# Posts by Student

Total # Posts: 859

**Chemistry**

I got 1.11 x 10^-6 for K. Here is my work: x= 0.004 -2x= -0.008 (change for CH4) Equilibrium for CH4 is 0.087 - 0.008= 0.079 Change in eq for C2H2 is 0.004 and eq is 0.004 (=x) Change in eq for H2 is 0.012 Eq for H2 is 0.012 K= [C2H2][H2]^3/[CH4]^2 K= (0.004)(0.012)^3/(0.079)^...

*February 29, 2016*

**Chemistry**

The reaction of CH4 in 2CH4(g) ---->/<---- C2H2(g) + 3 H2 (g) is carried out at a different temperature with an initial concentration of [CH4]=0.087M. At equilibrium, the concentration of H2 is 0.012 M. Find the equilibrium constant at this temperature.

*February 28, 2016*

**Math**

C is incorrect- not 30,000

*February 25, 2016*

**Chemistry**

how does one go about finding the Tf of this equation 100Hf+100cw(Tf-0) + 300w(Tf-25) =0 and can you also explain what cw and Hf mean? i have no idea.

*February 24, 2016*

**Chemistry**

What is the final temperature and physical state of water when 250 grams of water at 85 degrees C is added to 80.0 grams of ice at -15 degree C? Is Tf= 109 C? Is it in the steam phase?

*February 24, 2016*

**Chemistry**

A 1.1% (w/w) solution of cocaine hydrochloride (molar mass 339.81 g/mol) in water. Calculate the molal concentration. Is it 0.0297 mol/kg?

*February 22, 2016*

**Math**

Please explain and show your work 2 3 -+- 3 4

*February 22, 2016*

**Chemistry-Dr.Bob 222**

1. The rate constant for a second order reaction has units of L mol^-1 s^-1. What are the units of the frequency factor, A, for a second order reaction?

*February 19, 2016*

**Chemistry**

Calculate the molal concentration. A 1% (w/w) solution of cocaine hydrochloride ( molar mass 339.81 g/mol) in water.

*February 18, 2016*

**Chemistry**

On a clear day at sea level, the partial pressure of N2 in air is 0.78 atm at 25 degres C. Under these conditions, the concentration of N2 in water is 5.3 x 10^-4 M. What is the partial pressure of N2 when the concentration in water is 3.5 x10^-4 M?

*February 17, 2016*

**Student**

On a clear day at sea level, the partial pressure of N2 in air is 0.78 atm at 25 degres C. Under these conditions, the concentration of N2 in water is 5.3 x 10^-4 M. What is the partial pressure of N2 when the concentration in water is 3.5 x10^-4 M?

*February 17, 2016*

**Economy**

Can anyone compare and contrast N. korea and S. Korea economic provisions on private property ? Then compare to the U.S. Economic provisions on private property ? I'm really confused and I don't know much of the subject. This was a Classwork qtn. Thanks.

*February 16, 2016*

**Economics**

4. Deregulation and the Cost of Trucking. Suppose the government initially limits the number of trucking firms that can haul freight. The market for truck freight is served by a single firm that produces five million ton-miles of service per year, where one ton-mile is the ...

*February 14, 2016*

**Chemistry**

A solution containing equal masses of glycerol, C3H8O3, and water has a density of 1.10 g/mL. Calculate the molality of glycerol. I got 11.9 m.

*February 14, 2016*

**Chemistry**

A first-order reaction has a half-life of 26.4 seconds. How long does it take for the concentration of the reactant in the reaction to fall to one-eighth of its initial value?

*February 14, 2016*

**Chemistry**

1. As the intermolecular forces between molecules increase in magnitude, do you expect each of the following to increase, decrease or remain the same? My answers: Viscosity: increase Boiling point: increase Vapor pressure: decrease Surface tension: increase Heat of ...

*February 14, 2016*

**Chemistry**

A solution containing equal masses of glycerol, C3H8O3, and water has a density of 1.10 g/mL. Calculate the molality of glycerol. I got 11.9 m.

*February 14, 2016*

**Chemistry**

1. As the intermolecular forces between molecules increase in magnitude, do you expect each of the following to increase, decrease or remain the same? My answers: Viscosity: increase Boiling point: increase Vapor pressure: decrease Surface tension: increase Heat of ...

