electrolysis practical

Question 1

what is electrolyisis

Answer 1

breakdown of a substance using electricity

Question 2

what is an electrolyte

Answer 2

a liquid containing free noving ions which is broken down by electricity during electrolyisis

Question 3

for the electrolyisis of an aquatic qhy is it able to conduct electricity

Answer 3

solution contains ions which are free to move

Question 4

what are electrodes made from

Answer 4

graphite

Question 5

when is a metal formed wt the cathode during electrolyiss of an aquatic

Answer 5

when the metal is more reactive than hydrogen

Question 6

which metals are more reactive than hydrogen

Answer 6

potassium, sodium, calcium, magnesium, aluminium, zinc, iton, tin, lead

Question 7

which metals are less reactive than hydrogen

Answer 7

copper, soliver, gold

Question 8

what would be formed at the cathode if the solution contained cooper

Answer 8

copper

Question 9

what woukd be formed at the cathode if any metal except copper, silver, gold were in the solution

Answer 9

hydrogen

Question 10

why would a solution containing copper appear to fade in colour during electrolysis

Answer 10

the copper ions which give the solution its colour have moved to the cathode and formed copper metal, there are fewer copper ions in the solution and so the colour will fade

Question 11

why would solutions containing any metal apart from copper, silver and gold not appear ti fade in colour over time

Answer 11

the metal ions are more reactive than hydrogen and so are not removed from the solution

Question 12

what will form at the anode if the negative ion is chloride

Answer 12

chlorine

Question 13

what will form at the anode if the negative ion is bromide

Answer 13

bromine

Question 14

what will form at the anode if the negative ion is iodide

Answer 14

iodine

Question 15

what will form at the anode if the negative ion is nitrate

Answer 15

oxygen

Question 16

what will form at the anode if the negative ion is sulfate

Answer 16

oxygen

Question 17

when dies oxygen form at the anode during electrolysis of an aq

Answer 17

if the negative ion is not a group 7 halide

Question 18

if yiu are asked to collect a gas furing electrolyisis why would you not use a test tube

Answer 18

they dont have a scale so they cant be used to measure volume

Question 19

if you are asked to collect a gas during electrolysis what should you use to collect it

Answer 19

small measuring cylinder

Question 20

if you are investigating a hypothesis for electrolyiss what are the possible variables IV and CV

Answer 20

the chemicals in the solution, volume of pure water, concentration of the solution, volume of the solution, distance between electrodes, material of electrodes, same depth of electrodes in the solution, constant power supply, amount of time solution is stirred