THERMAL Flashcards
Latent heat
The amount of energy required to change the state of a substance
Specific heat capacity (c)
The amount of energy that a given mass of substance (either 1 g or 1 kg) can absorb that produce a 1*c increase in temperature
A sealed container contains a mixture of 2 substances, what is the ratio of average kinetic energy
1
Should ml ever have a number in front
No
What is power lost
Power lost = power given - power absorbed
What condition are needed for a real gas to behave as an ideal gas
A real gas approximates to an ideal gas at conditions of low pressure, moderate temperature and low density. Under these conditions the intermolecular forces in the gas are small enough to be ignored.
Avogadro constant (NA)
the number of atoms in 12g of 12C
boiling
takes place throughout a liquid and always occurs at the same temperature
Boyle’s law
at a constant temperature, the pressure of a gas is inversely proportional to its volume
Charles’ law
at a constant pressure, the volume of a gas is proportional to its temperature (in K)
evaporation
takes place at the surface of a liquid and can happen at all temperatures
internal energy
the sum of the total intermolecular potential energy and the total random kinetic energy of the molecules in a substance
isothermal
constant temperature
molar mass
the mass of one mole of a substance
mole (m)
the amount of a substance that contains the same number of atoms or molecules as the number of atoms in 12g of 12C
pressure law
at a constant volume, the pressure of a gas is proportional to its temperature (in K)
specific latent heat (L)
the amount of energy per unit mass of a substance absorbed or released during a change of phase (with no temperature change)
temperature
a measure of the average random kinetic energy of the molecules in a substance
thermal capacity (C)
the amount of energy required to raise the temperature of an object by 1K
thermal equilibrium
a situation where objects are at the same temperature
ideal gas, list 3 ideals and what conditions is a real gas an ideal gas?
- they undergo perfect elastic collisions between themselves and the walls of their container (no ek lost)
- have no intermolecular forces between them (the internal energy of an ideal gas is therefore the sum of the kinetic energy of the molecules as ep=0)
- are random in motion.
- are spheres
A real gas is an ideal gas at, low pressure, low density and moderate temp (but go with high temp on multi-choice)
Pressure law
pressure is proportional to temperature, for a fixed amount of gas at constant volume