*February 13, 2016*

**Chemistry-Dr.Bob**

The solubility of CO2 in water at 25 degrees Celsius and P CO2= 1 atm is 0.034 mol/L. What is its water solubility under normal atmospheric conditions (in air, carbon dioxide is about 380 ppmv assuming that CO2 obeys Henry's Law?

*February 13, 2016*

**mATH**

You guys are in CCA? This is cheating and against the rules.

*February 8, 2016*

**Math**

The volume of a rectangular prism is 6x^3 -x^2 -2x. Which model could represent the rectangular prism? A. Height: 3x-2 Length: 2x+1 Width: x B. Height: 3x+2 Length: 2x-1 Width: x C. Height: 3x-2 Length: 2x-1 Width: x D. Height: 2x-2 Length: 3x+1 Width: x I don't understand...

*January 29, 2016*

**Math, pre-algebra**

The volume of a rectangular prism is 6x^3 -x^2 -2x. Which model could represent the rectangular prism? A. Height: 3x-2 Length: 2x+1 Width: x B. Height: 3x+2 Length: 2x-1 Width: x C. Height: 3x-2 Length: 2x-1 Width: x D. Height: 2x-2 Length: 3x+1 Width: x I don't understand...

*January 29, 2016*

**Connexus Help me!!**

Congratulations, Shantee!! When is your baby due? Is it a boy or a girl? Good for you!

*January 27, 2016*

**Math**

Our difference is 6. We have a sum of 14. What numbers are we? We know number 10. How did you find 4? Please describe and solve the riddle.Write the number sentence.

*January 26, 2016*

**Math**

F(x) = square root of x-6 -5

*January 22, 2016*

**Algebra**

Find the perimeter of the triangle whose vertices are the following specified points in the plane (-2,-7) (1,-6) and (-7,7)

*January 13, 2016*

**Algebra**

Find the perimeter of the triangle whose certified are the following specified points in the plane (5,-1) (-9,3) and (0,1

*January 12, 2016*

**U.S History**

Ms. Sue please help I really need it!!!

*January 5, 2016*

**U.S History**

Which of these describes the location of the Gulf of Mexico? (5 points) South of West Florida East of East Florida*** West of New Orleans South of Great Britain 4. © 2012 The Exploration Company What can you infer about what Lewis and Clark saw as they moved west from the...

*January 5, 2016*

**U.S History**

Ms. Sue please help!!!!

*January 5, 2016*

**U.S History**

Which of these describes the location of the Gulf of Mexico? A. South of West Florida B. East of East Florida C. West of New Orleans D. South of Great Britain I think its A.

*January 5, 2016*

**Algebra**

The perimeter of a square must be greater than 40 inches but less than 94 inches. Find the range of possible side lengths yay satisfy these conditions.

*January 5, 2016*

**Algebra**

8w less than or equal to 9w - 5 or 1-4w > 25. Enter the solution using interval notation?

*January 5, 2016*

**Algebra**

Among all rectangles that have a perimeter of 184, find the dimensions of one whose area is largest. Write your answers as fractions reduced to lowest terms.

*January 4, 2016*

**Math**

Find the standard form for the equation for the circle center (-4,7/4) and tangent to the y axis

*January 4, 2016*

**Algebra**

Compare the graph of a compound inequality involving and with the graph of a compound inequality involving or.

*December 21, 2015*

**Algebra**

What compound inequality represents the phrase "all real numbers that are greater than or equal to 0 and less than 8"

*December 21, 2015*

**Algebra**

Write an inequality for Six times a number increased by 38 is no more than the number decreased by 14

*December 20, 2015*

**Algebra**

Whats an inequality for negative three sevenths of a number is at least 102.

*December 20, 2015*

**Phyical Science**

I already got the answer

*December 14, 2015*

**Phyical Science**

Which is more expensive to create wind power or natural gas?

*December 14, 2015*

**Inequalities**

Write two different inequalities that you can solve by adding 5 and multiplying by -3.

