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What is Matter???

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by

Adam Leonard

on 21 October 2015

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Transcript of What is Matter???

What is Matter?
Matter is anything that
1. Has Mass
2. Takes up space (volume)
Is air considered matter?
Would these two balloons
have the same mass?
Now that we know what matter is...
name three things that are not considered matter
Light
Sound
Consider this:
What are the building
blocks of matter?

Atoms
Which are very, very tiny!
It is the way in which atoms join together which determine all of the properties of matter that we observe, such as:
Our appearance
Your iPod or cell phone
Or simply, ALL of matter
Heat
It is possible for matter to be made
of only 1 type of atom?
Elements are substances that are made
of only 1 type of atom and cannot be
broken down into simpler substance.
The Periodic Table of elements is an organized way of grouping all of the elements.
Dmitri Mendeleev
Look what I made!
Why are models used in science?
No, not that kind of model!
It's because the things that
we want to look at are either:
a. too small
-or-
b. too big
2 models of the same atom
Ernest Rutherford’s model
What are atoms made of?
1. Protons
2. Electrons
3. Neutrons
Protons:
particles that
have a positive
electric charge
+
Electrons:
particles that have
a negative
electric charge
-
Neutrons:
particles with
no electric charge
How can we find out what makes each atom?
The atomic structure of each type of atom can be determined by looking at the Periodic Table!
All atoms of the same element have the same number of protons.
This means that the atomic number for each element is always the same!
What about electrons?
Finding the number of electrons is easy!

Atoms can gain or lose electrons and will still be the same element but will no longer be neutral.
Atoms with fewer electrons than protons have a positive charge.
When the number of electrons change:
Atoms with more
electrons than protons
have a negative charge.
How do I find the number of neutrons?
o
Luckily, we have another number to look at
on the Periodic Table -- The Atomic Weight
If we take the Atomic Weight - the Atomic Number
We get the number of Neutrons.
Let's do an example
N
i
t
r
o
g
e
n
Atomic number = 7
Atomic weight = 14
Neutrons = Atomic weight - Atomic mass
14 - 7 = 7

Nitrogen has 7 neutrons!
Some atoms of the same element contain a different number of neutrons—these are called Isotopes.
When the number of neutrons change

Some Isotopes are radioactive or unstable & they breakdown into more stable particles.
Ex. Carbon 12 & 13 are stable but Carbon 14 breaks down into Carbon 14. All these variations of Carbon have the same number of protons, but a different amount of neutrons.
Heat, light and sound
are all forms of ENERGY
What's common between these three things?
Let's find out...
Full transcript