Saturday

July 4, 2015

July 4, 2015

Total # Posts: 2,637

**Chemistry**

Consider the following two thermochemical equations N2+2.5O2-> N2O5(s) Delta H=xkJ N2+2.5O2-> N2O5(g) Delta H=ykJ The enthalpy change in kJ for the sublimation of one mole of N205 solid to gas would be represented by the quantity a)x+y b)x-y c)y-x d)-x-y Assuming it'...
*July 24, 2010*

**Chemistry**

Can you explain why you have to subtract the other way?
*July 24, 2010*

**Chemistry**

I thought what your suppose to do is -1275 - ((-875) + (-283))= -117kj/mols Don't u just subtract? To find the difference?
*July 24, 2010*

**Chemistry**

The molar enthalpies of combustion of CH3COCOOH(l)CH3COOH(l) and CO(g) are respectively -1275kJ/mol, -875kJ/mol, and -283kJ/mol. What is the enthalpy change for the reaction below? CH3COCOOH= CH3COOH +CO a)1867kJ b)-1867kJ c)117kJ d)-117kJ e)-2433kJ I think it's d)
*July 24, 2010*

**Chemistry**

The pressure of a gas is 35 atm at a temperature of 48 (degrees) C with constant volume. What will the new pressure be if the temperature is increased to 36 (degrees) C?
*July 23, 2010*

**Finance**

if you bought 12,000 shares of stock at .50 per share and the stock falls to .25 per share how many additional shares would you have to buy to get your bottom line down to .25
*July 21, 2010*

**algebra**

Invest $5,000 in a savings account at 6.6% interest compounded monthly
*July 20, 2010*

**math**

weighted coin has property that heads comes up 60 percent of time. two flips of coin is it more likely that outcome from two flips are the same or outcome from two flips are different?
*July 14, 2010*

**geometry**

How many hours will it take a bicyclist traveling 17.6 feet per second to finish a 90-mile race? Round your answer, if necessary, to the nearest tenth.
*July 13, 2010*

**geometry**

Why don't parallel lines exist in elliptical geometry?
*July 13, 2010*

**GEOMETRY**

A __________ __________ touches every vertex exactly once, but does not return to its origin. ________________________________________ A. Hamiltonian circuit B. Hamiltonian path C. Euler circuit D. Euler path
*July 13, 2010*

**GEOMETRY**

Which of the following are measurements of the sides of a right triangle? ________________________________________ A. 3, 4, 5 B. 28, 26, 12 C. 17, 14, 6 D. all of the above
*July 13, 2010*

**geometry**

Which of the following are measurements of the sides of a right triangle? ________________________________________ A. 3, 4, 5 B. 28, 26, 12 C. 17, 14, 6 D. all of the above
*July 13, 2010*

**geometry**

The width of a rectangle is 6 feet, and the diagonal is 10 feet. What is the area of the rectangle?
*July 13, 2010*

**chem 121**

^good hints
*July 9, 2010*

**Geometry**

Which of the following is NOT a way you can show that triangles are similar? ________________________________________ A. AAA similarity B. SAS similarity C. SSA similarity D. SSS similarity
*July 8, 2010*

**Geometry**

If an object is reflected twice over parallel lines, and corresponding points of the original and final translation image are 30 centimeters apart, how far apart are the parallel lines?
*July 8, 2010*

**science**

Ear defenderes reduce the amount of noise (sound power) that gets to your ears by producing a physical barrier that absorbs the noise and muffles it.
*July 8, 2010*

**Geometry**

nvr mind i found it its c
*July 8, 2010*

**Geometry**

Congruent triangles have a relation. Which is not an equivalence relation? ________________________________________ A reflexive B symmetric C distributive D transitive
*July 8, 2010*

**algebra**

solve by subsitution 6x + 5y = 27 x = 17 -8y my answer was (3,-7)
*July 8, 2010*

**Geometry**

Points (5, 3) and (6, 2) lie on line k. Which is the slope of the line that is parallel to k?
*July 7, 2010*

**algebra**

find the slope (4,-4)
*July 7, 2010*

**Geometry**

The side of a square measures 3 cm. What is its area?
*July 1, 2010*

**Physics**

I have a formula for inertia torque T(inertia) = .09 x Wk^2(inertia)/S(stops) x t(move)^2 This is a shaft that indexes 36 degrees at a time so that how we determine 10 stops for S. I do not know where the factor .09 comes from. Can you explain
*June 25, 2010*

