1. Intermediate 1 Unit 1a Substances 123 4567 89 10 111213 14 15 22 2324 25 26 27 161718192021

2. Name the two elements which are liquids at room temperature. Mercury and bromine

3. Name an element which is a solid at room temperature. Iron, copper, zinc, potassium, tin, gold, silver and many others.

4. Name an element which is a gas at room temperature. Oxygen, nitrogen, fluorine, chlorine, hydrogen

5. Are there more or less metals than non-metals? There is more metals.

6. Give an example of a metal which was one of the first to be discovered Gold, silver and copper

7. Which elements show similar chemical properties? Elements in the same column

8. What is a compound? Different atoms joined together.

9. What does the ending -ide tell you about a compound? 2 elements joined together

10. What does the ending -ate/ite indicate about a compound? Oxygen is present

11. What is a mixture? Two or more substances not joined together

12. What is the percentage of nitrogen and oxygen in air? Nitrogen -80% Oxygen -20%

13. What is the test for oxygen? It relights a glowing splint

14. Why does air not give a positive test for oxygen? There is not enough oxygen in the air.

15. What is a solution? A solution is formed when a substance dissolves in a liquid.

16. What term is used to describe a substance which dissolves in a liquid? Soluble

17. What term is used to describe a substance which does not dissolves in a liquid? Insoluble

18. What is a saturated solution? A solution in which no more solid can be dissolved.

19. Which has more substance dissolved in it a concentrated or dilute solution? Concentrated

20. How is a solution diluted? Add more liquid(water)

21. Which gas is dissolved in drinks to make them fizzy? Carbon dioxide gas

22. What is the test for carbon dioxide gas? Turns limewater milky

23. Why is chlorine dissolved in drinking water? To kill bacteria(germs)

24. Why is sodium fluoride dissolved in drinking water To prevent tooth decay

25. What is the problem with lead compounds being present in drinking water? Harmful to health

26. What does this hazard warning symbol tell you? Toxic or poisonous

27. What does this hazard warning symbol tell you? Flammable / catches fire easily

28. What does this hazard warning symbol tell you? Harmful or irritant

29. Intermediate1 Unit 1a 123 4567 89 10 111213 14 15 22 23242526 27 161718192021