Saturday

April 18, 2015

April 18, 2015

Total # Posts: 248

**chemistry**

ΔG= (2x53 + -114) - (2x162)= -332 K=e^(-332/(.008314x298)= 6.36 e-59 I have also tried using 8.314 as the value for R
*March 15, 2015*

**chemistry **

The power of the equation ΔG° = –RT ln(K) is that K can be determined from tabulated values of ΔG°f. Use the tabulated values of the Gibb's energy to determine K for the reaction, 2AB(l) ↔ 2A(g) + B2(g), at 298K. (R=8.314 J/K mol or R=0.008314 ...
*March 15, 2015*

**Chemistry **

A pH = 7.6 buffer is needed in the lab. This buffer is made by first dissolving 17.42 g K2HPO4 in 600 mL of water. What is the pH of this salt solution? This solution of course will be too basic becuase we only have the base of the buffer present. What must the value of the ...
*March 12, 2015*

**Chemistry **

Calculate the pH of the the solution that results from titrating 50 mL of 0.6 M NaOCl(aq) with 0.3 M HBr At 0.00 mL of HBr: At 70 mL of HBr: At 100 mL HBr: At 120 mL of HBr
*March 12, 2015*

**Chemistry **

Calculate the pH of the the solution that results from titrating 50 mL of 0.6 M HCN(aq) with 0.2 M NaOH At 0.00 mL of NaOH At 85 mL of NaOH. At 150 mL NaOH. At 160 mL of NaOH
*March 12, 2015*

**Chemistry **

What is the pH of a 150 mL buffer solution containing 0.5 M NaH2PO4 with 0.5 M K2HPO4? Determine the new pH of the solution upon the addition of 10 mL of 1.2 M strong acid to the 150 mL buffer solution above.
*March 12, 2015*

**Chemistry **

what is the pH of a solution created by adding 15.5 g of KClO to 228 mL of 1.08 M HClO(aq).?
*March 12, 2015*

**Algebra**

Factor: -3x^2 - 18x + 15
*February 15, 2015*

**SPANISH**

Thank you so much :)
*February 3, 2015*

**SPANISH**

Thankyou
*February 3, 2015*

**SPANISH**

This question tells us to answer if the children bahaved good or bad from the paragraph below. Todos los niños le regalaron a Ana muchas cosas fantásticas. Había muñecas, juguetes, animales de peluche … y más cosas. Susana le regal&...
*February 3, 2015*

**Analytic Geometry**

Find the bisectors of the interior angles of the triangle whose sides are the line 7x+y-7=0, x+y+1=0 and x+7y-4=0.
*December 14, 2014*

**Middle School Math**

My home work problem is 3g+5=17 my answer is -20. A I correct.
*December 11, 2014*

**math**

a variable y varies directly as the square root of a varies x,and equals 6 when x=4 find y when x=25
*November 20, 2014*

**Physics**

A glass block has a refractive index of 1.49. What is the critical angle for the block?
*November 18, 2014*

**Precalculus (Telescoping Series)**

Evaluate 3/(1! +2! +3!) + 4/(2! +3! +4!) + 5/(3! +4! +5!) + ... + 2001/(1991! +2000! +2001!).
*November 15, 2014*

**Physics**

Two objects are moving in the xy-plane. No external forces are acting on the objects. Object A has a mass of 3.2 kg and has a velocity of Va= (2.3 m/s)i + (4.2m/s)j and object B has a mass of 2.9 kg and has a velocity of Vb= (-1.8m/s)i + (2.7m/s)j. Some time later, object A is...
*November 9, 2014*

**Physics**

Two objects are moving in the xy-plane. Object A has a mass of 3.2 kg and has a velocity of Va= (2.3 m/s)i + (4.2m/s)j and object B has a mass of 2.9 kg and has a velocity of Vb= (-1.8m/s)i + (2.7m/s)j. What is the total momentum of the system? (should I use dot product here?)
*November 9, 2014*

