During equilibrium, the rates of the forward and the reverse reaction are ________

unequal for exothermic reactions

unequal for endothermic reactions

How do catalysts increase the rate of reaction?

the activation energy is lowered

The frequency of collisions is the increased

the energy of collisions is increased

Both the frequency and energy of collisions is increased

What is the activation energy?

the minimum energy needed to begin a reaction

the quantity of heat absorbed in a reaction

the energy given off after reactants collide.

both the energy and frequeny of collisions in increased the energy difference between reactants and products

When the system X + 2 Y <=> Z has reached equilibrium, which of the following is TRUE?

Forward and backward reactions occur at the same rate.

Forward reaction and Backward reaction stop.

Forward reaction has sped up and backward reaction has slowed down.

Forward reaction has slowed down and backward reaction has sped up.

Le Chatelier's Principle states that if a chemical system at equilibrium is stressed,

the system will adjust to reduce the stress

the system will adjust to increase the stress

Increase in temperature of the reactants can do one of the following

Increase collision between the particles thus increasing the rate.

Allow less effective collision between the particles

Which of the following slows down the rate of a chemical reaction?

Place the reactants in a ice bath

Place the reactants in hot water

Keep stirring the reactants with a stirring rod

If more reactants are used in a chemical reaction, more products will be produced. This is because

More reactants have more atoms to react to form more products

More reactants cause the reaction to heat up

More reactants take up the same volume

Too many products can slow down the reaction

During equilibrium, the rates of the forward and the reverse reaction are ________

unequal for exothermic reactions

unequal for endothermic reactions

A chemical equilibrium may be established by starting a reaction with __________

equal quantities of reactants and products.

any quantities of reactants and products.

Which of the following is true for a chemical reaction at equilibrium?

the rates of the forward and reverse reactions are equal

only the forward reaction stops

only the reverse reaction stops

both the forward and reverse reactions stop

the rate constants for the forward and reverse reactions are equal

A complete reaction is in which:

All the reactants convert into products

All the reactants do not convert into products

Half reactants convert into products

only 10% reactants convert into products

Which statement correctly describes an endothermic chemical reaction?

The products have higher potential energy than the reactants, and the ΔH is positive

The products have lower potential energy than the reactants, and the ΔH is positive

The products have lower potential energy than the reactants, and the ΔH is negative

The products have higher potential energy than the reactants, and the ΔH is negative

What is K c for the following reaction? 2 NO(g) + O 2 (g) ⇌ 2 NO 2 (g)

K c = [NO 2 ] 2 / [NO] 2 [O 2 ]

K c = [NO] 2 [O 2 ] / [NO 2 ] 2

Which of the following is TRUE for a system that is in dynamic equilibrium?

The forward reaction goes to 100% completion.

The reaction rate of the forward reaction approaches zero.

The concentration of products is equal to the concentration of the reactants.

Which of the following is TRUE about a chemical system in equilibrium?

Reaction rate remains stable as long as temperature and pressure are stable.

Temperature changes have no effect on reaction rate.

Addition of more reactants have no effect on reaction rate

Why does increased concentration increase the rate of reaction?

the frequency of collisions is increased

the activation energy is lowered

collisions occur with greater energy

Why does the rate of the reaction decrease over time?

As the reaction proceeds, a decrease in the concentration of reactants results in fewer successful collisions.

Exothermic reactions lose heat which cools the reaction which decreases reaction rate.

As the reaction proceeds, the concentration of the products results in fewer collisions

Not all molecules will react and some choose to stay in their present form

Equilibrium

Authored by Sally Glennon

Chemistry

11th - 12th Grade

NGSS covered

Used 15+ times

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80 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are the two factors to look for when determining if the reaction is at equilibrium?

Forward reaction rate is faster than the reverse and concentrations are equal

Forward and reverse reaction rates are equal and concentration is constant

Forward and revers reaction rates are equal and concentration is equal

Forward reaction rate is faster than the reverse and concentration is equal

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

This symbol indicates that a reaction is ____________

reversible

irreversible

Tags

NGSS.HS-PS1-6

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

When the rate of the forward reaction is equal to the rate of backward reaction, the system is said to be in

Dynamic Equilibrium

Chemical Balance

Chemical Constant

Chemical Reaction

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

At what time the reaction reached equilibrium?

t₁

t₂

t₃

t₄

Tags

NGSS.HS-PS1-6

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

It is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back.

reversible reaction

irreversible reaction

decomposition reaction

synthesis

Tags

NGSS.HS-PS1-6

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Identify the labels (a) and (b) on the graph.

a is concentration of reactants and b is the concentration of product

a is concentration of product and b is the concentration of reactant

a is the volume of reactants and b is the volume of product

a the mass of reactants and b is the mass of product

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Define chemical equilibrium.

A reaction is reversible.

The concentration of the reactants is equal to the concentration of the products.

The rate of a forward reaction is equal to the rate of the reverse reaction.

The reaction stops and no further change in concentration occurs.

Tags

NGSS.HS-PS1-6

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Equilibrium

What are the two factors to look for when determining if the reaction is at equilibrium?

This symbol indicates that a reaction is ____________

When the rate of the forward reaction is equal to the rate of backward reaction, the system is said to be in

At what time the reaction reached equilibrium?

It is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back.

Identify the labels (a) and (b) on the graph.

Define chemical equilibrium.

At what time (in seconds) is equilibrium established?

Which of the two graphs reaches equilibrium?

During equilibrium, the rates of the forward and the reverse reaction are ________

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