1. 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.

Which pen has an ink made from 4 dyes mixed together?

2. Pick a liquid that is a weak acid

3. Word equations for 4 different reactions are shown.
Which of them is an example of a neutralization reaction?

4. What does 'SYNTHETIC' mean?

5. Metal is the best material for a radiator because it

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

How many products would be formed when wax burns?

7. What colour is anhydrous cobalt chloride?

8. How is carbon dioxide made in the laboratory?

9. The best way to separate sand from iron filings is

10. Sucrose is the chemical name for which common substance?

11. You have four substances which you label A, B, C and D.
One is a mixture, one a metallic element one a non-metallic element and one a compound.

They have the following properties:

A	A yellow, crumbly solid that burns to form a single, colourless gas which turns universal indicator red.
B	A grey, malleable solid that burns to form a single, white, alkaline oxide.
C	A colourless liquid. The liquid is warmed in a shallow dish and after a few minutes a white residue is seen.
D	A green solid that decomposes when heated to form a colourless gas and leave a black powder.

Which of the substances is likely to be a metallic element ?

12. The substance found in pencil 'leads' is made from

13. Pick an acidic oxide from the list

14. Which of the below is a fossil fuel?

15. What colour would Universal Indcator turn when added to a strong alkali?

16. Look at the graph below which shows the solubility of 3 substances in water at diferent temperatures
Which substance does the temperature of the water have the least effect on the solubility?

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

18. A boy dissolved some salt in warm water. What do we call the resulting mixture?

19. 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

 

What is the magnesium reacting with?
 

20. What percentage of the air is nitrogen (approximately)?