3.1.7 Oxidation, reduction + redox equations

Question 1

what is meant by ‘reducing agent’?

Answer 1

electron donors

Question 2

what is meant by ‘oxidising agent’?

Answer 2

electron acceptors

Question 3

how to balance redox equations?

Answer 3

1. balance the element
2. balance oxygen by adding water
3. balance hydrogen by adding hydrogen ions
4. check charges on both sides + add electrons to balance

Question 4

balance the following equation:
Cr2O7(2-) -> 2Cr(3+)

Answer 4

14H+ + Cr2O7(2-) + 6e -> 2Cr(3+) + 7H2O