Chemistry 9701/43 — May/June 2021

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

questions

100

marks

120

minutes

Topics Carboxylic Acids and Derivatives · Transition Elements · Equilibria · Electrochemistry · Hydroxy Compounds · Nitrogen Compounds · +7 more

Q1Group 2EquilibriaFree sample

(a)

The carbonates and hydroxides of Group 2 elements show similar trends in thermal stability.

Suggest and explain the variation in the trend in the thermal stability of the Group 2 hydroxides.

(b)

Calcium hydroxide is slightly soluble in water.

(i)

Write an equation to show the dissociation of calcium hydroxide, $\text{Ca(OH)}_2(\text{s})$ , in aqueous solution. Include state symbols.

(ii)

Calculate the solubility, in $\text{mol dm}^{-3}$ , of $\text{Ca(OH)}_2$ .

[ $K_{\text{sp}}$ : $\text{Ca(OH)}_2$ , $5.02 \times 10^{-6} \text{ mol}^3 \text{ dm}^{-9}$ ]

(iii)

Suggest how the solubility of $\text{Ca(OH)}_2$ in aqueous $\text{NaOH}$ compares to its solubility in water.

Explain your reasoning.

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8 more questions

Q2Transition Elements · Carboxylic Acids and Derivatives15M
Q3Transition Elements · Electrochemistry · Carboxylic Acids and Derivatives · Hydroxy Compounds · Nitrogen Compounds17M
Q4Transition Elements8M
Q5Reaction Kinetics9M
Q6Carboxylic Acids and Derivatives · Analytical Techniques · Organic Synthesis · Halogen Compounds · Polymerisation18M
Q7Organic Synthesis · Nitrogen Compounds · Introduction to A Level Organic Chemistry13M
Q8Equilibria · Electrochemistry7M
Q9Introduction to A Level Organic Chemistry · Hydroxy Compounds · Carboxylic Acids and Derivatives · Analytical Techniques6M

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