Gases in the air
(a) In industry, nitrogen and oxygen are obtained from air - Edexcel - GCSE Chemistry - Question 2 - 2013 - Paper 1
Question 2
Gases in the air
(a) In industry, nitrogen and oxygen are obtained from air.
(i) Give the name of the process used.
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Worked Solution & Example Answer:Gases in the air
(a) In industry, nitrogen and oxygen are obtained from air - Edexcel - GCSE Chemistry - Question 2 - 2013 - Paper 1
Step 1
Give the name of the process used.
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Answer
The process used to obtain nitrogen and oxygen from air is called 'Fractional Distillation'.
Step 2
State why the air is cooled before the start of the process.
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Answer
The air is cooled before the start of the process to condense the gases, allowing them to be separated based on their different boiling points.
Step 3
Complete the sentence by putting a cross (✗) in the box next to your answer.
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Answer
Oxygen has a low boiling point because there are: D weak forces of attraction between the oxygen molecules.
Step 4
Describe what is meant by a covalent bond.
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Answer
A covalent bond is a type of chemical bond where two atoms share pairs of electrons. This sharing occurs between non-metal atoms, and it helps each atom achieve a stable electronic configuration.
Step 5
Give the electronic configuration of carbon (atomic number 6).
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Answer
The electronic configuration of carbon (atomic number 6) is 2.4.
Step 6
Draw a dot and cross diagram of a molecule of carbon dioxide.
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Answer
In the dot and cross diagram of CO₂, the carbon atom is in the center with one double bond to each of the two oxygen atoms. Each bonding electron pair is represented by a line or two dots for carbon and one cross for oxygen, while the outer electrons of each atom are shown accordingly.
