Chemistry · May / June 2022 · Paper 62 · Question 1
0620
As printed in the paper
The question as text
Sodium hydrogencarbonate decomposes when heated. The products are solid sodium carbonate, water and carbon dioxide. A student decomposed a sample of sodium hydrogencarbonate using the apparatus shown. sodium hydrogencarbonate delivery tube water A X B
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
1(a)[2]
A boiling tube / test-tube
B measuring cylinder
1(b)[1]
water / H2O
1(c)[1]
arrow to show heating must have head pointing towards the tube and the arrowhead must be between the two lines shown
1(d)[1]
no more bubbles / volume of gas stops changing
1(e)[2]
test-tube / boiling tube breaks / cracks
suck back / water goes into tube
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