Thursday

August 27, 2015
Total # Posts: 1,440

**-Chemistry-**

I have asked this question before but I was wondering if I solved this question correctly. A solution of barium chromate is prepared by dissolving 6.3 x 10-3 g of this yellow solid in 1.00 L of hot water. Will solid barium chromate precipitate upon cooling to 25°C? You ...
*May 14, 2007*

**CHEM!**

Okay well I suddenly got confused for a lab I did We took pH meter than we calibrate it. Then we measure the pH of the acetic acid solution, which was used to determine the Ka of the acetic acid using the first method. We made a 1M solution of NaOH which was used to titrate 50...
*May 9, 2007*

**Chemistry``**

I answered this question but I did not get the right answer. CO2 + H2 <=> H2O + CO CO2 = 0.5 mole and H2 he 0.5 mole both sollutions were forced into a 1 Litre container. K = 2 what is the equlibrium concentration of each reactant and product. as I calculated I did the ...
*May 8, 2007*

**Chemistry``**

A substance (CD) decomposes into C and D. CD(g) C(g) + D(g) At the temperature of the experiment, 15.0 percent of CD is decomposed when equilibrium is established. a) If the initial concentration of CD is 0.200 mol/L, what are the equilibrium concentrations of...
*May 8, 2007*

**Chemistry**

In a previous experiment, 0.800 g of the green complex iron salt was placed in an Erlenmeyer flask and heated with concentrated sulfuric acid until all oxalate ion was destroyed (CO2, SO2 and H2O are formed). Ferric ion (Fe3+) remained in solution and was reduced to Fe2+ by ...
*May 7, 2007*

**Chemistry**

Assuming the dissolution of borax in water is a spontaneous reaction, do you expect the change in enthalpy to be positive or negative or are both signs possible? Explain your answer A. Neither, enthalpy does not change, the positive entropy for the dissolution, leads to –...
*May 7, 2007*

**CHEM!**

Well I almost understand this question but still got stuck, I will show you the question and my answer so I need someone to tell me if I did it correctly or not and how I should fix it. at 55degrees the K for the reaction: 2NO2(g)<=>N2O4 is 1.15 calc the concentration of...
*May 2, 2007*

**CHEM!!**

One mole of NH3 was injected into a 1 L flask at a certain temperature. The equilibrium mixture
*May 2, 2007*

**Chemistry**

A solution of barium chromate is prepared by dissolving 6.3 x 10-3 g of this yellow solid in 1.00 L of hot water. Will solid barium chromate precipitate upon cooling to 25°C? Proof? You want to compare Qsp to Ksp (at 25o C.) Ag2CrO4(s) ==>2Ag^+ + CrO4^= Ksp = (Ag^+)^2(...
*May 2, 2007*

**Chemistry**

How can you increase the concentration of the product (s) in each of these reactions by varying the temperature and pressure (caused by volume change)? 4NH3 + 5O2 <=> 4NO + H2O Delta H = -903.75 kJ Br2 + Cl <=> 2BrCl Delta H = 14.64 kJ Please help... With gaseous ...
*May 2, 2007*

**graphing question**

Write the equation of the line with slope 4 and y-intercept (0, –5). Then graph the line i wrote the equation which i think is y=4x-5 i point the y intercept (0,-5) in the graph how do i find the other point would the 4x become 4/1 x y=4/1x-5 then move run and rise run of...
*April 13, 2007*

**algebra 1 help**

One number is 6 more than another. If the sum of the smaller number and 3 times the larger number is 34, find the two numbers. what am i suppose to do i am reading as this but i know i am wrong 34=(x+6)+y*3 n + 3(n+6)=34 n is the smaller. the sum of the smaller and three times...
*March 30, 2007*

**inequality expresion**

The cost of a long distant telephone call is $0.36 for first minutes and $0.21 each additional minutes or portion thereof. Write an inequality representing the number of minutes a person could talk with out exceeding $3.00 would this be written as 0.36+0.21(x-1)<$3.00 0.36...
*March 27, 2007*

**Statistics**

Part 2 - The president of the company is uncomfortable with the precision of the estimates derived for the sample mean. They are not willing to tolerate a very large error. e = .04, how large would the sample size have to be if they specify a 98% confidence level? Formula: n...
*March 13, 2007*

**Statistics**

An entertainment company owns and operates movie theaters in Wyoming. The president of the company is concerned that film rentals are hurting the business. They directed a staff member to estimate the total number of films rented by households in Wyoming in a particular month...
*March 13, 2007*

**Stats**

A bottling company uses a filling machine to fill glass bottles with mango juice. The bottles are supposed to contain 300 milliliters (ml). In fact the amounts vary according to a normal distribution with mean = 298 and standard dev = 3 ml. What is the probability that an ...
*March 13, 2007*

**Statistics**

A building contractor claims that they can renovate a 200 sq foot kitchen and dining room in 40 work hours plus minus 5 (the mean and standard deviation respectively). The work includes plumbing, electrical installation, cabinets, flooring, painting and installing new ...
*March 13, 2007*

**Statistics**

I'm desperate I don't know how to calculate this, I always get a different answer, someone give me step by step please. P(3)=P(x=3;n=5!p=0.5) =5! x(0.5)3x(1- P(3)=P(x=3;n=5!p=0.5) =5! x(0.5)3x(1-0.5) 5-3 = 031250 _______ 3!(502)!
*March 12, 2007*

**Econ-Returns to scale**

Determine whether returns to scale is decreasing, increasing or constant: Q = 2K + 3L + KL Take a shot. Hint: increase both K and L by, say 10%. Does Q rise by more than 10% (increasing), less than 10% (decreasing), or exactly 10% (constant)
*March 10, 2007*

