Unit 4-5 MCQ

Front

What is the definition of a limiting reactant in a chemical reaction?

Back

The limiting reactant is the substance that is completely consumed in a chemical reaction, limiting the amount of product that can be formed.

Front

What is the net ionic equation for the reaction between fluoride ions and hydrogen ions?

Back

The net ionic equation is: F^-(aq) + H^+(aq) \longrightarrow HF(aq).

Front

What does it mean for a reaction to be second order overall?

Back

A second order reaction means that the rate of the reaction is proportional to the square of the concentration of one reactant or the product of the concentrations of two reactants.

Front

What are the units of the rate constant, k, for a second order reaction?

Back

The units of the rate constant, k, for a second order reaction are L mol^-1 time^-1.

Front

What is the significance of the strong smell of ammonia in the reaction between NH3 and H2O?

Back

The strong smell indicates that NH3 is present in significant amounts, suggesting it is a weak base that partially ionizes in water.

Front

How do you determine the limiting reactant in a reaction?

Back

To determine the limiting reactant, compare the mole ratio of the reactants used in the reaction to the mole ratio required by the balanced equation.

Front

What is the role of water in the reaction between NH3 and H2O?

Back

Water acts as a proton donor (acid) in the reaction, facilitating the formation of hydronium ions (H3O+).

Front

What is the difference between a strong acid and a weak acid?

Back

A strong acid completely dissociates in solution, while a weak acid only partially dissociates.

Front

What is the definition of a strong base?

Back

A strong base is a substance that completely dissociates in solution to produce hydroxide ions (OH^-).

Front

What is the purpose of writing a net ionic equation?

Back

The net ionic equation shows only the species that participate in the reaction, omitting spectator ions.