*December 13, 2015*

**Math**

A system of equations is shown below: x + y = 3 2x − y = 6 The x-coordinate of the solution to this system of equations is _____. I'm thinking it could be X=3

*December 11, 2015*

**Math**

Steve, what is dr/dt? how did you get 1/8pi?

*November 30, 2015*

**Health ( ANSWER ASAP)**

what are the answers?

*November 30, 2015*

**Math**

Thx so much

*November 11, 2015*

**Math**

hello what is b + 6 1/8= 5 3/4

*November 11, 2015*

**Algebra Math**

Thank you!!

*November 11, 2015*

**math**

These were the multiple choice answers given to me for this problem which don't seem to make sense because I keep getting $4200 A. $3122.18 B. $4994.50 C. $4440.73 D. $86776.40

*November 9, 2015*

**Physics**

If a ball has a weight of 6.8N what is the centripetal force of the string

*October 21, 2015*

**Math**

ok thanks again.

*October 19, 2015*

**Math**

ok thank u

*October 19, 2015*

**Math**

the end without the tip

*October 19, 2015*

**Math**

what is the measurement of the end of a crayon in cm

*October 19, 2015*

**Math**

thank u

*October 19, 2015*

**Math**

what is the size of a crayons top tip in centimeters?

*October 19, 2015*

**Math**

hi what is m/3+6=3

*October 18, 2015*

**AQ4.1.1 MICROMORPH MODULE**

Consider a small module based on interconnected tandem cells of hydrogenated amorphous and microcrystalline silicon as depicted in the figure below. The Voc of a single tandem cell is 1.35V and the short-circuit density Jsc is 12mA/cm2. b) Voc,module=16.2V, Isc,module=120mA B ...

*October 10, 2015*

**CIGS AND CDTE FABRICATION**

During manufacturing of a CIGS device, the metal back contact is deposited first, while in case of the CdTe solar cells, the back contact is deposited in the last processing step. What are the configurations of both cells: a) Both the CI(G)S and CdTe solar cells are made in ...

*October 10, 2015*

**Language Art**

I Lost the story to this assingment

*September 30, 2015*

**Language Art**

2.)Why does the author of "The Drummer Of Shiloh" say it is a "Solemn Night For a boy just turned fourteen"? A.)The wind is full of whispers B.)The Army is Camped near a church C.)The boy will be his 1st battle soon D.)The boy does not like sleeping in a ...

*September 30, 2015*

**Language Art**

thank you its C

*September 30, 2015*

**Language Art**

I Lost the story so I cant , can you help me find the answer????

*September 30, 2015*

**Language Art**

1.)In "The Drummer Boy Of Shiloh", what does the general call the drummer boy? A.)The BRAINS OF THE ARMY b.)The Heart Of The Army C.)The Backbone of the army D.)The PRIDE OF THE ARMY

*September 30, 2015*

**Math**

Will runs 6 laps before Megan joins him at the track. They then run together at the same pace. Represent the relationship between the number of laps Will runs + Megan runs.

*September 29, 2015*

**Math**

Simplify -(a + 5)

*September 23, 2015*

**Math**

Part 2: Once the tiles were laid, mahogany floor trim was installed around the perimeter of the floor. The trim cost $11.85 per foot. Determine the perimeter of the room and the total cost of the floor trim that was installed

*September 20, 2015*

**Math**

Thx Owen

*September 20, 2015*

**Math**

your management company was hired to take over the maintenance of the room. last year the old floor tiles were replaced with spanish portico special ceramic tiles. the tiles cost $13.50 per square foot. the owner paid $6534 for the tiles. Determine the area of the room!!

*September 20, 2015*

**Math**

Thank u Stephanie! Helps a lot :)

*September 17, 2015*

**Math**

How is the area of a square related to its side length?

*September 17, 2015*

**Math**

The Eatery Restaurant has 200 tables. On a recent evening, there were reservations for fraction 1/10 of the tables. How many tables were reserved?

*September 16, 2015*

**Math**

Thank you, Steve

*September 13, 2015*

**Math**

At present, the sum of the ages of a father and his son is 33 years. Determine the smallest number of years until the father's age is 4 times the son's age.

*September 13, 2015*

**Math**

Hi what is (z-3^2)? I think it equals (1-9). Is that correct?

