Particle model Of Matter Flashcards
(10 cards)
What is temperature a measure of?
The average internal energy of a substance.
What is internal energy?
The sum of the kinetic and potential energy stores of all the particles that make up a system
Why does temperature not increase or decrease when changing state? For going “up” and “down” a state
When going “up” a state, the energy supplied is being used to break the bonds.
When going “down” a state, the internal energy decreases but energy is released when forming bonds, so they cancel out.
What is specific latent heat? Down and up
The amount of energy required for 1kg of a substance to change state, or the energy released when 1kg of a substance changes state
Specific latent heat =
Energy / mass
What causes pressure and what direction is the force in?
Particles colliding with the walls of their container or with a surface exerts a net force.
This force is exerted at right angles to the surface.
How is pressure measured?
The force exerted on a container per unit area
How does increasing temperature affect pressure? Explain
Particles have more internal energy so more kinetic energy
They collide more often and with more force (more energy and moving faster)
Smaller volume effect on pressure?
Particles will collide more frequently because less distance to travel so pressure increases.
pV = constant
explain what this means
When pressure increases volume decreases (+ converse)
(Inversely proportional)
