IB Chemistry SL 4.1 Reactivity Question Bank

Practise IB Chemistry SL 4.1 with evidence-led questions on reactivity, reaction types, acids, bases and chemical change.

Covered syllabus points

1.1.1—Energy transfer 1.1.2—Endothermic vs. exothermic 1.1.3—Stability and energy 1.1.4—Standard enthalpy change (ΔH⦵)

[Maximum number: 1]

The increased concentration of carbon dioxide in the atmosphere is thought to result from the increased combustion of fossil fuels such as petroleum.

Outline why the energy available from an engine will be less than these theoretical values.

[Maximum number: 1]

Chlorine occurs in Group 7, the halogens.

Chloroethene, $\mathrm{H}_{2} \mathrm{C}=\mathrm{CHCl}$ , the monomer used in the polymerization reaction in the manufacture of the polymer poly(chloroethene), PVC, can be synthesized in the following two-stage reaction pathway.

Stage 1: $\quad \mathrm{C}_{2} \mathrm{H}_{4}(\mathrm{~g})+\mathrm{Cl}_{2}(\mathrm{~g}) \rightarrow \mathrm{ClCH}_{2} \mathrm{CH}_{2} \mathrm{Cl}(\mathrm{g})$

Stage 2: $\quad \mathrm{ClCH}_{2} \mathrm{CH}_{2} \mathrm{Cl}(\mathrm{g}) \rightarrow \mathrm{H}_{2} \mathrm{C}=\mathrm{CHCl}(\mathrm{g})+\mathrm{HCl}(\mathrm{g})$

State whether the reaction given in stage 1 is exothermic or endothermic.

[Maximum number: 3]

Phenylethene (styrene) is produced from ethylbenzene in a gas-phase equilibrium.

Figure for Question 1.1 Measuring enthalpy changes question 3 — IB Chemistry SL

The forward reaction is endothermic, uses iron(III) oxide as a catalyst, and takes place at 900 K .

Sketch the energy profile for the reaction, both with and without the catalyst, labelling $\Delta H$ and the activation energies.

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Covered syllabus points

1.1 Measuring enthalpy changes question 1

1.1 Measuring enthalpy changes question 2

1.1 Measuring enthalpy changes question 3