1. UNIT C3 REVISION Chemistry Quiz

2. What are the two main uses for salt? A: Add colour and flavour B: Preservative and flavour C: Preservative and colour D:Preservative and catalyst

3. Why is salt ideal for helping cars grip the road? A: Salt has a lower freezing point than water B: Salt has a higher freezing point than water C: Dries the tyres of cars D: It just does

4. Why is Fish stored in salt A: keeps the fish fresh (preserves it) B: makes the fish taste better C: dries out the fish D: stops the fish from smelling

5. Why is a high-salt diet considered to be a high risk? A: lowers blood pressure B: raises blood pressure C: makes people fatter D: cause problems with vital organs

6. What happens to litmus paper if you put it in an Alkali substance? A: It does nothing B: It dissolves C:It turns pink in colour D: it turns blue in colour

7. What is a solution called it is not acidic and not alkali? A:Neutral B: pH7 C: An Avogadro's constant D:Neutralised substance

8. Which of these is NOT a use for alkalis? A: making glass B: neutralising soil C: vinegar D: making soap

9. What is formed when a metal hydroxide is reacted with hydrochloric acid (HCl)? A: Metal chloride + hydrogen B: Metal oxide + water + chlorine C: Metal chloride+ water D: Metal oxide + hydrogen

10. What is sodium hydroxide’s molecular formula? A: NaCl B: NaOH C: HNa D: SHO

11. Why is chlorine put in water? A: Purifies the water B: makes it clear C: makes it less acidic D: makes it less alkali

12. What is brine solution? A: Water and calcium chloride B: Water and sodium chloride C: Water and brine shrimp D: Water and Hydrochloric acid

13. What is electrolysis? A: electricity passing through molten salt, or a salt solution B: the mixing of Brine solution and water C: a procedure in a hospitals that sends electrical currents through parts of the brain D: extracting hydrogen from brine solution

14. What do plasticisers do? A: make plastics B: make plastics softer and more flexible C: stiffens plastics D: makes plastics flame-proof

15. What is plasticised PVC used for? A: Fake leather and wire covers B: Doors and window frames C: Pipes and gutters D: computer parts and machinery

16. How much of PVC produced is use by the building industry? A: two thirds B: half C: Quarter D: none

17. Where do positive ions go in electrolysis? A: the air B: the solution C: cathode D:anode

18. Where do negative ions go in electrolysis? A: Anode B: Cathode C: the air D: the solution

19. What is the raw material for polymers? A: castor oil B: cooking oil C: crude oil D: Bitumen

20. What happens to an acidic solution when it is mixed with alkali? A: it gets more alkali B: it neutralises C: it changes colour D: no change

21. Which of the following materials is made form plants? A: leather B: cotton C: lithium D: Mr McDermott

22. Answers B, A, A, B, D, A, C, C, B, A, B, A, B, A, A, C, A, C, B and B