Physics mod3 kinetic theory & first law of thermodynamics

what is the first law of thermodynamics?

it states that the change in internal energy of a system is equal to the energy supplied to the system plus the work done on the system

what is the equation for thermodynamics?

U=Q+W

what is the equation for work done on a gas? (negative)

W=PV

what is the molar heat capacity of a substance?

the amount of thermal energy required to increase the temperature of one mole of it by one degree

why is the molar heat capacity of a gas at constant volume different from that of a gas at constant pressure?

This difference is due to the fact that at constant pressure, the gas can expand and do work, while at constant volume, the gas cannot do work and all the heat absorbed goes into increasing its internal energy.

what is the equation of state?

pV\=nRT

what is the kinetic theory of gas?

the kinetic theory of gas assumes that a gas is made up of many small particles moving randomly at high speeds.

what are the 4 basic assumptions of the kinetic theory of gasses

all molecules that make up the gas are identical the time of collisions is negligible the molecules are in constant random motion there are no forces of attraction or repulsion between molecules

explain how molecular movement is responsible for the pressure exerted by a gas

the constant random movement of the molecules of gas causes the molecules to collide with each other and the walls of the container and undergoes a change in momentum because of the change in direction

what is the general equation for kinetic theory?

pV\=1/3Nm

what is the equation for the translational kinetic energy of gas?

3/2nRT\=Ek