Chemistry · May / June 2022 · Paper 61 · Question 1
0620
As printed in the paper
The question as text
The apparatus in the diagram was used to show that when a candle is burned both water and carbon dioxide are formed. The gases produced when the candle burns are passed through the apparatus using a suction pump. solution Z X W liquid water ice candle U-tube to suction pump
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
1(a)[2]
W (filter) funnel
X test-tube / boiling tube
1(b)[1]
to cool (the steam to form water) / to turn steam to water / to condense (the steam) / so water condenses
1(c)[1]
measure boiling point = 100 (°C)
or
measure freezing point = 0 (°C)
1(d)[1]
limewater / calcium hydroxide (solution)
1(e)[1]
contains carbon or hydrogen
1(f)[2]
use (acidified) potassium manganate(VII)
changes from purple to colourless
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