Thursday

September 3, 2015
Total # Posts: 748

**chemistry**

A 20.0 gram sample is a mixture of sodium phosphate ,sodium mono-hydrogen phosphate,sodium dihydrogen phosphate and sodium chloride. The sample is dissolved in 100.0 ml of deionized water and titrated with 1.5 M hydrochloric acid. The initial pH of the solution is pH= 12.9. ...
*May 22, 2012*

**Honors Chemistry**

This is a few of my final review questions. I basically just need to know the steps for each one because my teacher doesn't explain them very well. I would really appreciate some help.
*May 21, 2012*

**Honors Chemistry **

1. .0025 M tartaric acid completely reacts with .0030 M of Al bicarbonate if .913 l of CO2 forms at 298 Kelvin with pressure of 1.4 ATM how much base used? 2. 3.1 x 10^23 molecules of .0035 M hydriodic acid reacts with 25 grams of magnesium bicarbonate how much carbon dioxide ...
*May 21, 2012*

**math**

m=4;(3,2)
*May 10, 2012*

**math**

Managers should consider ethical aspects of their decisions because:
*May 5, 2012*

**chemistry**

heeeeellppppppp
*May 4, 2012*

**algebra**

x^2 +4x +9y^2 -36y +4=0
*April 29, 2012*

**math**

v=lwh
*April 26, 2012*

**math**

1. x^2 + y^2 = 20 x+y=6 2. y=x^2-2x+1 y-3=x How would I go about solving these?
*April 26, 2012*

**chemistry**

need formula to this. Carbon monoxide reacts with oxygen to produce carbon dioxide. If 3.0 Liters of carbon monoxide at STP, how many liters of oxygen are required to run the reaction
*April 16, 2012*

**physics - college**

i think their is a mistake, the answer is incorrect
*April 15, 2012*

**physics - college **

An unmarked police car traveling a constant 95km/h is passed by a speeder traveling 14km/h .Precisely 2.50s after the speeder passes, the police officer steps on the accelerator; if the police car's acceleration is 2.30m/s^2 , how much time passes before the police car ...
*April 15, 2012*

**physics - college **

An unmarked police car traveling a constant 95km/h is passed by a speeder traveling 14km/h .Precisely 2.50s after the speeder passes, the police officer steps on the accelerator; if the police car's acceleration is 2.30m/s^2 , how much time passes before the police car ...
*April 15, 2012*

**chemistry**

The formate ion, (CHO2-), is related to the acetate ion and forms ionic salts with many metal ions. Assume that 9.7416 g of M(CHO2)2 (where M represents the atomic symbol for a particular metal) are dissolved in water. When a solution of 0.200 M sodium sulfate is added, a ...
*April 11, 2012*

**chemistry**

The formate ion, (CHO2-), is related to the acetate ion and forms ionic salts with many metal ions. Assume that 9.7416 g of M(CHO2)2 (where M represents the atomic symbol for a particular metal) are dissolved in water. When a solution of 0.200 M sodium sulfate is added, a ...
*April 11, 2012*

**english**

adverb phrase
*April 5, 2012*

**Math**

Tonya took out a loan to help pay for her house. She borrowed $50,000 for 15 years at a yearly simple interest rate of 5%. How much interest will she end up paying the bank?
*April 4, 2012*

**biology**

Its A, Mario is wrong
*March 21, 2012*

**Algebra**

If you have a rectangle and increase the length by 20% while decreasing the with by 20% what is the change equated at?
*March 21, 2012*

**calculus**

Find the first derivative for, (e^(x)+ e^(-x))^2
*March 4, 2012*

**Physics**

Because of the Earth's rotation, a plumb bob does not hang exactly along a line directed to the center of the Earth. How much does the plumb bob deviate from a radial line at 35.1° north latitude? Assume the Earth is spherical.
*February 25, 2012*

**calculus**

how did you find f(x)? i didn't know how to do it??
*February 25, 2012*

**calculus**

umm..i don't really know i i didn't know how to do it.. i don't even think i need that part anyway.....and i checked my work and it was x=4 not -4
*February 25, 2012*

**calculus**

Consider a differentiable functionf having domain all positive real numbers, and for which it is known that f'(x)=(4-x)^-3 for x.0 a. find the x-coordinate of the critical point f. DEtermine whether the point is a relative maximum or minomum, or neither for the fxn f. ...
*February 25, 2012*

**statistics**

Five independent samples, each of size n, are to be drawn from a normal distribution where sigma is known. For each sample, the interval (y-bar - 0.96 * sigma/sqrt(n), y-bar + 1.06 *sigma/sqrt(n)) will be constructed. What is the probability that at least four of the intervals...
*February 12, 2012*

