Plz
1) How will increasing the surface area of one or more reactants affect the reaction rate of a system?

A It will change the products of the reaction.

B It will speed up the reaction.

C It will slow down the reaction.

D It will have no effect on the reaction.

2)Which change will usually speed the reaction rate of a chemical system?

A increase the concentration of a reactant

B decrease the temperature of the system

C decrease the pressure of a system

D increase the concentration a product

3) Some metals found in a car’s exhaust system speed up a chemical reaction but are not used up.

How do these metals work to speed up the reaction?

A They act as catalysts.

B They increase the pressure in the system.

C They increase the temperature of the system.

D They increase the concentration of reactants.

4) How does a catalyst affect the activation energy of a reaction?

A A catalyst increases the activation energy needed for a reaction.

B A catalyst does not affect the activation energy of a reaction.

C A catalyst decreases the activation energy needed for a reaction.

D A catalyst eliminates the need for activation energy.

5) Which theory explains the increase in reaction rate caused by raising the temperature or raising the pressure of a system?

A potential energy theory

B activation energy theory

C surface area theory

D collision theory