plumiWhy are there temperature changes in chemical reactions?: OCR GCSE Combined Science B questions
Every OCR GCSE Combined Science B exam question on C1.2 Why are there temperature changes in chemical reactions?, 2018–2025, with its mark scheme and examiner’s report.
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Q4(a)(i)
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Q4(a)(ii)
The whole paper ↗Q4(b)(i)
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The whole paper ↗Q4(b)(iii)
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Q4(c)(i)
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The whole paper ↗Q10(a)
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Q10(b)
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The whole paper ↗Q10(d)
The whole paper ↗Q10(e)
The whole paper ↗Q10(f)
The whole paper ↗Q2(a)
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Q2(b)
The whole paper ↗Q2(c)
The whole paper ↗Q2(d)
The whole paper ↗Q2(e)
The whole paper ↗Q2(f)
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All 46 questions on Why are there temperature changes in chemical reactions?, as a list
- June 2025, Chemistry Paper 2 Foundation, Q4(a)(i) (2 marks): Suggest a simple experiment to show that this reaction is endothermic, and describe the results expected. Experiment Results [2]
- June 2025, Chemistry Paper 2 Foundation, Q4(a)(ii) (3 marks): Complete the reaction profile for an endothermic reaction. Include labels for: • the products • the activation energy. Energy reactants Progress of reaction [3]
- June 2025, Chemistry Paper 2 Foundation, Q4(b)(i) (2 marks): Describe how the mass of fuel burned is measured. [2]
- June 2025, Chemistry Paper 2 Foundation, Q4(b)(ii) (3 marks): Calculate the change in the thermal energy of the water. Use the formula: Change in thermal energy (J) = mass of water (g) × 4.2 × temperature change (°C) Chang
- June 2025, Chemistry Paper 2 Foundation, Q4(b)(iii) (3 marks): Calculate the change in thermal energy of the water if only 1 g of fuel was burned. Use your answer to (b)(ii). Give your answer to 2 significant figures. Chang
- June 2025, Chemistry Paper 6 Higher, Q4(b) (4 marks): A scientist does an experiment to find the change in thermal energy of the water when 1 mole of hexane burns in air. They use this apparatus: Copper can Water B
- June 2025, Chemistry Paper 6 Higher, Q4(c)(i) (3 marks): Calculate the change in thermal energy of the water. Use the equation: Change in thermal energy (kJ) = 4.2 × mass of water (kg) × temperature change (°C) Change
- June 2025, Chemistry Paper 6 Higher, Q4(c)(iii) (3 marks): Calculate the change in thermal energy of the water when 1 mole of hexane burns. Use the table and your answers to (c)(i) and (c)(ii). Change in thermal energy
- June 2024, Chemistry Paper 2 Foundation, Q10(a) (2 marks): They want to find the temperature change during the reaction. 1 g masses of solid calcium hydroxide are added one by one to 50 cm3 of dilute hydrochloric acid i
- June 2024, Chemistry Paper 2 Foundation, Q10(b) (2 marks): The table shows the student’s results: Mass of calcium hydroxide (g) Temperature of hydrochloric acid (°C) 0 22.0 1 29.5 2 37.0 3 44.5 4 52.0 5 59.5 Plot the re
- June 2024, Chemistry Paper 2 Foundation, Q10(c) (1 mark): Draw a line of best fit. [1] 60 50 Temperature of hydrochloric 40 acid (°C) 30 20 0 1 2 3 4 5 Mass of calcium hydroxide (g)
- June 2024, Chemistry Paper 2 Foundation, Q10(d) (1 mark): Which relationship describes the graph? Put a ring around the correct option. y = mx y = mx2 y = mx + c y = mx – c [1]
- June 2024, Chemistry Paper 2 Foundation, Q10(e) (2 marks): Calculate the change in temperature if 3.8 g of calcium hydroxide is added to the hydrochloric acid. Use the graph. Temperature change = °C [2]
- June 2024, Chemistry Paper 2 Foundation, Q10(f) (3 marks): Calculate the change in thermal energy when 3.8 g of calcium hydroxide is added to 50 cm3 of hydrochloric acid. Use the formula: Change in thermal energy (J) =
- June 2024, Chemistry Paper 6 Higher, Q2(a) (2 marks): They want to find the temperature change during the reaction. 1 g masses of solid calcium hydroxide are added one by one to 50 cm3 of dilute hydrochloric acid i
- June 2024, Chemistry Paper 6 Higher, Q2(b) (2 marks): The table shows the student’s results: Mass of calcium hydroxide (g) Temperature of hydrochloric acid (°C) 0 22.0 1 29.5 2 37.0 3 44.5 4 52.0 5 59.5 Plot the re
- June 2024, Chemistry Paper 6 Higher, Q2(c) (1 mark): Draw a line of best fit. [1] 60 50 Temperature of hydrochloric 40 acid (°C) 30 20 0 1 2 3 4 5 Mass of calcium hydroxide (g)
- June 2024, Chemistry Paper 6 Higher, Q2(d) (1 mark): Which relationship describes the graph? Put a ring around the correct option. y = mx y = mx2 y = mx + c y = mx – c [1]
- June 2024, Chemistry Paper 6 Higher, Q2(e) (2 marks): Calculate the change in temperature if 3.8 g of calcium hydroxide is added to the hydrochloric acid. Use the graph. Temperature change = °C [2]
- June 2024, Chemistry Paper 6 Higher, Q2(f) (3 marks): Calculate the change in thermal energy when 3.8 g of calcium hydroxide is added to 50 cm3 of hydrochloric acid. Use the formula: Change in thermal energy (J) =
- June 2023, Chemistry Paper 6 Higher, Q7(a)(i) (1 mark): Why is this an example of an oxidation reaction? [1]