*September 10, 2015*

**Math**

Thanks Ms. Sue

*September 10, 2015*

**Math**

What is (z×6)???

*September 10, 2015*

**Math**

I got 120 by multiplying 300 and .6 equals 180 then minus 300 equals 120...im confused isn't this right?

*August 27, 2015*

**civics**

John knows many people who feel that small business need more support from the government. They support tax break and other benefits for small business owners. Which of the following best describes the most effective type of action these people could follow? A. attack the ...

*May 30, 2015*

**help please**

Is it B?

*May 30, 2015*

**civics**

Is it C.?

*May 30, 2015*

**civics**

The First Amendment to the Constitution protects freedom of speech and of the press. Which of the following examples best demonstrates the constitutional rights? A. An advertisement contains incorrect information about a company's products. B. A man yells, "Fire!&...

*May 30, 2015*

**civics**

A political communication that uses a picture to represent something else is an example of ______. A. bias B. prejudice C. propaganda D. symbolism I think the answer is D.

*May 30, 2015*

**civics**

Thank you!

*May 30, 2015*

**civics**

Which of the following would be part of the Republican Party Platform? A. creating a new health care system B. banning hand gun use C. reducing the size of government D. raising taxes on the wealthy I think the answer is C.

*May 30, 2015*

**civics**

is it b.?

*May 29, 2015*

**civics**

gabaloolo one year ago which of the following correctly describes an example of how climate affects the economy of countries in North America? (3 points) a. Countries that have varying climates will often also have unstable economies. b. There are not enough crops to grow in ...

*May 29, 2015*

**civics**

It didn't say anything about this topic.

*May 29, 2015*

**civics**

Which of the following businesses would prefer a weak U.S. dollar to a strong one? A. A Saudi Arabian company that exports oil to the United States B. An American company that imports clothing from Italy C. A Turkish company that imports microchips from the United States D. A ...

*May 29, 2015*

**civics**

Which of the following businesses would prefer a weak U.S. dollar to a strong one? A. A Saudi Arabian company that exports oil to the United States B. An American company that imports clothing from Italy C. A Turkish company that imports microchips from the United States D. A ...

*May 29, 2015*

**civics**

I have a couple of more questions I need to check, can you check them for me please?

*May 29, 2015*

**civics**

is it B?

*May 29, 2015*

**civics**

Which of the following actions is most typical of foreign policy intervention? A. The president creates a new economic plan. B. A task force is asked to investigate a possible free trade violation. C. The Environmental Protection Agency regulates automobile emissions. D. A new...

*May 29, 2015*

**Math**

A bag contains tiles with the letters -C-O-M-B-I-N-A-T-I-O-N-S. Lee chooses a tile without looking and doesn't replace it. He chooses a second tile without looking. What is the probability that he will choose the letter O both times? A) 1/132 B) 1/72 C) 1/66 D) 1/23 Is the...

*May 28, 2015*

**Science**

Which of the following describes the use of a renewable energy source? A. using natural gas to heat a house B. using a windmill to grind grain C. using petroleum to run a car D. using coal to generate electricity I think the answer is B.

*May 27, 2015*

**math**

Ok, SERIOUSLY? WHY are you cheating on the test? That is super wrong and if you get caught then you'll be expelled and that would look HORRIBLE on you college application for cheating. You are smart, you just need to study and stop cheating!!!! I hope the guilt keeps you ...

*April 28, 2015*

**Civics**

Which of the following statements would you place in the section labeled F? F is under disadvantages of democracy. A. Very little holds the nation together, and local governments can leave anytime. B. The central and local governments may have conflicts and power struggles. C...

*April 28, 2015*

**Civics**

Leaders from several states of a nation meet once a year to settle common issues. They govern their own states independently, but they work together on issues that affect them all like trade and defense. They do not have a central government that handles these matters or ...

*April 28, 2015*

**Civics**

Is it C?

*April 28, 2015*

**Civics**

Which of the following statements would you place in the section labeled F? F is under disadvantages of democracy. A. Very little holds the nation together, and local governments can leave anytime. B. The central and local governments may have conflicts and power struggles. C...

*April 28, 2015*