C2.5 Salts and Electrolysis Flashcards Preview

GCSE Chemistry AQA > C2.5 Salts and Electrolysis > Flashcards

Flashcards in C2.5 Salts and Electrolysis Deck (32):
1

Acids ionise in water to produce....

hydrogen ions H+

2

Alkalis ionise in water to produce....

Hydroxide ions, OH-

3

What is a base?

A substance that neutralises an acid

4

Suggest the pH of hydrochloric acid

1-4

5

Suggest the pH of sodium hydroxide

10-14

6

Acid + Metal =

Salt + Hydrogen
(MASH)

7

Acid + Metal Oxide =

Salt + Water

8

Acid + Alkali =

Salt + Water

9

Acid + Metal Carbonate =

Salt + carbon dioxide + water

10

Magnesium + Hydrochloric acid =

Magnesium Chloride + Hydrogen

11

Sodium Hydroxide + Nitric acid =

Sodium nitrate + water

12

Copper Oxide + sulphuric acid =

Copper sulphate + water

13

Calcium Carbonate + Hydrochloric acid =

Calcium chloride + Carbon Dioxide + water

14

List the steps to make copper sulphate crystals

Warm sulphuric acid
Add copper oxide until it is in excess
Filter the excess copper oxide
Evaporate the water

15

Lead nitrate + Potassium Iodide =

Lead iodide + Potassium nitrate

16

How can a precipitate, such as lead iodide, be removed from a solution?

Filter it

17

What is the positive electrode in electrolysis called?

Anode
(PANic)

18

What is the negative electrode in electrolysis called?

Cathode
(PANiC)

19

In the electrolysis of lead iodide, why does the lead iodide have to be melted?

so the ions can move
and carry the charge

20

In the electrolysis of lead iodide, which electrode do the lead ions go to?

Cathode

21

Explain why copper ions go to the cathode

The cathode is negative
Copper ions are positive
Opposite charges attract

22

Explain why chloride ions go to the anode

The anode is positive
Chloride ions are negative
Opposite charges attract

23

Finish the following equation
Pb2+ + __ e- --> Pb

Pb2+ + 2e- --> Pb

24

Finish the following equation
_Cl- ---> Cl2 + __e-

2Cl- ---> Cl2 + 2e-

25

How does a copper ion, Cu2+, become a copper ion?

By gaining two electrons

26

What is the aluminium ore called?

Bauxite

27

Why is molten cryolite added to the bauxite?

To reduce the melting point
so less energy is required

28

Name the three products of the electrolysis of brine

Sodium hydroxide
Hydrogen
Chlorine
(CatHy's AnCls)

29

The loss of electrons is called

Oxidation
(OILRIG)

30

The gain of electrons is called

Reduction
(OILRIG)

31

Why is hydrogen produced instead of sodium in the electrolysis of brine?

Sodium is more reactive than hydrogen

32

Why is electroplating used?

To make objects look better
To protect the metal from corroding
It's cheaper than using the pure metal