**math ..PLEASE HELP !!!**

A local bank reports that 70% of its customers maintain a chequing acct, 50% have a savings acct and 40% have both.If a customer was chosen at random a) what is the probability customer has a chequing or saving acct b)probability the selected customer has neither c)probability...
*February 23, 2007*

**Statistics**

Restaurant built in Edmonton has 80% chance of 1 year. If built in St Albert survival falls to 65%.Estimated chance St Albert is available is 60% and Edm 40%. A)Probability the restaurant will survive 1 year B) be built in Edm and last 1 yr C) be built in St Albert , given ...
*February 21, 2007*

**Calculus help**

\documentclass{article} \usepackage{amssymb,amsmath,amscd,concmath} \pagestyle{empty} \begin{document} \begin{equation*}\int_{1}^{3} [(e^3/x)/(x^2)]\, dx\end{equation*} \end{document} Sorry,the html format does not work... How to find the integral of [e^(3/x)]/(x^2) from 1 to ...
*February 20, 2007*

**Plato's Allegory of Cave**

Has anyone read the Plato's Allegory of Cave before? I got an assignment which is write a journal after reading this, but I really did not understand what it is talking about. Can anyone tell me something about it? Thanks. This site may help you. http://en.wikipedia.org/...
*February 16, 2007*

**Chemistry**

Is dissolving salt in water an example of reversible? I don't think so because once salt is in water, the water is not clear anymore. Pls help. thanks. Yes, it is reversible. One ca physically separate the salt and water (evaporation) What do you mean by not clear? When ...
*February 14, 2007*

**Science**

Wil kinetic energy increase or decrease based on the amount of potential energy it starts with?? If potential energy is lost, KEnergy increases. Potential Energy + kinetic energy= constant.
*February 5, 2007*

**another voting question**

Casting a vote based on what a candidate pledges to do about certain issues is called: prospective issue voting or retrospective issue voting Isn't this called prospective issue voting? yes... you are right. My experience is it more closely relates to wishful thinking.
*January 21, 2007*

**Voting Question**

Which is true? 1.People are more likely to vote in presidential elections than they are to vote in congressional elections. (or) 2.People are more likely to try to persuade how someone else will vote than they are to read about campaigns in the newspapers. I say 1 is true, my ...
*January 21, 2007*

**Literature**

Do you think the title "Huswifery" is a good title for Edward Taylor's poem? Why? Linda, if you will tell us what you think about this title, we will be happy to give you suggestions. We don't do your homework for you. hopkin's use of "seared,"...
*January 21, 2007*

**Democrats vs. Republicans 2000 platform-- Question**

Which of the following best describes the difference between the Democratic and Republican party platforms in 2000 on the issue of school choice? 1. Republicans favored increasing property taxes that private schools have to pay. 2. Democrats favored closing schools where ...
*January 21, 2007*

**algebra**

Can someone please help me with this? Solve x^3-3x^2-10x=0 by factoring. Take out x. x(x^2-3x-10)=0 For the polynomial inside the parentheses, you want factors of 10 that will add or subtract to give 3. 10 and 1 gives 11 or 9 so that is no good. But 5 and 2 are ok. 5*2=10 and ...
*January 11, 2007*

**religion , edit**

This course is really diffucult and there are many good answers to the question . I just want to say in looking for ideas on appropiate ways to answering the question is what I ma looking for not to cut and paste someone elses work. I want to learn from this course and try and...
*January 10, 2007*

**english**

If you are using a song title in an essay is it in italics or quotes? If you are using lyrics from a song is it in italics or quotes? Song titles and lyrics should be enclosed in quotation marks. okay, thanx
*January 4, 2007*

**english (to kill a mockingbird)**

Okay, so a mockingbird is used to symbolize someone innocent as in Lee's theme, don't kill mockingbirds aka don't kill the innocent. This is what it says on Sparknotes. It also says that Boo Radley is considered a mockingbird. I'm a little confused as to why. I...
*January 4, 2007*

**Jewelry markings**

I HAVE A RING & INSIDE THE BAND IT HAS H&S CROWN SYMBOL 18 ANCHOR SYMBOL W EACH MARKING IS LIKE A BOX INDENTED BY THEMSELVES. WHAT DO THESE MEAN?
*December 17, 2006*

**Pre-Calculus**

Solve for x,y,z, & w using the Gauss-Jordan Elimination Method 5x+3y+z+5w=-2 3x+2y+2z+4w=2 2x+4y+3z-3w=-11 4x-3y-2z+2w=-3 Can anyone help me please? Thanks.... What is the Gauss-Jordan Elimination Method?
*December 5, 2006*

**Chemistry**

I will also say sulfur and oxygen
*November 16, 2006*

**Math help please *calculus***

ok im having a bit of a problem rationalizing denominators. i have 2 to the root of 3 +4 divided by the root of 3. I have tried multiplying the top and bottom by the root of 3 and the answer, but then i get stuck at this part. Do i multiply 4 by 4 and make it a root? or am i ...
*October 15, 2006*

**PLease Help!!!Algebra**

The line y = 3x + 5 crosses the y axis at ______? When it crosses the y-axis x has to be 0, so what is y when x=0 in the equation y = 3x + 5 Isn't it 5? Hmm, you don't sound too confident with your answer, but yes, it's 5. If you have an equation y=mx+b, m is the ...
*October 11, 2006*

**Array**

thanx sooooo much! iv been waiting for hours to get my homework done for that stupid question! thanx!
*August 29, 2006*

**homework**

the phrase mid-may is an example a. assonance b. consonance c. alliteration d. metaphor
*July 3, 2006*