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What’s the MATTER, Properties of Matter
Matter, Properties of Matter
At the conclusion of our time together, you should be able to:
1. Explain the difference between the extensive and intensive properties and other types of properties
2. Distinguish between a physical property and chemical property
Too late to learn this stuff???
The Nature of MatterThe Nature of Matter
Chemists are interested in the nature of matter and how this is related to its
atoms and molecules.
Gold Mercury
Chemistry & Matter
We can explore the MACROSCOPIC world — what we can see —
to understand the PARTICULATE worlds we cannot see.
We write SYMBOLS to describe these worlds.
A Chemist’s View
2 H2(g) + O2 (g) --> 2 H2O(g)
MacroscopicMacroscopic
SymbolicSymbolic
ParticulateParticulate
Septic Tank Humor
Properties of Matter
2 Types:
Extensive – depend on the amount of the sample
Always involves a number with unit Examples = volume
masslength
Properties of Matter (cont.)
Intensive – does not depend on the amount of the sample
Usually does not involve a number Examples = density
melting, boiling point
malleabilityductilitycolorodor
Properties
Every substance has a unique set of properties (characteristics that identify that substance)
Physical Properties- Properties that can be measured
without changing the identity and composition of the substance
Physical Property Examples-
Color Odor Density Melting Point Boiling Point Hardness Solubility
A Stick
What Do You Call a Boomerang That Doesn't Work?
Graphite — this layer structure of carbon atoms reflects its physical properties.
List Some Physical Properties of:
Chemical Properties
Properties that describe the way a substance may change to form other substances
Only observed when a chemical reaction takes place
Chemical Property Examples
Combustible Reactive with water or acid Flammable Corrosive Decomposes in air
Do I Have to Learn this Stuff???
Physical vs. Chemical Properties
Physical Properties- Properties that can be measured
without changing the identity and composition of the substance
Chemical Properties- Properties that can be measured by
changing the identity and composition of the substance
Matter, Properties of Matter
Let’s see if you can:
1. Explain the difference between the extensive and intensive properties and other types of properties
2. Distinguish between a physical property and chemical property
Design a Hypothesis
Properties of Matter
2 Types:
Extensive – depends on the amount of the sample Intensive – does not depend on the amount of the
sample
Physical vs. Chemical Properties
Physical Properties- Properties that can be measured
without changing the identity and composition of the substance
Chemical Properties- Properties that can be measured by
changing the identity and composition of the substance
Physical vs. Chemical Property
Examples:
melts at 55oF
flammable
will tear easily
will dissolve in
water
will tarnish
physical
chemical
physical
physical
chemical
Examples:
will rust
mixture can be
separated by boiling
burns
freezes at -20oC
can be crushed
Physical vs. Chemical Properties
chemical
physical
chemical
physical
physical
Familiar Saying
A rotating lithoidal fragment never accrues lichen.
A rolling stone gathers no moss!!