Rates of reaction 1

What affects the rate of a reaction?

• concentration

• temperature

• surface area

• All of the above

Which best describes a catalyst?

• decreases reaction rate by raising activation energy

• increases reaction rate by lowering activation energy

• prevents reaction

• raises activation energy no matter what

High-energy particle collisions are more frequent:

• when temperature is increased

• when activation energy is higher

• when temperature is decreased

• when an inhibitor is present

Which of the following CAN affect reaction rates? Check all that apply?

• temperature

• concentration

• surface area

• catalysts

How will a rate of reaction be altered if temperature is increased?

• reaction rate decreases (goes slower)

• reaction rate increases (goes faster)

• reaction rate is constant (stays the same)

Products will form faster if which of the following occurs? Select all that apply.

• surface area is increased

• temperature is decreased

• reactant concentration is increased

• the reactant solution is not stirred

Which of the following increases a reaction rate without being used up?

• catalyst

• product

• reactant

How does a catalyst affect a reaction rate?

• it makes the reaction faster by lowering the activation energy and energy needed to form the activated complex

• it makes the reaction faster by raising the activation energy and energy needed to form the activated complex

• it makes the reaction slower by lowering the activation energy and energy needed to form the activated complex

• it makes the reaction slower by raising the activation energy and energy needed to form the activated complex

When a sugar cube is crushed up, the particles get smaller. How has the surface area of the particles changed?

• the surface area increases

• the surface area decreases

• the surface area remains constant

When a sugar cube is crushed up, the particles get smaller. How has the surface area of the particles changed?

• the surface area increases

• the surface area decreases

• the surface area remains constant