Chapter 10 - Reaction Rates and Equilibrium

Question 1

What are homogeneous catalysts?

Answer 1

• Same physical state as the reactants
• Reacts with reactant to form intermediate which breaks down to give product and regenerate catalyst
• Gas or liquid

Question 2

What are heterogenous catalysts?

Answer 2

• Different physical state to reactants
• Reactant molecules absorbed onto surface of catalyst where reaction takes place and product released
• Solid

Question 3

What is the effect of higher temperature on Boltzmann distribution curve?

Answer 3

• Peak lower and shifted to right: average energy increases
• Greater proportion of molecules have sufficient energy to overcome activation energy

Question 4

What is the effect of a catalyst on Boltzmann distribution curve?

Answer 4

Greater proportion of molecules exceed new lower activation energy

Question 5

What is dynamic equilibrium?

Answer 5

• Rate of forward reaction is equal to rate of backwards reaction
• Concentration of reactants and products do not change
• Closed system