**math**

the width of a rectangle is 4cm and the length is 8 cm if both the width and the length are increased by equal measures, the area of the rectangle is increased by 64 cm 2. find the length and width of the larger rectangle
*October 26, 2014*

**College Algebra**

Solve for x in terms of the other symbols: rsx^2 + s^2 x + rtx + st = 0
*October 11, 2014*

**Geometry**

A swimming pool is to be constructed in the space of partially overlapping identical circles. Each of the circles has a radius of 9 m, and each passes through the center of the other. Find the area of the swimming pool.
*September 28, 2014*

**Math **

A cube has a surface area of 24 ft2. What is the length of one edge of the cube? Show Work Please.
*June 1, 2014*

**English II B**

Ok thanks.
*April 3, 2014*

**English II B**

It don't say, but are you saying it's 4.
*April 3, 2014*

**English II B**

I think its either 2 or 1.
*April 3, 2014*

**English II B**

A student has completed a freewriting exercise. The result is a paragraph exploring the general theme of war in a literary text. What is the next step in the writing process? 1.gathering details 2.beginning an outline 3.writing an introduction 4.narrowing the topic Need help ...
*April 3, 2014*

**English II B**

Thanks, but me and mike are brothers we are working on the same paper.
*April 3, 2014*

**English II B**

What is the term for a magazine that is published on the computer? 1. computerized slide show 2. online publication 3. electronic portfolio 4. electronic bulletin board
*April 3, 2014*

**English II B**

Need Help Please. A student is thinking about different forums for publishing an editorial. Which of the following would be appropriate? 1.a dramatic reading 2.an anthology 3.a poetry contest 4.a school newspaper
*April 3, 2014*

**math algebra**

a square parking lot has a surface area of (w^4-2w^2x+x^2) square feet. Factor this trinomial to find the length of one side in feet.
*March 19, 2014*

**CALCULUS ECONOMICS**

How did you get to that number?I have 5000 (wrong solution) and I can't figure out q7 because i don't know the right value for q.opt (q.eq=625?)
*March 13, 2014*

**Math **

Jared's football team lost a total of 12 yards during 4 plays of the game. They lost the same number of yards during each of the plays. What is an integer that can represent the number of yards lost during each play?
*March 11, 2014*

**Physics**

A 2050 kg truck is traveling east through an intersection at 2.3 m/s when it is hit simultaneously from the side and the rear. (Some people have all the luck!) One car is a 1200 kg compact traveling north at 4.5 m/s. The other is a 1600 kg midsize traveling east at 10 m/s. The...
*March 9, 2014*

**Chemistry**

120.0g of ice is melted, how much energy is absorbed?
*February 21, 2014*

**programming logic**

The No Interest Credit Company provides zero-interest loans to customers. (It makes a profi t by selling advertising space in its monthly statements and selling its customer lists.) Design an application that gets customer account data that includes an account number, customer...
*December 5, 2013*

**physics-can anyone solve this please**

3. A positive helium ion He+ is released from rest at the surface of a +1000 V flat electrode. It travels in the +x-direction (in vacuum) across a 1 mm gap, passes through a small hole in a +0 V electrode that is parallel to the first one, and enters a region of magnetic field...
*November 23, 2013*

**magnetism help**

A positive helium ion He+ is released from rest at the surface of a +1000 V flat electrode. It travels in the +x-direction (in vacuum) across a 1 mm gap, passes through a small hole in a +0 V electrode that is parallel to the first one, and enters a region of magnetic field. ...
*November 22, 2013*

**Physics electric potential energy difference**

A current loop with radius 20 cm and current 2 A is in a uniform magnetic field of 0.5 T. Considering all possible orientations of the loop relative to the field, what is the largest potential energy difference (in Joules) you can find between two orientations?
*November 22, 2013*

**Physics**

Three moles of an ideal monatomic gas are at a temperature of 396 K. Then 2438 J of heat is added to the gas, and 897 J of work is done on it. What is the final temperature of the gas?
*November 19, 2013*