**AP Chemistry**

Thank You
*February 7, 2012*

**AP Chemistry **

In the titration of 77.5 mL of 1.0 M methylamine, CH3NH2 (Kb = 4.4 10-4), with 0.38 M HCl, calculate the pH under the following conditions. (a) after 50.0 mL of 0.38 M HCl has been added (b) at the stoichiometric point
*February 7, 2012*

**AP Chemistry**

Thank you very much.
*February 7, 2012*

**AP Chemistry**

Consider 67.0 mL of a solution of weak acid HA (Ka = 1.00 10-6), which has a pH of 4.500. What volume of water must be added to make the pH = 5.000?
*February 7, 2012*

**Business management class**

On finding the proper correct answer. It's easier too First read test booklet. The answers will most of the time will be there.( Note I was only checking meanings ver's difinations with booklet & Google Online for proper choice.) Business Management as far being ...
*January 30, 2012*

**accounting**

E4-19 On December 31, the adjusted trial balance of Oslo Employment Agency shows the following selected data. Accounts Receivable $24,000 Commission Revenue $92,000 Interest Expense 7,800 Interest Payable 1,500 Analysis shows that adjusting entries were made to (1) accrue $4,...
*January 26, 2012*

**Sceince**

which of the following effects would also occur at the end of an Ice Age 1.) an increase in volcanic activity near the equator. 2.) a global rise in the sea level. 3.) a worldwide extinction of the reptiles. 4.)a shorte length of the day. 5.)a complete rearrangement of the ...
*January 13, 2012*

**AP Chem**

At a particular temperature, Kp = 0.25 for the following reaction. N2O4(g) 2 NO2(g) (a) A flask containing only N2O4 at an initial pressure of 5.3 atm is allowed to reach equilibrium. Calculate the equilibrium partial pressures of the gases. (b) A flask containing only NO2 at ...
*January 8, 2012*

**AP Chem**

At a particular temperature, K = 1.00 102 for the following reaction. H2(g) + I2(g) 2 HI(g) In an experiment, 1.23 mol H2, 1.23 mol I2, and 1.23 mol HI are introduced into a 1.00 L container. Calculate the concentrations of all species when equilibrium is reached.
*January 8, 2012*

**AP Chem**

At a particular temperature, K = 3.75 for the following reaction. SO2(g) + NO2(g) SO3(g) + NO(g) If all four gases had initial concentrations of 0.580 M, calculate the equilibrium concentrations of the gases.
*January 8, 2012*

**AP Chem**

At a certain temperature, 4.0 mol NH3 is introduced into a 2.0 L container, and the NH3 partially dissociates by the reaction. 2 NH3(g) N2(g) + 3 H2(g) At equilibrium, 2.0 mol NH3 remains. What is the value of K for this reaction?
*January 8, 2012*

**AP Chem**

The following reaction has Kp = 109 at 25°C. 2 NO(g) + Br2(g) 2 NOBr(g) If the equilibrium partial pressure of Br2 is 0.0159 atm and the equilibrium partial pressure of NOBr is 0.0768 atm, calculate the partial pressure of NO at equilibrium.
*January 8, 2012*

**math**

Today only a table is sold at a 28% discount. the sale price is now 666. what was the price yesterday?
*January 8, 2012*

**Pysics**

60*10=600m/s/s
*January 5, 2012*

**Question**

You take the SAT in 11th grade....
*December 30, 2011*

**algebra**

popcorn
*December 19, 2011*

**Calculus **

At 4 PM ship A is 40 miles due South Ship B. Ship A is sailing due South at a rate of 20 knots while ship B is sailing due East at a rate of 25 knots. Find the rate of change of the distance between the ships at 3 PM and at 5 PM. At what time were the ships closest together...
*December 12, 2011*

**AP Chemistry**

A solution is prepared by mixing 50.0 mL of 0.17 M Pb(NO3)2 with 50.0 mL of 1.6 M KCl. Calculate the concentrations of Pb2+ and Cl - at equilibrium. Ksp for PbCl2(s) is 1.6X 10-5.
*December 4, 2011*

**AP Chemistry **

Will a precipitate form when 100.0 mL of a 7.5 10-4 M Mg(NO3)2 is added to 100.0 mL of 5.8 10-4 M NaOH? (Hint: Ksp for Mg(OH)2 = 8.9 10-12) Give the value of Q, to support your answer.
*December 4, 2011*

**AP Chemistry**

The solubility of solid Ce(IO3)3 in a 0.20 M KIO3 solution is 4.4 10-8 mol/L. Calculate Ksp.
*December 4, 2011*

