C4

Question 1

What type of reaction is gaining oxygen?

Answer 1

Oxidation reaction

Question 2

What happens when you react metals with oxygen?

Answer 2

-Form metal oxide
-Oxidisation reaction occurs

Question 3

What is the displacement reaction?

Answer 3

A more reactive element will push out (displace)a less reactive element from a compound (displacement reaction)

Question 4

What does oilrig show?

Answer 4

Oxidisation is loss of electrons
Reduction is gain of electrons

Question 5

What do acids produce in an aqueous solution?

Answer 5

Hydrogen ions (H+)

Question 6

What are bases?

Answer 6

Chemicals that can neutralise acid producing a salt and a water

Question 7

What is an alkali?

Answer 7

The base which is soluble in water

Question 8

What do alkalis produce in aqueous solution?

Answer 8

Hydroxide ions (OH-)

Question 9

What pH are acids?

Answer 9

0-6

Question 10

What pH are alkalines?

Answer 10

8-14

Question 11

What can we use to determine the pH?

Answer 11

-PH probe
-Universal indicator

Question 12

What is the neutralisation equation?

Answer 12

(H+)+(OH-) -> H20

Question 13

What do you all acids contain?

Answer 13

Hydrogen

Question 14

What salt is produced in hydrochloric acid and sulphuric acid?

Answer 14

-Hydrochloric acid produces -chloride
-sulphuric acid produces -sulphate

Question 15

What happens when we react an acid with a base or alkali?

Answer 15

We make salt and water

Question 16

What is a salt?

Answer 16

-Salt contains positive ions which come from base or alkali
-Salt also contain a negative iron which come from acid

Question 17

What happens when An acid reacts with a metal carbonate?

Answer 17

They make salt, water and carbon dioxide

Question 18

What is another word for splitting acids?

Answer 18

Ionising

Question 19

What are strong acids and what are some examples?

Answer 19

Strong acids fully ionise in an aqueous solution
Some examples include hydrochloric acid, sulphuric acid, and nitric acid

Question 20

What are weak acids and what are some examples?

Answer 20

Weak acids partially ionise in an aqueous solution
Carbonic acid Ethanoic acid and citric acid

Question 21

What is an order of magnitude?

Answer 21

Where a pH has a 10 times greater concentration of hydrogen plus (H+)

Question 22

What does the concentration of acid tell us?

Answer 22

The concentration of acid in a given volume of solution

Question 23

Can solid ionic, compounds, conduct, electricity

Answer 23

No ions are locked in place and can’t move

Question 24

When can an ionic compounds conduct electricity?

Answer 24

When is melted or dissolved in water and the ions are free to move (electrolytes)

Question 25

What is the positive electrode in electrolysis?

Answer 25

The anode and it lacks electrons

Question 26

What is the negative electrode in electrolysis?

Answer 26

Cathode and it’s covered with electrons

Question 27

What occurs at the cathode and anode during electrolysis?

Answer 27

The Anode loses electrons (oxidation) the cathode gains electrons (reduction)

Question 28

What is a cryolite used for in electrolysis?

Answer 28

Lowers the melting point Reduces the amount of energy required Saves money

Question 29

What is the half equation of reduction in aluminium oxide?

Answer 29

Al(3) + 3e(-) -> Al

Question 30

What is the half equation of oxidisation in aluminium oxide?

Answer 30

O(2-) -> O + 2e(-)

Question 31

Why is electrolysis expensive?

Answer 31

Melting, the compounds requires a great amount of energy a lot of energy is required to produce the electric current

Question 32

When is hydrogen produced at the cathode?

Answer 32

If the metal is more reactive than hydrogen, hydrogen is produced

Question 33

What gas do you make at the anode?

Answer 33

Oxygen gas is produced, apart from when the halogen is present, then the halogen is produced

Question 34

explain why the positive carbon electrode must be continuously replaced

Answer 34

-at high temp, oxygen reacts with electrode -electrode burns and wears away -to produce carbon dioxide