CfE Higher Chemistry - Rates of Reaction

Front

Why does a small increase in temperature result in a large increase in the rate of reaction?

Back

More high energy collisions are taking place.

Front

The activation energy for the reverse reaction is

Back

X - Y

Front

The enthalpy change for the forward reaction can be defined as

Back

Y - Z

Front

What is the enthalpy change, in kJmol^-, for the reverse reaction P→ R based on the potential energy diagram?

Back

-10

Front

Temperature is a measure of

Back

average kinetic energy of a substance's molecules

Front

In area X, what is true about molecular energy and activated complexes?

Back

All molecules have the energy to form an activated complex

Front

When a catalyst is used, the activation energy of the forward reaction is reduced to 35 kJ mol^–1. What is the activation energy of the catalysed reverse reaction?

Back

65 kJ mol^–1

Front

What was the reaction time, in seconds, when the concentration of the reactant was 0.50 mol l^–1?

Back

5.0

Front

What is correct for the reverse reaction?

Back

Exothermic - Ea +20

Front

Which of the following is not a correct statement about the effect of a catalyst?

• Provides an alternative route to the products
• Lowers the energy which molecules need for successful collisions
• Provides energy so that more molecules have successful collisions
• Reactant molecules form weak bonds on active sites

Back

Provides energy so that more molecules have successful collisions