1. Properties and Changes in Matter
Every substance has characteristic properties.
Chemists use these properties to distinguish between substances and separate them.

2. Vocabulary
1. Combustible – burns when heated in the presence of oxygen 2. Ductile – can be drawn into wires 3. Malleable – can be hammered into sheets

3. Extensive vs. Intensive
Extensive Properties
depend on amount of matter present
volume, mass, and
amount of energy in a substance
Intensive Properties
do not depend on amount of matter present
melting point, density, ability to conduct electricity, percent composition

4. Properties of One Penny
Metal
Composed of 2.5% copper and 97.5% zinc
Mass – 2.50 grams
Volume – mL
Density – 5.66 g/mL

5. Properties of Many Pennies
Metal
Composed of 2.5% copper and 97.5% zinc
Mass – 2500 grams
(1000 pennies x 2.5 g)
Volume – 442 mL
(1000 pennies x.442mL)
Density – 5.66 g/mL
One Thousand Pennies

6. WHICH PROPERTIES REMAINED THE SAME?
Metal
Percent Composition
Density
The intensive properties remained the same because they do not depend on the amount of pennies present.

7. WHICH PROPERTIES CHANGED?
Mass
Volume
The extensive properties changed because they do depend on the amount of pennies present.