**AP Chem**

The Ksp for silver sulfate (Ag2SO4) is 1.2 10-5. Calculate the solubility of silver sulfate in each of the following. 0.30 M K2SO4
*December 4, 2011*

**Business**

What are the three elements of customer service, and how are they important to CRM?. * CRM is (customer relationship management)*
*December 3, 2011*

**physics**

What is the total force on the bottom of a swimming pool 20.5 m by 8.0 m whose uniform depth is 2.1 m?
*November 29, 2011*

**algebra**

if mary takes 3 hours to mow a lawn and sally takes 5 hours how long will it take them to mow it together
*November 14, 2011*

**Chemistry **

The combustion of 0.1583 g benzoic acid increases the temperature of a bomb calorimeter by 2.93°C. Calculate the heat capacity of this calorimeter. (The energy released by combustion of benzoic acid is 26.42 kJ/g.) A 0.1710 g sample of vanillin (C8H8O3) is then burned in ...
*November 13, 2011*

**Chemistry **

Consider the following reaction. CH4(g) + 2 O2(g) CO2(g) + 2 H2O(l) ÄH = -891 kJ Calculate the enthalpy change for each of the following cases. 1.00 103 L methane gas at 719 torr and 26°C is burned in excess oxygen.
*November 13, 2011*

**Chemistry **

Consider the dissolution of CaCl2. CaCl2(s) Ca2+(aq) + 2 Cl-(aq) ÄH = -81.5 kJ A 12.4 g sample of CaCl2 is dissolved in 100. g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and ...
*November 13, 2011*

**Chemistry**

A 5.00-g sample of aluminum pellets (specific heat capacity = 0.89 J/°C · g) and a 10.00-g sample of iron pellets (specific heat capacity = 0.45 J/°C · g) are heated to 100.0°C. The mixture of hot iron and aluminum is then dropped into 91.9 g of water...
*November 13, 2011*

**chemistry**

-4.1 KJ
*November 13, 2011*

**chemistry**

The enthalpy of neutralization for the reaction of a strong acid with a strong base is -56 kJ/mol of water produced. How much energy will be released when 185.0 mL of 0.400 M HCl is mixed with 152.5 mL of 0.500 M NaOH?
*November 13, 2011*

**physics**

If it requires 5.5 J of work to stretch a particular spring by 2.0 cm from its equilibrium length, how much more work will be required to stretch it an additional 4.1 cm?
*November 12, 2011*

**algebra**

Multiply , then simplify 5 sqrt:75 - 7 sqrt:3
*November 9, 2011*

**algebra**

solve (x+17)(x-6)(x+14)>0
*November 8, 2011*

**math**

In the bac of an old cupboard you discover a note signed by a pirate famous for his bizarre sense of humor and love of logical puzzles. In the note he wrote that he had hidden treasure somewhere on the property. He listed five true statements and challenged the reader to use ...
*November 4, 2011*

**Chemistry**

How much by mass of Urea (NH2)2CO is required for a 32.5% solution in one litre of water.
*October 24, 2011*

**Math/Economics**

Suppose that a firm has only one variable input, labor, and firm output is zero when labor is zero. When the firm hires 6 workers it produces 90 units of output. Fixed cost of production are $6 and the variable cost per unit of labor is $10. The marginal product of the seventh...
*October 18, 2011*

**Math/Economics**

Suppose that a firm has only one variable input, labor, and firm output is zero when labor is zero. When the firm hires 6 workers it produces 90 units of output. Fixed cost of production are $6 and the variable cost per unit of labor is $10. The marginal product of the seventh...
*October 18, 2011*

**Physics**

16.28
*October 17, 2011*

**math**

farmer fred had chickens and cows on his farm. he knows that together there are 108 legs and 30 heads. how many of each type of animal does he have?
*October 12, 2011*

**Principles of finance**

a bond has the following terms, Principal amount-$1000,Semi-annually $50, Maturity 10 Years, what is the bonds price if comparable debt yields 12%
*September 28, 2011*

**Physics**

A stone is dropped from a high altitude and 3 s later another stone is projected downward with a speed of 150 ft/s. When and where will the second stone overtake the first? Ans. (a) 5.70 s (b) 520 ft
*September 24, 2011*

**science**

A 0.25 kg length of aluminum wire is warmed 10.0 degrees by an electric current. How much heat was generated by the current?
*September 18, 2011*

**College CHEM**

Name for Sn(BrO3)
*September 12, 2011*

**physics**

A commuting student leaves home and drives to school at an average speed of 41.0 km/h. After 24.0 min she realizes that she has forgotten her homework and returns home to get it at the same average speed. It takes 9.0 min to find the report, after which the trip to school 41.0...
*August 29, 2011*

