1. Chemistry

2. Properties can be classified as:
2.1
Describing Matter
Properties can be classified as:
a. Physical: malleability, conductivity, density, color, odor, volume, mass, etc…
b. Chemical: flammability, reactivity.

3. Physical Properties can be classified as:
Describing Matter
Physical Properties can be classified as:
a. Extensive: a property that depends on the amount of matter in a sample b. Intensive: a property that depends on the type of matter in a sample.

4. Properties Physical Chemical Intensive Extensive
Describing Matter
Properties
Physical Chemical
Intensive Extensive
Flammability & Reactivity
Color,Odor,Density Mass,Volume,Length

5. Extensive Properties Examples Mass Volume Weight Length
2.1
Describing Matter
Extensive Properties Examples
Mass
Volume
Weight
Length

6. Intensive Properties Examples Hardness Color Density
2.1
Describing Matter
Intensive Properties Examples
Hardness
Color
Density
Boiling/Melting Point
Odor
This bowling ball and candlepin are used in a game played mainly in New England

7. Identifying Substances
2.1
Identifying Substances
Identifying Substances
Do all samples of a substance have the same intensive properties?

8. Identifying Substances
2.1
Identifying Substances
Matter that has a uniform and definite composition is called a substance.
The copper kettles are about 150 years old.

9. Identifying Substances
2.1
Identifying Substances
This sculpture of a falcon is made of gold. Gold is an example of a substance.
This gold falcon standard from Egypt is about 3000 years old. Analyzing Data Which of the properties listed in Table 2.1 could not be used to distinguish copper from gold?

10. Identifying Substances
2.1
Identifying Substances
Every sample of a given substance has identical intensive properties because every sample has the same composition.
Examples: elements and compounds
This gold falcon standard from Egypt is about 3000 years old. Analyzing Data Which of the properties listed in Table 2.1 could not be used to distinguish copper from gold?

11. Identifying Substances
2.1
Identifying Substances
A physical property is a quality or condition of a substance that can be observed or measured without changing the substance’s composition.
Hardness, color, conductivity, and malleability are examples of physical properties.

12. Three commonly discussed states of matter are solid, liquid, and gas.
2.1
States of Matter
Three commonly discussed states of matter are solid, liquid, and gas.
(others: Plasma, Bose Einstein Condensate)

13. A solid is a form of matter that has a definite shape and volume.
2.1
States of Matter
Solids
A solid is a form of matter that has a definite shape and volume.
The arrangement of particles is different in solids, liquids, and gases. In a solid, the particles are packed closely together in a rigid arrangement.

14. 2.1
States of Matter
Liquid
A liquid is a form of matter that has an indefinite shape, flows, yet has a fixed volume.
The arrangement of particles is different in solids, liquids, and gases. In a liquid, the particles are close together, but they are free to flow past one another.

15. (indefinite shape and volume)
2.1
States of Matter
Gases
A gas is a form of matter that takes both the shape and volume of its container.
(indefinite shape and volume)
The arrangement of particles is different in solids, liquids, and gases. In a gas, the particles are relatively far apart and can move freely. Relating Cause and Effect Use the arrangements of their particles to explain the general shape and volume of solids and gases.

16. 2.1
States of Matter
Vapor describes the gaseous state of a substance that is generally a liquid or solid at room temperature, as in water vapor.

17. Physical Changes 2.1 How can physical changes be classified?

18. 2.1
Physical Changes
During a physical change, some properties of a material change, but the composition of the material does not change.
As gallium melts in a person’s hand, the shape of the sample changes, but the composition of the material does not change.
The silvery substance in the photograph is gallium, which has a melting point of 30°C. Inferring What can you infer about the temperature of the hand holding the gallium?

19. Physical changes can be classified as reversible or irreversible.
2.1
Physical Changes
Physical changes can be classified as reversible or irreversible.
All physical changes that involve a change from one state to another are reversible (evaporation, condensation, etc...)
Cutting hair, filing nails, and cracking an egg are examples of irreversible physical changes.

20. 2.1 Section Quiz.
2.1.

21. 2.1 Section Quiz.
1. Which of the following would be described as an extensive property of matter?
temperature
color
mass
hardness

22. 2.1 Section Quiz.
2. Which properties can be observed without changing the composition of a substance?
all properties of a substance
intensive properties
chemical properties
physical properties

23. 3. Match the states of matter with the following descriptions:
2.1 Section Quiz.
3. Match the states of matter with the following descriptions:
(1) takes the volume and shape of its container
(2) has a definite shape and volume
(3) has a definite volume but an indefinite shape
(1) liquid, (2) solid and (3) gas
(1) gas, (2) solid, and (3) liquid
(1) gas, (2) liquid, and (3) solid

24. END OF SHOW