2.1 Thermochemistry

Question 1

What is meant by a ‘system’?

Answer 1

The chemicals involved in the reaction

Question 2

What is included in the ‘system’?

Answer 2

Reactants, products and intermediates (substances formed during the reaction but later convert into final products)

Question 3

What is meant by an open system?

Answer 3

A system that freely exchanges energy and matter with its surroundings

Question 4

What is meant by a closed system?

Answer 4

A system that exchanges only energy with its surroundings, not matter.

Question 5

What is meant by an isolated system?

Answer 5

A system that cannot exchange energy or matter with it surroundings

Question 6

What is meant by the surroundings?

Answer 6

Everything in contact with the surroundings, including the vessel, air in contact and stirring rods or thermometers.

Question 7

What is the point called where the system meets the surroundings?

Answer 7

The boundary

Question 8

What is meant by ‘energetics’ and what is an alternative term?

Answer 8

i) The study of the transfer energy between a chemical system and its surroundings
ii) thermochemistry