Factors Influencing Reaction Rates

Which of the following is a factor that affects the rate of a chemical reaction?

• Color of the reactants

• Temperature

• Shape of the container

• Time of day

Tags

NGSS.HS-PS1-5

What does increasing the concentration of reactants generally do to the rate of reaction?

• Decreases the rate

• Increases the rate

• Has no effect

• Stops the reaction

Tags

NGSS.HS-PS1-5

Which of the following best describes a catalyst?

• A substance that slows down a reaction

• A substance that increases the rate of a reaction without being consumed

• A reactant in the reaction

• A product of the reaction

Tags

NGSS.HS-PS1-5

How does surface area affect the rate of a chemical reaction?

• Larger surface area increases the rate

• Larger surface area decreases the rate

• Surface area has no effect

• Surface area only affects gases

Which of the following is NOT a factor that affects the rate of a chemical reaction?

• Pressure (for gases)

• Concentration

• Mass number of atoms

• Temperature

Tags

NGSS.HS-PS1-5

If the temperature of a reaction is increased, what happens to the kinetic energy of the particles?

• It decreases

• It stays the same

• It increases

• It disappears

Tags

NGSS.HS-PS3-2

Which of the following changes will increase the rate of reaction for a gas-phase reaction?

• Decreasing the pressure

• Increasing the pressure

• Decreasing the temperature

• Removing the catalyst

Tags

NGSS.HS-PS1-5

Which factor is most likely to affect the rate of a reaction between a solid and a liquid?

• Surface area of the solid

• Color of the liquid

• Volume of the container

• Mass of the container

Tags

NGSS.HS-PS1-5

A student increases the concentration of hydrochloric acid in a reaction with magnesium. What is the expected effect on the rate of hydrogen gas production?

• It will decrease

• It will increase

• It will remain unchanged

• It will stop completely

Tags

NGSS.HS-PS1-5

Why does increasing the temperature generally increase the rate of a chemical reaction?

• It increases the number of collisions between particles

• It decreases the activation energy

• It changes the color of the reactants

• It increases the mass of the products

Tags

NGSS.HS-PS1-5