plumiThe particle model: OCR GCSE Chemistry A questions
Every OCR GCSE Chemistry A exam question on C1.1 The particle model, 2018–2025, with its mark scheme and examiner’s report.
Paper
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Calculations
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Q16(a)
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Q20(a)(i)
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The whole paper ↗Q20(a)(iii)
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Q16(a)(i)
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The whole paper ↗Q16(a)(iii)
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Q18(d)(i)
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Q18(a)(iii)
The whole paper ↗Q21(c)
The whole paper ↗- Your answer
All 47 questions on The particle model, as a list
- June 2025, Paper 1 Foundation, Q1 (1 mark): Which state of matter is shown in the particle model diagram? A Aqueous B Gas C Liquid D Solid Your answer [1]
- June 2025, Paper 1 Foundation, Q7 (1 mark): Fluorine has a melting point of –220 °C and a boiling point of –188 °C. What is the state of fluorine at 25 °C? A Aqueous B Gas C Liquid D Solid Your answer [1]
- June 2024, Paper 1 Foundation, Q16(a) (2 marks): Draw lines to connect each temperature with the particle model of water. Temperature Particle Model –5 °C 25 °C 110 °C [2]
- June 2024, Paper 3 Higher, Q15 (1 mark): At 25 °C, fluorine is a gas, bromine is a liquid and iodine is a solid. Which statement is correct? A At 25 °C, bromine does not have enough heat energy to melt
- June 2024, Paper 3 Higher, Q20(a)(i) (2 marks): Complete the diagram to show what happens to the particles as a solid changes to a liquid. solid liquid [2]
- June 2024, Paper 3 Higher, Q20(a)(ii) (2 marks): Which statements about changes of state are correct? Tick (3) two boxes. Boiling describes a gas turning into a liquid. Freezing is a chemical change. Melting i
- June 2024, Paper 3 Higher, Q20(a)(iii) (2 marks): The particle model has limitations when showing changes of state. Explain two limitations of the particle model. 1 2 [2]
- June 2023, Paper 1 Foundation, Q12 (1 mark): The melting point of magnesium chloride is 714 °C. Which state symbols are used for magnesium chloride at these temperatures? State symbol State symbol at 25 °C
- June 2023, Paper 1 Foundation, Q16(a)(i) (1 mark): The diagrams show three different particle models. A B C Which particle model represents a gas? Tick (3) one box. A B C [1]
- June 2023, Paper 1 Foundation, Q16(a)(ii) (1 mark): Oxygen has a melting point of –219 °C and a boiling point of –183 °C. State a temperature at which oxygen will be a liquid. [1]
- June 2023, Paper 1 Foundation, Q16(a)(iii) (3 marks): Complete the sentences about the particle models. Use words from the list. condensing freezing less melting more A liquid becoming a solid is called . In a soli
- June 2023, Paper 3 Higher, Q1 (1 mark): Which term is a correct description of ice turning from a solid to a liquid? A Chemical change B Evaporation C Freezing D Physical change Your answer [1]
- June 2023, Paper 3 Higher, Q18(d)(i) (3 marks): At –78 °C, and 0.1 MPa pressure, carbon dioxide changes state from a solid to a gas. Changing state from a solid to a gas is called subliming. Describe what hap
- June 2023, Paper 3 Higher, Q18(d)(ii) (3 marks): Carbon dioxide can be a liquid at different pressures and temperatures. Pressure Melting point Boiling point Sublimation (MPa) (°C) (°C) point (°C) 0.1 –78 1.0
- June 2022, Paper 1 Foundation, Q2 (1 mark): Which particle model diagram shows a gas? A B C D Your answer [1]
- June 2022, Paper 1 Foundation, Q7 (1 mark): Which description is correct for melting ice? A There is a chemical change and a change of state. B There is a chemical change and a reaction occurs. C There is
- June 2022, Paper 1 Foundation, Q14 (1 mark): The element mercury is a liquid at 25 °C. Which row about mercury is correct? Melting Point Boiling Point (°C) (°C) A above 25 above 25 B below 25 below 25 C be
- June 2022, Paper 1 Foundation, Q18(a)(iii) (1 mark): What is the state of substance B at room temperature? Put a ring around the correct answer. Solid Liquid Gas [1]
- June 2022, Paper 1 Foundation, Q21(c) (2 marks): At room temperature, ethene is a gas and bromine is a liquid. Use the particle model to describe two differences between the movement or arrangement of the part
- June 2022, Paper 3 Higher, Q1 (1 mark): Which particle model diagram shows evaporation? A B C D Your answer [1]
