Introduction; Unit 4. Energy and Matter: 4.1. Supplying and using energy: Multiple choice items: Heat of reaction, Galvanic cells, Electrolysis, Extended response questions: Heat of reaction, Galvanic cells, Electrolysis; 4.2. Food chemistry: Multiple choice items, Extended response questions; 4.3. The periodic table - an overview of chemistry: Multiple choice items, Extended response questions; Answers: 4.1. Supplying and using energy: Multiple choice items: Heat of reaction, Galvanic cells, Electrolysis, Extended response questions: Heat of reaction, Galvanic cells, Electrolysis; 4.2. Food chemistry: Multiple choice items, Extended response questions; 4.3. The periodic table - an overview of chemistry: Multiple choice items, Extended response questions.