IB Chemistry HL 1.1.2 Endothermic Vs Exothermic Questions

Apply exam reasoning to connect ΔH sign, reactant and product energy levels, heat direction and observable evidence of endothermic or exothermic processes.

Exam points

Classify a process as endothermic or exothermic from temperature change, heat absorbed or released, bond-process evidence or the sign of ΔH.
Interpret an enthalpy-level or potential-energy diagram by comparing reactant and product enthalpies and identifying the direction of heat transfer.
Explain observable evidence of an exothermic or endothermic process, such as temperature change, melting, sound or other energy transfer to or from the surroundings.

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Study 1.1.2—Endothermic vs. exothermic conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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Two groups of students (Group A and Group B) carried out a project* on the chemistry of some group 7 elements (the halogens) and their compounds.

In the first part of the project, the two groups had a sample of iodine monochloride (a corrosive brown liquid) prepared for them by their teacher using the following reaction.

\mathrm{I}_{2}(\mathrm{~s})+\mathrm{Cl}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{ICl}(\mathrm{l})

The following data were recorded.

Table for Question IB Chemistry HL 1.1.2 Endothermic Vs Exothermic Questions question 1 — IB Chemistry HL

Using a digital thermometer, the students discovered that the reaction was exothermic. State the sign of the enthalpy change of the reaction, $\Delta H$ .

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IB Chemistry HL 1.1.2 Endothermic Vs Exothermic Questions question 1