Q25 of 9701_s16_qp_13

Question 25

Question 25 of 40

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Older MCQs might not have the typical A, B, C, D choices. They have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such combinations to the answer.

A 1, 2 and 3 are correct

B 1 and 2 only are correct

C 2 and 3 only are correct

D 1 only is correct

Topics Tested

5. Chemical energetics

5.1. Enthalpy change, \(\Delta H\)

construct and interpret a reaction pathway diagram, in terms of the enthalpy change of the reaction and of the activation energy

8. Reaction kinetics

8.3. Homogeneous and heterogeneous...

explain and use the terms catalyst and catalysis: (a) explain that, in the presence of a catalyst, a reaction has a different mechanism, i.e. one of lower activation energy (b) explain this catalytic effect in terms of the Boltzmann distribution (c) construct and interpret a reaction pathway diagram, for a reaction in the presence and absence of an effective catalyst

15. Halogen compounds

15.1. Halogenoalkanes

describe the elimination reaction with NaOH in ethanol and heat to produce an alkene as exemplified by bromoethane