Quiz about PS - M19 L4 Notes Quizizz - Reaction Rates & Equilibrium

Question 1

A reversible reaction is one that can occur in both forward and reverse directions.

Accepted Answer

true

Answer

false

Question 2

Equilibrium is a state in which forward and reverse reactions or processes proceed at equal rates.

Accepted Answer

true

Answer

false

Question 3

What happens to the rate of a chemical reaction in solution when the concentration of a reactant is increased?

Accepted Answer

It increases

Answer

It decreases

Answer

It stays the same

Answer

It depends on the reaction

Question 4

Decreasing the volume of a mixture of reacting gases at constant temperature increases reaction rate because _______.

Accepted Answer

more collisions occur

Answer

the pressure is also decreased

Answer

collisions occur with greater energy

Answer

the particles are traveling more quickly

Question 5

Which is the term for substances that speed up reactions without being permanently changed?

Accepted Answer

Catalysts

Answer

Polymers

Answer

Inhibitors

Answer

Reactants

Question 6

Which best characterizes the state of equilibrium?

Accepted Answer

Forward and reverse reactions proceed at the same rate.

Answer

Energy is neither absorbed nor released.

Answer

No reactions occur.

Answer

There are equal concentrations of products and reactants.

Question 7

List four ways to change the rate of a chemical reaction.

Accepted Answer

Increase temperature, decrease particle size, use a catalyst, and increase reactant concentration.

Answer

Decrease temperature, use an inhibitor, increase particle size, and decrease reactant concentration.

Answer

Increase temperature, use a catalyst, increase pressure, and remove a reactant.

Answer

Decrease temperature, increase particle size, remove a catalyst, and increase pressure.

Question 8

Describe two ways in which you might state the rate of a chemical reaction.

Accepted Answer

By measuring the change in concentration of a reactant over time or the change in concentration of a product over time.

Answer

By observing the color change of the reaction mixture or by counting the number of molecules reacting per second.

Answer

By measuring the mass of the reactants at the end of the reaction or the temperature of the products.

Answer

By using the size of the container or the pH of the final solution.

Question 9

Explain what must happen in order for two molecules to react.

Accepted Answer

The molecules must collide with sufficient energy and in the correct orientation.

Answer

The molecules must move closer together and exchange electrons randomly.

Answer

The molecules must collide at any speed and form temporary bonds.

Answer

The molecules must be at the same temperature and have opposite charges.

Question 10

What is the difference between chemical and physical equilibrium?

Accepted Answer

Chemical equilibrium involves a reversible chemical reaction, while physical equilibrium involves reversible physical changes.

Answer

Chemical equilibrium is achieved only in closed systems, whereas physical equilibrium occurs in open systems.

Answer

Chemical equilibrium involves reactions that change substances' identities, while physical equilibrium involves changes in state without altering the identity.

Answer

Physical equilibrium occurs faster than chemical equilibrium because it does not involve breaking bonds.

PS - M19 L4 Notes Quizizz - Reaction Rates & Equilibrium

26 questions

At higher temperatures, particles have more energy and move faster. As a result, they collide more ________________________. They also collide with greater energy, increasing the percentage of collisions resulting in a reaction.

Increasing the concentration of a reactant in a solution ________________________ the rate of a reaction. The more reactant particles per unit volume, the greater the chance that a reaction will occur.

Increasing the pressure and decreasing the volume of a gas increases the concentration of the gas. This ________________________ reaction rate.

A spoonful of granulated sugar dissolves faster than a sugar cube. The difference is surface ________________________. Dissolving is a physical change, but the same principle applies to chemical changes.

A _____ is a substance that speeds up a chemical reaction without being permanently changed itself.

Catalysts are used in industry to speed up reactions such as ________________________ production.

Inhibitors slow down reactions or ________________________ them from occurring. Like catalysts, they themselves are not changed in the reaction.

Catalysts and inhibitors affect only the rate of a reaction. They do not change the ________________________ of product produced.

Many reactions under certain conditions can occur in ________________________ directions. These reactions are reversible.

A reversible reaction is one that can occur in both forward and reverse directions.

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