Grade 11 Physical Sciences · Matter and Materials · Paper 2 (Chemistry)

Ideal Gas Laws Grade 11

Real Ideal Gas Laws past paper questions and answers from 2023 to 2025, with each memo split into the ticks examiners give. Try one, mark yourself, and see exactly which skill cost you marks.

past paper questions: 79 past paper questions
skills: 8 skills
videos: 8 videos

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Question 1.4 · November 2025 · Paper 2 · Provincial · 2 marks

Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A–D) next to the question numbers (1.1 to 1.10) in the ANSWER BOOK, for example 1.11 E.

1.4 The diagram below shows a gas syringe containing a certain gas. When the plunger is at position A the volume occupied by the gas is X and exerts a pressure P. When the plunger moves to position B the volume occupied by the gas is

\frac{1}{3}

X.

What is the DIFFERENCE in pressure exerted by the gas between points A and B?(2) Diagram for question 1.4

A $3$ P
B $\frac{2}{3}$ P
C $\frac{1}{3}$ P
D $2$ P

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Ideal Gas Laws skills

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More Ideal Gas Laws Grade 11 questions and answers

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4. Question 9.2.2 · November 2025 · Paper 1 · Provincial · 2 marks
Learners investigate the relationship between current in a conductor and the potential differences across the ends of the conductor. The graph below is obtained from their investigation.
9.2 Write down the:
9.2.2 Control variables for this investigation(2)
Show the memo (2 ticks)Memo
1. ✓
  First control variableTemperature (accept resistance)
  1 mark · Identify variables in an investigation
2. ✓
  Second control variableLength of conductor (or thickness of conductor)
  1 mark · Identify variables in an investigation
5. Question 4.2.1 · November 2025 · Paper 2 · Provincial · 2 marks
A group of learners investigated the relationship between the pressure and volume of a certain gas. The graph of the pressure versus inverse of volume was obtained from the data in the investigation.
4.2 From the investigation write down:
4.2.1 An investigative question for this investigation(2)
Show the memo (2 ticks)Memo
1. ✓
  Variables statedHow does the pressure of a gas affect the volume?
  OR
  What is the relationship between pressure and volume of the gas?
  1 mark · Write investigative question or conclusion
2. ✓
  Question about the relationshipThe question asks how the pressure and the volume are related (it ends with a question mark).
  1 mark · Write investigative question or conclusion
6. Question 1.7 · November 2024 · Paper 2 · Provincial · 2 marks
1.7 A fixed amount of gas occupies a volume V exerts a pressure P at a constant temperature. If the volume is doubled, the new pressure of the gas will be ...(2)
1. A $\frac{1}{4}$ P
2. B $\frac{1}{2}$ P
3. C P
4. D 4P
Show the memo (1 tick)Memo
1. ✓
  Correct optionBoyle's law: $p_{1} V_{1} = p_{2} V_{2}$
  $P \times V = p_{2} \times 2 V$
  $p_{2} = \frac{1}{2} P$
  
  Answer: B
  2 marks · Calculate with the gas equations
7. Question 3.2.1 · November 2024 · Paper 2 · Provincial · 2 marks
During an investigation, the MELTING POINTS of the hydrogen halides were determined. The results of the investigation are shown in the graph below.
3.2 The melting points of HBr and $HC ℓ$ are compared.
3.2.1 What is the relationship between strength of the intermolecular forces and melting point?(2)
Show the memo (1 tick)Memo
1. ✓
  RelationshipThe stronger the intermolecular forces the higher the melting point.
  2 marks · Write investigative question or conclusion
8. Question 2.2 · June 2024 · Paper 1 · Provincial · 2 marks
The apparatus shown below was used to determine the resultant of two co-planar forces X and Y acting at a common point O.
2.2 Explain why pulleys are used in this experiment.(2)
Show the memo (2 ticks)Memo
1. ✓
  Changes the direction of the forcesThe pulleys change the direction of the forces
  1 mark · Describe and evaluate an experiment
2. ✓
  Magnitude unchangedwithout changing the magnitude.
  1 mark · Describe and evaluate an experiment
9. Question 1.5 · November 2023 · Paper 2 · Provincial · 2 marks
1.5 Determine what the new pressure in kPa will be if $750$ mℓ nitrogen gas in the atmosphere is compressed to $500$ mℓ, keeping the temperature constant?(2)
1. A $2, 70 \times 1 0^{- 4}$ kPa
2. B $67, 53$ kPa
3. C $151, 95$ kPa
4. D $1, 5$ atm
Show the memo (1 tick)Memo
1. ✓
  Correct optionThe gas starts at atmospheric pressure, $p_{1} = 101, 3$ kPa. At constant temperature:
  $p_{1} V_{1} = p_{2} V_{2}$
  $(101, 3) (750) = p_{2} (500)$
  $p_{2} = 151, 95$ kPa
  
  Answer: C
  2 marks · Calculate with the gas equations
10. Question 4.1 · November 2023 · Paper 2 · Provincial · 2 marks
Learners conducted an investigation to determine the relationship between the pressure and volume of a given mass of $O_{2}$ gas, while keeping the temperature constant.

They made the sketch graph below, to show their results:
4.1 Write a suitable investigative question for this investigation.(2)
Show the memo (1 tick)Memo
1. ✓
  Investigative questionWhat is the relationship between the pressure and volume of an enclosed mass of gas, when the temperature is kept constant?
  2 marks · Write investigative question or conclusion

Ideal Gas Laws Grade 11 videos

Short lessons from South African teachers first. Videos load only when you tap play, to save your data.

Gas Laws Grade 11: Motion of particles and kinetic theory of gasesMiss Martins Maths and Science

Gas Laws: Equations and Variables you must know!Miss Martins Maths and Science

Metric Unit Prefix Conversions: How to Convert Metric System Prefixes | Crash Chemistry AcademyCrash Chemistry Academy

Independent, Dependent and Controlled VariablesScience Ready

Physical Sciences Practical investigation/experiments for grade 10-12Miss Martins Maths and Science

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