This question is about elements in group 7, the halogens - Edexcel - GCSE Chemistry - Question 6 - 2022 - Paper 1
Question 6
This question is about elements in group 7, the halogens.
(a) Which halogen is a green gas at room temperature and pressure?
- A bromine
- B chlorine
- C fluorine
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Worked Solution & Example Answer:This question is about elements in group 7, the halogens - Edexcel - GCSE Chemistry - Question 6 - 2022 - Paper 1
Step 1
Which halogen is a green gas at room temperature and pressure?
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Answer
The correct answer is B chlorine, which is recognized as a green gas at room temperature and pressure.
Step 2
Write the word equation for this reaction.
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Answer
The word equation for the reaction when iron wool is heated with chlorine is:
iron + chlorine → iron chloride
Step 3
Give the name of the halogen in Figure 9 that is the most reactive with iron.
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Answer
The halogen in Figure 9 that is the most reactive with iron is chlorine.
Step 4
Calculate the mass of iron and the mass of chlorine in 125 g of iron chloride.
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Answer
Given that 34.4% of the mass of iron chloride is iron, we can calculate the masses as follows:
Mass of iron in 125 g of iron chloride:
extmassofiron=34.4extextg
To find the mass of chlorine, we subtract the mass of iron from the total mass of iron chloride:
extmassofchlorine=125extg−34.4extg=90.6extg
Step 5
The iron chloride speeds up the reaction because it is a _____.
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Answer
The iron chloride speeds up the reaction because it is a catalyst.
After the reaction, the mass of iron chloride is unchanged.
