Pearson Edexcel International GCSE in Chemistry · 4CH1 · Free · no account needed
Group 7 — the Halogens — exam questions
12 original Incandio exam-style questions on Group 7 — the Halogens, 26 marks, about 26 minutes of writing. Each one carries the command word, the tariff and the specification statement it assesses, exactly as a paper presents them. This is an original Incandio practice question, written to reflect the structure and demands of the qualification. It is not an official Pearson Edexcel past-paper question.
This is the practice set for Group 7 — the Halogens — the lesson that teaches it. Read the lesson first if the idea is new; come here when you want to find out whether you can turn it into marks. Completely free, no account needed to read.
What these questions ask of you
9 command words run through this set, and on Pearson Edexcel International GCSE Chemistry each one means something precise. Answering the wrong command is the commonest way a candidate who understands the lesson still loses the mark.
- Which (1 mark)
- one option chosen from the set given
- State (1 mark)
- one precise fact, no justification
- Give (1–2 marks)
- a short factual answer — the most common chemistry command
- Describe (2–5 marks)
- developed, linked statements of what happens or what is observed Misread as: giving one bare observation where the tariff asked for a developed account
- Explain (2–4 marks)
- the reason, in terms of particles, bonding, energy or equilibrium Misread as: describing the observation without giving the chemistry that causes it
- Write (1–3 marks)
- the equation, formula or ionic equation, balanced, with state symbols where asked
- Suggest (1–3 marks)
- a plausible answer applying taught chemistry to an unfamiliar substance
- Identify (1–2 marks)
- the correct substance or feature selected from what is given
- Give a reason (1–2 marks)
- one reason — in chemistry this is a one-mark command
Assessed on Paper 1 (4CH1/1C) and Paper 2 (4CH1/2C), against AO1, AO2, AO3.
Where these sit in the specification
Pearson Edexcel International GCSE Chemistry (4CH1) — statements 2.5 · 2.8 · 2.7 · 2.6. Incandio is aligned to this specification; it is not published by, endorsed by or affiliated with Pearson, and it reproduces none of Pearson's wording.
The 12 questions
Answer them on paper, then open the lesson's exam practice to have them marked. The mark scheme, the accepted and rejected answers and the annotated model answer are in Incandio and are not printed here — an answer beside its question is not practice.
-
Table 1 — halogen solutions added to colourless halide solutions potassium chloride potassium bromide potassium iodide chlorine water no change turns orange turns brown bromine water no change no change turns brown iodine solution no change no change no change (a)
(1)Identify
Identify the most reactive halogen in Table 1.
Table 1 — halogen solutions added to colourless halide solutions potassium chloride potassium bromide potassium iodide chlorine water no change turns orange turns brown bromine water no change no change turns brown iodine solution no change no change no change (b)
(2)Give a reason
Give a reason, using two results from Table 1, for the answer you have given.
Table 1 — halogen solutions added to colourless halide solutions potassium chloride potassium bromide potassium iodide chlorine water no change turns orange turns brown bromine water no change no change turns brown iodine solution no change no change no change (c)
(3)Explain
Explain why the bottom row of Table 1 shows no change in any of the three tubes.
Table 1 — halogen solutions added to colourless halide solutions potassium chloride potassium bromide potassium iodide chlorine water no change turns orange turns brown bromine water no change no change turns brown iodine solution no change no change no change (d)
(3)Suggest
A student adds bromine water to potassium iodide and records the tube as turning brown. Suggest how she could confirm that the brown colour is iodine rather than the bromine she added.
Table 1 — halogen solutions added to colourless halide solutions potassium chloride potassium bromide potassium iodide chlorine water no change turns orange turns brown bromine water no change no change turns brown iodine solution no change no change no change (Total for Question 1 = 9 marks)
-
(1)Which
Which is the colour of chlorine gas at room temperature?
Colour A colourless B pale green C red-brown D grey-black (Total for Question 2 = 1 mark)
-
(1)State
State the physical state of bromine at room temperature.
(Total for Question 3 = 1 mark)
-
(1)Give
Give the number of electrons in the outer shell of a halogen atom.
(Total for Question 4 = 1 mark)
-
(2)Describe
Describe what is seen when chlorine water is added to colourless potassium bromide solution.
(Total for Question 5 = 2 marks)
-
(3)Explain
Explain why chlorine is more reactive than iodine.
(Total for Question 6 = 3 marks)
-
(2)Write
Write the balanced symbol equation for the reaction between chlorine and potassium bromide solution.
(Total for Question 7 = 2 marks)
-
(3)Suggest
Astatine is the halogen below iodine. Suggest whether astatine would displace iodine from potassium iodide solution, and why.
(Total for Question 8 = 3 marks)
-
(4)Explain
Explain, in terms of electrons, why a more reactive halogen is able to displace a less reactive one from a solution of its salt.
(Total for Question 9 = 4 marks)
Have them marked, then defend the answer
Practice tells you the mark; teaching it back tells you whether you understand it. On Incandio a topic counts as mastered only once you have taught it and defended it.
- Mark these questions — 12 questions, marked on Incandio against the authored scheme, with the mistake you actually made named.
- Teach it — explain Group 7 — the Halogens to Ember, an AI pupil who does not have it yet and asks the awkward question.
- Defend it — argue it against Humphry Davy over three rounds, marked against descriptors you can read first.
Completely free. No subscriptions, no paywalls, no account needed to start.
Back to the lesson
- Group 7 — the Halogens — A green gas, a brown liquid and a grey solid — and a trend that runs the opposite way to Group 1.
- All of Incandio Chemistry · Incandio Exam Practice