C1- States Of Matter Flashcards
What is the particle model for a gas like
Random, farm apart
Movements are fast in all directions
What’s is the liquid particle model like
Random, close together
The particles move around eachother
Tell me about the particle model for solids
Regular
Close together
They particles vibrate about fixed positions
What are state changed
Physical changes - they can be reversed and the chemical properties of a substance don’t change - particles don’t change only their arrangement, movement and amount of stored energy
What’s deposition
A gas to a liquid state change
What’s sublimation
Solid to gas state change
Why are particles attracted to eachother
By weak forces of attraction - many
Forces in a solid
Some are overcome in melting, the remaining attractive forces between particles in a liquid are overcome during evaporation and boiling
For this to happen - energy must be transferred from its surroundings to the particles
When do attractive forces form
During condensing and freezing- energy must be transferred from particles go surroundings
Why in a heating curve graphs are there straight horizontal lines
The temperature stage Constant eg when a solid is melting jts still being heated but the added energy is making the particles break away from their fixed arrangement
How can you predict the state of a substance
With its melting and boiling point
Below the melting point it’s solid
Between the melting and boiling point it’s liquid
Above the boiling point it’s a gas
