Chemical Kinetics Quiz

Samuel is observing how quickly a tablet dissolves in water. What aspect of the reaction is Samuel studying?

• Whether a reaction will occur

• The energy released by a reaction

• The rate at which a reaction occurs

• The balance of chemical equations

Jackson is trying to speed up a chemical reaction in his kitchen experiment. Which of the following actions will help him increase the rate of the reaction?

• Decreasing temperature

• Adding a catalyst

• Reducing surface area

• Diluting the reactants

• There are two molecules of A in the balanced equation

• The reaction is second order overall

• The rate is doubled when [A] is doubled

• The rate quadruples when [A] is doubled

True or False: David is conducting an experiment and writes the balanced chemical equation for his reaction. He wonders if he can determine the rate law directly from this equation. Is it true that rate laws are determined directly from the balanced chemical equation?

• True

• False

Samuel is monitoring how quickly a certain chemical disappears during an experiment. The rate at which the reaction occurs can be expressed as:

• ΔH/ΔT

• -Δ[Reactant]/Δt

• Molarity × Time

Abigail is studying the decomposition of nitrogen dioxide in her laboratory. The reaction she observes is: 2NO₂ → 2NO + O₂. She wants to write the correct rate expression for this reaction. Which of the following should she use?

• No change

• It doubles

• It triples

• It increases ninefold

Nora is studying the decomposition of a chemical in her lab. She wants to determine the order of the reaction by graphing her data. Which integrated rate law should Nora use to produce a straight line when graphed?

• [A] vs. t for first order

• ln[A] vs. t for first order

• 1/[A] vs. t for zero order

• [A]² vs. t for second order

Priya is studying a chemical reaction in her lab that follows second-order kinetics. She wants to record the correct unit for the rate constant k of this reaction. What is the unit of rate constant k for a second-order reaction?

• s⁻¹

• M⁻¹s⁻¹

• M/s

• M²/s

Olivia wants to keep her leftovers fresh for a longer time. Which of the following actions involves controlling the rate of a chemical reaction?

• Using sunscreen

• Refrigerating food

• Wearing safety goggles

• Washing hands