entropy

Question 1

what is entropy a measure of

Answer 1

the number of ways that a particle can be arranged and the number of ways the energy can be shared out between particles

Question 2

how do you get a higher entropy

Answer 2

the more disordered the particles are higher the entropy

Question 3

what value shows a high entropy

Answer 3

a large positive entropy shows high level of disorder

Question 4

why does more particles mean more entropy

Answer 4

because the more particles you have, the more ways they and their energy can be arranged

Question 5

why does more arrangements mean more stability

Answer 5

because theyre more energetically stable when theres more disorder, so particles move to increase their entropy

Question 6

what does a ‘feasible’ reaction mean

Answer 6

the reaction happens itself, without the addition of any energy, even when the enthalpy change is endothermic

Question 7

what is the formula for calculating enthalpy change

Answer 7

ΔS° = ΣS°(products) - ΣS°(reactants)

Question 8

what is the defintion of standard entropy of a substance

Answer 8

is the entropy of 1 mole of that substance under standard conditions in standard conditions

Question 9

how does the value for entropy of a product or reactant change if you have more than 1 mole of it in a balanced equation

Answer 9

you multiply the entropy for the reactant or product by the number of moles in the balanced equation

Question 10

an increase in total entropy means that it is feasible for a reaction to occur, but why is it not a guarantee

Answer 10

because enthalpy, temperature and kinetics play a part in whether a reaction occurs or not