Factors that Affect Reaction Rate: Temperature, Catalysts, Concentration of Reactants

Catalyst

substance that speeds up the rate of a chemical reaction

Are Catalysts consumed in a reaction?

Catalysts are not consumed

Is the equilibrium of a chemical reaction affected in any way by catalysts

Catalysts do not affect the equilibrium of a chemical reaction

Reaction Temperature

reaction rates generally increase as temperature is increased

The atoms of a substance have energy. T/F

True

Some atoms have a large amount of energy T/F

True

>Er

This means molecules have the energy required to react.

The rate of endothermic reactions ____________________ as temperature is raised

increases

What is the significance of Er in the diagram

For exothermic reactions what happens to the energy level of the products vs the energy level of the reactants.

the energy level of the products is lower than the energy level of the reactants.

For endothermic reactions what happens to the energy level of the products vs the energy level of the reactants.

the energy level of the products is higher than the energy level of the reactants.

Does reactant concentration increase reaction rate? T/F

True

T/F raising the pressure on reactants in the form of a gas will increase reaction rate

True

The effect of a ten degree increase in temperature is shown in the increased number of molecules having the energy required to react (>Er).

The figure shows that when the temperature is increased ten degrees, the number of molecules with the minimum energy to react, Er, has increased by the amount represented by the dark region of the graph.

What is the significance of Er in the diagram?