week 1 thermo

Question 1

what does isochoric imply?

Answer 1

constant volume

Question 2

what does isobaric imply?

Answer 2

constant pressure

Question 3

what does isothermal imply?

Answer 3

constant temperature

Question 4

what is a system that permits transmission of energy and matter termed?

Answer 4

open system

Question 5

what is a system that permits the transmission of energy but not matter termed ?

Answer 5

closed system

Question 6

a system that permits neither the transmission of energy and matter is termed ?

Answer 6

isolated system

Question 7

what is a wall that permits the transmission of heat called ?

Answer 7

diathermic

Question 8

what is a wall that prevents the transmission of heat called ?

Answer 8

adiabatic

Question 9

what is a state function and give nine examples of them ?

Answer 9

a state function describes the state of a thermodynamic system, there is
pressure
volume
temperature
enthalpy
entropy
Gibbs energy
mass
quantity
internal energy

Question 10

what one property do all state functions have In common ?

Answer 10

the value does not depend on the path taken to reach the specific value

Question 11

what are the two path functions and describe the difference between them in terms of molecular motion ?

Answer 11

the two path functions are heat and work
heat energy transfer is random molecular motion
work energy transfer is uniform molecular motion

Question 12

state the zeroth law and its relation to a thermometer ?

Answer 12

if two objects are in separate equilibrium with a third object then they are in equilibrium with each other.
the liquid in a thermometer and the patients mouth both touch the glass so if both of them are at the same temperature as the glass then the liquid and the object are the same temperature as each other.

Question 13

state the law of conservation of energy ?

Answer 13

energy can neither be created nor destroyed however it can be transferred from one form to another

Question 14

state the first law of thermodynamics and the equation?

Answer 14

energy can not be created nor destroyed it can only be dissipated from one form to another.

internal energy = heat energy into the system + work performed on the system

Question 15

explain the importance of a reversible expansion ?

Answer 15

reversible expansion is an important theoretical construct as it determines the maximum amount of work that is performed by an expanding gas

Question 16

what is entropy ?

Answer 16

entropy a state function is a measure of the state of disorder of energy and matter, example solid to liquid more disordered.

the entropy of an isolated system always increases