GCSE Edexcel Chemistry Combined Science Group 7 – Halogens: This question is about elements

Question

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
   D iodine

(b) Bromine, chlorine and iodine all react with heated iron wool.
   Figure 6 shows the speed of these reactions.

| halogen | description of reaction with heated iron wool |
   | --------| ---------------------------------------------- |
   | bromine | reacts quickly                                 |
   | chlorine | reacts very quickly                           |
   | iodine | reacts slowly                                  |

Figure 6

(i) When iron wool is heated with chlorine, iron chloride is formed.
   Write the word equation for this reaction.

(ii) Give the name of the halogen in Figure 6 that is the most reactive with iron.

(iii) 34.4% of the mass of iron chloride is iron.
   Calculate the mass of iron and the mass of chlorine in 125 g of iron chloride.

mass of iron = __________ g mass of chlorine = __________ g

(c) Alkenes react with halogens.
   When iron chloride is added to the reaction mixture, the reaction is much faster but the products are the same.
   Use words from the box to complete the sentences.
   
   |  an acid | a catalyst | higher | lower | a reactant | unchanged |
   
   The iron chloride speeds up the reaction because it is a __________.
   After the reaction, the mass of iron chloride is __________.

This question is about elements in group 7, the halogens - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2022 - Paper 1

Worked Solution & Example Answer:This question is about elements in group 7, the halogens - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2022 - Paper 1

Which halogen is a green gas at room temperature and pressure?

When iron wool is heated with chlorine, iron chloride is formed. Write the word equation for this reaction.

Give the name of the halogen in Figure 6 that is the most reactive with iron.

34.4% of the mass of iron chloride is iron. Calculate the mass of iron and the mass of chlorine in 125 g of iron chloride.

The iron chloride speeds up the reaction because it is a __________.

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