Chemistry - May 2007

help! i absolutely dont get this...i have to fill in this chart.


Cell voltage
as measured
on voltmeter
_____________________________________________
current from
(name oxidized
metal)
__________________________________________
current to
(name reduced
ion
_____________________________________________
Standard electrode
potential for
oxidized metal
___________________________________________
standard electrode
potential for
reduced ion
__________________________________________
calculate cell
potential
____________________________________________
error
_________________________________________



for these pairs of half cells:
Zn / Zn +2 || Cu / Cu +2
Zn / Zn +2 || Mg / Mg +2
Cu / Cu +2 || Mg / Mg +2

2007-05-22 18:33:45 · 1 answers · asked by BUM 2

write a balance equation for the production of methane from hydrogen and carbon

2007-05-22 18:33:22 · 3 answers · asked by matthew j 1

the more food you deep fried, the blacker it gets. In addition, it also make the food that is deep fried unhealthy. WHY??? Thanks for answering.

2007-05-22 17:52:21 · 4 answers · asked by Anonymous

2007-05-22 17:51:02 · 1 answers · asked by Anonymous

The solubility of calcium chloride in water at 20degreesC is 26.7g/100mL. Calculate its molarity.

2007-05-22 17:49:57 · 3 answers · asked by pirateprincess 2

2007-05-22 17:28:15 · 3 answers · asked by erika 1

2007-05-22 17:09:22 · 2 answers · asked by LOL 1

If 4.25g of a diatomic gas is stored in 2.0L container at a temperature of 22degree C and a pressure of 10.8psi, what is the identity of the gas?

2007-05-22 17:08:40 · 1 answers · asked by Anonymous

2007-05-22 17:00:12 · 3 answers · asked by josephrcn 1

2007-05-22 15:41:03 · 1 answers · asked by ibid 3

What foods is phosphorus found in?

2007-05-22 13:55:25 · 3 answers · asked by Anonymous

2007-05-22 13:53:42 · 1 answers · asked by Nowatorski 2

Sodium azide, NaN3(s), is used to inflate airbags. On impact, the sodium azide is ignited by an electrical spark producing nitrogen gas and solid sodium. The Nitrogen gas inflates the airbag.

1. Using the information above, write a blanced reaction using the smallest whole number coefficient and physical state of each chemical.

2. In terms of atoms, what type of reaction is described above?

3. What is the total number of moles present in a 130g sample of NaN3(s)

4. Assuming all of the sodium azide reactants, how many grams of solid sodium are produced?

5. An inflated airbag has a volume of 5.00 x 10^4 cm^3 at STP. The density of nitrogen gas at STP is 0.00125 g/cm^3. What is the total number of molecules of nitrogen gas in the airbag.

Thanks!

2007-05-22 13:42:13 · 2 answers · asked by Bowler 1

how much water would I need to add to 20.0mL of 2.0M NaCl to make a 0.10 M solution?

2007-05-22 13:33:09 · 4 answers · asked by jumba 1

2007-05-22 13:27:34 · 7 answers · asked by ..Whiteboy52386.. 1

2007-05-22 13:26:25 · 2 answers · asked by Steven Perry_1990 2

What is a coefficient ? Why are they important ? What do they tell us ?

2007-05-22 13:22:41 · 4 answers · asked by Anonymous

2007-05-22 13:18:36 · 1 answers · asked by Nowatorski 2

How can radiation get into large amounts of water and what are the bad effects it can do to a person?

2007-05-22 13:09:33 · 1 answers · asked by Anonymous

We're doing this qualification lab in chemistry, where we have to identify an unknown substance...and let me tell you. I AM STUMPED!

I have a silver like substance that kind of looks like glitter

When I added distilled water to it, it turned a forest green color.
(It's an acid)

WHen I ran a flame test, it resulted in a teal & green flame.

On the 18 M SUlfuric acid, a brown gas was produced.

On the Sodium Hydroxide prelimanary test, a teal and blue precipitate was formed.

An EXTREME clorine smell was smelled sometime during the process of these tests.

My teacher said it was not the following:
Barium Chloride.
A Nitrate

Please help me!

2007-05-22 13:07:34 · 2 answers · asked by Rebecca 3

2H2(g)+O2(g)>>>2H2O(L) potential energy diagram for both of these formulas

2007-05-22 13:04:45 · 2 answers · asked by Anonymous

I need help finding the net ionic equations for three reactions

1) KIO3 + Na2S
2) KIO3 + NH4Cl
3) KIO3 + AgNO3

Any help/explanation would be much appreciated. Thanks so much!

2007-05-22 12:59:10 · 1 answers · asked by bkswimgurl 1

What molarity of acid would result if i added 200mL of distilled water to 25.0mL of 12 M HCl?

2007-05-22 12:04:57 · 3 answers · asked by jumba 1

2007-05-22 11:53:20 · 4 answers · asked by Roo 1

A common Isotope of Carbon has a mass number of 13. How many Total subatomic particles are in the nucleus?

2007-05-22 11:52:05 · 3 answers · asked by Anonymous

CHEM HELP!!! =]

2007-05-22 11:51:40 · 1 answers · asked by Anonymous

help

2007-05-22 11:48:26 · 1 answers · asked by Alex 1

how would you calculate the molar mass of a base given the molarity and a titration curve?? (equivalence point at 25mL)??thnx!

also, after the Ka is known, how would you calculate the pH at the equivalence point??

thanks!

2007-05-22 11:48:12 · 1 answers · asked by Nicole S 1

PV=nRT

2007-05-22 11:37:04 · 6 answers · asked by Anonymous

The chalococite (CuFeS2) is broken down into Iron (II) sulfide with the help of oxygen gas to produce two products one being sulfur dioxide gas. Write a chemical equation breaking down the ions of each compound (showing all charges). Write a second balanced equation with phase labels that occurs in this process. Then, identify the type of chemical reaction supported by reason.

To help me understand would you kindly show work or explain it to me. Thank you :P and sorry for eating

2007-05-22 11:36:07 · 2 answers · asked by ?-? 1