**Physics**

I have a formula for inertia torque T(inertia) = .09 x Wk^2(inertia)/S(stops) x t(move)^2 This is a shaft that indexes 36 degrees at a time so that how we determine 10 stops for S. I do not know where the factor .09 comes from. Can you explain
*June 25, 2010*

**geometry**

ur mom
*June 16, 2010*

**Statistics**

there are 120 possible sample of size n=3 which can be drawn from this population of 10 score: 3,4,5,6,7,8,9,10,11,12
*June 16, 2010*

**TI-83 CALC PROGRAM**

F you
*June 14, 2010*

**geometry**

a bug lives on a corner of a cube and is allowed to travel only on the edge of the cube. in how many ways can bug visit each other of the other seven corners once and only once, returning to its home corner only at the end of the trips?
*June 13, 2010*

**geometry**

a bug lives on a corner of a cube and is allowed to travel only on the edge of the cube. in how many ways can bug visit each other of the other seven corners once and only once, returning to its home corner only at the end of the trips?
*June 13, 2010*

**Math**

A television manufacturer makes console and wide-screen televisions. The profit per unit is $125 for the console televisions and $200 for the wide-screen televisions. Write the objective function that describes the total monthly profit. Write a system of three inequalities ...
*June 12, 2010*

**Math**

Objective Function z = 3x - 2y Constraints x > or equal to 1 x < or equal to 5 y > or equal to 2 x - y > or equal to -2
*June 12, 2010*

**Math**

Using 3.14 for pi, rounding to the nearest tenth, if necessary. A spherical storage tank has a diameter of 48 ft and is full of water. How many delivery trucks with cylindrical tanks measuring 8 ft in diameter and 10 ft long can be completly filled from the storage tank?
*June 12, 2010*

**chemistry**

Calculate the hydroxide ion conc. and the % ionization @20oC in a 1.25 M NH3 solution. The Kb for NH3 = 1.70x10-5 @20oC.
*June 10, 2010*

**Trigonometry**

Okay that makes sense. I knew i was overlooking something. Thanks for the help Reiny! it really helped me out
*June 9, 2010*

**Trigonometry**

sin (4x) = .5 what are the 4 solutions? How did you get them?
*June 9, 2010*

**Geometry**

perimeter=8+5+8+5=26m area=8*5=40m
*June 9, 2010*

**algebra**

a (-1/6, 1) it goes 1 to the left and 10 up. the midpoint of 1 is 1/2 and of 10 is 5. it goes 1/2 to the left of the x value in the first point and 5 up from the y value. (1/3-1/2, -4+5)=(-1/6, 1)
*June 9, 2010*

**Trigonometry**

for the example you gave i can get 37.5 deg and 7.5deg. what are the other solutions?
*June 9, 2010*

**Trigonometry**

Thanks Reiny. If a question similar to this one had 4 solutions, how would you know that it had 4 answers?
*June 9, 2010*

**Trigonometry**

3csc(2X)-5=0 What are the solutions for X and how did you find them out?
*June 9, 2010*

**Macroeconomic**

1. An example of an automatic stabilizer is A. a temporary tax rebate. B. the progressive income tax.Student Response C. cost of living adjustments to social security payments. 2. Which of the following represent expansionary fiscal policy? A. an increase in average individual...
*June 8, 2010*

**Macroeconomic**

The idea that creating incentives for individuals and firms to increase productivity leading to an increase in the long-run aggregate supply curve is a. the Ricardian equivalence theorem. b. demand-side economics. c. consistent with crowding out. d. supply-side economics.
*June 8, 2010*

**physics**

A 5 m long see saw has a child whose mass is 25 kg sitting on one end. How far in meters from the center should a 70 kg adult sit on the opposite side for the see saw to balance?
*June 8, 2010*

**Math**

Graph linear inequality y<-2x + 4 y<x-4
*June 6, 2010*

**Economic**

1) GDP does not include intermediate goods because a. that would understate the true size of GDP. b. intermediate goods are not useful to consumers. c. that would count the value of intermediate goods twice. d. intermediate goods are not valuable. 2) The dollar value of an ...
*June 6, 2010*

