1. Matter and Change
2.1 Properties of Matter

2. SUBSTANCE Matter with a uniform and definite composition
Examples: Elements, Compounds
Nonexamples: anything where there is more of something in a certain area (soil, oil and vinegar, etc.)

3. PHYSICAL PROPERTY
A quality or condition that can be observed or measured without changing the substance’s composition.
Examples: state, color, melting/boiling point, etc.

4. PHYSICAL CHANGE Reversible or Irreversible
Boil, freeze, melt, condense (ALL PHASE CHANGES)
Break, split, grind, cut, and crush, etc.

5. SOLIDS vs. LIQUIDS vs. GASES
STATE
Easy to Compress?
Flows?
Definite Volume?
Definite Shape?
SOLID
LIQUID
GAS
MOVEMENT? Click

6. Vapor A gas that is usually a solid or liquid at room temperature
We say “water VAPOR” because water is usually a liquid at room temperature

7. Chapter 2
2.2 Mixtures

8. MIXTURE DEF. Physical blend of two or more components HOMOGENEOUS
HETEROGENEOUS

9. Heterogeneous “Hetero” means different
Composition is NOT uniform throughout
Two or more phases
Examples: Oil and vinegar, pepperoni pizza, salad, chicken noodle soup, etc.

10. Homogeneous “Homo” means same Composition IS uniform throughout
One phase
Examples: Kool Aid, Vinegar and water, stainless steel,food coloring in water, etc.
(most are liquids)

11. You Try…

12. 2.3 Elements and Compounds
Chapter 2
2.3 Elements and Compounds

13. Elements Vs. Compounds Element: Simplest form of matter
Example: C, Al, Mg, Au, Na, etc.
Compound: More than one element chemically combined in a fixed proportion
Example: NaCl, H2O, K3N
Elements = symbol, Compound = Formula

14. **Compounds can be broken down chemically, elements can’t.
Elements can not be broken down
Compounds have different chemical properties than their component elements

15. Chemical Change There is a new chemical composition after the change
Test composition before and after the change to determine if a chemical change has occurred!!!!

17. Chapter 2
2.4 Chemical Reactions

18. Chemical Property
The ability of a substance to undergo a specific chemical change
****Burn, rot, rust, decompose, ferment, explode, and corrode

19. Chemical Change
Composition of matter ALWAYS changes
Test composition before and after the change to determine if a chemical change has occurred!!!!

20. Important Terms Reactant: Present before reaction
Product: Produced in a reaction

21. Clues Transfer of Energy Change in Color Production of Gas
Formation of Precipitate

22. Law of Conservation of Mass
Mass of the products is always equal to the mass of the reactants
In physical AND chemical changes