Rate of Chemical Reactions

Chemistry ⇒ Chemical Kinetics and Equilibrium

Rate of Chemical Reactions starts at 10 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Rate of Chemical Reactions. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 11

Describe how temperature affects the rate constant (k) according to the Arrhenius equation.

Describe the difference between average rate and instantaneous rate of a reaction.

Explain how a catalyst affects the rate of a chemical reaction.

Explain why increasing the concentration of reactants generally increases the rate of reaction.

Explain why powdered zinc reacts faster with hydrochloric acid than a lump of zinc.

For a reaction: 2A → B, if the rate of formation of B is 0.05 mol L^-1 s^-1, what is the rate of disappearance of A?

For the reaction: 2NO₂ → 2NO + O₂, if the rate of disappearance of NO₂ is 0.02 mol L^-1 s^-1, what is the rate of appearance of O₂?

For the reaction: A + 2B → C, if the rate of disappearance of B is 0.04 mol L^-1 s^-1, what is the rate of disappearance of A?

Which of the following best defines the rate of a chemical reaction? (1) The speed at which products are formed (2) The speed at which reactants are consumed (3) The change in concentration of a reactant or product per unit time (4) The total amount of product formed at the end of the reaction

Which of the following factors does NOT affect the rate of a chemical reaction? (1) Temperature (2) Pressure (3) Color of reactants (4) Concentration of reactants

Which of the following graphs represents a zero-order reaction? (1) A straight line with a negative slope when plotting concentration vs. time (2) A curve that levels off as time increases (3) A straight line with a positive slope when plotting rate vs. concentration (4) A horizontal line when plotting rate vs. concentration

Which of the following is NOT a method to measure the rate of a chemical reaction? (1) Measuring the volume of gas evolved (2) Measuring the change in color intensity (3) Measuring the change in temperature (4) Measuring the change in pressure for a solid

The half-life of a first-order reaction is independent of _______.

The minimum energy required for a reaction to occur is called _______.

The rate constant (k) of a reaction depends on _______ and the nature of the reactants.

The rate of a chemical reaction is usually expressed in units of _______ per unit time.

True or False: A catalyst changes the equilibrium position of a reaction.

True or False: The rate of a chemical reaction always remains constant throughout the reaction.

True or False: The rate of a reaction can be determined by measuring the change in mass of the reactants or products over time.

True or False: For a first-order reaction, the time required for the concentration of the reactant to decrease from 0.8 mol L^-1 to 0.4 mol L^-1 is the same as from 0.4 mol L^-1 to 0.2 mol L^-1.