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1. What is a chemical reaction? (lesson 22a)
2. What is the product of this reaction: carbon + oxygen --> carbon dioxide. (22a)
3. If iron oxide is reduced what do you get? (22b)
4. In industry iron oxide is reduced in a ----- -------. (22b)
5. What 3 things make up the fire triangle? (22c)
6. What do you call a reaction where a substance has gained oxygen? (22c)
7. ------------ is when yeast turns sugar into alcohol. (22d)
8. What gas is given off in the reaction in question 7? (22d)
9. What do you need for iron to go rusty? (22e)
10. Which metal is used to galvanise iron? Why is it a good way to protect iron? (22e)
11. A concentrated solution will react ------ than a dilute solution. (22f)
12. What gas is given off when limestone reacts with acid? (22g)
13. Limestone and acid are put in a flask on a balance. What happens to the reading on the balance? (22g)
14. What is a catalyst? (22h)
15. What do you call biological catalysts? (22h)

ANSWERS

1. A change which makes a new substance or substances.
2. carbon dioxide.
3. Iron.
4. Blast furnace.
5. Fuel, oxygen, heat.
6. Oxidation.
7. Fermentation.
8. Carbon dioxide.
9. Air and water.
10. Zinc, because it protects the iron even when scratched.
11. Faster.
12. Carbon dioxide.
13. They decrease.
14. A substance which changes the rate of a chemical reaction without being used up itself.
15. Enzymes.