Entropy

Question 1

What is the letter symbol for entropy?

Answer 1

S

Question 2

What is the main concept of entropy?

Answer 2

Total energy of a system and surroundings remains constant.

This is bc energy is neither created or destroyed.

Question 3

What does entropy tell us?

Answer 3

It tells us how spread the energy is in a system, the degree of disorder.
The disorder WILL increase, unless work is done to counter it.

Question 4

How to counter the increase in disorder (entropy)?

Answer 4

Have work done on the system.

Question 5

What is the equation for change in entropy with q?

Answer 5

delta S = delta q / T

Question 6

What is the equation for change in entropy with H?

Answer 6

delta S = delta H / T (Jmol-1 K-1)

ONLY at constant P, q = H

Question 7

What is the unit for change in entropy with H?

Answer 7

Jmol-1 K-1

Question 8

At constant P, how does the equation for change in entropy change?

Answer 8

At constant P, q = H

So : instead of delta S = delta q / T
You get : delta S = delta H / T (Jmol-1 K-1)

Question 9

What does q stand for in the equation for change in entropy?

Answer 9

Heat energy.

Question 10

Why is entropy considered SASSY?

Answer 10

Units of measurement = Jmol-1 K-1

Only one to include K-1