PLEASE HELP ME chemistry / physics problem?

Question

1. rewrite the fallowing equation so its reversable

CaO ---> Ca ^2+ + 2 OH-

2. ocean water A. is highly acidic B. releases large amounts of disolved CO2 C. neutralizes carbonic acid

3. if substance A is reduced by substance B substance B is acting as A. a reducing agent B. an oxidizing agent C.a salt

D. none of these

4. when substance A is reduced by substance B, what happens to substance B? substance A acts on substance B as A. a reducing agent B.an oxidizing agent C. a salt D. none of these

Answer 1

1. rewrite the fallowing equation so its reversable

CaO ---> Ca ^2+ + 2 OH-

Ca(OH)2 (s) <--> Ca +2  & 2 OH-

2. Surface oceans currently have an average pH of 8.2.

http://www.rsc.org/chemistryworld/News/2...

your answer is:C. neutralizes carbonic acid

3. if substance A is reduced by substance B,

Your answer is:substance B is acting as A. a reducing agent

4. when substance A is reduced by substance B, what happens to substance B?

substance A acts on substance B as

Your answer is: B.an oxidizing agent