Alloys are mixtures of two or more metals - Edexcel - GCSE Chemistry - Question 2 - 2019 - Paper 1
Question 2
Alloys are mixtures of two or more metals.
(a) Alloy steels are formed when other metals are mixed with iron.
Cutlery is made of stainless steel.
Give two reasons... show full transcript
Worked Solution & Example Answer:Alloys are mixtures of two or more metals - Edexcel - GCSE Chemistry - Question 2 - 2019 - Paper 1
Step 1
Give two reasons why cutlery is made of stainless steel rather than iron.
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Answer
Stainless steel does not rust or corrode, making it more suitable for cutlery that comes into contact with moisture and food.
Stainless steel is stronger than iron, providing better durability and resistance to deformation.
Step 2
Explain, using the information in Figure 4, why magnalium, rather than pure aluminium, is used for aircraft parts.
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Answer
Magnalium has a lower density than aluminium, which makes it lighter and advantageous for aircraft weight considerations.
Magnalium possesses a higher resistance to corrosion compared to aluminium, which is crucial for materials exposed to various environmental conditions in aviation.
Step 3
Calculate the percentage by mass of magnesium in the magnalium.
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Answer
To calculate the percentage by mass of magnesium, use the formula:
extPercentageofmagnesium=(total mass of magnaliummass of magnesium)×100
