1. What do all of these things have in common?

2. What is matter? Matter is anything that has mass and volume.
Mass: the amount of matter in an object
Measure with a balance in grams.
Volume: the amount of space matter takes up
Measure with a ruler (cm3) or graduated cylinder (mL).

3. Examples of Matter
You Me
What about the air we breathe?

4. Classifying Matter: Chemical Properties
Definition:
Properties that are only observable when one substance interacts with another
Examples:
Reactivity with other chemicals, flammability, toxicity

5. Classifying Matter: Physical Properties
Definition:
Properties than can be observed or measured without changing the composition of matter.
Examples:
Color, texture, shape, mass, state of matter

6. Two Types of Physical Properties
Intensive
Definition: Properties that are independent of the amount of matter present
Examples: color and boiling point
Extensive
Definition: Properties that depend on the amount of matter present
Examples: mass, length, volume

7. Can you describe what’s happening?
Why do you sound funny when you inhale helium?

8. Density
Density is a ratio that compares the mass of an object to its volume.

9. Example!
A block has a mass of 325 g and a volume of 500 cm3, what is the density?

10. Quick “Q’s” What are the units commonly acceptable for density?
Is density a physical or chemical property?
Why?!
Do you think density is an intensive or extensive property?