Particle Model Of Matter Flashcards
What are the three stages of matter?
Solid liquid and gas
Why are solids and liquids incompressible?
Because there are no gaps between the particles in them.
What are the particles in a solid like?
The particles are in a fixed pattern and fixed sizes and shape.
What are the particles in liquids like?
They are fixed sized particles and are free to move, allowing them to change shape and fit container.
What are the particles in gases like?
Large gaps, making them compressible and enabling them to change size and shape.
What is internal energy?
The total kinetic energy and potential energy of all the particles in a system and is stored by the particles.
What happens as energy is added to a system?
It’s temperature will increase.
What happens as energy is added to a system at the melting/boiling point?
The substance will change shape.
A change of state is…
Reversible
What sort of change is it that alters the internal energy but not the temperature or mass?
A physical change not a chemical change.
What is latent heat of fusion?
The energy needed for substance to change from solid to liquid (melt).
What is latent heat of vaporisation?
Energy needed for a substance to change from a liquid to gas (evaporate)
What do the horizontal heating and cooling graphs indicate?
Where energy is being used to change state.
What are particles of gas in?
Constant random motion and it’s temperature is related to the average kinetic energy of particles.
What happens when the particles of a gas collide with the walls of their container?
They exert a force in the wall which is felt as pressure.
