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Look at the boiling points of some Group 7 elements - OCR Gateway - GCSE Chemistry: Combined Science - Question 8 - 2018 - Paper 1
Question 8
Look at the boiling points of some Group 7 elements. Element Boiling point in °C Fluorine −188 Chlorine −34 Bromine 59 What is the most likely boiling p... show full transcript
Worked Solution & Example Answer:Look at the boiling points of some Group 7 elements - OCR Gateway - GCSE Chemistry: Combined Science - Question 8 - 2018 - Paper 1
Step 1
What is the most likely boiling point of iodine?
Answer
To determine the boiling point of iodine based on the boiling points of other Group 7 elements listed, we notice a trend.
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Boiling Points of Group 7 Elements:
- Fluorine: −188 °C
- Chlorine: −34 °C
- Bromine: 59 °C
From these values, we observe that as we move down the group, the boiling points increase.
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Trend Analysis:
- The increase in boiling point suggests that iodine, being below bromine in the periodic table, will have a boiling point higher than that of bromine (59 °C).
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Options Available:
- A: −20 °C
- B: 50 °C
- C: 184 °C
- D: 350 °C
Considering the trend, it is evident that since many of the other options are below bromine's boiling point of 59 °C, they are less likely to be correct.
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Conclusion: Based on this trend and looking at the available choices, the most likely boiling point for iodine is C: 184 °C.