Particle Model of Matter Flashcards
what are the 3 main assumptions of the kinetic model?
particles are small, inelastic and spheres
Use kinetic theory to describe a solid melting.
as the substance is heated, the particles gain energy and vibrate faster on spot. Eventually they have so much energy that they can overcome their forces of attraction and the substance melts into a liquid
What happens if u heat a gas in a not expandable container?
pressure increases
What is the formula for density?
density = mass/volume
What are the units of density?
kg/m^3
What is specific latent heat?
the energy required to change 1kg of a substance from one state to another without changing its temperature
What does latent heat depend on?
type of substance
What are the 2 type of specific latent heat?
specific latent heat of vaporisation (liquid-gas)
specific latent heat of fusion (liquid-solid)
What is the equation for specific latent heat?
energy (required or released = mass (Kg) * specific latent heat (J/Kg)
What happens to the temperature of a substance whilst it changes state?
The temperature remains constant
What is the formula for pressure?
pressure = force/area
What is the pressure volume equation?
pressure * volume = constant
When kept at a constant temperature, the pressure and volume of a gas are _____ proportional.
inversely
A gas occupies a volume of 0.5 m3 at a pressure of 150 Pa.
Calculate the pressure exerted by the gas if the volume is compressed to 0.2 m3?
375 Pa
A gas occupies a volume of 0.3 m3 at a pressure of 50 Pa.
The pressure increased to 150 Pa, what is the new volume?
0.1 m^3
