Oxidation and reduction

Question 1

When does oxidation occur?

Answer 1

oxygen is added
hydrogen is removed
increase in valency

Question 2

When does reduction occur?

Answer 2

Oxygen is removed
hydrogen is added
Decrease in valency

Question 3

what is an oxidising agent

Answer 3

the subsatnce that is reduced, helps oxidation to happen

Question 4

what is a reducing agent

Answer 4

The substance that is oxidised is the reducing agent, helps reduction happen.

Question 5

what is an oxidation number?

Answer 5

The charge an atom has or appears to have when assigned according to a set of manmade rules.

Question 6

What are the 7 rules of oxidation numbers?

Answer 6

1.
2.
3.
4.
5.
6.
7.

Question 7

what does increase in oxidation numbers?

Answer 7

Oxidation

Question 8

what is a decrease in oxidation numbers?

Answer 8

Reduction

Question 9

2008 Define oxidation in terms of 1.electron transfer
2. change in oxidation number

Answer 9

oxidation is the loss of electons
Oxidation is the increase of oxidation number

Question 10

2007. How does oxidation number of the oxidising agent change during a redox reaction?
      Why does the oxidiising ability of the halogens decrease going dowwn the group?

Answer 10

1. Decrease in oxidation number
2. Decreasing electronegativity

Question 11

2006. Define oxidation in terms of change in oxidation number

Answer 11

Oxidation is the increase in oxidation number