Mole concept, electrolysis, endo and exotic thermic

Question 1

Define Mole?

Answer 1

The mole is the SI unit of the amount of substance.

Question 2

What is the avogadro constant?

Answer 2

Is the number of particles in one Mole of any substances. It is
6.02214076×10²³.
- It is denoted by NA

Question 3

Define electrolysis?

Answer 3

It is the breakdown of Ionic compounds in molten or in aqueous by the passage of electricity.

Question 4

Define electrode?

Answer 4

It is a rod of metal through which an electric current flows into or out of an electrolyte.
- It is made up of graphite or platinum (inert as their u reactive)

Question 5

Define electrolyte?

Answer 5

Are the conducting solutions.

Question 6

Define anode?

Answer 6

It is the positive electrode connected to the positive terminal of the battery

Question 7

Define cathode?

Answer 7

It’s is the negative electrode connected to the negative terminal of the battery.

Question 8

Define exothermic reaction?

Answer 8

It is where the thermal energy is transferred to the surroundings to increase the temperature of the surroundings.
E. G : combustion, oxidation, neutralisation.

Question 9

Define endothermic reactions?

Answer 9

It is where thermal energy is taken in from the surroundings so the temperature decreases.
E. G: electrolysis, thermal decomposition, first stages of photosynthesis, cold packs.