**English**

Revise the following sentences to remove all pronoun errors. 41. When a police officer fires his gun, he must fill out a lot of paperwork. 42. When a teacher writes an exam, they think about what aspects of student learning they want to test.
*July 28, 2011*

**Math**

The closing price for XYZ Company's common stock is uniformly distributed between $10 and $20 per share. What is the probability that the stock price will be greater than $17? What is the probability that the stock price will be between $12.50 and $16?
*July 24, 2011*

**american government**

no idea
*July 10, 2011*

**Physics**

except for in your equation for the velocity; use the radius of the circle there
*July 8, 2011*

**Physics**

Use the length of the string for "r".
*July 8, 2011*

**chemistry**

Well, My mom use to say "stupid is , stupid does".. I m getting there. Perhaps, this will help..say, you have O3, AsH3 , H2Se, how would you about explaining whether each of these acts like a Lewis acid, Lewis base or either.? Draing the lewis dot seems to imply that...
*July 4, 2011*

**chemistry**

Ok ..how do I know if they can or cannot accept an electron pair? Are these exception to the octet rule?Can you show sturture and explaination.
*July 4, 2011*

**chemistry**

can O3, AsH3 and H2Se act as a lewis acid? please explain.
*July 4, 2011*

**chemistry**

can O3, AsH3 and H2Se act as a lewis acid? please explain.
*July 4, 2011*

**geometry**

two smaller prisms have heights 2' and 10'. If the volume of the smaller prism is 32 cubic feet, find the volume of the larger prism.
*June 4, 2011*

**Math - Possible or Potential rational zeros**

UNDEFINED!
*June 1, 2011*

**Algebra**

2 years and 6 months
*June 1, 2011*

**Statistics**

0.246?
*May 24, 2011*

**math**

thank you so much.
*May 23, 2011*

**math**

i need help with just one question, and if i get it, ill be able to do the rest. Okay so its saying let height of a box be 4x+1, width be x-3, and length be 2x. Find the volume. So what do i do? how do i start solving this? its polynomials
*May 23, 2011*

**Statistics**

True or false? The following linear equation, y = b0 + b1x, is a regression line with y-intercept b0 and slope b1.
*May 19, 2011*

**Math Statistics**

True or false? The value of the correlation coefficient can be between 0 and 1.
*May 19, 2011*

**Statistics**

True or false? The linear correlation coefficient, r, is a numerical measure of the strength of the relationship between two variables representing quantitative data.
*May 19, 2011*

**geometry**

(4, 5)'(9, 5) and (5,1) are three of a quadrilateral whose opposite sides are equal and parallel.there are three possibilities for the co-ordinates of the missing vertex.Find all three,and draw the three quadrilateral on a grid
*May 19, 2011*

**math **

the square root of 54 2-0^2 = 4 7-0^2 = 49 1^2= 1 addd em up and take square root
*May 17, 2011*

**algebra**

93 90x6=540 82+87+95+90+93=447 540-447=93
*May 17, 2011*

**Math**

210
*May 17, 2011*

**Economics**

Budweiser (now owned by a Belgium based beer company), Miller and Coors who together produce 85% of all beer consumed in the US, each spend well over $250 million a year on television advertising campaigns, promoting their beer brands. Obviously, if one firm is advertising its...
*May 10, 2011*

**pLZ help**

Select a variable (mean or proportion) to determine if there is a difference in the two groups. Samples must be independent. Select a sample of data values (20 to 50) for each group. Then address the following (and a little more) in your project. a. Write a brief statement of ...
*April 30, 2011*

**Math **

Select a variable (mean or proportion) to determine if there is a difference in the two groups. Samples must be independent. Select a sample of data values (20 to 50) for each group. Then address the following (and a little more) in your project. a. Write a brief statement of ...
*April 30, 2011*

**statistics**

The highest acceptable level of pesticide found in quail has been limited to 0.35 parts per million (ppm). A hunting organization measured the level of the pesticide found in a random sample of 20 quail harvested from field trials. The sample produced a sample mean of .44. ...
*April 19, 2011*

**Phyiscs - due at 11PM EST!!**

Two identical conducting spheres, fixed in place, attract each other with a force of 0.114 N when their center to center separation is 45.00 cm. The spheres are then connected by a thin conducting wire. When the wire is removed, the spheres have a net positive charge and repel...
*April 12, 2011*

**English**

thank you
*April 12, 2011*

**english**

The town held a festival, because the harvest was so large.
*April 11, 2011*

**english**

I'm supposed to rewrite the entire sentence changing because the harvest had been so large to a nominative absolure.
*April 11, 2011*