State of matter

• Science
• Secondary Education

What is matter?

Everything is made of matter

• Has mass
  
• Takes up space
  

There are three state of matter

What is the three state of matter?

Comparing the states

Properties of solid, liquid and gases

Make a table of the properties of the three states of matter

Hint: Shape, volume, density and more

	Solid	Liquid	Gas
Mass	definite	definite	definite
Shape	definite	Varies, depends on caintainer	Takes the shape of the container
Volume	unchange	unchange	varies

Compressibility

hard

hard but flows easily

easy and flows easily

How are all three states of matter different and similar?

Identify a substance that can exist in three states of matter at a same time

First idea of matter

1. Discovery of fire --->  Cook food, bake clay and make bricks
2. Around 600BCE, the Greeks were fascinated by the way substance can change from one form to another
3. Thales----> all substance are made from single element
   
4. First 4 elements- air, water, fire and earth. This theory was used for 2000 years
5. Democritus: Substance can be divided into tiny piece until it cannot be divided anymore, atom
6. Investigation leads to particle theory
   
7. Modern days: electron microscope can see the arrangement of atoms
   

The particle theory of matter

Matter is made of particle so tiny, it cannot be seen with naked eye.

Different substance are made of different particle or different size.

They are called atom or molecules

Predict the particles is solid, liquid and gas

Solid

Strong forces holding particles together

Form orderly arrangement called lattice

Particles move a little

Liquid

Forces holding particles together are strong but weaker than solid

Particles can change position by sliding over each other

Gas

Forces of attraction between particles are very small

Particles can move away from each other and travel in all direction

They hit each other, bounce and change directions

According to the particle theory, why do liquid flows but solid do not?

Tiny particles that cannot be seen by naked eye are called...

1. Atom
2. Molecule
3. Minute
4. All of above

Particles in solid can move freely

1. True
2. False

Gas has definite

1. volume
2. weight
3. mass
4. height

Make a summary of today's lesson. 

Think about how state of matter of a substance can be changed?