6.2 Understanding Physical Change Flashcards
What is the particle model?
A model that shows solid, liquids and gasses
All matter is made up of invisible ball like particles, what are the balls like?
Hard, incompressible and invisible
Attracted to each other
Constantly moving
The bond between solid particles are…
Tight and rigid
Can solids be compressed and so they hold their own shapes?
No they can’t be compressed and they hold their own shape
Do particles in a solid vibrate even though they are in a solid?
Yes they do and vibrations increase with the temperature.
Is a liquid compressible?
No but the particles aren’t stuck as tightly together as a solid so they take the shape of the container.
Do the particles move faster or slower when the temperature is increased?
They move faster
Do the liquid particles vibrate or move freely through a container?
The do both
Is there a large space between the particles in a gas or solid?
In gas, there are large spaces between the particles
Are gasses compressible?
Yes they are highly compressible
How do particles move in gas?
They move in a straight line until colliding with other particles, this is why a gas always fills a container
How do we understand expansion, contraction and pressure?
By looking at how change in motion of particles change with the temperature
What do liquid particles do when they are heated?
The move faster
What do solid particles vibrate in?
The vibrate in a fixed position, as the temperature increases, so does the vibrations. They push the particles further apart, causing the solid to expand
What happens when a solid is cooled?
As the temperature decreases, the particles vibrate less and less, allowing them to be packed more tightly and the solid contracts