Electrolysis Flashcards Preview

Chemistry GCSE > Electrolysis > Flashcards

Flashcards in Electrolysis Deck (13):
1

What is electrolysis?

the process of breaking down an ionic substance using an electric current

2

Which compounds will undergo electrolysis and why?

ionic -> contain charged ions which are free to move in molten/liquid solutions

3

what will be made at the anode and cathode in electrolysis of a solution?

-least reactive substance made
-anode (+), halogen (Cl2, Br2, I2) or O2
-cathode (-), H2, Cu, Ag, Au, Pt

4

what is the 1/2 equation for oxygen?

4OH^- -> O2 + 2H2O + 4e^-

5

in electroplating what are the anode and cathode made of?
and what is the electolite?

anode->plating material
cathode -> object to be plated
Electrolyte -> solution of anode

6

why do we electro plate things?

-more attractive
-protection from corrosion
-save money
-increase hardness

7

what is sodium chloride made up of?

chlorine, hydrogen, sodium hydroxide (bleach anad HCl)

8

what can be made from chlorine
. . . .. . . . . ......................... hydrogen

Chlorine - bleach, hydrochloric acide
hydrogen - hydrochloric acid

9

what is the use of chlorine?

drugs, sterilise water (kills bacteria)

10

what is the use of bleach?

water treatment

11

what is the use of hydrochloric acid?

water treatment, cleaning products

12

what is the use of hydrogen?

margarine

13

what is the use of sodium hydroxide?

water treatment, purify petrol and gas