Redox 182-183

Question 1

Define oxidation

Answer 1

Oxidation is loss of electrons, or an increase in oxidation number.

Question 2

Define reduction.

Answer 2

Reduction is gain of electrons, or a decrease in oxidation number.

Question 3

If reduction occurs in a reaction, what else occurs?

Answer 3

oxidation

Question 4

Briefly explain how to calculate a redox equation knowing to half-equations.

Answer 4

• Multiply both reactions by factors so that they both have the same number of electrons. Then add the two equations together. The electrons should then cancel out.

Question 5

What can be added to redox reaction equations if everything does not completely balance?

Answer 5

• If the reaction has been carried out in acid conditions, then simply add the number of H+ ions that you need.
• For alkaline conditions, you can add OH-
• If ‘H’ and ‘O’ need to be added, think ‘H₂O’