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

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

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

Properties of One Penny Metal Composed of 2.5% copper and 97.5% zinc Mass – 2.50 grams Volume – 0.442 mL Density – 5.66 g/mL

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

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.

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