Wednesday

August 20, 2014

August 20, 2014

Total # Posts: 326

**chem**

For the gaseous equilibrium represented below, it is observed that greater amounts of PCl3 and Cl2 are produced as the temperature is increased. PCl5(g) <===> PCl3(g) + Cl2(g) a) What is the sign of S° for the reaction? Explain. b) What change, if any, will occur in ...
*April 29, 2008*

**Brainteaser**

It could be. I think the question leaves too much to the imagination!
*April 16, 2008*

**Brainteaser**

A man is on his hands and knees looking for a £5 note he has dropped. His search for the fiver continues for some time. Finally in the corner of the room he finds it. What is the first thing he does? Anyone know this?????
*April 16, 2008*

**language arts**

a person who studies and collects rocks for fun
*March 17, 2008*

**Chemistry**

Predict the sign of ( ∆H) in each of the following reactions: NH3 (g) + HCl (g) NH4Cl(s) ∆S = +, ∆G = - Fe (s) + Cu+2 (aq) Fe+2 (aq) + Cu(s) ∆S = +, ∆G = - Cl2 (g) + 2Na (s) 2NaCl (s) ∆S = +, ∆G = -
*February 8, 2008*

**science**

Predict the sign of ( ∆H) in each of the following reactions: NH3 (g) + HCl (g) NH4Cl(s) ∆S = +, ∆G = - Fe (s) + Cu+2 (aq) Fe+2 (aq) + Cu(s) ∆S = +, ∆G = - Cl2 (g) + 2Na (s) 2NaCl (s) ∆S = +, ∆G = -
*February 8, 2008*

**chemistry**

sorry, didnt even see that. how does 0.6973 sound?
*February 8, 2008*

**Science**

i want to know how you could get electric to an island in the middle of nowhere.
*December 18, 2007*

**Physics: Equilibrium and Inclined Planes**

12.8
*October 28, 2007*

**Geometry**

okay, thanks anyway.
*October 3, 2007*

**Geometry**

How do you divide a hexagon into 9 congruent parts?
*October 3, 2007*

**Geometry**

Find the value of z. Then find GE and EH and state whether E is the midpoint of line GH. GH = z + 6. EH =2z-4. GE=z.
*September 4, 2007*

**Spanish**

One of the countries in Central America uses Spanish as the official language of the country but also has 23 different Maya groups; each with its own dialect. What country is it?
*September 3, 2007*

**math**

what would x^2+y^2-4x+2y=0 (Equation for a cirlce) be in r^2=(x-h)^2(y-k)^2 form? tnx I will start you off... x^2+y^2-4x+2y=0 x^2-4x+y^2 +2y =0 x^2-4x+ 4 + y^2 +2y+ 4 =+ 4+ 4 (x^2-4x+ 4) + (y^2 +2y+ 4) =8
*June 1, 2007*

**Math**

Hi how would i solve this?? The equation of the cirlce is x^2+y^2-4x+2y=0. Determine the coordinates of the center and the radius of the circle. What do i do? anyone
*May 31, 2007*

**Math**

hi how would we solve a question like this? for the curve with eq'n 2x^2 - x - 1 y= _______________ x^2 - 2x - 3 determina all x- and y-intercepts I assume you meant y = (2x^2 - x - 1)/(x^2 - 2x - 3) both top and bottom factor but there is no advantage gained. However, the...
*May 21, 2007*

**Math**

I have no clue how to do this as no values were given and im confused. can someone explain plz? if x^3-y^3=m and x-y=N, express xy in terms of M and N This is one of those pure manipulation problems. you have to know that x^3-y^3 = (x-y)(x^2+xy+y^2) so n(x^2+xy+y^2)=m (x^2+xy+...
*May 3, 2007*

**math-factoring**

hi i was reading through the tutorials and havent really understood how to factor out a trinomial like 12x^4 - 5x^2y^2 - 2y^4 what would the 1st few steps be? Do a substitution: let v= x^2 and u= y^2 Now you have... 12v^2 - 5uv - 2u^2 (3v -2u)(4v+u) then go back and put the x ...
*May 1, 2007*

**math**

I'm not good at math! I need help with finding a decimal from a fraction. like 1/3, 13/15, 19/32 I can't figure out how to turn it into a decimal! Just divide the numerator by the denominator. Use long division or a pocket calculator. can u help mme because i get f,s ...
*March 13, 2007*

**why is noone answering my question?!?!**

A rational function that passes through (0,0) and (4, 8/7) has the x-axis as a horiztonal asympotote. It also has 2 vertical asymptotes x=3, x=-3. I understand that to set it up, it is y= ax+b / (x+3)(x-3). I dont understand how to solve for a and b. Put in the points. You ...
*January 28, 2007*

**rational functions**

A rational function that passes through (0,0) and (4, 8/7) has the x-axis as a horiztonal asympotote. It also has 2 vertical asymptotes x=3, x=-3. I understand that to set it up, it is y= ax+b / (x+3)(x-3). I dont understand how to solve for a and b.
*January 27, 2007*

**rational functions... PLEASE HELPPPPP**

A rational function that passes through (0,0) and (4, 8/7) has the x-axis as a horiztonal asympotote. It also has 2 vertical asymptotes x=3, x=-3. I understand that to set it up, it is y= ax+b / (x+3)(x-3). I dont understand how to solve for a and b.
*January 27, 2007*

**chem**

what does coefficients in equations mean, in chemical terms? 2NaCl means we have two molecules or 2 mols of NaCl. Most texts caution us not to use molecules but to stick with the latter part of the definition (moles); however, I don't have any problem with saying, 2H2 + 2 ...
*January 25, 2007*

**chemistry 12**

what is the relationship between ka and kb? Kw=ka*kb
*December 16, 2006*

**chemistry**

When 1.0 mol of ammonia gas in injected into a o.50L flask, the following reaction proceeds to equilibrium. 2NH3 <--> N2 (g) + 3H2 (g) At equilibrium, 0.30 mol of hydrogen gas is present. a) calculate the equilibrium concentrations of N2 and Nh3. b) what is the value of ...
*November 26, 2006*

**lord of flies essay approach**

CHEAT
*September 12, 2006*