Sample exam questions - air and water - OCR 21st CenturyMultiple choice questions

Understanding how to approach exam questions helps to boost exam performance. Question types will include multiple choice, structured, mathematical and practical questions.

Part ofChemistry (Single Science)Air and water

Multiple choice questions

Multiple choice questions will appear throughout both exam papers, and at both Foundation tier and Higher tier.

These questions provide you with a number of answers, from which you must select the answer or answers that you think are correct.

The question may tell you in bold how many ticks, rings or lines to draw. If you draw less than this, or more than this, you will not be able to get full marks. Make sure that you draw straight lines rather than complex wavy lines.

There will usually be more options than correct answers. Don't just go for the first option that looks correct - read each option carefully and decide whether it is right or wrong.

These questions have been written by Bitesize consultants as suggestions to the types of questions that may appear in an exam paper.

Sample question 1 - Foundation

Question

What is the correct formula for nitrogen dioxide? [1 mark]

Tick one box.

ANO
BNO2
CN2O
DNO3
EN2
A
NO
B
NO2
C
N2O
D
NO3
E
N2

Sample question 2 - Foundation

Question

Scientists have found many methods to reduce the emission of air pollutants.

Put a tick (✔) in the correct box next to each statement to show whether it is true or false. [4 marks]

TrueFalse
Gas scrubbing reduces emissions of carbon dioxide from power stations
A catalytic converter reduces emissions of nitrogen monoxide
A catalytic converter reduces emissions of carbon dioxide
Low sulfur fuel reduces emissions of sulfur dioxide
Gas scrubbing reduces emissions of carbon dioxide from power stations
True
False
A catalytic converter reduces emissions of nitrogen monoxide
True
False
A catalytic converter reduces emissions of carbon dioxide
True
False
Low sulfur fuel reduces emissions of sulfur dioxide
True
False

Sample question 3 - Higher

Question

Which of the following can be explained using the particle model?

Put a tick (✔) in the box next to the correct statement. [1 mark]

AA gold bar weighs more than an iron bar of the same volume
BMercury has a lower melting point than aluminium
CWhen melted, iron can be poured to take the shape of a mould
DCopper is a conductor of electricity and sulfur is not
A
A gold bar weighs more than an iron bar of the same volume
B
Mercury has a lower melting point than aluminium
C
When melted, iron can be poured to take the shape of a mould
D
Copper is a conductor of electricity and sulfur is not

Sample question 4 - Higher

Question

Hydrogen reacts with iodine to form hydrogen iodide. The bond energy data is in the table below:

BondBond energy
H-H436 kJ/mol
I-I151 kJ/mol
H-I299 kJ/mol
BondH-H
Bond energy436 kJ/mol
BondI-I
Bond energy151 kJ/mol
BondH-I
Bond energy299 kJ/mol

Use this bond data to calculate the energy change of this reaction and pick from an option below. [1 mark]

Tick one box.

A288 kJ/mol
B-11 kJ/mol
C-288 kJ/mol
D11 kJ/mol
E576 kJ/mol
A
288 kJ/mol
B
-11 kJ/mol
C
-288 kJ/mol
D
11 kJ/mol
E
576 kJ/mol