**electric fields *easy**

mecotes
*June 5, 2010*

**Science-8th**

how would i do C5H12 + O2 CO + H2O
*June 5, 2010*

**Math**

3x + 4y less than or equal to -12 Graph linear inequality
*June 5, 2010*

**algebra**

Find the x-intercept: f(x)=3x^2-5x-11
*June 2, 2010*

**math**

What si the volume and surface area of a triangular prism with the dimensions of a 2.5 base, 2.5 height, and 7 length
*June 2, 2010*

**physics **

A constant net force of 1500 N gives a toy rocket an acceleration of 2.5 m/s2. what is the mass in kg?
*June 2, 2010*

**physical science **

A constant net force of 1500 N gives a toy rocket an acceleration of 2.5 m/s2
*June 2, 2010*

**chemistry**

Why is it important for a company manufacturing vinegar to regularly check the molarity of its product?
*June 1, 2010*

**college statistics**

Three members of a club will be selected to serve as officers. The first person selected will be president, the second person will be vice-president and the third will be secretary/treasurer. How many ways can these officers be selected if there are 30 club members?
*May 30, 2010*

**6th grade writting**

how many paragraphs is an essay?
*May 29, 2010*

**chem**

1 molar solution of Pb(NO3)2 you want 3mL of 0.5 Molar Pb(NO3)2 how much of the one molar solution do you mix with H2O to reach your goal
*May 27, 2010*

**Statistics - Urgent**

If there were two groups: One group who saw a yardstick before estimating its length Another group who did not see a yardstick before estimating its length Would this be a matched pairs design (a person from both groups estimates at the same time, then the next pair, etc.)? Or...
*May 26, 2010*

**Statistics - Data Collection**

Specifically for a two sample t test on difference in means with a matched-pairs design. What would the step-by-step process be for a simple random sample from the cafeteria population?
*May 26, 2010*

**Statistics - Data Collection**

If you were in a cafeteria full of students and you wanted to randomly divide 10 students into group A and 10 students into group B, what would be the least biased way to do it?
*May 26, 2010*

**science**

How can an animals structure help survive in different environments? give three examples
*May 25, 2010*

**statistics**

To reduce theft, the Meredeth Company screens all its employees with a lie detector test that is known to be correct 90 percent of the time (for both guilty and innocent subjects). George Meredeth decides to fire all employees who fail the test. Suppose 5 percent of the ...
*May 23, 2010*

**math**

No One was Not taking any of these,Because 33+13=46
*May 21, 2010*

**posting box**

That might be from loading and You may just not have the settings it needs
*May 20, 2010*

**social studies **

Republicans
*May 19, 2010*

**all subjects**

Yes I love it!!It gives me a bunch of help and it is VERY fun I spend HOURS o this.And Ms.Sue Is ALOT of help,She has Complete Answers And Gives you Websites if she has a good 1!Thanks A BUNCH Jiskha I LOVE this!
*May 19, 2010*

**True False**

False It should be "Many students anticipate spring break,But Luise looks forward to Winter vacation more."
*May 19, 2010*

**QUICK! BE THE FOURTH PERSON TO CLICK TO WIN BIG $!**

This was a HUGE waste of time
*May 18, 2010*

**Africa**

Gorillas are from there!!!! :)
*May 16, 2010*

**english**

OF COURSE!!!!!!
*May 16, 2010*

**math**

how many ways can 9 cars be parked in a row of 9 parking spaces?
*May 16, 2010*

**chemistry**

thank you very much DrBob!!I really appreciate this
*May 15, 2010*

**chemistry**

how many grams of oxygen is required to produce 2.0 kg of water??
*May 15, 2010*

**science /chem**

yup that's right
*May 12, 2010*

**algebra**

What should you say if you see a tall wrought-iron tower in paris, france?
*May 12, 2010*

**5th grade**

I am A 5th grader To.Blameless,Exculpated,and Simply Not Guilty.
*May 12, 2010*

**Data Management**

Oh also n is the total number of tickets which in this case is 1000000
*May 10, 2010*

**Data Management**

P(x) of 1000000 is 1/1000000 P(x) of 50000 prize is 2/1000000 P(x) of 1000 prize ia 10/1000000 P(x) of 50 prize is 200/1000000 P(x)=p Find E(x) for each one E(x)= n.p Then add all E(x) values to find the expected value of all prizes for one ticket Finally, that that total and ...
*May 10, 2010*

