Thursday

September 18, 2014

September 18, 2014

Total # Posts: 291

**Chemistry**

Find the pH of a solution prepared by taking a 50.0 mL aliquot of a solution prepared by dissolving 12.25g of NaOH and 250.0 mL of water and diluting that aliquot to 1.00L?
*January 20, 2011*

**Trig**

How do you convert rectangular equations into polar equations? If x4−y4=xy , then r2=atan(b); What is a? What is b?
*December 13, 2010*

**Trig**

How do you convert 36x + 7y = 8 into y=mx+b format?
*December 13, 2010*

**Trig**

A curve with polar equation r=(8)/7sinx + 36cosx represents a line. This line has a Cartesian equation of the form y=mx+b ,where m and b are constants. Give the formula for y in terms of x . For example, if the line had equation y=2x+3 then the answer would be 2x+3 .
*December 13, 2010*

**chemistry**

the rate of formation of NH3 is .15 mol/Lmin. What is the rate of this reaction? N_2_ + 3H_2_ ---> NH3 the answer should be .075 mol/Lmin.
*December 12, 2010*

**chemistry**

x + 2y ---> products is first order in c and 2nd order in y. what are the units of K, the specific rate constant, if the reaction rate is expressed in units of moles per liter per sec. I know the answer is M.s^-1^ but I don't understand this concept. could you explain ...
*December 12, 2010*

**chemistry**

From this information- a + c_2_ ---> ac + c Slow ac + a ---> a_2_c Fast 2a + c_2_ ---> a_2_c + c Overall -you know that it is 1st order in a, 1st in c2, and 2nd overall. how? what about a reaction being fast or slow tells you if it's in first or second order?
*December 12, 2010*

**chemistry**

SF4 ---> SF2 + F2 rate constant (k) = .011 l/molxS [SF4]2 How many minutes will it take for the concentration of SF4 to be reduced from 2.5 M to .25 M? I said this was a 2nd order reaction and used : (1/final)= kt + (1/initial) and solved for t. the answer should be 5.5. I ...
*December 12, 2010*

**chemistry**

How do you know that from this list, F2 is the strongest oxidizing agent? Mg2+ Mg F2 F- H+ Why is F- the weakest reducing agent from this list? Al3+ Al F2 F- K+
*December 9, 2010*

**chemistry**

In the following equation, which species is the oxidizing agent? KCLO3 --> KCL + KCLO4 In the same are, How do you know that Cu is the reducing agent in this equation: AgNO3 + Cu ---> Cu(NO3)2 + Ag
*December 9, 2010*

**chemistry**

Calculate the Gibbs free energy change for the reaction below when initial concentrations of CR3+ and Cu2+ are 1 M (F= 96500 J/V mole e-) 2Cr3+ (aq) + 3Cu (s) --> 2Cr (s) + 3Cu2+ (aq) I assume we use the deltaG= -nFE equation, but how do you know n when Cr is using 3 e- and...
*December 9, 2010*

**chemistry**

a cell is constructed by immersing a strip of silver in .10 M AgNO3 solution and a strip of lead in 1.0 M Pb(NO3)2 solution. A wire and salt bridge complete the cell. What is the potential of the silver electrode in the cell?
*December 9, 2010*

**10th grade**

jordan has 2 quarters, 1 nickel, and 3 dimes. if he took 1 out and then a second one without replacing the first coin, what is the probability that both coins were dimes?
*December 5, 2010*

**chemistry**

thanks!
*November 23, 2010*

**chemistry**

A(g)+ B(g) <---> C(g) + D(g) Kc= 144. If .4 mol of A and B are placed in a 2 Liter container, what will be the concentration of C at equilibrium? I said the concentration of A= .2 because (.4/2=.2) and because 1 mol of A = 1 mol of C, the concentration of C also = .2 But...
*November 23, 2010*

