Electrolysis

Question 1

Electrolysis

Answer 1

The decomposition of ionic substances into simpler substances by passing an electric current through them

Question 2

Electrolytes

Answer 2

Liquids that are able to conduct electricity with free moving ions

Question 3

Can covalent compounds conduct electricity + why?

Answer 3

No + They have no ions (free charged electrons)

Question 4

Can ionic compounds conduct electricity + why?

Answer 4

Yes + They have ions

Question 5

Cations

Answer 5

Metal ions with a positive charge that move towards the cathode

Question 6

Anions

Answer 6

Non-metal ions with a negative charge that move towards the anode

Question 7

OILRIG

Answer 7

Oxidation is Loss
Reduction is Gain

(Of electrons)

Question 8

Cathode

Answer 8

The negative electrode

Question 9

Anode

Answer 9

The positive electrode

Question 10

Which electrode does reduction happen at?

Answer 10

Cathode

Question 11

Which electrode does oxidation happen at?

Answer 11

Anode

Question 12

Electrode

Answer 12

The material placed into the electrolyte, connected to a power supply

Question 13

Which metals form ions more easily?

Answer 13

Metals that are more reactive

Question 14

Cell

Answer 14

A store of chemical energy that can provide electrical energy

Question 15

Electricity

Answer 15

A flow of electrons

Question 16

What does a chemical cell produce until one of the reactants is used up?

Answer 16

Voltage

Question 17

In a hydrogen-oxygen fuel cell, which two substances are used to produce voltage?

Answer 17

Hydrogen and oxygen

Question 18

What is the only product of a hydrogen-oxygen fuel cell?

Answer 18

Water

Question 19

What are the advantages of hydrogen fuel cells compared to power stations or batteries?

Answer 19

Much more efficient at producing electricity

Question 20

What can increase the efficiency of hydrogen fuel cells to greater than 80%?

Answer 20

Using the heat produced

Question 21

What is the overall reaction in a hydrogen-oxygen fuel cell?

Answer 21

2H2 + O2 → 2H2O

Question 22

True or False: The reaction in a fuel cell produces harmful pollutants.

Answer 22

False

Question 23

List three conventional pollutants that fuel cell vehicles do not produce.

Answer 23

• Greenhouse gases
• Nitrogen oxides
• Sulfur dioxide

Question 24

What are the only by-products of a fuel cell?

Answer 24

Water and heat

Question 25

What is a major advantage of fuel cells in urban areas?

Answer 25

Reduction of air pollution from traffic

Question 26

Fill in the blank: Fuel cells do not require any heavy machinery, such as _______.

Answer 26

Turbines or generators

Question 27

What is a significant environmental benefit of using fuel cells instead of traditional batteries?

Answer 27

Replacing highly toxic metal compounds

Question 28

What type of energy loss is minimized in fuel cells due to the absence of moving parts?

Answer 28

Loss through friction