**Phyics**

Three moles of an ideal monatomic gas are at a temperature of 396 K. Then 2438 J of heat is added to the gas, and 897 J of work is done on it. What is the final temperature of the gas?
*November 19, 2013*

**Physics**

A container holds 1.3 mol of gas. The total average kinetic energy of the gas molecules in the container is equal to the kinetic energy of a 6.6x10-3 kg bullet with a speed of 670 m/s. What is the Kelvin temperature of the gas?
*November 19, 2013*

**math**

2(w+18+W)=2(w+18−6+w+3) perimeter is 126 my teacher ask to get the value of W
*November 11, 2013*

**math**

2(w+18+W)=2(w+18−6+w+3) perimeter is 126 whats w = to?
*November 11, 2013*

**algebra**

2(w+18+W)=2(w+18−6+w+3)
*November 11, 2013*

**ENGLISH**

Book april morning Describe both sides of the Boiled pudding controversy in town. What does this reveal about the town?
*October 24, 2013*

**engineering**

What is the change in enthalpy for an isothermal, isentropic compression of an ideal gas from 2 atm to 12 atm?
*October 23, 2013*

**chemistry**

What is the change in enthalpy for an isothermal, isentropic compression of an ideal gas from 2 atm to 12 atm?
*October 23, 2013*

**History**

How did American debates about foreign policy in the 1790s reflect the beliefs of the political parties? i think it tells poltical parties what to change ,but i need more info.
*October 22, 2013*

**Us history **

Define unicameral legislature and bicameral legislature. Which type of legislature did must states have? I cant find what type of legislature did the states have
*October 13, 2013*

**us history **

why did madison believe that faction would not be good
*October 9, 2013*

**math**

in triangle ABC, AB=6, BC=12 AND AC=X. Which of the following cannot be a value of x? a. 6 b.7 c.8 d.9 e.10
*September 21, 2013*

**math**

The average of 20,70 and x is 40. If the average of 20,70, x and y is 50, then y= a. 30 b. 60 c. 70 d. 80 e. 100
*September 21, 2013*

**us history **

Should the United States take action in Syria, why or why not? I believe that the us shouldnt because the us
*September 9, 2013*

**math**

1.4
*June 23, 2013*

**Statistics**

Suppose that A and B are events defined on a common sample space and that the following probabilities are known. Find P(A or B). (Give your answer correct to two decimal places.) P(A) = 0.34, P(B) = 0.41, P(A | B) = 0.2
*June 8, 2013*

**Math**

If you can write 5 pages each hour, at that rate, how many min. would it take you to write 2?
*May 13, 2013*

**Calculus (math)**

A) 12,000 ft lb B) 9,600 ft lb C) 2,690 ft lb D) 14,500 ft lb
*April 26, 2013*

**Calculus (math)**

A rescue cable attached to a helicopter weighs 2 lb/ft. A 190 lb man grabs the end of the rope and is pulled from the ocean into the helicopter. How much work is done by lifting the man if the helicopter is 50 ft above to water.
*April 26, 2013*

**Statistics**

how can I decide to reject or fail to reject the following null hypothesis? let a= 0.05,data; p=0.69, n=32, test statistic z= 0.09095 H(0);p=0.68 H(1)p>0.68
*April 19, 2013*

**Statistics**

how can I determine weather to reject or fail to reject the following nul hypothosis: let a= o.01, data: s= 3.1, n=55 and H(0) st dev 2.8 and H(1)< 2.8
*April 19, 2013*

**Calc**

Find the present value of $14000 due in 9 years at the given rate of interest. (a) 2%/year compounded semiannually? (b) 5%/year compounded semiannually?
*April 5, 2013*

**chemistry**

Calculate the increase of entropy in J/K when 8.6 mole of C 2 H 5 OH melts at (-114) o C and 1 atm. ΔH fus = 5.02 kJ/mol
*March 31, 2013*

