Topic: Matter
Aim: Describe the different properties and
changes of matter.
Do Now:
1. Take out the mass and Volume HW
2. Take out your Properties Reading notes
3. Work on the Density ISA
HW: Finish Density ISA
165.9g
511.0g
1. Identify structures X, Y and Z. Support your
answer.
2. Identify the atomic number of this element.
Support your answer.
X Proton
Y Neutron
Z Electron
Atomic # = 2
There are 2 protons.
1. Identify an example of a physical
property.
•
•
•
•
•
•
Size
Color
Shape
Odor
Texture
States of
matter
• Density
• Melting point
• Heat conductivity
• Electrical conductivity
• Hardness
•Sulfur
•Yellow solid
•Mercury
•Silver, heavy,
moveable liquid
•Melting point:
112.8 C
•Melting point :38 C
•Boiling point:
444.6 C.
•Very high density at
13.5 g/cm3
•Boiling point: 356 C
•Nitrogen dioxide
•Brownish-red gas at
room temperature
•Poisonous gas.
•Melting point: -9.3 C
•Boiling point: 21 C.
•Density: 3.3 g/l.
2. Identify an example of a chemical
property.
•
•
•
•
Flammability
Heat of combustion
Reactivity with other chemicals
Chemical stability
http://www.youtube.com/watch?v=afxwDTz_JTk&feature=related
A glowing
wooden splint
placed in a test
tube will
continue to burn
until the O2 is
used up.
3. Identify the type of change
(physical or chemical) in which a
new substance is produced.
• Chemical change
When the Statue of Liberty
was built in 1886, the copper
metal was copper in
color. By 1900, it had turned
a turquoise color because
the copper underwent a
chemical change. The
metallic copper changed to a
mixture of copper oxides,
copper carbonates, copper
sulfates, and copper
chlorides due to exposure
to various chemicals in the
air and rain.
Boiling an egg causes
a chemical change
because the heating
of the egg causes the
protein in the egg to
change shape which
creates new
proteins. When the
egg cools down it
doesn't look the same
as it did before you
heated it up..
Mixing vinegar and
baking soda results in
the mixture bubbles
and fizzes. Water,
carbon dioxide, and
sodium acetate are
produced.
The chemical changes
occurring when baking a
bake results in sodium
bicarbonate and tartaric acid
in the baking powder
reacting chemically to
produce carbon dioxide
gas so your cake will rise.
4. Identify an example of a physical change.
Support your answer.
• Melting an ice cube
• Water molecules are still water molecules (There
was nothing new produced.)
An example of a physical
change occurs when
making a baseball bat.
Even though the wood
has changed shape
and therefore physical
properties, the
chemical nature of the
wood has not been
altered. The bat and
the original piece of
wood are still the
same chemical
substance.
Making a baseball bat
5. Identify an example of a chemical change.
Support your answer.
• When hydrogen peroxide (H2O2) become water
– Oxygen bubbles
• Iron rusting produced iron oxide (Fe2O3)
NEW SUBSTANCES ARE PRODUCED
Ex:
• burning of wood
• Ash and CO2
are produced
The fireworks we see
on the 4th of July
are examples of
chemical changes.
They are actually
metals such as
magnesium and
copper that change
chemically as they
light up the night
skies with their
fantastic colors.
Let’s summarize…
1. Explain what occurs during a chemical
change.
2. Explain what happens to a substances
when a physical change occurs.
3. What are some of the chemical changes
of matter?
Physical or Chemical Property?
Combustibility CP
Density
PP
Malleability
PP
Tendency to
corrode
CP
Weight
PP
Volume
PP
Failure to
react
Ductility
CP
Melting point
PP
PP
Odor
PP
Texture
PP
Flammability
CP
Physical or Chemical Change?
Digestion of
food
Getting a
haircut
CC
Explosions
CC
PP
Lighting a candle
CC
Evaporation
PC
Tarnishing silver
CP
Ice cube
melting
PP
Formation of acid CP
rain
Crushing rocks
PP
Dissolving salt in
water
PP
Review
http://www.teacherbridge.org/public/bhs/teac
hers/Dana/chemphys.html
An example of a chemical change is
1) evaporation
2) condensation
3) burning
4) freezing