Particle Model Of Matter Flashcards
Describe the particles of a liquid in terms of their energy and movement
Particles are held to close together but can move past each other they form irregular arrangements the particles move randomly at low speeds
What is density a measure of
Density is a measure of the amount of mass
How does a cooling system affect its internal energy
A cooling system decreases its internal energy
What is specific latent heat of vaporisation
The specific latent heat of vaporisation of a substance is the amount of energy needed to change 1Kg of that substance from a liquid to gas
What are the units of specific latent heat
J/Kg
What are three states of matter
Solid liquid gas
For each state of matter describe the arrangement and movement of the particles
Solid- regular arrangement very low energy particles vibrate on the spot
Liquid- irregular arrangement particles move past each other at low speeds
Gas- random arrangement high energy particles move randomly
What is formula for density
Mass➗volume
Give an example of the possible units for density
Kg/m3
What happens to the particles of a substance when that substance is heated
They gain kinetic energy and the particles move faster and they change state
Name the 6 changes of state
- freezing
- boiling
- evaporating
- condensing
- melting
- sublimating
Is the change of state a physical or chemical change
Physical
True or false mass stays the same when a substance changes state and why
True because mass is conserved
Explain the cause of the flat sections on a graph of temperature against time for a substance being heated
It’s when energy is being transferred for a substance to change state
Define specific latent heat
The amount of energy needed to change 1 kg of a substance from one state of matter to another without changing its temperature
What is meant by the term specific heat of fusion
Changing from a solid to liquid or melting or freezing
Explain how a gas in a sealed container exerts pressure on the walls of the container
Gas particles move at high speeds and bang into the walls of the container so when they bang into it they exert a force on it.
In a sealed container the outward gas pressure is the total force exerted by all the particles in the gas on a unit area of the container walls
A sample of gas is heated in a container with a fixed volume what happens to the pressure of the gas as it’s heated
- as the particles are travelling quicker it means they hit the sides of the container more often in a given amount of time
- each particle has a larger momentum which means they exert a larger force when they collide with the container
