chemistry chapter 7

Question 1

what is electrolysis

Answer 1

electrolysis is the decomposition of an ionic compound, when molten or in aqueous solution by the passage of an electric current. it can also breakdown a covalent compound such as water using electricity

Question 2

what takes place in the electrolyte cell

Answer 2

electrolysis is important for extracting pure elements from compounds. it takes place in an electrolyte cell

Question 2

why is water a poor conductor

Answer 2

Water is very poor conductor because it is a covalent compound and only minute
amounts of it ionises to form hydrogen and hydroxide ions, so water it is not an
effective electrolyte

Question 2

what are the parts of an electrolytic cell

Answer 2

the electrolytic cell works like like an electrical circuit and has these main components - a battery electrolyte and an electrodes

Question 2

What makes up a circuit in cells – batteries or electrolysis

Answer 2

• All metals, non–metal carbon. This conduction involves the movement of free or delocalised electrons.
• Any compound, molten or dissolved in solution, in which the liquid contains free
  moving ions is called an electrolyte and can conduct an electrical current.

Question 3

how does electrolysis work in the external circuit

Answer 3

during electrolysis, electrons flow from the positive terminal to the negative terminal of the battery

Question 4

how does electrolysis work at the anode

Answer 4

• anions move to the anode
• anions lose electrons at the anode
• oxidation occurs at the anode

Question 5

how does electrolysis work at the cathode

Answer 5

• cations move to the cathode
• cations gain electrons at the cathode
• reduction occurs at the cathode

Question 6

what happens to the ions at the electrodes

Answer 6

• cations (positive ions) gain electrons at the negatively charged cathode. this is reduction.
• anions (negative ions) lose electrons at the positively charged anode. this is oxidation

Question 6

how does electrolysis work within the electrolyte

Answer 6

during electrolysis, the flow of the ions towards the electrodes causes the flow of electric current through the electrolyte

Question 7

what stands for OIL RIG

Answer 7

OIL- Oxidation Is Loss of electrons

RIG- Reduction Is Gain of electrons

Question 8

what is a binary compound

Answer 8

a binary compound containing only two elements, usually a metal cation, and a non metal anion

Question 8

what is an example of the electrolysis of molten ionic compounds

Answer 8

electrolysis of molten lead bromide

Question 9

what happens during electrolysis of molten lead bromide