Factors Affecting Chemical Reactions Mastery Test

Who proposed the concept of activation energy in 1888?

• Amadeo Avogadro

• Antoine Lavoisier

• Svante Arrhenius

• John Dalton

What is the minimum energy required for a chemical reaction to occur?

• Activation energy

• Chemical energy

• Potential energy

• Kinetic energy

Which of the following does not affect the rate of a chemical reaction?

• Surface area of reactants

• Concentration of reactants

• Type of chemical bonds

• Presence of a catalyst

Which term describes the peak energy level of a chemical reaction diagram?

• Reaction rate

• Activated complex

• Chemical bond

• Temperature

What is the purpose of a catalyst in a reaction?

• To lower the activation energy

• To increase the activation energy

• To stop the reaction

• To change the products

Which factor explains why rusting occurs faster in coastal areas?

• Presence of more oxygen

• Higher humidity and salt concentration

• Lower temperature

• Smaller surface area

Why does increasing the temperature speed up a reaction?

• It lowers the activation energy

• It increases the number of successful collisions

• It decreases the concentration of reactants

• It removes energy from the system

How does increasing the concentration of reactants affect the reaction rate?

• It increases the frequency of collisions

• It decreases the activation energy

• It changes the chemical equation

• It lowers the temperature of the reaction

Which factor explains why finely ground sugar dissolves faster than sugar cubes?

• Temperature

• Surface area

• Catalyst

• Concentration

How do enzymes speed up biological reactions?

• By increasing activation energy

• By acting as catalysts

• By reducing the concentration of reactants

• By lowering the temperature