Unit 4: Reactivity 1: What Drives Chemical Reactions?
Topic 4.1: Measuring Enthalpy Change Questions
Practice 4 exam-style questions for IB Chemistry Topic 4.1. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1Calculate2 marks
• Aimnova practice
A 2.50 g sample of a fuel is burned completely and the heat released raises the temperature of 250.0 g of water from 18.0 °C to 47.4 °C.
Calculate the heat energy, in kJ, transferred to the water.
(c(water) = 4.18 J g⁻¹ K⁻¹.)
Calculate the heat energy, in kJ, transferred to the water.
(c(water) = 4.18 J g⁻¹ K⁻¹.)
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• Aimnova practice
Burning 0.500 g of methanol, CH3OH (M = 32.05 g mol⁻¹), transfers 11.3 kJ of heat to the water in a calorimeter, and the water temperature rises.
Calculate the enthalpy of combustion of methanol, ΔHc, in kJ mol⁻¹, and explain the sign of your answer.
Calculate the enthalpy of combustion of methanol, ΔHc, in kJ mol⁻¹, and explain the sign of your answer.
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• Aimnova practice
When ammonium nitrate is dissolved in water in a beaker, the temperature of the water drops sharply.
State whether the process is exothermic or endothermic, the sign of ΔH, and the direction of energy transfer between the system and the surroundings. [3]
State whether the process is exothermic or endothermic, the sign of ΔH, and the direction of energy transfer between the system and the surroundings. [3]
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• Aimnova practice
Sketch and fully label the energy profile for an exothermic reaction.
Your labels should include the reactants, the products, the activation energy Eₐ and the enthalpy change ΔH. [3]
Your labels should include the reactants, the products, the activation energy Eₐ and the enthalpy change ΔH. [3]
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