**College Statistics**

probilbility summary low birth weight and smoking moms how to calculate prevanece eatios
*March 30, 2013*

**Organic Chemistry**

please homework help A bowl of 582 g of water is placed in a microwave oven that puts out 729 watts (J/s). How long would it take in seconds to increase the temperature of the water from 12.0oC to 46.6oC?
*March 25, 2013*

**Gen. Chem**

Could you help me with this homework please.. 105.0 g of water is in a Styrofoam calorimeter of negligible heat capacity. The initial T of the water is 17.1oC. After 288.2 g of an unknown compound at 77.0oC is added, the equilibrium T is 25.1oC. What is the specific heat of ...
*March 25, 2013*

**Math**

Make a tree diagram of all the possible arrangements of the word veer
*March 17, 2013*

**njit**

i did it but i can't find the right answer i tried several times but i cant get the result please help me out
*March 15, 2013*

**njit**

please life saver i am taking a quiz now can some one help me with this pleeeeeeeaaaaaaaaassssssseeee Calculate the pH of 0.175 M phosphoric acid (H3PO4, a triprotic acid). Ka1 = 7.5 x 10-3, Ka2 = 6.2 x 10-8, and Ka3 = 4.8 x 10-13.
*March 15, 2013*

**chem 126**

i did it i found 0.4 but wrong
*March 15, 2013*

**chem 126**

Phenolphthalein is a commonly used indicator that is colorless in the acidic form (pH < 8.3) and pink in the basic form (pH > 10.0). It is a weak acid with a pKa of 8.7. What is the ratio of the conjugate base concentration to the acid concentration, that is, [B-]/[HB] ...
*March 15, 2013*

**TRIGONOMETRY HELP**

Thank You!!!
*March 5, 2013*

**TRIGONOMETRY HELP**

Prove that: cos²Θ - sin²Θ = 2cos²Θ - 1
*March 5, 2013*

**scienses**

A solution contains 0.0180 M HNO3, 0.0268 M HI, and 0.250 M formic acid, HCOOH. What is the pH?
*March 4, 2013*

**TRIGONOMETRY HELP**

Thank You!!!
*March 4, 2013*

**TRIGONOMETRY HELP**

Prove that: (tan²Θ)x(sin²Θ) = (tan²Θ)-(sin²Θ) show work
*March 4, 2013*

**Art History**

What may have been one cause for the relative lack of artistic production in Florence during the High Renaissance (after the death of Lorenzo), and the relative increased artistic production in Rome during this period?
*February 24, 2013*

**Urgent Chem Help**

A certain substance has a heat of vaporization of 55.30 kJ/mol. At what Kelvin temperature will the vapor pressure be 3.50 times higher than it was at 361 K?
*February 10, 2013*

**Science**

Some nitrogen atoms have seven neutrons and some have eight neutrons. These two forms of nitrogen are: a. ions of each other b. phases of each other c. isotopes of each other and how exactly do you know? My book doesn't cover this at all yet its in my homework so im not sure
*February 5, 2013*

**Scientific Notation**

I got all of them so far EXCEPT this one... help? Thank you! Convert the following into scientific notation: 1/137
*January 23, 2013*

**Math**

Compute the following special functions. Keep the correct number of significant figures. 10^5.4 Can somewhere help me with this? Is it as simple as putting it into my calculator just like that? if so, how do I know what the correct number of sig figs are since the worksheet ...
*January 21, 2013*

**trig/sig figs**

There are 60" in 1', 60' in 1°, and 2π radians in 360°. Convert arc-seconds into radians. KEep 6 significant figures. If someone could help and walk me through this process, it would be soooo appreciated!
*January 17, 2013*

**multiplying and significant figs**

Thank you so much! What about 1300 * 2.16? I know that probably also looks very simple but sig figs are confusing me, such a new concept.
*January 17, 2013*

**multiplying and significant figs**

Multipy and keep only the correct number of significant figures. 101.6 * 3
*January 17, 2013*

