Chemical Equilibrium

Question 1

The reaction can be started from the reactant side only

Answer 1

IRREVERSIBLE REACTION

Question 2

Only the forward reaction takes place

Answer 2

IRREVERSIBLE REACTION

Question 3

Represented by a normal arrow
→

Answer 3

IRREVERSIBLE REACTION

Question 4

The reaction proceeds to completion

Answer 4

IRREVERSIBLE REACTION

Question 5

The reaction can be started from either side

Answer 5

REVERSIBLE REACTION

Question 6

Forward and backward reactions are in equilibrium

Answer 6

REVERSIBLE REACTION

Question 7

Represented by an equilibrium arrow
⇌

Answer 7

REVERSIBLE REACTION

Question 8

The reaction is never complete

Answer 8

REVERSIBLE REACTION

Question 9

Properties such as concentrations of reactants and products, pressure and color are ___________.

Answer 9

constant

Question 10

A system in equilibrium is a ____________ system

Answer 10

Closed

Question 11

The rate of the forward reaction equals the rate of the ___________ reaction

Answer 11

reverse

Question 12

Equilibrium can be approached from the _______________ or ______________ direction and the final equilibrium position is the same

Answer 12

forward or reverse

Question 13

Involves reactants and
products that are
present in one phase

Answer 13

Homogeneous

Question 14

Involves reactants and
products that are
present in different
phase

Answer 14

Heterogeneous

Question 15

True or False
aA + bB ⇌ cC + dD

The equilibrium constant for this reaction is defined as the ratio of the concentrations (partial pressures) of the products divided by the concentration (partial pressures) of the reactants, at equilibrium, raised to their stoichiometric coefficients.

Answer 15

True

Question 16

Kc
The symbol c in Kc indicates that the units for the reactants and products are those of ______________.

Answer 16

molar concentration

Question 17

Kp
For reactions involving gases, the equilibrium constant is often expressed in terms of __________________________ rather than their concentrations.

Answer 17

partial pressures

Question 18

In writing equilibrium, constant expression for heterogeneous reactions involving gases and a solid or a liquid, the concentration of pure liquids and pure solids are ____________________ because they have constant concentrations.

Answer 18

not included

Question 19

can be used to measure the extent of a
chemical reaction. This quantity
is also used to determine how
far from equilibrium the chemical
reaction is.

Answer 19

REACTION QUOTIENT

Question 20

Q < K

What direction?

Answer 20

Favors the forward direction

Question 21

Q = K

What direction?

Answer 21

Equilibrium

Question 22

Q > K

What direction?

Answer 22

Favors the reverse direction

Question 23

What Law?

If a chemical system at
equilibrium is disturbed or
stressed, the system will react in
the direction that counteracts the
disturbance or relieves the
stress.

Answer 23

LE CHATELIER’S PRINCIPLE

Question 24

Addition of reactant drives
the equilibrium to the ______

Answer 24

right

Question 25

Addition of product drives
the equilibrium to the ______

Answer 25

left

Question 26

Adding more reactants
Favors the __________ reaction

Answer 26

forward

Question 27

Adding more products
Favors the ________ reaction

Answer 27

reverse

Question 28

Removing a reactants Favors the ___________ reaction

Answer 28

reverse

Question 29

Removing a product Favors the ____________ reaction

Answer 29

forward

Question 30

The reaction can be shifted
forward or backward by
changing the ______________.

Answer 30

pressure

Question 31

Decrease the number of moles to
decrease ______________

Answer 31

pressure

Question 32

Increase in pressure Equilibrium favors the side that has ____________ moles

Answer 32

fewer

Question 33

Decrease in pressure Equilibrium favors the side that has __________ moles

Answer 33

more

Question 34

increases the rate of
chemical reactions. It increases
the rate of the forward reaction
as well as the backward reaction
to the same extent.

Answer 34

CATALYST