Rates of Reaction

Which of the following factors does NOT affect the rate of a chemical reaction?

• Temperature

• Concentration of reactants

• Catalyst

• Color of reactants

The rate of a chemical reaction can be determined by:

• Measuring the change in mass of the reactants.

• Measuring the change in volume of the reactants.

• Measuring the change in temperature of the reactants

• Measuring the change in concentration of the reactants over time.

Which of the following statements is true about the rate of a chemical reaction?

• The rate is always constant throughout the reaction.

• The rate decreases as the reaction proceeds.

• The rate increases as the concentration of reactants increases.

• The rate is independent of the nature of the reactants.

1. 
   The collision theory states that for a reaction to occur, particles must:

• Collide with sufficient energy

• Collide with proper orientation

• Collide with both sufficient energy and proper orientation

• Collide in a vacuum

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

• Higher temperature increases the concentration of reactant particles.

• Higher temperature increases the kinetic energy of particles resulting in more successful collisions.

• Higher temperature alters the stoichiometry of the reaction.

• Higher temperature increases the solubility of reactants in the solvent.

Why do catalysts increase the rate of a chemical reaction without being consumed in the process?

• Catalysts lower the activation energy required for the reaction to occur.

• Catalysts increase the concentration of reactant particles.

• Catalysts change the equilibrium constant of the reaction.

• Catalysts alter the nature of the reactants.

Where is the reaction the fastest

Where does the reaction stop?

Where does the reaction finish?

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

• a) Higher concentration increases number of particles and the frequency of collisions between reactant particles.

• b) Higher concentration increases the activation energy required for successful collisions.

• c) Higher concentration decreases the solubility of reactants in the solvent.

• 1. d) Higher concentration reduces the viscosity of the reaction mixture.