**astronomy/conversion**

There are 365.25 days in a year, 24 hours in a day, 60 minutes in an hour, and 60 seconds in a minute. Convert years into seconds. Show your work and keep 5 significant figures. Ok, so finding it is easy (multiply 24, 60, 60 and 365.25) but how does the significant figures ...
*January 17, 2013*

**Significant Figures**

I'm having a hard time with significant figures. Any help would be appreciated. The first one is 0.0000000502. I put that it has three significant figures. Is this correct? The other numbers I haven't a clue about are: 5.52 299,792,458 206,265 I get the jist of it, but...
*January 16, 2013*

**Pre Calc**

1. Describe the linear programming situation for this system of inequalities. x<(or equal too)1 y>(or equal too)0 3x + y<(or equal too)5 2. Describe the linear programming situation for this system of inequalities where you are asked to find the maximum value of f(x, ...
*December 10, 2012*

**college bookkeeping**

You would be correct in assuming A or C if the question is reffering to the transaction analysis. The question reffers to "for a period". This would mean that the question is reffering to transfering the net income to the financial statements. The only financial ...
*November 19, 2012*

**algebra**

90 tiles
*September 26, 2012*

**physics**

It takes you 7.3 min to walk with an average velocity of 1.5 m/s to the north from the bus stop to the museum entrance. How far did you walk? Answer in units of m
*September 21, 2012*

**physics**

a couple part in a car on moonlit evening. Find that their car is stop in the sand. The women having studied physics, ties a rope to the car's bumper and stretches it around a tree in front of a car. She then pushes with 200 newton force against the horizontal. The cars ...
*September 21, 2012*

**physics**

water leaves a hose at a rate of 1.5kg/s with a speed of 20m/s and is aimed at the side of a car, which stops it (splashing back is ignored). what is the force exerted by the water on the car?
*August 28, 2012*

**physics**

suppose the glider is initially at rest at x=0, with the spring unstretched. You then apply a constant force in the +x direction with magnitude 0.610 N to the glider. what is the glider's velocity when it has moved 0.100m?
*August 22, 2012*

**physics**

suppose the glider is initially at rest at x=0, with the spring unstretched. You then apply a constant force in the +x direction with magnitude 0.610 N to the glider. what is the glider's velocity when it has moved 0.100m?
*August 19, 2012*

**stat**

for randomly selected adults, IQ scores are normally distributed with a standard deviation of 15. the scores of 14 randomly selected college students are listed below. use a 0.10 significance level to test the claim that the standard deviation of IQ scores of college students ...
*May 14, 2012*

**statistic**

suppose we wish to construct a confidence interval for a population proportion p. if we sample without replacement from a relatively small population of size N, the margin or error E is modified to include the finite population correction factor as follows: E=Za/2 pq/n N-n/N-1...
*April 17, 2012*

**trig**

Prove: sin(x–y)sin(x+y)=sin^2(x)–sin^2(y)
*March 26, 2012*

**Chemistry**

Given the following equation: Na2O + H2O ---> 2 NaOH. How many grams of NaOH is produced from 1.20 x 10^2 grams of Na2O? How many grams of NaO2 are required to produce 1.60 x 10^2 grams of NaOH?
*March 21, 2012*

**chemistry**

A plastic container with a mass of 30 grams gains 1,140 joules of heat. If the temperature of the container increases 20°C, what is the specific heat of the plastic in the container?
*January 4, 2012*

**smu**

In a bumper test, three types of autos were deliberately crashed into a barrier at 5 mph, and the resulting damage (in dollars) was estimated. Five test vehicles of each type were crashed, with the results shown below. Research question: Are the mean crash damages the same for...
*December 19, 2011*

**SMU**

A sample of 25 concession stand purchases at the October 22 matinee of Bride of Chucky showed a mean purchase of $5.29 with a standard deviation of $3.02. For the October 26 evening showing of the same movie, for a sample of 25 purchases the mean was $5.12 with a standard ...
*December 19, 2011*