MOaD 2

Question 1

The Zeroth Law of Thermodynamics

Answer 1

“If system A is in thermal equilibrium with both system B and system C, then B and C must be in equilibrium too.”

Question 2

thermal equilibrium

Answer 2

no change of state occurs when the two are in thermal contact.

Question 3

The 0th Law indicates that….

Answer 3

the existence of a property of a system that is independent of its nature and which defines thermal equilibrium - we call this property the system’s temperature.

Question 4

Internal energy, U

Answer 4

= total of KE + PE

Question 5

KE

Answer 5

Translational energy

Question 6

PE

Answer 6

R,V,E

Question 7

The internal energy at a temperature, T, is given by the internal energy at 0 K, U(0), plus the mean energy at temperature, T:

Answer 7

U(T) = U(0) + <E></E>

Question 8

Example internal energy formula

Answer 8

U(T) = U(0) + NKbT.
WHERE N IS NUMBER OF MOLECULES

Question 9

If N= avocado thus NaKb it equals …

Answer 9

R , 8.1* j mol-1

Question 10

The First Law of Thermodynamics: Conservation of Energy

Answer 10

“The Energy of an isolated system is constant
Energy = heat + work

Question 11

Energy = heat + work

Answer 11

ΔU =q+w

Question 12

. For asmallchange in the internal energydU,

Answer 12

dU=dq+dw

Question 13

Again,dqis

Answer 13

the heat exchanged (+ve if absorbed)

Question 14

anddw is

Answer 14

the work exchanged (-ve if the system does work).