1. Describing Matter Section 2 Chapter 1

2. Physical Properties =Properties of matter that can be observed or measured without changing the original matter Thermal Conductivity (heat transfer) State (solid, liquid, gas, plasma) Malleability (to flatten with a hammer) Ductility (ability to be pulled into a wire) Solubility (to dissolve into another substance) Density (amount of matter in a space, g/cm3)

3. Physical Change examples heating up a cup in the microwave Freezing water, boiling water, melting ice Flattening paper pulp or aluminum Pulling copper into a wire putting sugar into tea – yummy g/mL or g/cm3, size of piece does not matter

4. Density The amount of matter in a given space or volume (D) density (V) volume (m) mass

5. Density of Some Common Substances Substancedensity (g/cm3) wood (oak)0.85 aluminum2.7 silver10.5 steel7.8 silver10.5 lead13.5 Iron pyrite (solid)5.02 water1.00 copper8.96 gold19.3

6. Chemical Properties Describe a substance based on its ability to change into a new substance

7. Chemical Change = when 1 or more substances are changed into an entirely new substance with different properties.

8. Chemical Properties: Flammability Solubility Reactivity to Acid or Base, Water, Oxygen

9. Signs that a chemical reaction has occurred Bubbles/fizz  gas formation Change of color Change of temperature Change of smell Production of sound or light

10. Physical Changes Chemical Changes Aluminum foil is cut in half.Milk goes sour. Clay is molded into a new shape.Jewelry tarnishes. Butter softens on warm toast. Bread becomes toast. Butter melts. Water evaporates from the surface of the ocean. Rust forms on a nail left outside. A juice box in the freezer freezes.Gasoline is ignited. Rubbing alcohol evaporates on your hand.Hydrogen peroxide bubbles in a cut. Food scraps are turned into compost in a compost pile. A match is lit. You take an antacid to settle your stomach. Your body digests food. You fry an egg. Physical vs. Chemical

11. Can Chemical Changes be Undone? Sometimes. Chemical changes can seldomly be reversed. Chemical changes may sometimes be reversed with other chemical changes.

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