7.1 The Characteristic Properties of Acids & Bases

Question 1

When acids are added to water what do they form?

Answer 1

Hydrogen / H+ ions

Question 2

Which metals will react with dilute acids?

Answer 2

Only metals that are above hydrogen in the reactivity series

Question 3

acid + metal → ?

Answer 3

salt + hydrogen

Question 4

What is a neutralisation reaction?

Answer 4

When an acid reacts with a base

Question 5

acid + base → ?

Answer 5

salt + water

Question 6

acid + metal carbonate → ?

Answer 6

salt + carbon dioxide + water

Question 7

Colour of litmus paper in an acid?

Answer 7

Red

Question 8

Colour of litmus paper in an an alkali?

Answer 8

Blue

Question 9

Color of Thymolphthalein in an acid?

Answer 9

Colourless

Question 10

Color of Thymolphthalein in an alkali?

Answer 10

Blue

Question 11

Color of Methyl orange in an alkali?

Answer 11

Yellow

Question 12

Color of Methyl orange in an acid?

Answer 12

Red

Question 13

What is the pH of an acid?

Answer 13

Below 7

Question 14

What is the pH of an alkali/base

Answer 14

Above 7

Question 15

What is an alkali?

Answer 15

A base which is water-soluble

Question 16

What are bases?

Answer 16

Substances which can neutralise an acid,forming a salt and water

Question 17

When alkalis are added to water what do they form?

Answer 17

Hydroxide / OH- ions

Question 18

Define an acid

Answer 18

A proton donor that forms H+ ions in water

Question 19

Define an alkali

Answer 19

A proton acceptor that forms OH- ions in water

Question 20

What is the pH of a strong acid?

Answer 20

0-2

Question 21

What is the pH of a weak acid?

Answer 21

3-6

Question 22

What is the pH of a weak alkali?

Answer 22

8-11

Question 23

What is the pH of a strong alkali?

Answer 23

12-14

Question 24

Define a strong acid

Answer 24

Completely dissociate (or ionise) in water

Question 25

Define a weak acid

Answer 25

Partially dissociate (or ionise) in water

Question 26

Define an oxide

Answer 26

Compounds made from one or more atoms of oxygen combined with one other element

Question 27

On the periodic table where are acidic oxides found?

Answer 27

The right side

Question 28

On the periodic table where are basic oxides found?

Answer 28

The left side

Question 29

What are acidic oxides?

Answer 29

A non-metal element combined with oxygen

Question 30

What are basic oxides?

Answer 30

A metal element combined with oxygen

Question 31

What is an amphoteric oxide?

Answer 31

An oxide that can behave as either acidic or basic depending on the other reactant

Question 32

Name two amphoteric oxides

Answer 32

Zinc Oxide (ZnO) & Aluminimum Oxide (Al₂O₃)