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The table shows some information about the Group 7 elements - OCR Gateway - GCSE Chemistry: Combined Science - Question 4 - 2021 - Paper 10
Question 4
The table shows some information about the Group 7 elements. | Group 7 element | Melting point (°C) | Boiling point (°C) | |------------------|--------------------|... show full transcript
Worked Solution & Example Answer:The table shows some information about the Group 7 elements - OCR Gateway - GCSE Chemistry: Combined Science - Question 4 - 2021 - Paper 10
Step 1
How many Group 7 elements are liquid at -40°C?
Answer
To determine how many Group 7 elements are liquid at -40°C, we need to analyze their melting points. An element will be liquid at a specific temperature if its melting point is below that temperature and its boiling point is above it.
From the table:
- Fluorine: Melting point is -220°C (solid at -40°C)
- Chlorine: Melting point is -101°C (liquid at -40°C) and boiling point is -34°C (also liquid at -40°C)
- Bromine: Melting point is -7°C (also liquid at -40°C) and boiling point is 59°C (remains liquid at -40°C)
- Iodine: Melting point is 114°C (solid at -40°C)
Thus, at -40°C, both chlorine and bromine are liquid. Therefore, the answer is B 1.