2.2 Physical Properties

1. 2.2 Physical Properties

2. 239---2.3 objectives • 240---2.3 ppt • 241---vocab • 242---P/C Properties wkst

3. 2.2 Objectives…pg 235 • What are some examples of Physical Properties? Before: After: • How can knowing the Physical Properties of matter be useful? Before: After: • What processes are used to separate mixtures? Before: After:

4. Examples of Physical Properties • A physical property is any characteristic of a material that can be observed or measured without changing the composition of the substances in the material. • Examples: Viscosity, Conductivity, Malleability, Ductile, Brittleness, Hardness, Melting Point, Boiling Point, Density, Size, Shape, and Color

5. Viscosity • Viscosity is a substance’s resistance to flowing. • The slower the liquid, the higher the viscosity. • The faster the liquid, the lower the viscosity. • Viscosity decreases when the substance is heated and increases when the substance cools down. • Examples: Maple Syrup- high viscosity vinegar- low viscosity

6. Conductivity • A material’s ability to allow heat or electricity to flow is called conductivity. • Materials that have high conductivity are called conductors. (metals)

7. Malleability and Ductile • Malleability is the ability of a solid to be flattened into a thin sheet. (copper, gold, aluminum) • Ductile is the ability of a solid to be formed into a wire. (copper)

8. Others • Hardness: How hard or soft is the substance • Melting Point: Temp. at which the substance melts. • Boiling Point: Temp. at which the substance boils • Density: The ratio of mass of a substance to its volume.

9. Recognizing Physical Changes • A physical change occurs when some of the properties of a material change, BUT the substance in the material remains the same. • Crumpling a piece of paper • Cutting a tomato • Physical changes can be reversed • Ice, water, and water vapor

10. Condense Freeze Evaporate Melt Gas Liquid Solid

11. Classification of Matter