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)

Question 24

What is the general pattern during neutralisation reactions

Answer 24

combine negative ion from the acid with the positive ion from the base to form a salt