Understanding the concepts

1. Introduction 2'46"

2. Girls and shoes (1) 6'04"

3. Girls and shoes (2) 4'45"

Calculations

1. Hydrogen and oxygen 11'34"

2. Hydrogen and nitrogen 5'04"

3. Ammonia and oxygen 8'13"

4. Exam questions 13'53"

1. Introduction 8'48"

Exam questions

1. Percentage purity: Exam questions 12'27"

2. Percentage purity: Grade 12 Exam questions 13'48"

Concentration, pH and percentage purity:

• 1. Part 1: Concentration and pH 5'02"

  2. Part 2: Percentage purity 11'17"

  3. Part 3: Overview and recap of percentage purity question 2'01"