This question is about Group 7 elements - AQA - GCSE Chemistry Combined Science - Question 4 - 2022 - Paper 1
Question 4
This question is about Group 7 elements.
What are the Group 7 elements known as?
Why do Group 7 elements react in similar ways?
Figure 3 shows the structure of a ... show full transcript
Worked Solution & Example Answer:This question is about Group 7 elements - AQA - GCSE Chemistry Combined Science - Question 4 - 2022 - Paper 1
Step 1
What are the Group 7 elements known as?
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Answer
The Group 7 elements are known as halogens.
Step 2
Why do Group 7 elements react in similar ways?
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Answer
Group 7 elements react in similar ways because they all have 7 electrons in their outer shell, allowing them to gain one electron to achieve a full outer shell.
Step 3
What is the molecular formula of the chlorine oxide molecule in Figure 3?
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The molecular formula of the chlorine oxide molecule is ClO₂.
Step 4
Complete Figure 4.
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Answer
The y-axis scale for the melting points should be completed from -100 °C to -250 °C. The bar for the melting point of fluorine should be plotted at -220 °C.
Step 5
Explain the trend in the melting points of the Group 7 elements.
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Answer
In Group 7, as you move down the group, the melting points increase. This is because the molecules increase in size, leading to stronger intermolecular forces between the molecules, which requires more energy to separate them.
Step 6
What is the state symbol for bromine at -50 °C?
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The state symbol for bromine at -50 °C is (l) for liquid.
Step 7
Name one more process that happens at the surface of bromine at its boiling point.
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One more process that happens at the surface of bromine at its boiling point is condensation.
