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
... show full transcript
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 halogen that is a green gas at room temperature and pressure is chlorine.
Step 2
Write the word equation for this reaction.
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Answer
The word equation for the reaction of iron wool 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
To determine the mass of iron and chlorine in iron chloride, we must find the molar mass of iron chloride ( ext{FeCl}_2).
Calculate molar masses:
Molar mass of Iron (Fe) = 55.85 g/mol
Molar mass of Chlorine (Cl) = 35.45 g/mol
Molar mass of Iron Chloride (FeCl₂) = 55.85 + (2 × 35.45) = 126.75 g/mol
Calculate the mass of iron and chlorine in 125 g of iron chloride:
Mass of iron in 125 g:
Mass of iron=125g×126.75g55.85g≈54.8g
Mass of chlorine in 125 g:
Mass of chlorine=125g−54.8g≈70.2g
Step 5
The iron chloride speeds up the reaction because it is ______.
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Answer
The iron chloride speeds up the reaction because it is a catalyst.
Step 6
After the reaction, the mass of iron chloride is ______.
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Answer
After the reaction, the mass of iron chloride is unchanged.
