Sunday

October 26, 2014

October 26, 2014

Total # Posts: 691

**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*

**calc**

Show that the equation x^3-15x+c=0 has at most one root in the interval [-2,2].
*February 28, 2011*

**Math**

How do you find the turning point of a quadratic equation? (The Formula)
*February 27, 2011*

**math**

make a let statement letx=white ribbons letx-3= blue ribbons letx+2=red ribbons x+x+2+x-3=32 solve
*February 27, 2011*

**HE AGE OF JEFFERSON TO THE AMERICAN EXPANSION**

During Jefferson's presidency, cities were A. mostly found along the Mississippi. B. mainly industrial centers. C. mainly ports for international trade. D. mostly the haunts of thieves and degenerates.
*February 26, 2011*

**CHEMISTRY**

How to determine the molarity of a 1.8% NaCl solution.
*February 24, 2011*

**math**

Among the royalty of the land of Pirnza are Velve, Brint, Draz, Flard, and Sorn.In no particular order, their titles are Queen, Marquis, duke baron, and duchess. Their ages are 25,30,35,40 And 45.From the clues given try to determine the age and Title of each of the five.
*February 24, 2011*

**science**

How to determine the molarity of a 1.8% NaCl solution.
*February 24, 2011*

**physics**

An Atwood machine consists of two masses (m1 = 175 grams, m2 = 485 grams) connected by a string over a frictionless pulley. The initial height above the floor is 157 cm. Both masses start from rest at point A ; point B is just as m2 hits the floor. What is the kinetic energy ...
*February 23, 2011*

**math**

A single die is rolled once. What are the odds against rolling a prime number?
*February 18, 2011*

**science**

Why are the Catskills not really mountains? a the catskills are lowlands b all mountains must be volcanic in origin c the horizontal rock structure shows no deformation d the catskills are a direct deposit of the last pleistocene glaicer
*February 16, 2011*

**college algebra**

add 1 + 9 x+7 5x
*February 14, 2011*

**physics! (69)**

0.395
*February 7, 2011*

**Chemistry**

Raising the temperature of a sample of water will typically(decrease/increase) the solubility of (all/some) dissolved gases. Is it decrease, some?
*January 29, 2011*

**lit**

i need chapter summaries of the book The Quiet American by graham greene
*January 27, 2011*

**alg.2**

-2x+-6y=0 2x+6y=5 =5
*January 19, 2011*

**Maths **

285 liters of air.
*January 19, 2011*

**Physics**

A 1200 kg elevator is attatched to a cable whose tension is 11700 n. What is the magnitude of the elevator's acceleration? What is the Motion of the elevator? could have multiple answers.
*January 19, 2011*

**Math**

how did u wrk dat ou?
*January 18, 2011*

**chemistry help**

a 4.50 sample of LiCl at 25.0*C dissolves in 25.0 mL of water also at 25.0*C. The final equilibrium temperature of resulting solution is 60.8*C. What is the enthalpy of solution, of LiCL expressed in kilojoules per mole?
*January 18, 2011*

**chemistry help **

a 4.50 sample of LiCl at 25.0*C dissolves in 25.0 mL of water also at 25.0*C. The final equilibrium temperature of resulting solution is 60.8*C. What is the enthalpy of solution, of LiCL expressed in kilojoules per mole?
*January 18, 2011*

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