1. Chapter 4 – Physical Properties
Glass & Soil
Section 1 Pg

2. Objectives
Define and distinguish the physical and chemical properties of matter.
Understand how to use the basic units of the metric system
Define and understand the property of density

3. Physical vs. Chemical
Physical properties = describe a substance without references to any other substances
Chemical properties = describe the behavior of a substance when it reacts or combines with another substance

4. Metric System 1791 devised by French Academy of Science
Uses a simple decimal relationship
Easy to convert units into subunits by multiplying or dividing
Metric conversions are carried out by moving the decimal point to the right or left and inserting proper prefix
Base units = length, mass, & volume
Meter, gram, liter

5. Physical Properties Temperature – Fahrenheit & Celsius scales
Science uses Celsius scale
Water boils at 212 F and 100 C
Water freezes as 32 F and 0 C
Weight & Mass
Weight = force with which gravity attracts a body
Mass = amount of matter an object contains
Mass never changes but weight can change depending on location

6. Density Mass per unit of volume
Intensive property = same regardless of the size of substance
Easily measured by filling a cylinder with a known volume of water (V1), adding object (m), measuring new volume (V2)
m divided by V2-V1

7. Density continued
Volume of gases and liquids vary considerably with temperature
Solid object will either sink, float, or remain suspended when immersed in a liquid
Sink = greater density
Float = lower density
Suspended = similar/same density

8. In-Class Assignment/Homework