Mastering Reaction Rates

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

• Temperature

• Catalysts

• Color of reactants

• Surface area of reactants

What is the rate law?

• An equation that relates the rate of a reaction to the concentration of the reactants

• A law stating that reaction rates are constant

• A description of how temperature affects reaction rates

• A statement about the conservation of mass in reactions

According to collision theory, for a reaction to occur, particles must collide with:

• Sufficient energy and proper orientation

• Any energy and any orientation

• Sufficient energy but orientation is not a factor

• Proper orientation but energy is not a factor

What role do catalysts play in chemical reactions?

• They increase the reaction rate by raising the temperature

• They decrease the reaction rate by providing an alternative reaction pathway with a lower activation energy

• They increase the reaction rate by providing an alternative reaction pathway with a lower activation energy

• They are consumed in the reaction and need to be replenished

How does an increase in temperature generally affect the rate of a chemical reaction?

• It decreases the rate by reducing the number of collisions

• It has no effect on the rate of the reaction

• It increases the rate by increasing the energy of collisions

• It increases the rate by decreasing the concentration of reactants

What is the rate constant in a rate law?

• A variable that changes with the concentration of reactants

• A coefficient that indicates the stoichiometry of the reaction

• A proportionality constant that is specific to a particular reaction at a given temperature

• A constant that represents the universal rate of reaction for all chemical reactions

Which of the following is NOT true about inhibitors?

• They increase the activation energy of a reaction

• They are often used to slow down the rate of chemical reactions

• They can be used to control the rate of potentially dangerous reactions

• They increase the rate of reaction by providing an alternative pathway

What effect does increasing the concentration of reactants have on the rate of reaction, assuming all other factors are constant?

• It decreases the rate of reaction

• It has no effect on the rate of reaction

• It increases the rate of reaction

• It changes the color of the reaction mixture

In the context of reaction rates, what is meant by the term "activation energy"?

• The energy released when a reaction occurs

• The minimum energy that colliding particles must have for a reaction to occur

• The energy required to break bonds in the reactants

• The energy required to increase the temperature of the reactants

Which statement best describes the effect of a catalyst on the activation energy and the rate constant of a reaction?

• A catalyst increases the activation energy and decreases the rate constant

• A catalyst decreases the activation energy and increases the rate constant

• A catalyst has no effect on the activation energy but increases the rate constant

• A catalyst increases both the activation energy and the rate constant