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9701/43

Chemistry 9701/43 — May/June 2016

Cambridge A-Level · A Level Structured Questions · worked solutions for every part, with the mark scheme

10
questions
100
marks
120
minutes

Topics Transition Elements · Equilibria · Carboxylic Acids and Derivatives · Nitrogen Compounds · Chemical Energetics · Electrochemistry · +6 more

Q1Group 2Free sample
(a)

Limewater is a saturated solution of Ca(OH)2\text{Ca(OH)}_2 in water. It is used to test for the presence of CO2\text{CO}_2 in a gaseous mixture.

(i)

Write an equation for the reaction between limewater and CO2\text{CO}_2.

1M
(ii)

A saturated solution of Ba(OH)2\text{Ba(OH)}_2 can be used instead of Ca(OH)2\text{Ca(OH)}_2 to test for CO2\text{CO}_2. A saturated solution of Mg(OH)2\text{Mg(OH)}_2 cannot be used for this test.

Explain why a saturated solution of Ba(OH)2\text{Ba(OH)}_2 can be used to test for CO2\text{CO}_2.

1M
(iii)

Explain why a saturated solution of Mg(OH)2\text{Mg(OH)}_2 cannot be used to test for CO2\text{CO}_2.

2M
(b)

Describe and explain the trend in the thermal stabilities of the carbonates down Group 2.

3M
(c)

Nickel carbonate, NiCO3\text{NiCO}_3, decomposes on heating.

Use the Data Booklet to explain whether NiCO3\text{NiCO}_3 will decompose more or less readily than CaCO3\text{CaCO}_3.

2M

The rest of this paper

9 more questions
  • Q2Transition Elements9M
  • Q3Equilibria · Chemical Energetics10M
  • Q4Electrochemistry8M
  • Q5Equilibria · Carboxylic Acids and Derivatives9M
  • Q6Electrochemistry · Nitrogen Compounds · Equilibria · Hydroxy Compounds13M
  • Q7Nitrogen Compounds13M
  • Q8Chemical Energetics · Transition Elements7M
  • Q9Organic Synthesis · Hydrocarbons · Carboxylic Acids and Derivatives · Halogen Compounds9M
  • Q10Transition Elements · Carboxylic Acids and Derivatives · Nitrogen Compounds · Analytical Techniques13M
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