1. 7/22/14 Pg. 19 in ILL

2. Matter is defined as anything that has mass and takes up space. It is made up of atoms. These atoms have certain ways they behave, look feel, smell, etc. These are known as properties. There are 3 main states of matter: solid, liquid, and gas.

3. A physical property is a characteristic of a substance that can be observed without changing the substance. It’s important to use all senses when describing physical properties. BE CAREFUL WITH TASTE!!

4. a. color (ex. black, red, colorless) b. shape (ex. square, round, irregular) c. odor—does it have a smell or is it odorless; description could be compared to something known (ex. rose, lemon, vanilla, etc.)

5. d. magnetism—can it draw, pull, or repel substances on its own e. hardness—is it rigid or resistant to pressure; is it easily scratched f. texture—what it feels like (ex. smooth, rough)

6. g. luster—the ability to reflect light (ex. dull, shiny) h. malleability—the ability to be reshaped or rolled out by pounding i. mass—amount of matter in an object; measured in grams

7. A physical property of a substance that does not change based on the amount of the substance is known as a characteristic property. Characteristic properties can be used to identify unknown substances.

8. a. density—the amount of mass per unit volume formula: density = mass/volume (D = M/V) units: g/mL (for gases and liquids) g/cm 3 (for solids)

9. b. the temperature at which a substance changes states boiling point—the temperature at which a liquid starts changing to a gas melting point—the temperature at which a solid melts to become a liquid; same temperature as the freezing point of a substance Why is mass not an example of a characteristic property?

10. Properties that can only be observed by changing the original substance into a new one are called chemical properties. These cannot be determined by just viewing or touching the substance.

11. a. flammability—how easily a substance will burn or ignite b. oxidation—when some substances are exposed to oxygen, they chemically react with it to form rust, the brown on a cut apple, etc. c. pH—how acidic or basic a substance is when dissolved in water

12. When the same substance is present before and after a change, it is known as a physical change. Examples a. melting ice b. cutting hair c. crushing a can d. breaking glass e. tearing paper

13. A chemical change takes place when a new substance with new properties is formed during the change. This type of change takes place when a chemical reaction occurs. Examples a. burning wood b. cooking an egg c. a nail rusting