Practice IB Chemistry Topic R1.1 Measuring Enthalpy Change with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for R1.1 Measuring Enthalpy Change and mirrors Paper 1A, 1B, 2 style where relevant.
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In a simple calorimetry experiment, which assumption is usually made?
If the temperature of the surroundings increases during a chemical reaction, what can be concluded about ?
In an experiment to determine for a neutralization reaction, which of the following must be measured?
If 0.050 mol of a substance releases 1.25 kJ of energy on combustion, what is the molar enthalpy change?
A student burns ethanol in a simple calorimeter and observes a sharp temperature increase in the surrounding water.
State whether the combustion of ethanol is exothermic or endothermic.
Sketch an energy profile diagram for this reaction.
Label the activation energy, reactants, and products on your diagram.
Explain, using bond enthalpies, why combustion reactions are typically exothermic.
The student suggests using propane instead of ethanol. Predict how the temperature change in the water might differ and justify your answer.