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 liquefy 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 one or more pairs of electrons to achieve stability in their outer electron shells. This bond usually occurs between non-metal atoms.
Step 5
Give the electronic configuration of carbon (atomic number 6).
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Answer
The electronic configuration of carbon is 2.4.
Step 6
Draw a dot and cross diagram of a molecule of carbon dioxide.
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Answer
A dot and cross diagram for carbon dioxide (CO₂) would illustrate the carbon atom in the center with two oxygen atoms bonded to it. The carbon would share electrons with each oxygen atom to form two double covalent bonds. The outer electrons should be represented as dots (•) from one atom and crosses (x) from the other.