- June 2023, Chemistry Paper 6 Higher, Q7(a)(iii) (3 marks): The table shows some bond energies. Bond energy (kJ / mol) H-H 436 O=O 498 O-H 464 Calculate the energy change for this reaction: 2 H-H + O=O 2 H-O-H Energy cha
- June 2023, Chemistry Paper 6 Higher, Q7(b)(i) (3 marks): Describe an experiment the student could do and their expected results to confirm the statement in the box. Experiment Results [3]
- June 2023, Chemistry Paper 6 Higher, Q7(b)(ii) (3 marks): Complete the energy profile for ammonium nitrate dissolving in water. Label the energy profile to show the: • activation energy • reactants • products. Use the
- June 2022, Chemistry Paper 2 Foundation, Q1(b)(i) (1 mark): What is the name given to a change which makes the temperature of the mix decrease? Put a ring around the correct option. Combustion Endothermic Exothermic Free
- June 2022, Chemistry Paper 2 Foundation, Q1(b)(ii) (3 marks): Draw lines to connect each label with its correct position on the diagram. Label Position A Activation energy Energy of reaction B Products C Reactants D [3]
- June 2022, Chemistry Paper 2 Foundation, Q1(c) (2 marks): Kofi plans an experiment to find the energy change when the ammonium nitrate from a cold pack dissolves in water. The energy change depends on the mass of water
- June 2022, Chemistry Paper 2 Foundation, Q1(d) (3 marks): Here are Kofi’s results. Mass of water used = 250 g Temperature of water before adding ammonium nitrate = 20.2 °C Temperature of water after adding ammonium nit
- June 2022, Combined Science Paper 4 Foundation, Q2(a)(i) (1 mark): Give one reason why Jack repeated the experiment. [1]
- June 2022, Combined Science Paper 4 Foundation, Q2(a)(ii) (3 marks): Calculate the mean increase in temperature for Jack’s results. Give your answer as a whole number. Mean increase = °C [3]
- June 2022, Combined Science Paper 4 Foundation, Q2(b)(i) (1 mark): Which word describes the type of reaction Jack has investigated? Tick (✓) one box. Combustion Endothermic Exothermic Neutralisation [1]
- June 2022, Combined Science Paper 4 Foundation, Q2(b)(ii) (1 mark): Jack draws the reaction profile for his investigation. Tick (✓) the correct diagram. products reactants energy energy products reactants progress of reaction pr
- June 2022, Combined Science Paper 4 Foundation, Q2(c) (2 marks): Draw one line from an improvement Jack could make to the correct explanation, to make the temperature change data more accurate. Improvement Explanation Change
- November 2020, Chemistry Paper 2 Foundation, Q6(b)(i) (2 marks): What apparatus does Nina need to make her measurements? Put a ring around the two correct answers. balance beaker condenser funnel pH meter thermometer [2]
- November 2020, Chemistry Paper 2 Foundation, Q6(b)(ii) (2 marks): Nina uses a lighted splint to light the wick which starts the ethanol burning. The flame from the lighted splint provides the activation energy needed to start
- November 2020, Chemistry Paper 2 Foundation, Q6(c)(i) (1 mark): Is the reaction endothermic or exothermic? Use Nina’s results to explain your answer. [1]
- November 2020, Chemistry Paper 2 Foundation, Q6(c)(ii) (1 mark): What is the mass of ethanol burned in Nina’s experiment? Mass of ethanol burned = g [1]
- November 2020, Chemistry Paper 2 Foundation, Q6(c)(iii) (1 mark): What is the temperature change of the water in Nina’s experiment? Temperature change of the water = °C [1]
- November 2020, Chemistry Paper 2 Foundation, Q6(c)(iv) (3 marks): Calculate the energy that was needed to change the temperature of the water in Nina’s experiment. Use the equation: Energy change (J) = 4200 × mass of water (kg
- June 2019, Chemistry Paper 2 Foundation, Q9(c)(i) (2 marks): Draw lines to connect each letter with its correct label. Letter Label Reactants A Products B Energy change of reaction C Activation energy [2]
- June 2019, Chemistry Paper 2 Foundation, Q9(c)(ii) (2 marks): Complete the sentences to explain what Fig. 9.1 shows. Use words from the list. You may use each word once, more than once, or not at all. less than more than t
- June 2019, Chemistry Paper 2 Foundation, Q9(d) (2 marks): James uses a firelighter. The firelighter burns with a hot flame which makes the charcoal start to burn. Which two statements explain how the firelighter makes
- June 2019, Chemistry Paper 6 Higher, Q9(a) (3 marks): David uses a burning firelighter to make some of the charcoal start to burn. charcoal burning firelighter When the firelighter has been used up, the fire contin
- June 2019, Chemistry Paper 6 Higher, Q9(b) (4 marks): Complete the reaction profile diagram for the combustion of charcoal. Include the following labels on your diagram: reactants products activation energy energy
- June 2019, Chemistry Paper 6 Higher, Q9(c) (4 marks): When charcoal burns in insufficient air it forms carbon monoxide. Carbon monoxide can also act as a fuel. 2CO(g) + O2(g) 2CO2(g) Calculate the energy given out
- June 2018, Chemistry Paper 6 Higher, Q3(a)(i) (2 marks): Which statements are true only for melting, which are true only for photosynthesis and which are true for both? Put a tick (✓) in one box in each row. True only
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