Chemistry 9701/12 — October/November 2019
Cambridge AS Level · Multiple Choice (AS Level) · answer key with instant marking and worked solutions
Topics Atoms, Molecules and Stoichiometry · Introduction to Organic Chemistry · Chemical Energetics · Electrochemistry · Equilibria · Hydroxy Compounds · +14 more
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The diagram shows a Boltzmann distribution of the energies of gaseous molecules and the activation energies, , of a reaction with and without a catalyst.
Which statement about this distribution curve is correct?
Options
A If the temperature of the gas is increased, the maximum of the curve becomes higher.
B If the temperature of the gas is increased, the maximum of the curve moves to the left.
C The fraction of molecules that react in the presence of a catalyst is shown by the area shaded with lines sloping up to the right (/).
D The fraction of molecules that react in the absence of a catalyst is shown by the area shaded with lines sloping down to the right ().
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