Chemistry Reference
In-Depth Information
c
Give a chemical test to show the presence of
water.
test ______
result ______
21
Ethene gas was formed by the cracking of a liquid
alkane. The diagram shows the apparatus used.
liquid alkane
on mineral
fibre
[2]
aluminium
oxide
d
What would be the effect of touching the
alcohol with a lighted splint? [1]
[Total: 7]
(Cambridge IGCSE Chemistry 0620 Paper 06
Q7 June 2008)
ethene
very strong
heat
20
The colours present in some blackcurrant sweets
can be separated by chromatography. The colours
are water-soluble dyes. The diagrams show how
the colours can be extracted from the sweets.
a
Identify two mistakes in the diagram. [2]
b
Describe a test to show the presence of ethene.
test ______
result ______ [2]
[Total: 4]
(Cambridge IGCSE Chemistry 0620 Paper 06
Q3 November 2008)
22
An experiment was carried out to determine
the solubility of potassium chlorate at different
temperatures. The solubility is the mass of
potassium chlorate that dissolves in 100 g of
water. The results obtained are shown in the
table below.
a
Complete the empty boxes to name the pieces
of apparatus.
[3]
The apparatus below was used to carry out the
chromatography.
Temperature/°C
0 10 20 30 40 50 60
Solubility in g/100 g water
12 17 20 24 29 34 40
a
On the grid, draw a smooth line graph to show
the solubility of potassium chlorate at different
temperatures.
glass cover
[4]
beaker
50
chromatography
paper
solvent
40
30
20
b (i)
Name the solvent used.
[1]
(ii)
Label, with an arrow, the origin on the
diagram.
[1]
10
c
Sketch the chromatogram you would expect
if two different colours were present in the
sweets.
0
[1]
[Total: 6]
(Cambridge IGCSE Chemistry 0620 Paper 06
Q1 November 2008)
0
10
20
30
40
50
60
70
temperature / °C
