Section 2.2
Properties of Matter
• Why are color, volume, and density classified as physical
properties?
• Why are flammability and reactivity classified as chemical
properties?
1
What are physical properties?
Physical properties are characteristics that can be observed without changing the composition of the substance.
• Physical properties can help identify substances.
• Physical properties can be observed or measured.
What are some of the physical properties of this football?
2
Examples of physical properties:
• shape
• color
• odor
• texture
• state of matter
• melting point
• boiling point
• strength
• hardness
• magnetism
• ability to conduct electricity or heat
3
What is the melting point and boiling point?
4
Name that image
5
Name that image
6
Density
• density: the ratio of an object's mass to its volume density = mass or
volume
D=m
V
• common unit of density is g/cm3
7
Which object is
MORE dense than
water and which
object is LESS dense
that water?
8
Chemical Properties
• A chemical property describes how a substance changes into a new substance, either by combining with other elements or by breaking apart into new substances.
9
• Flammability is a chemical property.
flammability: the ability to burn
• Reactivity is a chemical property.
reactivity: the capacity of a substance to combine chemically with another substance
10
Physical and chemical properties are different.
• Physical properties can be observed without changing the composition of a substance.
• Chemical properties can be observed only in situations in which the composition of the substance changes.
11
12
13
Math Practice on Density
Questions 1, 2, 3 on page 54 AND
Questions 5, 6, 7 on page 58
14