1. Some plastic is bio readable.

What does biodegradable mean?

2. What gas is removed from the air when something burns?

3. Which of the gases below burns well and can be used as a fuel?

4. 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 word equation for the reaction that takes place?
 

5. A belt is made out of leather because leather is.......

6. What colour is copper sulphate?

7. 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 mixture ?

8. Which of the options below about the properties of a liquid is NOT correct

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

How many products would be formed when wax burns?

10. Which of the gases below does not burn?