Extended open response questions require longer answers than structured questions that have fewer marks. Open response questions are usually worth 6 marks, but some are worth fewer marks.
It is wise to plan your answer first by making some notes. This will help you to include all the key points.
To gain full marks, you need to:
Open response questions often use these command words:
Open response questions may be synoptic questions, which bring together ideas from two or more topics. For example, a question about fertilisers could include ideas about covalent substances, acids and alkalis, chemical calculations and effects on the environment.
The answers shown here give marking points as bullet points. You do not usually need to include all of them to gain full marks, but you do need to write in sentences, linking them logically and clearly.
This page contains AQA material which is reproduced by permission of AQA.
The image shows a distance-time graph of a car.
Explain what the graph shows about the motion of the car between point A and point E.
You should use values from the graph in your answer. [4 marks]
A man is driving his car at a constant speed on a wet road.
He sees a fallen tree on the wet road and tries to stop quickly to prevent an accident.
Explain why the man may not be able to stop in time. [6 marks]
A salt copper sulfate can be made by reacting copper carbonate with dilute sulfuric acid.
CuCO3(s) + H2SO4(aq) → CuSO4(aq) + H2O(l) + CO2(g)
Write a method that a student could use to prepare a pure, dry sample of copper sulfate.
You do not need to write a risk assessment or include safety points. [6 marks]