Chemical Equilibrium

Question 1

What does k represent?

Answer 1

The value of an equilibrium constant indicates the position of equilibrium

Question 2

What have a value of 1 in equilibrium expression

Answer 2

The concentrations of pure solids and pure liquids

Question 3

What is k dependent and independent of?

Answer 3

dependent of temperature
independent of concentration and pressure

Question 4

For endothermic reactions, a rise in temperature causes?

Answer 4

an increase in k and the yield of the product is increased

Question 5

For exothermic reactions, a rise in temperature causes?

Answer 5

a decrease in k and the yield of the product is decreased

Question 6

Water equilibrium?

Answer 6

H2O + H20 arrow OH- + H30+

Question 7

Word to describe water?

Answer 7

amphoteric

Question 8

The dissociation constant?

Answer 8

Kw

Question 9

At 25°C the value of Kw is approximately?:

Answer 9

1 × 10-14

Question 10

The Brønsted-Lowry definitions of acids and bases state?

Answer 10

an acid is a proton donor and
a base is a proton acceptor

Question 11

What is a strong acids and strong bases?

Answer 11

completely dissociated into ions in aqueous solution

Question 12

What is weak acids and weak bases?

Answer 12

only partially dissociated into ions in aqueous solution

Question 13

Examples of strong acids include?

Answer 13

hydrochloric acid, sulfuric acid and nitric acid

Question 14

Examples of weak acids?

Answer 14

Ethanoic acid, carbonic acid and sulfurous acid

Question 15

Strong bases?

Answer 15

Solutions of metal hydroxides

Question 16

Example of weak bases?

Answer 16

Ammonia and amines

Question 17

acid dissociation constant?

Answer 17

Ka

Question 18

A soluble salt of a strong acid and a strong base dissolves in water to produce?

Answer 18

a neutral solution

Question 19

The first part of the name of a salt identifies? The second part of the name of a salt identifies?

Answer 19

alkali/base was used to make the salt and the acid used to make the salt respectively

Question 20

A buffer contains what?

Answer 20

a weak acid/base and a salt

Question 21

acid indicator dissociation constant?

Answer 21

kin

Question 22

the colour of an acid indicator is distinctly different from?

Answer 22

conjugate base

Question 23

The colour of the indicator is determined by?

Answer 23

the ratio [Hin] to [In-]

Question 24

The theoretical point at which colour change occurs is when?

Answer 24

[H30+] = kin

Question 25

The colour change is assumed to be distinguishable when?

Answer 25

[Hin] and [In-] differ by a factor ten

Question 26

The pH range over which a colour change occurs can be estimated by the expression

Answer 26

pH= pkin +/- 1