C7.2 - Redox (flashcards to be continued)

Question 1

An oxidation reaction involves

Answer 1

gaining oxygen and/or losing electrons

Question 2

A reduction reaction involves

Answer 2

losing oxygen and/or gaining electrons

Question 3

anagram for oxidation and reduction

Answer 3

OIL RIG (oxidation is loss reduction is gain)

Question 4

Example of oxidation

Answer 4

2MGO + O2 ==> 2MGO

Question 5

Example of reduction

Answer 5

Fe2O3 + 3CO ==> 2Fe + 3CO2

Question 6

Redox reactions involve

Answer 6

a reduction and a oxidation reaction

Question 7

Example of redox reaction

Answer 7

1. CuO + Zn ==> ZnO + Cu
2. We can rewrite Cu2+ + O2- ==> Zn2+ + O2- + Cu
3. we can remove oxygen because they are spectator ions and don’t take part in the reaction
4. Cu2+ + Zn ==> Zn2+ + Cu
5. We can make two half equations
6. Cu2+ + 2e- ==> Cu and Zn ==> Zn2+ + 2e-
7. Zinc is reducing agent and copper is oxidising agent

Question 8

Iron(II) oxide (FeO) and Iron(III) oxide (Fe2O3) are

Answer 8

oxidation states which Iron(II) oxide as oxidation state of 2+ and Iron(III) oxide as 3+