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 sta... 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.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
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.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Air is cooled before the process to liquefy it. This is essential because cooling reduces the volume of gases and allows for the separation of different components based on their boiling points during fractional distillation.
Step 3
Complete the sentence by putting a cross (✖) in the box next to your answer.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
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.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
A covalent bond is a type of chemical bond where two atoms share one or more pairs of electrons. This sharing allows each atom to attain the electron configuration of a noble gas, resulting in a stable arrangement.
Step 5
Give the electronic configuration of carbon (atomic number 6).
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
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.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The dot and cross diagram for a molecule of carbon dioxide (CO₂) shows the carbon atom in the center with double bonds to two oxygen atoms. Each bond is represented by shared electrons, where dots represent the electrons from the carbon atom and crosses represent the electrons from the oxygen atoms. The diagram illustrates that carbon shares its electrons with both oxygen atoms, creating a stable molecule.