- June 2022, Paper 3 Higher, Q16(c) (2 marks): At room temperature, ethene is a gas and bromine is a liquid. Use the particle model to describe two differences between the movement or arrangement of the part
- November 2021, Paper 1 Foundation, Q2 (1 mark): Which change of state is described by the term freezing? A Gas to liquid B Liquid to gas C Liquid to solid D Solid to liquid Your answer [1]
- November 2021, Paper 1 Foundation, Q11 (1 mark): The melting point of iodine is 114 °C. The boiling point of iodine is 184 °C. What is the state of iodine at room temperature? A Aqueous B Gas C Liquid D Solid
- November 2021, Paper 1 Foundation, Q21(c) (2 marks): Lithium fluoride is a solid at room temperature. Describe how particles are arranged in a solid. [2]
- November 2021, Paper 3 Higher, Q10 (1 mark): The table shows melting points and boiling points for some Group 7 elements. Element Melting point (°C) Boiling point (°C) Fluorine -220 -188 Chlorine -102 -34
- November 2021, Paper 3 Higher, Q18(b) (2 marks): A student investigates the reaction of magnesium carbonate with dilute hydrochloric acid. Look at the equation for the reaction. MgCO3(s) + 2HCl (aq) MgCl2(aq)
- November 2021, Paper 3 Higher, Q18(c)(ii) (2 marks): The particle model is not a perfect representation of the three states of matter. Describe two limitations of the particle model. 1 2 [2]
- November 2020, Paper 1 Foundation, Q15 (1 mark): Substance Y melts at −7 °C and boils at 59 °C. What is the state of substance Y at room temperature? A Gas B Liquid C Plasma D Solid Your answer [1] SECTION B A
- November 2020, Paper 1 Foundation, Q16(a)(i) (2 marks): Draw a line to match each diagram with the correct state of matter. Diagram State of matter Solid Liquid Gas [2]
- November 2020, Paper 1 Foundation, Q16(a)(ii) (1 mark): When a liquid is heated to its boiling point, it will turn into a gas. Use the particle model to explain why this is a physical change. [1]
- November 2020, Paper 1 Foundation, Q16(b)(i) (1 mark): Which two substances are gases at room temperature? Tick (3) two boxes. A B C D [1]
- June 2019, Paper 1 Foundation, Q1 (1 mark): This particle model shows the particles in iron. What state does this particle model represent? A Gas B Liquid C Plasma D Solid Your answer [1]
- June 2019, Paper 1 Foundation, Q3 (1 mark): Substances can exist in three states of matter. Solid Liquid Gas Y What is change of state Y called? A Condensing B Evaporating C Freezing D Melting [1] Your an
- June 2019, Paper 1 Foundation, Q16(d)(i) (2 marks): The particle model shows how particles are arranged and how they move in solids, liquids and gases. Describe how the particles are arranged in a solid. [2]
- June 2019, Paper 1 Foundation, Q16(d)(ii) (1 mark): Describe how the particles move in a solid. [1]
- June 2019, Paper 1 Foundation, Q17(a)(i) (1 mark): What is the melting point of compound X? Melting point = °C [1]
- June 2019, Paper 3 Higher, Q9 (1 mark): The melting point of bromine is −7 °C. The boiling point of bromine is 59 °C. What state would bromine be at room temperature? A Aqueous B Gas C Liquid D Solid
- June 2019, Paper 3 Higher, Q18(a)(ii) (1 mark): Simple distillation uses evaporation and condensation to separate mixtures. evaporation ethanol (l) ethanol (g) condensation Describe the change in the arrangem
- June 2019, Paper 3 Higher, Q18(a)(iii) (1 mark): Describe the change in the movement of particles as substances evaporate. [1]
- June 2018, Paper 1 Foundation, Q17(c) (2 marks): Succinic acid has a melting point of 184 °C and a boiling point of 235 °C. What is the state of succinic acid at 25 °C? Explain your answer. [2]
- June 2018, Paper 1 Foundation, Q25(a)(i) (1 mark): Solid magnesium cannot be compressed. Why? [1]
- June 2018, Paper 1 Foundation, Q25(a)(ii) (3 marks): Solid magnesium cannot flow, but liquid magnesium can flow. Explain why. [3]
- June 2018, Paper 1 Foundation, Q25(a)(iii) (2 marks): Magnesium gas completely fills any container it is put in. Explain why. [2]
- June 2018, Paper 3 Higher, Q16(a)(i) (1 mark): Solid magnesium cannot be compressed. Why? [1]
- June 2018, Paper 3 Higher, Q16(a)(ii) (3 marks): Solid magnesium cannot flow, but liquid magnesium can flow. Explain why. [3]
- June 2018, Paper 3 Higher, Q16(a)(iii) (2 marks): Magnesium gas completely fills any container it is put in. Explain why. [2]
- June 2018, Paper 3 Higher, Q18(b) (2 marks): The student looks up some data on melting points and boiling points. Melting point Boiling point Substance Formula State at 25 °C (°C) (°C) Propane C3H8 –188 –4
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