Law of Thermodynamics
Law of Thermodynamics
Label the following as isothermal (T), Adiabatic (A) or isovolumetric
generally happens very quickly
___no Q in or out of gas
___Q = W
___No work is done on or by the gas
___W = 0
V = 0
U = Q
___Any change in temperature is due to
work being done on or by the gas.
How does a heat engine work?
Heat added to the engine causes the engine to do work as it transfers to a cooler reservoir.
What happens to
the Pressure, Work done, Temperature, Volume of a gas when it is compressed
AND when it expands.
Compression: (increase P, T,
U) decrease in V
Work done on the gas
Expansion: (decrease P, T, ΔU) increase in V + Work done by the gas
dy all information in the thermodynamics note packet; Review your thermodynamics quiz
Study all information taken in your nuclear notes; Decay worksheet
A Relates to internal energy of an object.
B Internal kinetic energy of atoms in a material.
C No heat is transferred because the gas
expand or compresses quickly.
D A measure of disorder of something.
E No change in temperature because any change in
heat is accompanied by an equal amount of work.
F Internal energy t
ransferred between objects
G No change in volume, so no work is done. Therefore
any change in internal energy is due to
I Energy tends towards disorder
H Conservation of Energy
W = P•ΔV
V = A
ΔU = Q
W = Q
Gas in a container is at a pressure of 1.6 x 10
Pa and a volume of 4 m
. What is the work
done by the gas if it expands at constant pressure to twice its initial volume?
6.4 x 10
. Heat is added to a system, and the system does 26 J of work. If the internal energy
increases by 7J, how much heat was added to the system?
. The internal energy of the gas in a gasoline engine’s cylinder d
ecreases by 195 J. If 52 J
of work is done by the gas, how much energy is transferred as heat? Is this energy added
to or removed from the gas?
. If a steam engine takes in 22540 kJ from the boiler and gives up 19150 kJ
during one cycle, what is the engine’s efficiency?
. If the energy removed from an engine as heat during one cycle is 600 J, how much energy
be added to the engine during one cycle in order for it to operate at 31 percent
A 208 g sample of sodium
24 decays to 13.0 g of sodium
24 within 60.0 hours.
What is the half
life of this radioactive isotope?