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

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

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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