The symbols above can be found within the symbols below to indicate
What are two statements you could say about chemical
changes as opposed to physical changes?
a new substance
Chemical changes always result in ___________________,
whereas a physical change doesn’t.
reversed
A chemical change cannot be ________________
whereas a
physical change can.
 Change
in colour
 Release
of heat
 Formation
or a gas
of a solid
 Change
in
odour
 Absorption
of
heat
 Production
light
of
-EACH OF THE ABOVE IS A HINT THAT A CHEMICAL REACTION HAS OCCURRED.
THE OCCURRENCE OF ONE DOESN’T NECESSARY MEAN A CHEMICAL REACTON
TOOK PLACE.
-TO DETERMINE IF A CHEMICAL REACTON TOOK PLACE, YOU HAVE TO THINK
ABOUTWHETHER A NEW SUBSTANCE WAS FORMED OR NOT
ammonium thiocyanate + barium hydroxide + heat 
barium thiocyanate + water + ammonia gas
What are the reactants and products of paper burning?
paper + oxygen  carbon dioxide + ash + light + heat
What are the reactants and products of water formation?
Oxygen gas + hydrogen gas  water
The model has 3 main
particles that are being
shown in yellow, blue,
and red.
What are these particles
called?
atom
Rusts
Can be poisonous if enough is ingested
(used to be used in paint
Makes balloons float
Precious metal
Hydrogen
Oxygen
carbon
iron
lead
helium
gold
titanium
Aluminum
Metal that is liquid at room temperature mercury
Found in large amount in bananas potassium
When split releases huge amounts of energy
uranium
Metal used as pins or plates to hold broken
bones together
sodium
chlorine
sulfur
copper
silicon
magnesium
iodine
nitrogen
calcium
tin
neon
After looking at the periodic table in
your class, what will all of the above
elements have in common?
They are all in the same group and will have
similar chemical properties
-The number under the atomic
mass indicates the overall
charge of the atom when it
either gains or loses an electron.
When an atom gains or loses an
electron, it is no longer
electrically neutral and is no
longer called an atom. It is
considered an ion.
-How many electrons will a
simpsonium ion have?
4
Combustion is the exothermic combination of a substance and
oxygen.
Corrosion is a slow chemical change that occurs when
oxygen and moisture decompose a substance.
Cellular respiration takes place in cells to produce energy.
Two types of compounds: Ionic and molecular
Need a periodic table for this
presentation
Need a periodic table for this
presentation
 Match
each compound with its molecular model by
placing the number next to the chemical formula
underneath the appropriate model.
 Sometimes
different colors are used to represent
different elements instead of different sizes
 Using
the information above, which of the
following chemical formulas represents the model
without a name?
d
 Some
models use the same colors and sizes
no matter what the atoms are
B
Need periodic table
Hydrogen + disulfur monohydride  dihydrogen disulfide
Gasoline: C8H18
Natural Gas
(methane): CH4
Your stomach
Strong cleaners
(like oven cleaner
or drain
cleaner).
fertilizers
Cow burps
Dihydrogen monoxide
(common name water)
-Difficult to count how many water molecules there are
-By looking at just the model, it would be hard to tell if
it there are actually six H2O molecules or if there are
other compounds such as H2O, HO3 and OH compounds
joined together (seen below)