Acids and bases

Question 1

Define an acid

Answer 1

A proton donor

A supplier of H+ ions

Question 2

Define a base

Answer 2

A proton acceptor

A source of OH- ions

Question 3

State the difference between an alkali and a base.

Answer 3

Alkalis are soluble bases.

All alkalis are bases but not all bases are alkalis.

Question 4

What colour does red/blue litmus (paper) turn in hydrochloric acid

Answer 4

Red

Question 5

What colour does red/ blue litmus (paper) turn in a hydroxide solution.

Answer 5

Blue

Question 6

What colour does phenolphthalein turn in hydrochloric acid.

Answer 6

Colourless

Question 7

What colour would phenolphthalein turn in hydroxide solution.

Answer 7

Bright pink

Question 8

What colour does methyl orange turn in hydrochloric acid

Answer 8

Red

Question 9

What colour does methyl orange turn in hydroxide solution

Answer 9

Yellow

Question 10

What colour does UI solution turn in hydrochloric acid

Answer 10

Red

Question 11

What colour does UI turn in hydroxide solution.

Answer 11

Blue

Question 12

When do we use a paper indicator instead of a liquid indicator.

Answer 12

When testing a gas

Question 13

What is an acid a source of

Answer 13

H+ ions

Question 14

What is a base a source of

Answer 14

OH- ions

Question 15

What is an acid in terms of protons

Answer 15

A proton donor

Question 16

What is a base in terms of protons

Answer 16

A proton acceptor

Question 17

Ammonia + hydrochloric acid —>

Answer 17

Ammonium chloride (neutral)

Question 18

Is ammonia an alkali or an acid?

Answer 18

An acid

Question 19

Metal + acid —>

Answer 19

Salt + hydrogen

Question 20

What would you observe when reacting magnesium and hydrochloric acid?

Answer 20

Effervescence

Question 21

What gas is produced when reacting magnesium and hydrochloric acid

Answer 21

Hydrogen

Question 22

Metal oxide + acid —>

Answer 22

Salt + water

Question 23

Copper oxide + hydrochloric acid

Answer 23

Copper chloride + water

Question 24

Sodium hydroxide + hydrochloric acid

Answer 24

Sodium chloride + water

Question 25

Acid + metal carbonate

Answer 25

Salt + water + co2

Question 26

Acid + metal hydroxide

Answer 26

Salt + water

Question 27

What is definitely soluble

Answer 27

Sodium, potassium, ammonium compounds Nitrates Chlorides apart from silver and lead(II) Sulphates apart from barium, calcium and lead (II)

Question 28

What is definitely insoluble

Answer 28

Carbonates apart from sodium, potassium and ammonium | Hydroxides apart from ================ and calcium

Question 29

When non metals burn in oxygen, ———— form.

Answer 29

Non metal oxides

Question 30

When non metal oxides are dissolved in water they turn UI from ———- to ———

Answer 30

Green to red

Question 31

Non metal oxides dissolved in water are acidic | True or false

Answer 31

True

Question 32

When metals burn in oxygen ———— form.

Answer 32

Metal oxides

Question 33

Metal oxides when dissolved in water turn UI from green to ———

Answer 33

Blue

Question 34

State the formula for Hydrochloric acid

Answer 34

HCl

Question 35

Formula for Sulfuric acid

Answer 35

H2SO4

Question 36

Formula for nitric acid

Answer 36

HNO3

Question 37

Formula and charge of carbonate

Answer 37

Co3 -2

Question 38

Formula and charge for sulfate

Answer 38

SO4 -2

Question 39

Formula and charge for nitrate

Answer 39

No3

Question 40

Formula and charge for hydroxide

Answer 40

OH -1

Question 41

Formula and charge of ammonium

Answer 41

NH4

Question 42

Charge of Ag (silver)

Answer 42

+1

Question 43

Charge for Zn (zinc).

Answer 43

+2

Question 44

Charge of Pb (lead)

Answer 44

+2

Question 45

Give two definitions of an acid

Answer 45

1. An acid reacts with a base to make a neutral solution and dissociates with water to form H+ ions 2. An acid is a proton donor

Question 46

Give two definitions of a base

Answer 46

1. A substance that will react with an acid to form a neutral solution and will increase the concentration of OH ions in water when dissolved in it. 2. A proton acceptor

Question 47

H+ + OH- ———>

Answer 47

H2O

Question 48

Is silver chloride (in)soluble?

Answer 48

Insoluble

Question 49

Is magnesium nitrate soluble.

Answer 49

Yes

Question 50

Is iron nitrate soluble

Answer 50

Yes

Question 51

State the observations of sodium reacting with oxygen

Answer 51

An intense yellow flame and a white solid being produced

Question 52

State the observations when magnesium reacts with oxygen

Answer 52

A bright white flame and a white solid being produced

Question 53

State the observations when sulphur reacts with oxygen

Answer 53

A pale blue flame and white fumes being produced

Question 54

State the observations of when carbon reacts with oxygen

Answer 54

Glowed red

Question 55

What colour does carbon dioxide turn in UI

Answer 55

Yellow

Question 56

What colour does sulphur dioxide turn in UI

Answer 56

Red

Question 57

What colour does magnesium oxide turn in UI

Answer 57

Blue

Question 58

What colour does sodium oxide turn in UI

Answer 58

Purple