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!!

Oobleck Time!!