Enthalpy And Entropy

Question 0

What is the definition of the enthalpy of formation?

Answer 0

The energy change when one mole of products is made from its constituent elements in their standard state in STP

Question 1

What is Hess’ law?

Answer 1

The enthalpy change is the same, irrespective of route taken

Question 2

What is STP?

Answer 2

298 K (25°C)
100KPa (1atm)

Question 3

How stable is a compound with a negative -ΔH?

Answer 3

The more negative, the more stable the compound is as it at a lower energy level (therefore has less internal energy)

Question 4

What is entropy?

Answer 4

The freedom possessed by the molecules or atoms within the system

Question 5

What is the symbol and units of entropy?

Answer 5

S

JK^-1mol^-1

Question 6

What is the equation to find how spontaneous a reaction is?

Answer 6

ΔG= ΔH- TΔS

Question 7

What is 0° in Kelivin?

Answer 7

273K

Question 8

If a reaction is spontaneous ΔG must be-

Answer 8

Negative

Question 9

If a reaction is spontaneous, what will ΔG and Kp/Kc be?

Answer 9

ΔG will be negative, Kp and Kc will have large values because the products will predominate