Module 5 part 1 thermal and ideal gas Flashcards
heat
Heat is the energy that moves between objects due to a temperature difference
thermal equilibirium
a state with no net flow of thermal energy between objects
temperature
a measure of the average kinetic energy of the particles of a substance.
internal energy
sum of kinetic and potential energy of atom or molecule within substance
molecule
a molecule is a stable group of two or more atoms chemically bonded together
intermolecular forces
the force that acts between molecules holding them together
intramolecular forces
the forces that hold atoms together within a molecule
specific heat capacity
the energy required per unit mass to change the temp by 1K
specific latent heat
the energy required to change phase per unit mass while at constant temp
specific latent heat of vaporisation and fusion
the energy required to change phase per unit mass while at constant temp from solid to liquid (fusion), liquid to gas (vaporisation)
mole
the amount of substance containing 6.02 x 10^23 molecules or atoms
officially - the amount of substance containing as many elementary enetities as there are atoms in 0.012kg of carbon - 12
avagadro constant
6.02 x 10^23 number of atoms in 0.012kg of carbon - 12
symbol NA
molar mass
the mass of one mole of a substance
ideal gas
a model of gas including assumptions that simplify behaviour of real gas
gas assumptions (5)
- gas contains large number of atoms or molecules moving in random direction and random speeds
- atoms or molecules occupy negligible volume compared to volume of gas
- collisions of atoms and molecules between eachother and container walls are perfectly elastic
- time of collisions between atom or molecules negligible compared to time between collisions
- electrostatic force between atoms or molecules neglibile except during collision
