Chemistry - January 2007

These are the equations I am having troble writing as ionic and net ionic equations.

1. NaBr + AgNO3 -- NaNO3 _ AgBr(s)

2. NiCl2 + 2KOH -- Ni(OH)2(s) + 2KCl

3. K2CrO4 + Pb(NO3)2 --PbCrO4(s) + 2KNO3

4. 3BaCl2 + Al2(SO4)3 --3BaSO4(s) + 2Alcl3

5. AgNO3 + Kl -- Agl(s) + KNO3

6. 2HCl + Ca(OH)2 -- H2O + CaCl2

Please help thanks!

2007-01-05 07:07:56 · 3 answers · asked by jlbtsmith 1

I don't rememebr anything from chemistry. How can I relearn everything?

2007-01-05 07:06:38 · 4 answers · asked by Duckie 2

Explain why lead can be used for this purpose but mercury cannot?

2007-01-05 07:03:55 · 10 answers · asked by :) Anfield 2

water
hydrogen peroixde
isopropyl alcohol
saline solution
aspirin
pepto-bismol
alka-seltzer
tonic water
vinegar

thanks

also, does anyone know anything about the chemistry of taste?

2007-01-05 06:43:09 · 3 answers · asked by nice too meet you. 4

2007-01-05 06:36:27 · 7 answers · asked by love and peace 1

(Note: This reaction takes place in an acidic solution.)

Step 1: What substance is reduced? NO

Step 2: What substance is oxidized? Ag

Step 3: What is the half reaction for oxidation?

Step 4: What is the half reaction for reduction?

Step 5: What is the net balanced equation?

Step 6: What is the reduced equation?

2007-01-05 06:34:10 · 2 answers · asked by pfc_san_souci 1

2007-01-05 06:20:24 · 4 answers · asked by :) Anfield 2

2007-01-05 06:18:49 · 7 answers · asked by :) Anfield 2

a. Thorium-234--->Proactinium-234 + -1

b. Hydrogen + Hydrogen ---> Helium

c. Uranium-238--->Thorium-234 + Helium-4

2007-01-05 06:05:11 · 3 answers · asked by Anonymous

2007-01-05 05:50:07 · 3 answers · asked by southern_beauty3 1

I have a problem with an elderly relative who could be harmed by ingesting products containing alcohol, obviously we will try to make sure no dangerous substances are around but we wondered if this meant that alcohol was removed ? (Please note this is a serious question, no jokes or abuse please ! ) Thanks !

2007-01-05 05:46:41 · 12 answers · asked by sean 1

2007-01-05 05:28:03 · 8 answers · asked by Help 1

I have several 10 kg tanks and am not using them and I am wondering if they will ever go bad?

2007-01-05 04:53:10 · 5 answers · asked by Anonymous

THe questions are:
Determine the concentration, Molarity, of Potassium iodide solutionwhere 30.0 mL f the Iodide solution was needed to react completely with 10.0 mL of 0.10M dichromate solution. The balances equation is given below: 3I(-) + Cr2O7(-2) + 14H(+) yields 3I2 + 7H20 +2Cr(+3) and
A 0.0621 M KMnO4 solution was used to titrate a solution containing CaC2O4. If 22.76mL of KMnO4 solution was required to reach the titration endpoint, calculate the number of grams of CaC2O4 in the sample. With the eq: MnO4(-) +C2O4(2-) yields Mn(2+) + CO2

2007-01-05 04:20:47 · 3 answers · asked by Chris F 1

5: The formula for nitrogen pentoxide is
NO2
N2O
N2O3
N2O5


6: The formula of sodium sulfite is
Na2S
Na2SO2
Na2SO3
Na2SO4


9: The formula for potassium sulfide is
K2S
KHSO3
K2SO3
K2SO4


16: The valence of aluminum is +3. The formula of aluminum sulfate is
Al2S3
AlSO4
Al2(SO4)3
Al2SO


18: The only common radical which has a positive valence is
SO4
NO3
NH4
CrO4


19: In the compound KClO3 the total negative valence is
-2
-4
-3
-6

2007-01-05 04:14:24 · 6 answers · asked by Amber Elizabeth 1

If i have O and O^2-, which has a larger atomic radius, and why, is it shielding, energy level, or nuclear charge, i think shielding and nuclear chrage, but im really not sure

another example Ca, or Ca^2+

2007-01-05 04:02:51 · 2 answers · asked by Anonymous

How may I make a thin (10*30*0.02cm) ceramic sheet of armor quality Boron Carbide for my chemistry project to make a gient lattice structure of choice. This is very important and tell it to me at go_surangasa@yahoo.com

2007-01-05 03:31:33 · 1 answers · asked by Anonymous

2007-01-05 03:31:15 · 5 answers · asked by Anonymous

2007-01-05 03:21:59 · 6 answers · asked by CoNfUsEd 2

I need you help. I am trying to my Chemistry PPA in scotland.

