between the hundreds digit and

    asked on November 4, 2012
  61. chem

    The mole fraction of an aqueous solution of potassium perchlorate is 0.125. Assuming that the density of this solution is 1.20g mL-1, calculate the following: (A) the mass percent of potassium perchlorate in the solution. (B) the molarity of potassium

    asked on December 14, 2010
  62. written communication

    If you blank to visit your grandmother, you should go now; visiting hours will be ending soon.

    asked on May 13, 2015
  63. economics

    19-1 Bicycle Insurance and Information Asymmetry If bicycle owners do not know whether they are high- or low-risk consumers, is there an adverse selection problem? 19-2 IPOs and Adverse Selection Should owners of a private company contemplating an IPO (a

    asked on May 2, 2013
  64. statistics

    In a box of thirty AAA batteries, there are three defective batteries. Two batteries are randomly selected and tested. What is the probability that both are defective, if the first one is not replaced after being tested?

    asked on September 19, 2010
  65. Math

    Sara bought 2 boards of wood one board is 18 inches the other is 30 inches she wants to cut the wood into longest equal parts with no wood left over does Sara have enough wood for 10 equal size peices

    asked on February 3, 2016
  66. Algebra

    Take west to be the positive direction. The height of a sloped roof above the place where I stand is h = 18 feet (see the figure below). If I move x = 5 feet west, the height is 10 feet. What is the slope?

    asked on October 1, 2011
  67. physics

    A driver is moving at 32 m/s when they see a deer in the road standing 74m in front of them. They hit the brake and slow down at a constant rate of 9.5m/s2. Will the driver hit the deer? this is a 2 part problem

    asked on January 18, 2012
  68. probability

    If a soccer team won 60% of the games in which its players scored 5 or more goals, what is the probability of choosing a game in in which the team scored 0-4 goals and won the game? The season so far is they have won 3 games scoring 0-4 goals, won 3 games

    asked on December 8, 2016
  69. Chemistry

    In a laboratory, the following reaction is performed by combining 358 g of H2O and a sufficient amount of CaC2. The percent yield for this reaction is 94.5%. Calculate the actual yield of acetylene (C2H2) in grams from this reaction. CaC2 + 2H2O C2H2 +

    asked on May 1, 2016
  70. algebra

    3 shirts and 2 hats cost $52. 2 shirts and 1 hat cost $32. Find the cost of each.

    asked on May 25, 2015
  71. math

    Hannah and francine have $120. Hannah and peter have $230. Peter has 6 times as much money as francine. How much money does hannah have?

    asked on September 30, 2011
  72. financial management

    A capital project has an initial investment of $100,000 and cash flows in years 1-6 of $25,000, $10,000, $50,000, $10,000, $10,000, and $60,000, respectively. Given a 15 percent cost of capital, •(a) compute the net present value. . •(b) compute the

    asked on April 14, 2014
  73. Statistics

    If I deal you one card from a standard deck of 52 and it is a face card, I will give you a $5.00 bill. There are 12 face cards. There is one catch: You have to pay me something to play this game. How much would that be if the game is to be fair?

    asked on September 26, 2010
  74. Statistics

    The probability that a person owns a microwave oven is .75, that a person owns a compact disk player is .25, and that a person owns both a microwave and a CD player is .16. Find the probability that a person owns either a microwave or a CD player, but not

    asked on September 23, 2010
  75. American History

    What is a non example of Magna Carta

    asked on November 4, 2009
  76. economics

    19-1 Bicycle Insurance and Information Asymmetry If bicycle owners do not know whether they are high- or low-risk consumers, is there an adverse selection problem? 19-2 IPOs and Adverse Selection Should owners of a private company contemplating an IPO (a

    asked on May 2, 2013
  77. Chemistry

    Hi! I am doing this chemistry lab of solubility curve of a solid investigation and this is for KCl. The purpose of this lab is to investigate the relationship between the solubility of potassium chloride and the temperature of its solution and to create a

    asked on February 18, 2013
  78. Chemistry

    Hi! I am doing this chemistry lab of solubility curve of a solid investigation and this is for KCl. The purpose of this lab is to investigate the relationship between the solubility of potassium chloride and the temperature of its solution and to create a

    asked on February 18, 2013
  79. Statistics

    In a given normal distribution, the standard deviation is 14.4 and 8.27% of the distribution lies to the left of 60. What is the mean?

    asked on October 3, 2010
  80. algebra

    Find the variation constaant and an equation of variation where Y varies directly as X and Y = 72 hen X = 8 The variation constant is K = ? The equation of variation is Y = ? I think that K = 9 but not sure I don't have a clue about the rest.

