Factors Affecting the Rate of Chemical Reactions

In a closed system, what happens to the rate of reaction as the concentration of reactants decreases over time?

• The rate increases

• The rate decreases

• The rate remains constant

• The rate becomes zero

Tags

NGSS.HS-PS1-5

Which of the following is true about the effect of surface area on reaction rate?

• Larger surface area decreases the rate

• Larger surface area increases the rate

• Surface area has no effect

• Only affects reactions in gaseous state

What is the primary reason a catalyst increases the rate of a reaction?

• It increases the temperature

• It lowers the activation energy

• It increases the concentration of reactants

• It changes the products of the reaction

Which of the following is NOT a factor affecting the frequency of collisions in a chemical reaction?

• Temperature

• Surface area

• Activation energy

• Concentration

Tags

NGSS.HS-PS1-5

What is the role of a catalyst in a chemical reaction?

• It increases the activation energy

• It provides an alternative pathway with lower activation energy

• It decreases the concentration of reactants

• It increases the temperature of the reaction

Which factor is most likely to affect the orientation of reactant particles during a collision?

• Temperature

• Surface area

• Concentration

• Molecular structure

In an energy profile diagram, how is the effect of a catalyst represented?

• By a higher peak

• By a lower peak

• By a wider curve

• By a narrower curve

Which of the following factors increases only the effectiveness of collisions?

• temperature

• catalysts

• concentration

• particle size

Tags

NGSS.HS-PS1-5

Which of the following increase the reaction rate?

• less surface area

• lower temperature

• an inhibitor

• increased concentration

Tags

NGSS.HS-PS1-5

Which of the following increase the reaction rate?

• less surface area

• lower temperature

• increasing pressure

• increased concentration

Tags

NGSS.HS-PS1-5