#2 Entry- Introduction to Elements

Elements, Compounds and Mixtures

Today, we started on Elements. Mr Foo gave each group a sheet of paper which has several boxes of atoms and particles in them. He had us classify them according to our own criteria, before he told us what was what.

My group's criteria was: Shape and Color

We later had to guess the different criteria that other groups used to classify.

Several Questions:

1. Which one do you think comes from same type of substance? Why?

Criteria: Same size of particles, same shape, same color

2. What do you think each particles represents

They represent different elements, compounds and mixtures.

Some pointers to note: 

- Mickey mouse shape molecules are water molecules

- As long as they do not form bonds, they are different

- Particles in orderly position VS particle in random position

(Reason: Particles that are in random position are heated)

- The more particles that occupy the same space per unit, the higher the density

- Particles is a general term that represents anything inside a substance. Atoms and molecules are sub groups of particles

Particles-Atoms-Molecules

(Source: http://faculty.colostate-pueblo.edu/linda.wilkes/111/2a.html )

Questions:

1. How do these particles bond?

2. Why do they bond?

Next lesson: Periodic Table, Elements, Compounds and Mixtures