    asked on August 17, 2010
  81. tribal government

    if the tribal government don't recognize judicial board does separation of powers still work

    asked on December 10, 2016
  82. Math w/business apps

    How much should be invested at 6% compounded monthly so that the investment will be worth $20,000 in six years?

    asked on April 8, 2016
  83. Math

    A room measures 3 m by 5 m. A scale drawing is to be made, using a scale of 1 cm=0.5. Find the dimensions of the scale drawing and provide sketch of this room drawn to scale.

    asked on April 11, 2015
  84. Math- Geometry

    Given: Angle ABC is a right triangle with hypotenus AB D,E and F are midpts of the sides of the triangle Proof: a. CDEF is a rectangle b. EC is half of AB

    asked on December 11, 2014
  85. Physics

    A cylindrically shaped piece of collagen is being stretched by a force that increases from 0 to 3.0 x 10^-2 N. The length and radius of the collagen are 2.5 and 0.091 cm. Young's Modulus is 3.1 x 10^6 N/m^2. a.) If the stretching obeys Hooke's Law, what is

    asked on February 23, 2013
  86. calculus

    An airplane is cruising at 340 km/h at an altitude of 4000 m. If the plane passes directly over an observer on the ground, how fast is the distance from the plane to the observer changing when it is 3000 m away from the point directly above the observer?

    asked on October 16, 2012
  87. social studies

    What is an example of a nonrenewable resource?

    asked on September 4, 2012
  88. physics

    A bullet penetrates 7 cm into a block of wood when fired at a speed of 33 m/s. Find the deceleration and the time taken to stop.

    asked on January 18, 2012
  89. Intermediate Accounting

    E6-5 Mike Finley wishes to become a millionaire. His money market fund has a balance of $92,296 and has a guarateed interest rate of 10%. How many years must Mike leave that balance in the fund in order to get his disired $1,000,000? I am getting $9,229.60

    asked on January 30, 2011
  90. chemistry needs another look plz

    Posted by Lori on Tuesday, December 14, 2010 at 5:38pm. The mole fraction of an aqueous solution of potassium perchlorate is 0.125. Assuming that the density of this solution is 1.20g mL-1, calculate the following: (A) the mass percent of potassium

    asked on December 14, 2010
  91. statistics

    A coin is weighted in such a way that a tail is twice as likely to occur as a head. If the coin is tossed twice, what is the probability of obtaining two tails?

    asked on September 20, 2010
  92. Algebra

    2 (3a - 4) - 2 (4a + 3) simplify 2 (a + 4) = 4 (a - 3)solve the equation Any help would be appreciated, I am still learning. Thanks!

    asked on March 31, 2010
  93. 8th grade

    FILM PROCESSING COSTS $4.95, PLUS 0.35 FOR EACH PICTURE PRINTED. MILAN PAID $11.95 FOR PROCESSING AND PRINTING. HOW MANY PICTURES DID HE HAVE PRINTED?

    asked on December 2, 2009
  94. College Math II

    If a ball is tossed into the air from a height of 6 feet with a velocity of 32 feet per second, then its altitude at time t (in seconds) can be described by the function A(t) = - 16t^2 + 32t + 6. Find the altitude of the ball at 2 seconds. I am having

    asked on November 21, 2009
  95. accounting

    Shelton Engineering completed the following transactions in the month of June. a. Shania Shelton, the owner, invested $105,000 cash, office equipment with a value of $6,000, and $45,000 of drafting equipment to launch the business. b. Purchased land worth

    asked on March 18, 2009
  96. Chemistry

    Did I do this correctly or do I need to try again? What is the mass percent of a solution when 18.6 g of table salt is added to 81.4 g of water? Mass Percent = mass of solute(g)x100 mass of solution (g) = 18.6 g x100 18.6 g + 81.4g = 18.6 g x 100 100g =

    asked on February 8, 2008
  97. Chemistry

    If the percent (mass/mass) for a solute is 6% and the mass of the solution is 300 g., what is the mass of solute in solution?

    asked on March 14, 2016
  98. Math

    A grade six class is having a fundraiser. The class boys have three bags of apples. Each bag has 24 apples. The total cost of the three bags of apples is $12.24. The class sells the apples for 0.75 each. How much will the class gain per apple?

    asked on May 7, 2015
  99. Math

    Hi! Can someone help me with these? I'm suppose to verify each idenity. Thanks! 1.) 1/tanθ +tanθ=sec^2θ/tanθ 2.) secθ-1/1-cosθ=secθ

    asked on January 19, 2015
  100. Calculus

    lim x->0 (sinx)^x

    asked on May 2, 2013

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