Limestone chunks are reaction with hydrochloric acid solution at constant temperature with average speed. If we crash the chunks of limestone into powder how would speed of reaction change?

• Reaction speeds up
• Reaction does not change
• Reaction slows down
• Reaction stops

Which of the following is NOT a factor affecting reaction rate?

• temperature
• catalysts
• particle size
• polarity

Reaction rate means...

• amount of product formed
• speed of reaction
• concentration of reacting particles
• combining reactants with products

Decreasing the particle size increases the reaction rate because

• It makes particles move faster
• It increases the likelihood of collisions with the correct geometry
• It decreases the surface area available to react
• It increases the number of collisions

To slow down a chemical reaction you will do one of the following:

• Place the reactants in hot water
• Place the products in ice bath
• Place the reactants in a ice bath
• Keep stirring the reactants with a stirring rod

The catalyst alters the rate of a chemical reaction by,

• providing an alternative pathway with a lower Ea

• changing the products formed in the direction of the reaction

• providing a surface on which the molecules react

• increasing the frequencies of collisions between molecules

Which of the following are true of reaction rates?

I. The overall rate law is determined by the fastest step of a reaction

II. The presence of a catalyst will increase the number of molecules entering the transition state

III. An increase in temperature will increase the rate of a reaction

IV. Decreasing the concentration of reactants will increase the rate at which products yield

• II+III+IV

• I+IV

• II + III

• I+II+III

Which factors increase the rate of a reaction?

• increasing temperature

• increasing concentration

• increasing surface area

• all of the above

What letter represents the activation energy?

• A

• B

• C

• D

Usually lowering the temperature will slow down a reaction.

• false
• true