Friday 23 September 2016

Chem notes

The universe is made of MATTER and ENERGY.  Everything can be classified under matter or energy.

MATTER is a a SUBSTANCE with
MASS (has grams) and VOLUME (volumes take up space)

ENERGY can make matter move.  Forms of energy include
KINETIC ENERGY - MOVEMENT
LIGHT  ENERGY – photons moving
SOUND E…   -  vibrations. Matter moving in a wave.
ELECTRICAL ENERGY – Flow of electrons
MAGNETIC

IN QUANTITATIVE science, we define things that are measurable.  Some things are not measurable

QUALITATIVE science (behavioural science) is difficult to measure but must be described and characterized in non measurable terms.




MATTER
Is made of  subunits called ATOMS.
An atom is the basic unit of all matter in our universe.  Everything is made of ATOMS.  THERE IS NOTHING THAT IS NOT MADE OF ATOMS.

ANALOGY – USING A STORY TO HELP UNDERSTAND A CONCEPT

AN ANALOGY OF ATOMS AND MATTER
ATOMS are like lego
-Lego comes in many different shapes and sizes.  So do atoms.
- you can use lego to build things and break them apart and re-use the lego to build different things. 

If I have three tubs of lego and we have three different types of lego, and each tub has the same type…

ELEMENT – A GROUPING (or a box) of the same type of atom
COMPOUND– when you attach two or more different types of atoms together

MOLECULE – two or more of the same type of atom attached together.

How IONIC COMPOUNDS form

Atoms of an element can have a tendency to form one of two charges. 

Some atoms can form a positive charge   + they are called
CATIONS

Some atoms can form a negative charge  -
ANIONS

Opposite charges always attract thus CATIONS ALWAYS JOIN ANIONS


Use lego pieces and build the following compounds