1. What gas is produced when calcium carbonate is added to dilute hydrochloric acid?

2. Jane has two bowls on her bench.
One contains fine brown sugar. The other contains sand.
To find out which was which she stirred each into some warm water. Which will dissolve?

3. Which of the properties of water listed below is NOT correct

4. What solid is formed when limestone is heated?

5. What colour will universal turn when mixed with water?

6. What is the test for oxygen gas?

7. Four different substances are added to dilute sulphuric acid
Which of the substances would produce no reaction?

8. What is the name of the piece of apparatus shown?

9. 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 a white ash could be seen in the crucible.
The crucible + ash + 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 name of the white ash that remains in the crucible after the experiment 

10. This apparatus is being used to collect the water produced when copper sulphate is heated.

Why is it an importeant saftety requirement not to let the open end of the delivery tube touch any water in the beaker or test tube?

11. Look at the graph below which shows the solubility of 3 substances in water at diferent temperatures
How is the solubility of substance B effected by temperature?

12. The metal inside an electric wire is normally made out of....

13. What colour would Universal Indcator turn when added to a mild alkali?

14. What will iodine do when heated in an open test tube?

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

16. Put the following processes into the correct order if you wished to obtain pure salt from rock salt

17. A liquid with a pH of 2 would be described as .....

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. When crystals of copper sulphate are heated strongly in a test tube they