**chemistry**

A(g)+ B(g) <---> C(g) + D(g) Kc= 144. If .4 mol of A and B are placed in a 2 Liter container, what will be the concentration of C at equilibrium? I said the concentration of A= .2 because (.4/2=.2) and because 1 mol of A = 1 mol of C, the concentration of C also = .2 But...
*November 23, 2010*

**chemistry**

what is the pH of a solution that is .15 M in HOCl and .25 M NaOCl after .05 mol HCl/L has been bubbled into the solution? this is what I did: HOCl + H2O ----> H3O+ + OCl- .15 .25 -.05 +.05 --------------------------- .1 .30 3.5E-8=[H3O][.3]/[.1] H3O= 1.167E-8 pH= -log(1....
*November 23, 2010*

**chemistry**

thanks!!!
*November 23, 2010*

**chemistry**

Calculate the value of [H3O+] in a 0.01 M HOBr solution. Ka = 2.5E-9 I'm having a problem with just writing the equilibrium expression. do you add H2O to the HOBr? HOBr + H2O <---> H3O+ + OBr- but then you could say that because HOBr = .01 M, then 0Br- = .01 M, and ...
*November 23, 2010*

**chemistry**

The solubility of Fe(OH)2 is 3.00 10-3 g in 2.00 liters at 18°C. What is its Ksp at 18°C?
*November 15, 2010*

**chemistry**

How many grams of MgF2 will dissolve in 150. mL of 0.100 M NaF solution? Ksp for MgF2 = 6.4 x 10-9
*November 15, 2010*

**chemistry**

Calculate the ionization constant, Ka, of phenol (HC6H5O), a weak acid, if a 0.25 M solution of it has a pH of 5.24.
*November 15, 2010*

**chemistry**

The following system is at equilibrium with [N2O4] = 0.55 M and [NO2] = 0.25 M. If an additional 0.10 M NO2 is added to the reaction mixture with no change in volume, what will be the new equilibrium concentration of N2O4? N2O4(g) 2 NO2(g)
*November 15, 2010*

**chemistry**

What is the value of [OH-] in a 0.015 M CH3COOH solution? Ka = 1.8 x 10-5 I started by writing the equation: CH3COOH + H2O <---> H3O+ + CH3COO- Ka= [H3O+][CH3COO-]/[CH3COOH]= 1.8 E-5 ... Now what? I don't understand where OH relates to this ...
*November 15, 2010*

**chemistry**

If solid AgNO3 is slowly added to a solution that is .05 M in NaI and .12 M in NaCl, what is the concentration of I- when AgCl just begins the precipitate? Ksp for AgCl= 1.8 x 10^-10 Ksp for AgI= 1.5 x 10^-16
*November 13, 2010*

**chemistry**

If 100 mL of .03 M HCL solution is added to 100 mL of buffer solution which is .1 M in NH3, and .1 M in NH4Cl, what will be the pH of the new solution?
*November 13, 2010*

**chemistry**

what is the [H3O+] of a solution that is .01 M in HOCl and .03 M in NaOCl?
*November 13, 2010*

**chemistry**

A sample of only solid ammonium chloride was heated in a 1 L container at 500 C. At equilibrium, the pressure of NH3 (g) was found to be 1.75 atm. what is the equilibrium constant, Kc, for the decomposition at this temperature? R= .08206 L atm/K Mol NH4CL (s) <---> NH3(g...
*November 13, 2010*

**chemistry**

1.00 mol of A and 2.00 mol of B are placed in a 5 Liter container. after equilibrium has been established, .50 mol of D is present in the container. What is the equilibrium constant, Kc? A + 2B <---> 2C + D
*November 13, 2010*

**chemistry**

How many grams of potassium formate, KHCOO, must be added to 500 mL of a .07 M solution of HCOOH to produce a buffer solution with a pH of 3.50? given: Ka of HCOOH=1.8 x 10^-4
*November 13, 2010*

**Math**

Oh, ok thanks. I understand it now.
*October 21, 2010*

**Math**

Solve:(sec 35 degrees) (csc 55 degrees) - (tan 35 degrees) (cot 55 degrees)
*October 21, 2010*

