Rates of Chemical Reactions

________ the concentration ______ the reaction rate.

• increasing; decreases

• increasing; increases

• decreasing; increases

• decreasing; does not effect

Tags

NGSS.HS-PS1-5

Enzymes in your body act as catalysts. Thus, the role of enzymes is to___________.

• inhibit chemical reactions.

• increase the rate of chemical reactions.

• decrease the rate of chemical reactions.

Tags

NGSS.HS-LS1-7

A substance that slows down or stops a chemical reaction is called a(n)______________.

• concentrate

• catalyst

• inhibitor

• product

The minimum amount of energy needed for substances to react is called__________.

• Activation Energy

• Catalyst Energy

• Endothermic Energy

• Exothermic Energy

Which factors increase the rate of a reaction.

• increasing temperature

• increasing concentration

• increasing surface area

• all of these

Tags

NGSS.HS-PS1-5

What happens to the rate of a chemical reaction when the surface area of a solid reactant is increased?

• The rate decreases.

• The rate increases.

• The rate remains the same.

• The rate becomes zero.

The rate of a chemical reaction is NOT affected by which of the following:

• temperature

• concentration

• particle size (surface area)

• All of these affect reaction rates

Tags

NGSS.HS-PS1-5

Which of the following is true about reaction rates?

• increase as temperature decreases

• decrease when a catalyst is added

• increase as surface area increases

• decreases as reactant concentration increases

Tags

NGSS.HS-PS1-5

Which change increases the rate of a chemical reaction?

• Increasing the size of solid reactant particles

• Decreasing the concentration of aqueous reactants

• Increasing the surface area of a solid reactant

• Decreasing the pressure of gaseous reactants

Tags

NGSS.HS-PS1-5

In general, if the temperature of a chemical reaction is increased, the reaction rate

• increases

• decreases

• remains the same

• cannot be predicted

Tags

NGSS.HS-PS1-5