1. Intermediate 1 Unit 2 Batteries & Personal Needs 123 4567 89 10 111213 14 15 22 23242526 27 161718192021

2. How is electricity produced in a battery? Chemicals react

3. Why do batteries go flat? The chemicals are used up.The chemical reaction stops.

4. Give an example of a rechargeable battery. Car battery (lead-acid battery)

5. What is the purpose of the ion solution? To complete the circuit

6. How is the voltage related to the reactivity of the metals connected in the cell? (Use data booklet) The further away from each other in the reactivity series the higher the voltage.

7. Which cell will have the highest voltage - a magnesium/zinc cell or a magnesium /copper cell? Magnesium/copper cell.

8. Why is soap needed to clean oil and grease off clothes, skin and hair. Oil and grease are insoluble in water

9. How are cleaning chemicals able to break up the oil and grease which can then mix with water? They are soluble in both water and oil/grease.

10. Give an example of a cleaning chemical. Soap, detergents, shampoo, washing-up liquids and powders.

11. What type of detergent is used to form a lather with hard water? A soapless detergent

12. What is formed when some soaps are used with hard water? A scum

13. What is special about the solvents used in dry-cleaning? They are very good at dissolving oil and grease stains.

14. What are the thin strands called which are used to make clothing fabrics? Fibres

15. What do natural fibres come from? Plants and animals

16. What type of fibres are made by the chemical industry? Synthetic fibres

17. Give three examples of a natural fibre? Wool, silk, cotton

18. Name two synthetic fibres. Nylon and polyester

19. What are the long chain molecules which make up a fibre called? Polymers

20. What are dyes used for? To give bright colours to clothing

21. Some fibres are hard to drip dry. Do these fibres form strong or weak bonds with water? Strong bonds

22. Why do some fibres not feel sweaty to wear? They soak up perspiration

23. A cell is made by connecting zinc metal and copper metal in a solution. What would happen to the voltage of the cell if the zinc was replaced with tin ? It would go down

24. A cell is made by connecting zinc metal and copper metal in a solution. What would happen to the voltage of the cell if the copper was replaced with silver ? It would go up.

25. Give an advantage of using batteries rather than mains electricity. Batteries are portable

26. Give a disadvantage of using batteries rather than mains electricity. They run out. They are more expensive than mains electricity.

27. Why are some fabrics flameproofed? To stop them catching fire easily

28. Name the type of battery used in a car? Lead-acid battery

29. Intermediate 1 Unit 2 123 4567 89 10 111213 14 15 22 23242526 27 161718192021