Electrolysis

Question 1

A lithium ion, Li+, has two electrons. How can you turn it back into an atom?

Answer 1

If it gains 1 electron

Question 2

To balance a + you have to?

Answer 2

Gain electrons

Question 3

To balance a - you have to?

Answer 3

Lose electrons

Question 4

How does the Br- ion become an atom.

Answer 4

By losing one electron

Question 5

Oxidation takes place at the?

Answer 5

Anode

Question 6

Reduction takes place at the?

Answer 6

Cathode

Question 7

Ions of low reactivity are discharged instead of?

Answer 7

H+

Question 8

H+ is discharged instead of?

Answer 8

High reactivity metals

Question 9

Halide ions are discharged instead of?

Answer 9

OH- ions

Question 10

OH- ions are discharged instead of?

Answer 10

Other negative ions

Question 11

These negative ions include.

Answer 11

NO3- SO42- CO32-

Question 12

When in a solution, all ions will contain?

Answer 12

OH- and H+

Question 13

Only thing that make solutions acidic is?

Answer 13

H+

Question 14

Only thing that makes solutions alkaline is?

Answer 14

OH-

Question 15

Explain test for hydrogen?

Answer 15

The squeaky pop test. Put a lit splint at the end of the test tube and listen for a squeaky pop.

Question 16

Explain test for oxygen.

Answer 16

Put a blown out splint into a test tube, if it relights then there is oxygen produced.

Question 17

Methyl orange goes which colours in acid and in alkali?

Answer 17

It goes red in acid and yellow in alkali

Question 18

What colours does phenophalein go in acid and alkali?

Answer 18

It goes colourless in acid and pink in alkali.

Question 19

What piece of apparatus should be used to measure acid for titration?

Answer 19

Glass pipette

Question 20

What is the nam given to the method for finding the amount of acid needed to neutralise the solution?

Answer 20

Titration

Question 21

If you add litmus paper to chlorine it goes?

Answer 21

Red and then it bleaches white.

Question 22

What is electrolysis?

Answer 22

Electrolysis is the breaking down of a substance using electricity.

Question 23

What is oxidation in terms of electrons?

Answer 23

Loss of electrons

Question 24

What is reduction in terms of electrons?

Answer 24

Gain of electrons

Question 25

Where do the positive ions go to.

Answer 25

The cathode

Question 26

What are the positive and negative ions called?

Answer 26

Cations and anions

Question 27

Where do the negative ions in the electrolyte move toward.

Answer 27

The anode

Question 28

Why can molten ionic compounds be electrolysed.

Answer 28

Because the ions can move freely.

Question 29

Molten ionic compounds are broken up into?

Answer 29

Elements.

Question 30

Write a half equation for molten lead bromide

Answer 30

Pb2+ +2e- =Pb

2Br- = Br2 + 2e-