Transcript What is DHMO?
The Stuff of Everything… …even water and life
What is matter?
Three
Properties
of
Matter
: 1.
2.
3.
has
mass
takes up
space
shows
inertia
(
force
needed to
change motion
)
What is matter?
Four
states
of matter:
1.
Solid 2.
Liquid 3.
Gas 4.
Plasma
Can matter change?
Matter can
change
in two ways:
1.
2.
Physical
– a change in the
appearance
or
state
of matter
Chemical
– a change in the
chemical make-up
of matter
Can matter change?
P
Melting Ice
P
Water Freezing
C C C
Burning Wood Rusting Iron Animal Decaying
C C C
Rotting Wood Souring Milk Enzymes Digesting Food
P P P P
Water Evaporating Making Glass from Sand Water Boiling Salt Dissolving in Water
What is matter made of?
Composition
of matter:
1.
2.
3.
Elements Compounds Mixtures
What is an element?
An
element
is a
basic substance
of matter and
cannot
be broken down by
chemical
means.
There are about
90 naturally
occurring elements.
discovered
.
117
have been
What is an element?
Elements are represented by chemical
symbols
(
letters
) shown in the
Periodic Table of the Elements
.
Common Elements of Life
Name Symbol Name Symbol
Hydrogen
H
Phosphorus
P
Oxygen Carbon
O C
Potassium Sulfur
K S
Sodium Chlorine Nitrogen
Na Cl N
Calcium Iron Magnesium
Ca Fe Mg
What is an element?
The
smallest unit
an
atom
.
of an element is Atoms are the
building blocks matter
.
of
What is an atom?
Electron Proton Atom Nucleus Neutron
What is an atom?
Atoms have 3 subatomic particles:
Particle Proton Neutron Electron Charge Mass + 1 0 1 0 Function Add mass Add mass Bonding Symbol p+ Location Nucleus N e Nucleus Electron Cloud
What is an atom?
Electrons orbit atoms in
levels
called
shells
.
Atoms like to have their shells
filled
.
What is an atom?
K or 1 st
Shell – closest to the nucleus holding up to
2
electrons
L or 2 nd
Shell – can hold up to a maximum of
8
electrons
M or 3 rd
shell – can hold up to a maximum of
18
electrons
What is an atom?
The number of protons (
atomic number
) in an atom will determine its elemental properties.
The periodic table of the elements shows known elements
by their
atomic number.
What is an atom?
In atoms, the number of
protons
equals the number of
electrons
giving the atom an overall
neutral
charge.
The number of protons plus neutrons in an atom is the
atomic mass number
.
Using The Periodic Table
1
Atomic Number
H
Element Symbol
Hydrogen 1.0079
Element Name Atomic Mass
Using The Periodic Table Atomic Number =
8
Mass Number =
16
Number of protons =
8
Number of electrons =
8
Number of Neutrons =
8 8 8
Using The Periodic Table
Element Atomic Number Mass Number # of protons # of electrons # of neutrons Calcium Silver Gold Uranium 20 47 79 92 40 108 197 238 20 47 79 92 20 47 79 92 20 61 118 146