CHAPTER 3
MATERIALS
What is a material?
Components of object
Example :
Substance
A substance is a pure type of
solid,liquid or gas
Example : Pencil > Solid
Milo > Liquid
Oxygen > Gas
What is a particles
Small bit of something
Big particles > dust
Particle model of matter
Difference in properties between
substance that are solids, liquids,
and gas
Particles have space
Particles move - solid, liquid, or
gas
Solid
Liquid
Definite shape uncless force is exerted
Takes the shape of material
Packed closely
Patricles are further apart
Melting and Solidifying
Melting
Solidifying
Melting
Solidifying
Change of state
State : solid, liquid or gas
Is a process when a substance melt or
solidifies
Know as a physical process
Change of state
Particles get energy when heated
Heat energy is change to movement energy
Particles move faster and move away from
each other
Next class : Chemical reactions
1.What happens when you heat an
ice cube?
2.Can you reverse this process?
1.What happens when change the state of
ice cube ?
2.When substances such as solids, liquids
or gas are mixed, they form a new
substance or material
Material A + Material B = Material C
Material A + Material B = Material C
Chemical Reaction
Cement powder + Sand +Water +Limestone = Concrete
Chemical Reaction
Metal + Water +Air =Rust
Chemical Reaction