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December 21, 2014

Posts by Bill


Total # Posts: 712

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

gov.
ep
November 15, 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

english
so what do i need to do, I don't understand it at all.
April 11, 2011

english
need help with this Nominative Absolutes sentence "The town held a festival because the harvest had been so large.". is this right? The town held a festival the harvest been so large.
April 11, 2011

Physics
At a recent rock concert, a dB meter registered 118 dB when placed 1.60 m in front of a loudspeaker on the stage. (a) What was the power output of the speaker, assuming a hemispherical radiation of the sound and neglecting absorption in the air? Answer in W (b) How far away ...
April 1, 2011

Social Sciences
I need to write an essay using the second amendment controversy with gun control as proof that the Bill of Rights is at an unhealthy state. I am going to focus on misleading ideologies surrounding guns and gun control and propose that proper gun education and knowledge is a ...
March 26, 2011

us history
after containment what would be considered the us foreign policy
March 23, 2011

MATH
yes 9 sundaes
March 23, 2011

Math
pie r squared times v
March 23, 2011

PreCalculus
"A kite is flying 100ft off the ground, and its line is pulled taut. The angle of elevation of the kite is 43 degrees. Find the length of the line."
March 23, 2011

physics
if the initial velocity is .05 m/s and its final is 1.3 m/s then how much energy is lost to friction
March 23, 2011

history
the economic system advocated by margaret thatcher was?
March 21, 2011

Physics
An equilateral triangle 100.0 m on a side has a m1 = 15.00 kg mass at one corner, a m2 = 75.00 kg mass at another corner, and a m3 = 120.00 kg mass at the third corner. Find the magnitude and direction of the net force acting on the 15.00 kg mass.
March 17, 2011

chemessty
What is the freezing point of an aqueous solution of 10.0 g of glucose (C6H12O6) in 50.0g H2O? (kf=-1.86 C/m)
March 16, 2011

Physics
A dock worker loading crates on a ship finds that a 24 kg crate, initially at rest on a horizontal surface, requires a 64 N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 46 N is required to keep it moving with a constant ...
March 15, 2011

Chemistry
55g of CF2Cl2, how many grams of Cl do I have? How do I solve this kind of problem?
March 12, 2011

Physics
The coil used to measure the movements of a blowfly as described having a diameter of 2 mm, in addition the blowfly is immersed in a magnetic field of magnitude .15 mT. Find the maximum magnetic flux of one of the coils?
March 10, 2011

Statistics
Recently, a case of food poisoning was traced to a particular restaurant chain. The source was identified and corrective actions were taken to make sure that the food poisoning would not reoccur. Despite the response from the restaurant chain, many consumers refused to visit ...
March 9, 2011

prealgebra
In the equation A=ur^2, if r is doubled, by what number is A multiplied and why? a. 2 b. 1\2 c. 4 d. 1\4
March 9, 2011

PreAlgebra
If x=yz, which of the following must be equal to xy? a. yz b. yz^2 c. y^2z d. z^2\y
March 9, 2011

MATH
probability approx number of times event occurs\total number of trials. 3 shots divided by 10 free throws = .3 is the probability of making next free throw.
March 9, 2011

physics
a glider of length 10.00 cm slides down an air track. It passes through the lower photogate in .50 sec. A little later it passes through the lower photogate 100.00 cm down the track, in .25 sec. Calculate initial velocity,final velocity, and acceleration. Any help is greatly ...
March 9, 2011

chemistry
What mass of sodium iodide (NaI) is contained in 135 mL of a 7.0% (m/v) soulution?
March 7, 2011

science
You add 12.5 mL of 4.15 acetic acid to 25.0 mL of 1.00 M NaOH. Calculate the hydronium ion concentration and pH of the resulting solution.
March 7, 2011

Algebra II
you may want another opinion but since your answer must be not equal to zero and also cannot be negative you have to look at the (x-7) portion. you cannot just say all real numbers are greater than zero, because if you plug 7 into the problem, then (7-7) = 0 and will make the ...
March 7, 2011

Algebra/geometry
a rectangle has a width of 4 cm less than it's length. if a new rectangle is formed by increasing the width 5 cm and decreasing the length 3 cm, the area of this resulting rectangle is 177 cm squared. what are the dimensions of the original rectangle?
March 6, 2011

MATH
first you need to find 85% of 40 questions. turn 85% into the decimal .85... you do that by dividing 85 by 100. the formula is x=.85(40) and that gives you x=34. so now you know that Wendy had 34 out of 40 questions right, so now to find out how many she had wrong you subtract...
March 6, 2011

Algebra 1
First you have to recognize the terms you can combine, in this case a negative 4T and a negative 3T, which gives you a negative 7T. so now your problem looks like 6T^2 - 7T + 2. to factor it out you have to do a kind of reverse foil, see what term multiplied by what other term...
March 6, 2011

Physics Concepts
A father racing his son has one-third the kinetic energy of the son, who has two-fifths the mass of the father. The father speeds up by 1.5 m/s and then has the same kinetic energy as the son. What is the Father's initial speed? What is the Son's initial speed?
March 5, 2011

math
how much force does 1000lbs have when drop from 36"
March 5, 2011

math
A rectangular painting has an area of 720 square inches. It is to be reduced by 1/6 scale factor. What is area of the miniature copy.
March 4, 2011

physics
There is a weight on a table, connected by a cord to another weight hanging over a pulley, as shown in the diagram below. The coefficient of kinetic friction for the weight on the table is 0:25. How fast does the hanging weight accelerate? Top weight is 12 kg and bottom is 5kg.
March 3, 2011

physics
sorry no the one on top is 12 and the hanging one is 5 in kg's
March 3, 2011

physics
There is a weight on a table, connected by a cord to another weight hanging over a pulley, as shown in the diagram below. The coefficient of kinetic friction for the weight on the table is 0:25. How fast does the hanging weight accelerate?
March 3, 2011

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