Chemistry - April 2007

a. 24Mg

b. 27Mg2+

c. 56Co2+

d. 59Co3+

e. 61Co

f. 56Fe

g. 58Fe2+

h. 39K

i. 40Ca2+

j. 41Ca

2007-04-04 08:47:57 · 3 answers · asked by Jordyn N 2

Could someone explain Endothermic vs. Exothermic reactions to me please?

What are reversible reactions?

What's a dynamic equilibrium?

And how do you read the pH scale?

2007-04-04 08:46:09 · 2 answers · asked by ocean_dreamer550 1

2007-04-04 08:43:59 · 6 answers · asked by Keshia M 1

1. Why is mol significant to Chemistry?

2. What is Boyle's Law?

3. What is Charle's Law?

4. What is the Ideal Gas Equation?

5. What does 1 mol equate to?


Simple questions, I think. Thanks in advance!

2007-04-04 08:39:38 · 3 answers · asked by ocean_dreamer550 1

identify the molecular formula, mercury (I) sulfide

2007-04-04 08:33:24 · 3 answers · asked by Auby nobby 1

What concentration of Ag+ is present in the folllowing electrochemical cell if E=-0.683V and E^o (Ag+)=+0.799V at 25 degrees Celsius?

Ag |Ag+(?M) || H+(1.0M) |H2(1.0atm)| Pt

2007-04-04 08:33:21 · 1 answers · asked by Anonymous

in the following cell:
left side: SO^2- and Zn^2+ in the solution, Zn bar
right side：same as left side
Zn bars are connected, 2 compartments total (left and right）
In this cell, one of the compartments has a concentration of Zn2+ = 1.00M.
For the next three questions, calculate the cell potential (V) at 25.0 C for the given concentrations of Zn2+ in the other compartment. Numeric answers.
1) 1.30 M
2) 3.00 x 10−5 M
3) 1.00 M

2007-04-04 08:29:44 · 1 answers · asked by owaifkahlfkjh 2

make the hydrogen bonding possible?

2007-04-04 08:28:43 · 1 answers · asked by dem boyz 2

2007-04-04 08:11:30 · 7 answers · asked by Auby nobby 1

if you add water in dry ice and let it inflate for a couple of minute, and then force out all the carbon dioxide, does the presence of water vapor affect the mass of CO2?

2007-04-04 07:55:27 · 2 answers · asked by Djoanna Maria T 1

You can have one atom of _____.
A) iron oxide

B) krypton

C) water

D) carbon monoxide

2007-04-04 07:55:03 · 4 answers · asked by Anonymous

a. H2O
b. 0.5 M HI
c. 0.2 M HI
d. 1.0 M HNO3
e. 0.8 M KI

2007-04-04 07:49:04 · 1 answers · asked by Anonymous

2007-04-04 07:44:31 · 3 answers · asked by Anonymous

2007-04-04 07:40:07 · 4 answers · asked by jacah5 3

Also, how do I write the equilibrium expression for this reaction?

2007-04-04 07:37:05 · 1 answers · asked by Random G 3

a. all orbits of n=4
b. all of the 4f orbitals
c. all of the 5g orbitals

2007-04-04 07:35:32 · 1 answers · asked by j 2

i think it has somethin to do with the fact that the Cl- is from a strong acid (HCl) so the result is a weak base so the pH is around 7.5 but i dont know how to use an equation.

2007-04-04 07:24:47 · 1 answers · asked by xo_cristina_xo 1

http://www.unitednuclear.com/negx.htm < how long will this mix take to catch on fire on its own. just curious

2007-04-04 07:18:57 · 1 answers · asked by .~`A88H`~. 1

chlorine, flourine, helium, nitrogen

please explain

2007-04-04 06:50:18 · 5 answers · asked by BOO 1

2007-04-04 06:30:33 · 3 answers · asked by Anonymous

2007-04-04 06:01:38 · 2 answers · asked by Anonymous

Lithium (Li) has three ______.

A) protons

B) molecules

help please
love you guys thanks!!!!

2007-04-04 05:57:03 · 7 answers · asked by Anonymous

Using your tire gauge you read a pressure of 30.0 psig. It's about 10.0 degrees celsius outside. You drive to class. When you arrive you check the pressure again and it now reads 35.0 psig. By how many degrees celsius did the drive to class increase the temperature of the air in your tire?

2007-04-04 05:37:05 · 3 answers · asked by pcleader06 1

Al3+ is reduced to Al(s) at an electrode surface. If a current of 25 amperes is maintained for 8 hours, what mass of aluminum is deposited on the electrode? Assume 100% efficiency.

I know that the correct answer is 67 grams, however I don't understand why. I am working on my own calculation but I'm getting 8.39g

2007-04-04 05:12:09 · 2 answers · asked by Anonymous

lowest ph and highest ph? i need thiss quickly please

2007-04-04 05:11:05 · 2 answers · asked by Anonymous

2007-04-04 05:05:13 · 3 answers · asked by Anonymous

2007-04-04 04:29:24 · 2 answers · asked by darknlovely387 1

2007-04-04 03:37:27 · 1 answers · asked by drtrramseur 1

i want to prepare a non hazardous solution of phosphorus at home to add oil paints to paint glow in the dark pictures. i am not a chemist so i need detailed and clear info about this. and what is the formula for balmain's paint, where can i buy it and can i add it to oil paints. thanks.

2007-04-04 03:22:07 · 2 answers · asked by wisehard 2

2007-04-04 03:05:20 · 4 answers · asked by Peter M 1