1. Properties of Matter
Prof. Bixler

2. 4.1 Properties of Substances
Properties are characteristics of a substance that give it a unique identity
Physical Properties are the inherit characteristics of a substance that can be determined without altering its composition like physical state, density, melting and boiling points, color, taste and odor

3. Name the Physical Properties

4. Chemical Properties
Chemical Properties = describe the ability of a substance to form new substances either by reaction with other substances or by decomposition
Reactivity or lack thereof of a substance with another is a chemical property
No two substances have exactly the same physical and chemical properties

5. Change Physical Change: effect changes of physical properties only
Ex. Cutting, bending, melting, boiling, separating, density measurement
Chemical Change: occurs when new substances are formed that have different properties and composition than the original substance
Ex. Burning, reacting, baking, exploding

6. Chemical or Physical Change?

7. Chemical Reactions (RXN)
Chemical change is expressed in the form of chemical equations
Chemical change = chemical reaction (rxn)
Reactants= what you begin with (left of the arrow in a chemical equation)
Products = what you end with (right of the chemical equation)

8. Laws of Conservation of Matter and Energy
Law of Conservation of Matter states that no change is observed in the total mass of the substances involved in a a chemical change
OR the mass of reactants = mass of products
Law of Conservation of Energy states that energy can neither be created nor destroyed though it can be can be changed to another form

9. Energy Energy is the capacity to do work There are two major forms
Potential energy: stored energy or energy something possesses due to its position
Kinetic energy: energy in motion
Heat: is measured in Joules in the metric system, but calorie is the unit you are most familiar with
1 calorie = 4.18 Joules
1,000 calorie = 1 nutritional Calorie = 1 kcal

10. Energy in Reactions
Heat given off is called exothermic and could be written in a chemical equation as a product
Heat may be absorbed in a reaction and would be written as a reactant.

11. Is it endothermic or exothermic?