1. Which would be the best substance to neutralize some spilt hydrochloric acid?

2. SALTY WATER is best described as....

3. Wax is a compound of hydrogen and carbon (known as hydrocarbon).

How many products would be formed when wax burns?

4. Some copper foil is heated in a sealed test tube until the copper stops changing colour.
What colour does the copper become?

5. Copper, iron, gold, and aluminium are all examples of what?

6. About 20cm of magnesium ribbon is chopped up into 1cm lengths and placed in a crucible which is then weighed along with its lid.
The crucible is heated strongly and the lid gently raised avery few seconds.

When the reaction is over the crucible + contents + lid are all re-weighed

These are his results:

• Mass of empty crucible + lid  = 51.2g
• Mass of crucible + lid + magnesium (before heating) = 54.3g
• Mass of crucible + lid + contents (after heating) = 54.7g

 

Did the magnesium gain mass, loose mass or not change in mass?
 

7. Crude oil can be separated into different substances using what method of separation?

8. What colour is copper carbonate?

9. If a gardener wished to make his soil less acid, which of the following would be the best to do?

10. A liquid with a pH of 9 would be described as .....

11. What colour would Universal Indcator turn when added to a weak acid?

12. Peter has three coloured felt pens which he labelled A, B and C.
He used the apparatus below to separate the dyes used to make colours from each of the pens.

What is the name of the process being carried out? 

13. A window is made out of glass because glass is

14. The best way to remove sand from water is

15. Name a neutral liquid

16. What is the normal boiling point of water?

17. Name a substance with a pH value more than pH7

18. What percentage of the air is oxygen (approximately)?

19. Kitchen cooking foil is made out of which substance

20. What is NOT true about air