22.4 Entropy

Question 1

what is entropy?

Answer 1

measure of the dispersal of energy within the chemicals in a chemical system

Question 2

what is the order of states in increasing entropy?

Answer 2

solid
liquid
gas

Question 3

what happens to the entropy when:
solid —> liquid

Answer 3

increases

as the randomness of the particles has increased

Question 4

what happens to the entropy when:
liquid —> gas

Answer 4

increases

as the randomness of the particles has increased

Question 5

what happens to the entropy when:
liquid —> solid

Answer 5

decreases

as the randomness of the particles has decreased

Question 6

why does entropy increase going from liquid to gas?

Answer 6

because the particles are more spread out and random meaning the energy is more spread out

Question 7

what happens to the entropy when the moles of gas increase in a reaction?

i.e more moles of gas in products than reactants

Answer 7

it increases

because more gas means more randomness and disorder so greater entropy

Question 8

what is the standard entropy?

Answer 8

entropy of one mole of a substance under standard conditions

Question 9

how do you calculate entropy change?

Answer 9

products - reactants