Cambridge International A Level · Chemistry (9701)

The Periodic Table: chemical periodicity: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on The Periodic Table: chemical periodicity.

10 questions26 marksFree, no account

Question 1

1 mark

Which element in Period 3 has the highest melting point?

Question 2

1 mark

A solid oxide of a Period 3 element is added to water. The resulting solution has a pH of approximately 2.
Which oxide could this be?

Question 3

1 mark

An element M is in Period 3. Its oxide is insoluble in water but dissolves in both dilute hydrochloric acid and hot aqueous sodium hydroxide.
Which statement about element M is correct?

Question 4

1 mark

Which statement correctly describes the trend in atomic radius across Period 3 from sodium to chlorine?

Question 5

1 mark

What are the maximum oxidation numbers of the elements magnesium, aluminum, and sulfur in their respective oxides?

Question 6

2 marks

State the variation in the maximum oxidation number of the Period 3 elements from sodium to sulfur in their oxides.

Write your answer out first, then check it against the worked solution.

Question 7

4 marks

Explain why silicon has a much higher melting point than phosphorus.

Write your answer out first, then check it against the worked solution.

Question 8

6 marks

Explain why a solution of aluminium chloride, \( \text{AlCl}_3 \), is acidic while a solution of magnesium chloride, \( \text{MgCl}_2 \), is neutral.

Write your answer out first, then check it against the worked solution.

Question 9

4 marks

(a) State and explain the trend in atomic radius for the elements across Period 3 from sodium to chlorine.
(b) Explain why the ionic radius of phosphorus, \(P^{3-}\), is significantly larger than the ionic radius of silicon, \(Si^{4+}\).

Write your answer out first, then check it against the worked solution.

Question 10

5 marks

The melting points of the elements in Period 3 show a specific trend: Na (371 K), Mg (923 K), Al (933 K), Si (1683 K), P (317 K), S (392 K).
(a) Explain the increase in melting point from sodium to aluminium.
(b) Explain why silicon has the highest melting point in the period.
(c) Explain the decrease in melting point from silicon to phosphorus.

Write your answer out first, then check it against the worked solution.

* The content provided by thinka is generated by AI and may not always be accurate or up-to-date. Please use it as a supplementary resource and verify with official materials.

You've seen the model answer. Now get yours marked.

This page can show you how a good answer looks. It cannot tell you what your answer was missing. thinka marks your written work against the real mark scheme in about 15 seconds.

Get My Answers Marked Back to the notes

Want more questions like these? Get a fresh set on this topic, marked as you go.