particle model and pressure Flashcards
describe the motion of molecules in a gas
they are in constant random motion
what factors affect the average kinetic energy of gas molecules
. the temperature of the substance
.the higher the temperature, the higher the kinetic energy of the molecules
what effect does increasing temperature have on the pressure of gas , when held in a constant volume
pressure of the gas will increase as the temperature increases
why does pressure increase as temperature increase, at a constant volume
. kinetic energy of molecules increases
. collisions between molecules becomes more frequent
.greater rate of change of momentum
.greater force and therfore pressure
if gas A , is at a lower pressure and gas B is at a high pressure, what can be said about the rate of collisions in each gas
. there are more collisions per second in gas B , than in gas A
. the rate of collisions is higher in B
describe the force that the pressure of a gas exerts on the walls of its container
. the net force acts at right-angles to the containers surface
. the force increases as pressure increases
explain how increasing the volume of a gas results in a decrease in pressure
. molecules become more spread out so time between collisions increases
.this reduces the rate of collisions
.rate of change of momentum, decreases so force is exerted on container decreases. resuting in lower pressure
what can be said about the product of pressure and volume for a fixed mass of gas at a constant temperature
it is constant
.p V= constant
what is the unit used for pressure
pascal - Pa
what increases when you do work on a gas
. the internal energy of the gas
.this can also lead to an increase in temperature
why does the temperature of air inside a bike pump increase when it is pumped
. work is done on a gas when it is compressed
.doing work on a gas increases its internal energy , so also increases the average kinetic energy of the molecules
.temperature increases with an increase of average kinetic energy
