Steel is an alloy containing iron - Edexcel - GCSE Chemistry - Question 4 - 2023 - Paper 1
Question 4
Steel is an alloy containing iron.
When exposed to damp air, some steels will corrode to form rust.
(a) (i) Which gas in the air is needed for corrosion to occur?
... show full transcript
Worked Solution & Example Answer:Steel is an alloy containing iron - Edexcel - GCSE Chemistry - Question 4 - 2023 - Paper 1
Step 1
Which gas in the air is needed for corrosion to occur?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The gas needed for corrosion to occur is D oxygen. Oxygen is essential for the oxidation process that leads to rust formation.
Step 2
What type of reaction happens when the iron in steel corrodes?
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The type of reaction that occurs is c the iron has been oxidised. This means that the iron undergoes an oxidation process, resulting in the formation of iron oxides.
Step 3
Calculate the relative formula mass of this iron chloride.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To calculate the relative formula mass of iron chloride (FeCl₃), we must sum the relative atomic masses of its constituent elements:
Iron (Fe): 56.0
Chlorine (Cl): 35.5 (per Cl atom)
Since there are three chlorine atoms in the formula:
