Chapter 1 NotesSection 2+3

Physical Properties(characteristics)

can be observed or measured without

changing the object

Examples:

1. Color

2. Odor

3.Thermal conductivity – ability to transfer heat

4. Solubility ability to dissolve

5. Malleability – ability to be pounded into thin sheets

6. Ductility – ability to be pulled into thin wires

7.Density mass per unit volume Density is the same for the same

substance

Density of one substance is usually different than the density of other substances

Formula to calculate density: D = M Density = Mass (g) V Volume (mL)

The density of pure water is 1 g/mL

A substance with a density greater than water sinks in water

A substance with a density less than water floats in water

Chemical Properties arebased on the ability of a substance to change into another substance with new and different properties

Examples:Flammability – ability to burn

Nonflammable – will not burn

Reactivity with oxygen

Reactivity with water

Reactivity with acid

Physical changesaffect only the appearance

of a substance

Examples

Melting

Dissolving

Sanding

Cutting

Bending

Mixing

Chemical changeis a process where a

substance changes intoanother substance

Examples

Color change

Fizzing

Sound or Light

Odor

Temperature