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.
(ii) State why the air is cooled before the st... show full transcript
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 process to liquefy it. Cooling helps in condensing the gases, allowing them to be separated based on differences in 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. This sharing helps both atoms achieve a full outer shell of electrons, leading to increased stability.
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. Show outer electrons only.
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Answer
The dot and cross diagram of carbon dioxide (CO₂) shows the carbon atom in the center, with two oxygen atoms on either side. Each shared pair of electrons is represented by a line or a pair of dots. The carbon shares two electrons with each oxygen, resulting in double bonds.
