Draw a fully labelled energy profile diagram that clearly shows each step in the reaction. Assume the reaction is an exothermic reaction.

Select all of the correct statements about reaction rates from the choices below. 1. The lower the rate of a reaction the longer it takes to reach completion.2. The rate of a slow step has more effect on the overall reaction rate than the rate of a fast step.3. Reaction rates decrease with increasing temperature.4. As a reaction progresses its rate goes down.5. Solid catalysts increase reaction rates as their surface areas increase.6. The rate of a reaction is independent of temperature.7. Reaction rates can show little change as masses of solid reactants increase.

(a) Select all of the correct statements about reaction rates from the choices below. The lower the rate of a reaction the longer it takes to reach completion. Solid catalysts increase reaction rates as their surface areas increase. Catalysts decrease reaction rates. Reaction rate constants decrease with increasing temperature. The higher the rate of a reaction the longer it takes to reach completion. O Reaction rates always increase as masses of solid reactants increase. Reaction rates decrease with increasing temperature.

Burning methane with oxygen is a highly exothermic reaction. Yet a mixture of methane and oxygen can be kept indefinitely without any reaction occurring. How is this possible?

When the concentrations of reactant molecules are increased, the rate of reaction increases. The best explanation for this is that as the reactant concentration increases, the activation energy increases. the frequency of molecular collisions increases. the average kinetic energy of molecules increases. the rate constant increases.