Review and Describing Matter
First Things First
1. Behaviour
Bob
 Be seated on your spot while class is going, unless
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it is a break
Keep objects to yourself
Talk only during a group activity or answering
Silent work time is silent
No music during lecture time
2.YOU are responsible for your learning.
Why the weird questions?
 Science is not about being given the answers.
 Science is about coming up with the answers by
yourself.
 If green peas are solid, and solid molecules
behave like x y z, and a mug is a solid, YOU
should be able to conclude what the molecules in
the mug will behave like.
Pocket activity time.
Decide – Chemical or Physical change?
You have five minutes.
Chemical and Physical Change
 Chewing Food -
C and P
 Cutting Apple -
P
 Digesting food -
C
 Melting -
P
 Fireworks -
C
 Tearing Paper -
P
 Frying eggs -
C
 Popping popcorn - P
 Popsicle melting - P
 Boiling water-
P
C
Roasting Marshmallows - C
P
Bending Wire C
Food decaying C
Baking a cake C
Rotting banana P
Melting candle C
Nail rusting C
Burning match P
Shattered glass A reaction gets hotter or cooler Bubbles / fizzing Leaves changing color in the fall Dissolving sugar in water-
 Making toast 
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C
C
C
P
Vanishing Water
 When the water boils, the molecules on the liquid gain
kinetic energy and become more and more active, until they
start escaping the liquid state.
 When the water vapour touches the plastic, it gives some of
its kinetic energy away; the heat will pass to the plastic,
causing the molecules to group closer together, finally
forming minute droplets of water on the plastic, like a thin
layer of fog. This is called condensation.
 If the droplets are left alone for a while, the air pressure and
movement will start agitating the outer molecules on the
droplets; they will gain kinetic energy, and start breaking free
from the liquid form. This is called evaporation.
Weird question:
 Why does hot coffee cool
when left out?
Poetry assignment
 Try to use correctly as many of the following words as you can,
while keeping the poetry interesting:
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Melting
Melting point
Boiling
Boiling point
Condensation
Solidification
Freezing
Sublimation
deposition
Due Today
 Pea Lab Sheets
 Poetry -Temperature and Changes of State
Due Friday
 Worksheet with fill-in-blanks
 Cue cards
Quiz Monday
Pages 16 - 23
Paper Bag Lab
 On your binder, describe what is happening to the molecules
inside the bag. Why does the bag rise?
 Pair up with a fellow scientist and discuss.
 You have five minutes.
Describing Matter
 Physical Properties: characteristics of matter than can be
observed or measured.
QUALITATIVE
State
Colour
Malleability
Ductility
Crystallinity
Magnetism
QUANTITATIVE
Measurable
Solubility
Conductivity
Viscosity
Density
Melting/Freezing point
Boiling/Condensing point
Glass
Qualitative:
Brittle
Not crystalline
Transparent
Quantitative:
NOT Conductive
Copper
Qualitative:
Ductile
Malleable
Reddish-brown
Luster
Quantitative:
Conductive
Pure Substances
 Pure substances are made up of only one kind of matter.
ELEMENTS
•Pure substance that can’t be
broken down and separated into
other substances.
Magnesium
Copper
COMPOUNDS
•Pure substance formed by at
least two elements combined in a
specific way.
Salt -- NaCl
Water – H2O
Density Problems Worksheet
Mass = Grams
Volume = cm3 or Milliliter
WATER DENSITY = 1 g/cm3
 What is the density of a piece of wood with a mass of 25
grams and a volume of 29.4 cm3?
M = 25
V = 29.4
D = 25
29.4
D = 0.85 g/cm3