Thermal Physics Flashcards
what is the internal energy of a gas and an ideal gas
normal gas : sum of kinetic and potential energy’s
ideal gas : sum of kinetic energys
why is internal energy of an ideal gas only kinetic energy
particles assumed to have no interactions therefore the energy is only due to there movement
how can you increase internal energy of a gas
- do work on the system
- increase the temperture
when a change of state is observed happens to its internal energy
ONLY potential energy of particles change when changing state therefore there is no change in temperature however internal energy rises due to the change in potential energy
describe transfers of energy when a substance is heated
when temperature is increases kinetic energy of particles is increasing, when a substance changes state no change of temperature is observed therefore energy is only transferred to potential energy store
what is the definition of specific heat capacity
energy required to raise the temperature of 1 kg of a material by 1 degrees without changing its state
what is the definition of specific latent heat
energy required to change the state of 1 kg of material without changing its temperature
what is Boyles law
at constant temperature p ∝ 1/v
what is Charles law
at constant pressure V ∝ T
what is gay Loussac law or the pressure law
at constant volume P ∝ T
4 assumptions of an ideal gas + kinetic theory
R - random motion
A - attraction ( no intermolecular forces)
V - volume of particles are negligible
E - elastic collisions between particles
D - duration of collisions is negligible
what is Avogadro’s number
number of atoms in 1 moles of a substance (12g of carbon12)
equation for number of particles using Avogadro’s number
number of particles = Number of moles x Av
how does atomic mass of a particle relate to moles
The atomic mass is the mass 1 moles of the substance in grams
what is the equation for the number of moles involving mass and molar mass
Num. of moles = Gram/RAM
