C4-

Question 1

which values are acidic

Answer 1

anything less than 7

Question 2

what is a strong acid

Answer 2

An acid which completely ionises in aqueous solution

Question 3

what do we call ions that arent involved in a chemical reaction

Answer 3

spectator ions

Question 4

what is a base

Answer 4

a substance that can neutralise an acid

Question 5

what PH values are alkaline

Answer 5

Any PH greater than 7

Question 6

what ions do alkali form in water

Answer 6

OH−

Question 7

is the ionisation of strong acids reversible

Answer 7

no it is not

Question 8

whats oxidation in terms of electrons

Answer 8

oxidation is the loss of electrons

Question 9

why should the electrodes be inert

Answer 9

So that they dont react with the electrolyte and dissolve away

Question 10

which metals can be reduced with carbon(3)

Answer 10

Zibc
iron
copper

Question 11

what is the general word equation for the reaction between an acid and a metal hydroxide

Answer 11

Acid + metal hydroxide –> salt + water

Question 12

name 3 strong acids

Answer 12

HCL
nitric acid
sulphuric acid

Question 13

what is reduction in terms of electrons

Answer 13

reduction is the gain of electrons

Question 14

what ore is aluminum extracted from via electrolysis

Answer 14

bauxite

Question 15

describe how metal ores can be reduced using carbon

Answer 15

1. react the metal ore with carbon
2. carbon will displace the metal as it is more reactive

Question 16

what is the ionic equation for a neutralisation reaction

Answer 16

H +(aq) + OH −(aq) → H 2O(ℓ)

Question 17

what is a weak acid?

Answer 17

An acid which only partially ionises in aqueous solution

Question 18

what happens to positive ions during electrolysis

Answer 18

1, they are attracted to the cathode
2. they gain electrons
3.this means they have been reduced

Question 19

why is cryolite used in the electrolysis of aluminium oxide

Answer 19

aluminum oxide has a very high melting point so it would be very expensive to melt

cryolite lowers the melting point which reduces the cost of the process

Question 20

in electrolysis which two ions are present from the water molecules

Answer 20

h+ ions and OH- ions

Question 21

what is a good indicator to use for titration between a strong and weak acid

Answer 21

Methyl orange

Question 22

what is the general formula for a reaction between an acid and a metal carbonate

Answer 22

acid + metal carbonate –> salt water + carbon dioxide

Question 23

general formula for a reaction between an acid and a metal

Answer 23

acid + metal –> salt + hydrogen