4.7.5 Atoms into ions and ions into atoms

Question 1

Why is electrolysis an expensive way of extracting metals from their ores?

Answer 1

Requires a lot of heat and electrical energy.

Question 2

What is the test and positive result for hydrogen?

Answer 2

Lit spill, pop

Question 3

What is the test and positive result for oxygen?

Answer 3

Glowing spill, relight

Question 4

What is the test and positive result for chlorine?

Answer 4

Damp blue litmus, bleaches

Question 5

In terms of electrons, what is oxidation?

Answer 5

Loss of electrons

Question 6

In terms of electrons, what is reduction?

Answer 6

Gain of electrons

Question 7

What type of ions do metals form?

Answer 7

Positive

Question 8

What type of ions do non-metals form?

Answer 8

Negative

Question 9

What is the correct order of reactivity - copper, lithium, magnesium, sodium?

Answer 9

Lithium, sodium, magnesium, copper

Question 10

Which electrode do metal ions move to during electrolysis?

Answer 10

Cathode

Question 11

What is the positive electrode called?

Answer 11

Anode

Question 12

What is the negative electrode called?

Answer 12

Cathode

Question 13

Which type of compounds can be electrolysed?

Answer 13

Molten or dissolved ionic compounds

Question 14

Which electrode do non-metal ions move to during electrolysis?

Answer 14

Anode

Question 15

What process occurs at the anode?

Answer 15

Oxidation

Question 16

What process occurs at the cathode?

Answer 16

Reduction

Question 17

What is a displacement reaction?

Answer 17

More reactive metal displaces a less reactive metal from a compound

Question 18

What is an electrolyte?

Answer 18

The molten or dissolved ionic substance

Question 19

What are the 2 products that can be discharged at the anode?

Answer 19

Halogen gas or oxygen gas

Question 20

What are the 2 products that can be discharged at the cathode?

Answer 20

Metal or hydrogen gas