**statistics**

The heights of a large population of students have a mean of 60" with a standard deviation of 3". What is the mean of the resulting distribution of sample means for n =16?
*October 17, 2010*

**Chemistry**

When in a solid form, NaCl (salt) is a neutral compound. When dissolved in water the ions dissociate (break apart) to form Na+ and Cl-. How does this explain why salt can conduct electricity when dissolved but not in solid form? _______________________________________________
*September 15, 2010*

**geometry**

At rosemead high school, 94 students take biology, 86 take ethnic studies, and 95 take geometry. thirty-seven students take both biology and geometry, 43 take geometry and ethnic studies, and 42 take ethnic studies and biology. twenty eight students take all three subjects. ...
*September 13, 2010*

**geometry**

At rosemead high school, 94 students take biology, 86 take ethnic studies, and 95 take geometry. thirty-seven students take both biology and geometry, 43 take geometry and ethnic studies, and 42 take ethnic studies and biology. twenty eight students take all three subjects. ...
*September 13, 2010*

**Marketing **

I need an idea for a future product or service to market for this class project, any ideas? Thank you in advance!
*September 1, 2010*

**Marketing **

I believe people are already doing this, how about a product idea. Something tha can be useful to people. Nothing too fancy please. Thanks!
*September 1, 2010*

**Marketing **

I need an idea for a future product or service to market for this class project, any ideas? Thank you in advance!
*September 1, 2010*

**Communication and Gender Studies**

How can children tell if “Big Bird” from Sesame Street is a boy or a girl bird and what gendered features does Big Bird use in his/her behavior, especially speech patterns and style?
*August 6, 2010*

**Physics - Inertial frame of reference**

= =
*August 3, 2010*

**Grammer**

Write five sentences about the role of education in successful financial planning, in which you correctly use a different verb tense in each sentence. Mark each verb used in bold and, in parentheses, identify the specific tense used.
*July 28, 2010*

**Communication and Gender Studies**

Why is it that the most effective way to humiliate a man is to make him look or act like a woman, or accuse him of looking or acting like a woman?! Does the reverse hold true? Would it be demeaning for a woman to act as a man?
*July 17, 2010*

**Communication and Gender Studies**

List titles and artists of contemporary or older songs in relationship to gender and family. What message do the lyrics of the song convey considering the relationship to gender and family?
*July 13, 2010*

**Communication and Gender Studies**

List titles and artists of contemporary or older songs in relationship to gender and family. What message do the lyrics of the song convey considering the relationship to gender and family?
*July 13, 2010*

**Communication and Gender Studies**

What are some good specific gender communication research questions? Any ideas for topics I can write about?
*June 26, 2010*

**Communication and Gender Studies**

How does the language we use, including the actual words that we have to name and describe things build our stereotypes?
*June 21, 2010*

**Communication and Gender Studies**

What are some male stereotypes and the role language had in shaping these stereotypes?
*June 19, 2010*

**Communication and Gender Studies**

Thanks for your help!
*June 1, 2010*

**Communication and Gender Studies**

These sources seem a bit outdated to me. What about some more recent material?
*June 1, 2010*

**Communication and Gender Studies**

In modern America, how does society define 'masculine' and 'feminine'? Do these characterizations appear restrictive? If so, how? If not, why not?
*June 1, 2010*

**spanish**

Mi madrastra
*May 2, 2010*

**Math**

how do I write a rule for this function? x: -4, 0, 2, 4 f(x): 4, 6, 7, 8
*April 24, 2010*

**another physics problem that i dont understnad..**

uhm where did you get 57.5? and what is M & g????
*April 15, 2010*

**history**

how did the u.s.involvement in vietnam in the 1950's impact the political climate
*March 28, 2010*

**Communication Language Studies**

Thanks Writeacher!
*March 20, 2010*

**Communication Language Studies**

Supply rhyme (Given a word "fish", offering "dish") Totally confused, may be it is just me, but I am not understanding what is asked for here? A rhyme? If so, referring to those words? If so, I am stil lost Please help. Thanks!
*March 20, 2010*