The effect of Concentration Changes on Reaction rate.

By adding ameasured amount of water to the potassium iodide while keeping the total volume of the mixture the same.
ie. 1st : 100%potassium iodide (25cm cubed) + no water
2nd : 80% potassium iodide (20cm cubed) + 20% water (5cm cubed)
All other factors had to be kept constant in volume and concentration (1mol-1 sulphuric acid, 0.1 mol-1 hydrogen peroxide, 0.005 mol-1 sodium thiosulphate) also temperture.

Then we woek out the rate of reaction by doing a stop clock thing where we watch for it turnign black, and the dividing 1 by time. Draw a graphVolume of KI (cm cubed) against Rate s-1

anyway to the point WHAT IS THE CONCLUSUION OF THIS EXPERIMENT. I JUST DONT KNOW

2007-01-05 02:56:23 · 5 answers · asked by Anonymous

2007-01-05 02:49:25 · 7 answers · asked by love and peace 1

A solution with I- and a sour solution with Cr2O72- is mixed. Cr3+ and I is the result of this. What is the formula for this reaction?

I basically don't know how to balance it.. The unbalanced thing I presume is Cr2O72- + Cr3+ --> I + Cr3+. Then, I'm lost!

2007-01-05 02:41:25 · 4 answers · asked by Anonymous

2007-01-05 02:34:16 · 2 answers · asked by Anonymous

I posted this in the wrong place, I just figured out what I'm doing, sorry. So here is is again.

This is a good one. There are several of us that are inflicted with the dreaded Sulfur Burps, we have gotten together here at yahoo to try to find an answer, the Dr's think we are crazy and tell us it will go away, don't worry about it, never heard it.

It is a very real debilitating chronic problem for many of us.

We need a biochemist to help us I think.

I have done a lot of research but since I know nothing much about Chemistry and the reaction of chemicals, I'm here.


I know that sulfur is blamed for the smell, the smell of rotten eggs. I know that the odor associated with rotten eggs is actually due to hydrogen sulfide.

I know that many metal sulfides are so insoluble that they are probably not very toxic. Some metal sulfides, when exposed to a strong mineral acid, including gastric acids, will release toxic hydrogen sulfide. How does this happen? What would cause such a reaction?

When I learned this I said, Aha.. gastric acids and metal sulfides have something to do with this, so now what is a metal sulfide? What is the correlation between Gastric Acid and Metal Sulfide?

Now, I just read something about foods that have the additive sulfur dioxide.

I know that there must be a chemical reaction going on in the stomach causing the burping smell of rotten eggs/sulfur.

People have had all sorts of tests done with no results, tried all kids of meds with no results. It's like the food in sitting in the stomach and rotting causing Hydrogen Sulfide to build to the point it explodes and that's how you feel, like you are just going to explode.

There are all sorts of speculation about it being caused by a parasite, a virus, an allergy. And I think it is a chemical reaction to things that maybe we are sensitive to. So it would be an allergy to the chemicals in certain food.

If any one can answer this question I will nominate you for chemist of the year.

Thank you for taking the time to read my post..

2007-01-05 02:33:55 · 3 answers · asked by Anonymous

I'm taking biochemistry this term and hoping to get an A in it. I need it as it's a premed requirement. I've taken a year of organic chemistry and my grades were B+, A-, and B+. Is it hard? What should I do? How should I study for it?

2007-01-05 02:32:29 · 1 answers · asked by Philippe 3

in a body of water as its temperature is increased?

2007-01-05 02:03:14 · 2 answers · asked by nargis 2

2007-01-05 01:44:46 · 1 answers · asked by popular_bond 2

2007-01-05 01:38:17 · 5 answers · asked by San Fran Kid 2

2007-01-05 01:36:48 · 10 answers · asked by divinationjones 3

I'm confused as I'm told methanol is most polar but...surely the longer the chain the more electron density to spread around and the greater the difference in + and -.

2007-01-05 01:24:26 · 4 answers · asked by loxi 2