REDOX AS

Question 1

What does reduction mean

Answer 1

Gaining of electrons, loss of oxygen.

Question 2

What does oxidation mean

Answer 2

Loss of electrons, gain of oxygen

Question 3

What is the oxidation state of oxygen when it is bonded to Fluorine

Answer 3

+2

Question 4

What is the oxidation state of oxygen in H202 (peroxide)

Answer 4

-1

Question 5

What are the oxidation states of group 1,2 and 7 (halides)

Answer 5

1=+1
2=+2
7=-1

Question 6

What is the overall charge of a neutral compound

Answer 6

0 (everything in that compound must add to 0)

Question 7

What is the overall charge in a polyatomic ion

Answer 7

The charge eg +1,+2,-1,-2

Question 8

How do you find oxidation states in a polyatomic ion

Answer 8

All oxidation states must add to the charge of the ion

Question 9

What is an oxidising agent

Answer 9

Causes something else to be OXIDISED
It accepts (gains) electrons
It gets reduced

Question 10

What is a reducing agent

Answer 10

Causes something to be reduced
It donates (loses electrons)
It gets oxidised

Question 11

What are the steps for writing half equations

Answer 11

1. write what you know (reactants + products)
2. Balance for atoms (not O or H)
3. Balance for O using H20
4. Balance for H by adding H+ ions
5. Balance charge by adding e- to the side with the higher charge

Question 12

What is the oxidation state of a hydride

Answer 12

-1

Question 13

What is usually the oxidation state of oxygen

Answer 13

-2

Question 14

Oxidation state of hydrogen

Answer 14

+1

Question 15

What are agents always

Answer 15

Reactants

Question 16

What is disproportionation

Answer 16

When a species has been both oxidised and reduced simultaneously in a chemical reaction.