**Communication Language Studies**

Spit and image, or spitten image; could these be malapropisms for Spitting image?
*February 20, 2010*

**Communication Language Studies**

This is what I thought those meant! Now spitting image is going to make me think even more! Thanks for the help!
*February 20, 2010*

**Communication Language Studies**

I need to figure out the original words/phrases from the following malapropisms: Any ideas? Thanks! For all intensive purposes A blessing in the skies Spitting image
*February 20, 2010*

**Physics**

how do you convert pC to Coulombs?????
*February 17, 2010*

**Corporate Communications**

Thanks for your input!
*February 14, 2010*

**Corporate Communications**

I don't think there are any, but I was going to use this as an example from the past, and compare it to today where they say it is not good to smoke, yet they continue to promote it to people. Any thoughts?
*February 14, 2010*

**Corporate Communications**

What makes this site a good example? What about tobacco companies? Would this be a good example of unethical business communication to the public when they all said that ciggerates aren't addictive and dangerous, but now agree with the consensus of health agencies and ...
*February 14, 2010*

**Corporate Communications**

A writer may be somewhat unethical in his or her approach while using business oriented communications if they deliberately use incorrect or inaccurate information on a website or in a media kit. I need a real life example of this. Anyone have any ideas? Thanks!
*February 14, 2010*

**Mass Communication Studies**

Please provide at least one example of an appealing news lead from either a corporation or an organizations news rooms. Tell why the lead is appealing.
*February 5, 2010*

**Communication Language Studies**

Thanks for offering your point of view!
*January 24, 2010*

**Communication Language Studies**

I am talking about things like this: How often have you heard football and basketball teams and boxers say, ''It's going to be a war'' when it's just a game or a fight? OR an athlete described as a ''warrior'' when that athlete is merely...
*January 24, 2010*

**Communication Language Studies**

Have the use of war metaphors gone too far? More specifically, does it matter? that is, do these metaphors really influence how people think and act about movies, sports, politics and "real" wars? I would appreciate any feedback! Thanks!
*January 24, 2010*

**Science**

When the Sun is directly over the equator, we experience either _ or _ ? I'm not getting this. Do they mean what two seasons?
*December 7, 2009*

**statistics**

n=97,x=46;98% confidence
*December 6, 2009*

**government**

true or false the new jersey plan required that each state recieve the same number of seats in the federal legislature
*November 30, 2009*

**Mass Communication Studies**

Are the people at Fox News so good at what they do that they are destined to permanently damage American journalism?
*October 28, 2009*

**Communication Studies**

Consider the issue and implications of intentional news media bias. Why are large segments of the American news media audience either unable or unwilling to be better critical media consumers?
*October 28, 2009*

**Media Law**

No, but this is what happend, correct?
*October 18, 2009*

**Media Law**

What about the limitations put on the first amendment by the Patriot Act of 2001?
*October 18, 2009*

**Media Law**

In the aftermath of the 9/11/2001 terrorist attacks on America, and the resulting War on Terrorism by the United States, what is the reasonable and legal limitations on the First Amendment?
*October 18, 2009*

**Mass Communication Studies**

I think sadly you are correct, so I guess we got to accept what it is.
*October 13, 2009*

**Mass Communication Studies**

I agree, now where would you say the trend is leading in the near to moderate term?
*October 13, 2009*

**Mass Communication Studies**

SEXUAL CONTENT IN ADVERTISING AND MASS MEDIA PROGRAMMING Comment and discuss about this continued trend in the "liberalization" of media content despite the last few decades of conservative "family values" political movements and organizations - and their ...
*October 13, 2009*

**math**

ther are 33 students in the band. there are 6 more fifthgrade students than thirdgrade students. there are an equal number of third and fourthgrade students.how many thirdgrade students are in the band?
*October 1, 2009*

**Business Communication Studies**

Is instant messaging replacing many instances of e-mail for the same reasons that e-mail replaced many instances of printed memos and letters? Explain your answer.
*September 17, 2009*