**english**

true but dount
*May 10, 2010*

**Social Studies**

What large city is northeast of New York City?
*May 7, 2010*

**math**

12
*May 6, 2010*

**chemistry**

A solution is prepared by mixing 0.0433 mol CH2Cl2 and 0.0623 mol CH2Br2 at 25°C. Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25°C. At 25°C, the vapor pressures of pure CH2Cl2 and pure CH2Br2 are 133 and 11...
*May 4, 2010*

**chemistry**

Glycerin (C3H8O3) is a nonvolatile liquid. What is the vapor pressure of a solution made by adding 180. g of glycerin to 321 mL of H2O at 39.8°C? The vapor pressure of pure water at 39.8°C is 54.74 torr and its density is 0.992 g/cm3.
*May 4, 2010*

**chemistry**

Calculate the molarity and mole fraction of a 2.35 m solution of acetone (CH3COCH3) dissolved in ethanol (C2H5OH). (Density of acetone = 0.788 g/cm3; density of ethanol = 0.789 g/cm3.) Assume that the final volume equals the sum of the volumes of acetone and ethanol.
*May 4, 2010*

**chemistry**

Calculate the sodium ion concentration when 55.0 mL of 4.5 M sodium carbonate is added to 15.0 mL of 3.0 M sodium bicarbonate.
*May 4, 2010*

**earth and space science**

i like pie
*April 29, 2010*

**chemistry**

What must be the pH of a solution that is 0.067 M Fe3+ to just cause Fe(OH)3(s) to precipitate?
*April 28, 2010*

**math**

prove the following: given: ABCD is a trapezoid with bases BC and AD to prove: BX • AX = DX • CX X is the intersection of the segment going from BD and AC i need the answer in a two column proof statements Reasons 1. ABCD is a trapezoid with 1. given bases BC and AD ...
*April 28, 2010*

**physics**

In the figure below, a box of Cheerios (mass mC = 0.8 kg) and a box of Wheaties (mass mW = 2.5 kg) are accelerated across a horizontal surface by a horizontal force applied to the Cheerios box. The magnitude of the frictional force on the Cheerios box is 2.0 N, and the ...
*April 26, 2010*

**ACCOUNTING**

if a company issued $32,000,000 of 10-year, 12% bonds at an effective interest rate of 13%, receiving cash of $30,237,139 and interest on the bonds is paid semiannually how do you calculate the first semiannual interest payment and the amortization of the bond discount?
*April 26, 2010*

**math**

38 animals
*April 22, 2010*

**physics**

It emits a sound, so the equation is Intensity = Power / 4(pi)r^2 r being the distance, 158 meters.
*April 21, 2010*

**AP Chemistry **

I decided to set up an ICE chart but I am a little confused. This is what I did: CaCl2 + K2SO4 = CaSO4 + 2 KCl I 0.020M 0.20M 0 0 C -X -X +X +2X E 0.020-x 0.20-x 0+x 0+2x Am I right in saying this? Additional information: Ksp= (CaSO4)(KCl)^2 / (CaCl2)(K2SO4) Ksp= 2.4 x 10^ -5
*April 21, 2010*

**AP Chemistry **

100. mL of 0.020 M CaCl2(aq) is added to 200. mL of 0.20 M K2SO4(aq). Calculate the equilibrium concentrations of Ca^2+ (aq) and SO4^2-(aq)
*April 21, 2010*

**Finance**

Suppose you are considering two investments, stock A and stock B. The beta of A is 1.20, and the beta of B is 0.80. Stock A has an expected return of 12% and Treasury Bills are yielding 3%. If the two stocks are fairly prices, what's the expected return on the Market Index...
*April 20, 2010*

**College Chemistry**

If you have the molecular weight of ethanol which is 46.1 and the concentration is 4.0% w/v. What is the molarity
*April 20, 2010*

**physics**

Frank stands at the base of a building. He throws a 0.12kg rock straight up at a speed of 28m/s so that it rises to a maximum height of 12m above the top of the building and then falls straight down on the roof of the building. a) What is the height of the building? b) What is...
*April 18, 2010*

**physics**

A helicopter hovering above a forest fire dumps a large bucket of water. How far does the water fall during the third season?
*April 18, 2010*

**physics**

Does a free falling object have a velocity of zero? If it does then is it zero for the initial velocity or the final velocity?
*April 18, 2010*