AQA GCSE Chemistry (8462) · AQA 8462
4.5 Energy changes
Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).
Practice questions on Energy changes
- A hand warmer is used by a person on a cold day. When the hand warmer is activated, it rel… (4 marks, Explain)
- When a cold pack is applied to a sports injury, a chemical reaction occurs inside the pack… (4 marks, Explain)
- When a self-heating can of coffee is activated, a chemical reaction occurs inside the can.… (4 marks, Explain)
- A hydrogen fuel cell uses hydrogen and oxygen to produce a potential difference. Describe … (4 marks, Describe)
- Compare rechargeable cells and non-rechargeable cells. Include in your answer how each typ… (4 marks, Compare)
- Explain why a non-rechargeable alkaline battery must be replaced once it stops working, bu… (4 marks, Explain)
- Explain why the voltage produced by a chemical cell depends on the type of chemicals used … (4 marks, Explain)
- Evaluate the use of hydrogen fuel cells compared to alkaline batteries as sources of elect… (4 marks, Evaluate)
- When magnesium burns in oxygen, combustion occurs and a white powder is produced. Explain,… (4 marks, Explain)
- A student mixes citric acid and sodium hydrogencarbonate in a beaker. The temperature of t… (4 marks, Explain)