B
(i) Name the English scientist pictured on the right who isolated the elements sodium and potassium in the early 1800s - Leaving Cert Chemistry - Question B - 2005
Question B
B
(i) Name the English scientist pictured on the right who isolated the elements sodium and potassium in the early 1800s.
(ii) Both sodium and potassium corrode eas... show full transcript
Worked Solution & Example Answer:B
(i) Name the English scientist pictured on the right who isolated the elements sodium and potassium in the early 1800s - Leaving Cert Chemistry - Question B - 2005
Step 1
Name the English scientist pictured on the right who isolated the elements sodium and potassium in the early 1800s.
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Answer
The English scientist who isolated the elements sodium and potassium in the early 1800s is Sir Humphry Davy.
Step 2
What is meant by corrosion?
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Answer
Corrosion refers to the process by which metals react with their environment, particularly with oxygen and moisture, to form compounds such as oxides. This reaction gradually deteriorates the metal.
Step 3
How is a piece of iron galvanised?
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Answer
A piece of iron is galvanised by dipping it in molten zinc or coating it with a layer of zinc. This creates a protective barrier between the iron and the environment.
Step 4
How does this prevent the iron from corroding?
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Answer
Galvanisation prevents iron from corroding by providing a protective layer of zinc that acts as a sacrificial metal. If the zinc layer is damaged, it corrodes preferentially, protecting the underlying iron from rusting.
Step 5
State one method, other than galvanising, which helps prevent iron from corroding.
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Answer
One method, other than galvanising, that helps prevent iron from corroding is painting the iron surface. This paint acts as a barrier to moisture and oxygen.
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