quiz 15

Question 1

Give an example of an alkali

Answer 1

sodium hydroxide

Question 2

Define acids in terms of of pH

Answer 2

A substance with a pH of less than 7

Question 3

Which substances can neutralise acids?

Answer 3

alkali and bases

Question 4

How can the concentration of an acid be increased?

Answer 4

reducing the volume of water

Question 5

complete the equation: metal oxide + acid —->

Answer 5

metal oxide + acid ——-> salt + water

Question 6

Describe the relationship between the concentration of an acid and its pH

Answer 6

As an acid increases in concentration, its pH decreases

Question 7

Name the salts formed by the 3 main laboratory acids.

Answer 7

Hydrochloric acid produces chlorides.
sulfuric acid produces sulfates
nitric acid produces nitrates

Question 8

Complete the equation: metal carbonate + acid
—->

Answer 8

metal carbonate + acid ——> salt+ water + carbon dioxide

Question 9

State the term used to describe the metal- containing the product of a reaction with an acid

Answer 9

A salt

Question 10

Give the equation that shows the reaction between H+ and OH- ions

Answer 10

H+ + OH- ——> H2O

Question 11

complete the equation: metal + acid —–>

Answer 11

metal + acid——-> salt + hydrogen

Question 12

Define strong acid

Answer 12

An acid which is completely ionised in aqueous solution

Question 13

Define an acid in terms of ions

Answer 13

A substance which release H+ ions in solution

Question 14

How can pH be measured in the laboratory?

Answer 14

With an indicator or pH probe

Question 15

Give an example of a base

Answer 15

Calcium oxide

Question 16

Describe the relationship between pH and concentration of H+ ions in a solution

Answer 16

As the concentration of H+ ions in a solution increases by a factor of 10, the pH decreases by one unit

Question 17

Which ions are always present in a solution of an alkali?

Answer 17

OH-

Question 18

Describe the relationship between the strength of an acid and its pH

Answer 18

As an acid increases in strength, its pH decreases

Question 19

Complete the equation: metal hydroxide + acid ——->

Answer 19

Metal hydroxide + acid ——-> salt + water

Question 20

State the pH of neutral solutions

Answer 20

7

Question 21

Define weak acid

Answer 21

An acid which is only partially ionised in aqueous solution

Question 22

Which ions always react together in a neutralisation reaction between acids and alkalis?

Answer 22

H+ and OH-

Question 23

Name 3 common laboratory acids and give their formulae

Answer 23

Hydrochloric acid, HCl(aq)

Sulfuric acid, H2SO4(aq)

Nitric acid, HNO3(aq)