**Algebra**

Thanks for the explanation!
*August 2, 2009*

**Algebra**

4? So the answer would be D? D. x = log_6 1296 This was my second guess but I wasn't sure so log_6 1296 would work?
*August 2, 2009*

**Algebra**

I would say B because 1296 = log 6^4 Is this correct?
*August 2, 2009*

**Algebra**

I know that x = 4 but the question asks to convert Convert 6^x = 1296 to a logarithmic equation. Here are my choices: A. 6 = log_x 1296 B. 1296 = log_6 x C. x = log_1296^6 D. x = log_6 1296 the line stands for the number or x being below the g in log, and the ^ stands for the ...
*August 2, 2009*

**Algebra**

Convert 6^x = 1296 to a logarithmic equation
*August 2, 2009*

**Algebra**

I must have a twin! lol...Hey can you tell me if this is correct? (a) Describe in words how the graph of f can be obtained from the graph of y = e^x. The graph of f can be obtained from the graph of y = e^x by off setting the graph by one. (b) What is the domain of f? x= {x...
*July 30, 2009*

**Algebra**

Let f(x) = e^x – 2 + 3 a. Describe in words how the graph of f can be obtained from the graph of y = e^x. b. What is the domain of f? c. What is the range of f? d. What is the y-intercept? State the approximation to 2 decimal places (i.e., the nearest hundredth).
*July 30, 2009*

**Algebra**

Thanks for pointing that out!
*July 29, 2009*

**Algebra**

Let y = f(x) y = (x + 3)/ (2x - 5) Switch x and y. x = (y + 3)/ (2y - 5) Multiply both sides by (2y - 5). 2xy - 5x = y + 3 Subtract 3 from both sides. 2xy - 5x - 3 = y Subtract 2xy from both sides. -5x - 3 = -2xy + y Factor the right side. -5x - 3 = y (-2x + 1) Divide both ...
*July 29, 2009*

**Algebra**

Which would be the inverse of this: Let f(x)=(x+3)(2x-5) f^ (-1) x = (5x - 3)/ (2x + 1) f^ (-1) x = (5x + 3)/ (2x - 1)
*July 29, 2009*

**Algebra**

Totally confused and have 5 more problems like this. Can someone explain each step for these questions? Thanks! Let f(x) = e^x–2 + 3. (a) Describe in words how the graph of f can be obtained from the graph of y = e^x. (b) What is the domain of f? (c) What is the range of ...
*July 28, 2009*

**Algebra**

Yes here they are (a) Describe in words how the graph of f can be obtained from the graph of y = e^x. (b) What is the domain of f? (c) What is the range of f? (d) What is the y-intercept? State the approximation to 2 decimal places (i.e., the nearest hundredth). (e) What is ...
*July 28, 2009*

**Algebra**

Totally confused! Got 5 more of these to do and need some guidence please. Let f(x) = e^x–2 + 3. (a) Describe in words how the graph of f can be obtained from the graph of y = e^x (b) What is the domain of f? (c) What is the range of f? (d) What is the y-intercept? State ...
*July 28, 2009*

**Algebra**

How would I calcualte these in a calculator to find the Logarithm of these abd round to four decimal places? log 8 1og 93,100 log 0.082
*July 27, 2009*

**Algebra**

Not too good with math, actually i am no good at it.
*July 23, 2009*

**Algebra**

I wasn't sure but it is A then?
*July 23, 2009*

**Algebra**

Find all of the zeros of the polynomial function and state the multiplicity of each. f (x) = (x^2 – 16)^2 A. – 4 with multiplicity 2 and 4 with multiplicity 2 B. – 4i with multiplicity 2 and 4i with multiplicity 2 C. 4 with multiplicity 2 D. 4 with multiplicity ...
*July 23, 2009*

**Algebra**

Thanks I chose B 10.4 Million. I am confident that this is the correct answer. Am I correct?
*July 22, 2009*

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