Six-mark questions
Six-mark questions are extended open response questions. These require longer answers than the structured questions with fewer marks. It is wise to plan your answer rather than rushing straight into it, otherwise you may stray away from the key points.
Six-mark questions are marked using a levels-based mark scheme because they are open ended. To gain full marks, you need to:
- support explanations using scientific knowledge and understanding
- use appropriate scientific words and terms
- write clearly, linking ideas in a logical way
- maintain a sustained line of reasoning, rather than getting lost or bogged down
You are likely to see command words such as:
- 'describe' - you need to give an account but no reason
- 'explain' - you must give reasons or explanations
- 'devise' - you must plan or invent a procedure using your scientific knowledge and understanding
- 'evaluate' - you must review information, including identifying strengths and weaknesses, and make a supported conclusion
Six-mark questions may be synoptic questions. These questions bring together ideas from two or more topics. For example, a question about atoms could include ideas about atomic structure, isotopes, radiation and nuclear reactions.
Remember that the topics covered in the first paper are assumed knowledge for the second paper, so questions in the second paper may need knowledge and understanding of those topics too.
The answers shown here give marking points as bullet points. You do not usually need to include all of them to gain six marks, but you do need to write in full sentences, linking them logically and clearly.
Writing six-mark answers with Dr Alex Lathbridge
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Sample question 1 - Foundation
Question
Describe the arrangement and movement of particles in each of the three states of matter. Explain what happens to the particles in a liquid during boiling. [6 marks]
This question has been written by a Bitesize consultant as a suggestion to the type of question that may appear in an exam paper.
Particles in solids are close together, regularly arranged and vibrate about fixed positions [1]. Particles in liquids are close together, randomly arranged and move around each other [1]. Particles in gases are far apart [1] and randomly arranged [1]. During boiling, energy is transferred to particles [1] and the bonds between particles break [1].
Answering tip: Briefly plan the key points you want to include in your answer. For example:
- how particles are arranged (close/far apart, regular/random) and move in solids, liquids and gases
- energy and effect on bonds during boiling
Sample question 2 - Higher
Question
Sophia wants to buy a new kettle. She is not sure which one to buy.
The two kettles in the table are identical, apart from the material they are made out of.
Metal alloy kettle | Stainless steel kettle | |
Specific heat capacity (J/kg掳C) | 400 | 500 |
Mass of metal in kettle (kg) | 1.5 | 1.2 |
Mass of water in kettle (kg) | 1.8 | 1.8 |
Power (kW) | 3.0 | 3.0 |
Specific heat capacity (J/kg掳C) | |
---|---|
Metal alloy kettle | 400 |
Stainless steel kettle | 500 |
Mass of metal in kettle (kg) | |
---|---|
Metal alloy kettle | 1.5 |
Stainless steel kettle | 1.2 |
Mass of water in kettle (kg) | |
---|---|
Metal alloy kettle | 1.8 |
Stainless steel kettle | 1.8 |
Power (kW) | |
---|---|
Metal alloy kettle | 3.0 |
Stainless steel kettle | 3.0 |
Sophia puts 1.8 kg of cold water, at 20掳C, in each kettle.
She thinks that the alloy kettle will take a shorter time to heat the water up to boiling point (100掳C).
She finds that both kettles take the same time to reach 100掳C.
Explain why the kettles take the same time to heat the water up to 100掳C. [6 marks]
OCR Gateway Science, GCE Physics, Paper B751, June 2014 - Higher.
The mass of water is the same in each kettle (1.8 kg). The temperature rise of water in each kettle is also the same (80掳C). The power of each kettle is the same [1]. The alloy has a smaller specific heat capacity but has greater mass. Stainless steel has a larger specific heat capacity and a smaller mass [1].
Calculation:
energy required = specific heat capactity 脳 mass 脳 temperature increase [1]
In the metal alloy kettle, energy required = 400 脳 1.5 脳 80 = 48,000 J/kg掳C [1]
In the stainless teel kettle, energy required = 500 脳 1.2 脳 80 = 48,000 J/kg掳C [1]
So the amount of energy required to heat the same amount of water, by the same amount of temperature, is the same for both kettles [1].
Answering tip: Briefly plan the key points you want to include in your answer. For example:
- compare mass of water heated and temperature rise
- compare mass of metal and specific heat capacity
- work out the heat capacities, are they the same or are they different