Science & Mathematics - 17 November 2007

would you normally expect ∆H° to be positive or negative for a voltaic cell? Justify your answer.

can anyone please help me answer this question?
thanks

2007-11-17 10:10:39 · 1 answers · asked by abc 1 in Chemistry

I have a Monstera, AKA, split leaf philadendron. In my plant book it says that under ideal conditions it creates a fruit called a Mamay fruit that tastes like a creamy pineapple/banana. It also says that it rarely happens indoors. I'd like to defeat the odds, grow the fruit, and feast on such glory. Tips?

2007-11-17 10:09:05 · 4 answers · asked by Anonymous in Botany

Calculate the voltage of the following cell:
Zn │ Zn^2+ (0.10M) ║ Cu^2+ (0.40M) │ Cu

can anyone please help me solve this problem? and show how it is done.
thank you

2007-11-17 10:05:06 · 1 answers · asked by abc 1 in Chemistry

can you please tell me the website were you found the information it would be a lot of help! Thanks!!!

2007-11-17 10:04:04 · 4 answers · asked by Anonymous in Medicine

2007-11-17 10:03:57 · 7 answers · asked by The Lone Trumpeter 2 in Mathematics

soo how dus dis work?
its confusing

2x+5y=7
x+4y=2

help me please

2007-11-17 10:00:54 · 4 answers · asked by ninnis 1 in Mathematics

a. Handbook of Injectable Drugs
b. Redbook
c. Remington's
d. Martindale's

2007-11-17 09:57:53 · 4 answers · asked by Anonymous in Medicine

2007-11-17 09:54:50 · 7 answers · asked by luckybob88 1 in Mathematics

If increasing the concentration of a reducing or oxidisng agent increases its 'reducing' or 'oxidising' power why does the redox potential plateau once you get to a very high concentration? Why does it not continue to get higher/lower with increasing concentration of the solution in question?

2007-11-17 09:53:36 · 1 answers · asked by Anonymous in Chemistry

(hence it can go 186,000 miles per second instantaneously without acceleration) then how can it provide a "push" for instance on solar sails in space. How can mere energy "push" or apply a physical force on matter?

2007-11-17 09:52:32 · 3 answers · asked by Anonymous in Physics

I am doing some work on redox reactions and I was wondering if anyone knows the half redox reaction when H2O2 is acting as an oxidising agent?

And does this half reaction depend on what it is reacting with or is it independent as long as it is oxidising something?

Thanks

2007-11-17 09:44:40 · 2 answers · asked by Anonymous in Chemistry

2007-11-17 09:43:34 · 8 answers · asked by Anonymous in Physics

2007-11-17 09:43:02 · 1 answers · asked by Anonymous in Astronomy & Space

2007-11-17 09:42:28 · 4 answers · asked by whoopsidaisy 3 in Physics

the equations is y=xe^x. i'm not sure if my 2nd derivative is right..& if it is....when you set it = to 0 ..lookssss extremely confusing. i'm not even sure if my f'(x) is right

f'(x)= e^x+xe^x
my f''(x) = e^x(xe^x)+e^x(e^x+xe^x)
so u're supposed to do?
e^x(xe^x)+e^x(e^x+xe^x)=0 ??
idk if anyone could help it would be greatly appreciated. this is the 1st problem of my hw lol ..i might have to post more if i don't get the other ones

y=x sqrt(9-x^2)
y=x^3(4-x)
y=x^1/3(x-4)
y=x^1/2(x+3)

i absolutely have no idea how to do these -_- if anyone could help me step by step?? >.<

2007-11-17 09:40:58 · 2 answers · asked by boom56 1 in Mathematics

- what is the probability of flipping a coin and landing on tails three times in a row? I wasn't sure if it's 1/2 because its independant probability or if its 1/6 doing 1/2 times 1/2 times 1/2 three times?

2007-11-17 09:40:46 · 5 answers · asked by arwww x p 1 in Mathematics

2007-11-17 09:40:10 · 7 answers · asked by Anonymous in Astronomy & Space

2007-11-17 09:38:11 · 1 answers · asked by Anonymous in Mathematics

2007-11-17 09:33:04 · 9 answers · asked by Anonymous in Zoology

Calculate the pH of a 1.00 L solution which is made up of 0.043 mol acetic acid and 0.020 mol sodium acetate. (Ka for acetic acid is 1.8x10-5.)

2007-11-17 09:29:51 · 3 answers · asked by Anonymous in Chemistry

I'm looking specifically for the Keq value (equilibrium constant) for the reaction Fe3+ + SCN- ---> FeSCN2+ at around 25C

Anyone know where I can find this out? I tried google but didn't have much luck but maybe thats just me

2007-11-17 09:27:05 · 2 answers · asked by KM 2 in Chemistry

Please explain quantum numbers! I know what each of the numbers means, but how do you identify an element based on a set of numbers. So, what does the set n=1 l=0 and m1=-1/2 tell me?

2007-11-17 09:24:44 · 2 answers · asked by Anonymous in Chemistry

2007-11-17 09:22:52 · 5 answers · asked by Paul G 1 in Mathematics

2007-11-17 09:19:15 · 4 answers · asked by Anonymous in Physics

When a human embryo consists of not more than 64 cells, its cells are, like a young dog, able to learn new tricks. If injected into a diseased kidney, they take on many of the properties of ordinary kidney cells, and may help the kidney to perform its normal function. This seems to hold for any organ, even any kind of cell. .

2007-11-17 09:17:14 · 5 answers · asked by Anonymous in Biology

how do you differentiate

y= log 5x ?

2007-11-17 09:16:30 · 2 answers · asked by Anonymous in Mathematics

How much would the total be if a jacket was $40 and there was a 10% off sale?

2007-11-17 09:10:42 · 5 answers · asked by Anonymous in Mathematics

2007-11-17 09:10:01 · 3 answers · asked by Anonymous in Biology

This is an integral with 0 on the bottom of it and pi/4 on top just to make sure you understand... and it needs to be evalutated

2007-11-17 09:10:00 · 5 answers · asked by Greg M 1 in Mathematics

Hi, we performed a calorimetric lab in which we did two separate experiments. In the first one we reacted Mg with HCl and in the second one we reacted MgO with HCl. We had to find out their molar enthalpies.
One of the questions are - Explain why and how your calculated enthalpies of reaction would be inaccurate if the surface of the magnesium ribbon had a coating of MgO

2007-11-17 09:08:16 · 1 answers · asked by Apoorva K 1 in Chemistry