1. Matter pt 2

2. Categories Pure Substance - Can not by physically separated
Mixture - Two or more substances that are mixed and can be separated physically

3. Pure Substances Element - Made up of only 1 type of atom
Ex: H, O, Ca, C, Cl2
Compound - Made up of 2 or more types of atoms
Ex: H2O, CO2, H2SO4

4. Mixtures
Homogeneous Mixture: Uniform in composition throughout. Often referred to as a solution
Ex: sugar dissolved in water, air, steel sheet
Heterogeneous Mixture: Not uniform throughout
Ex: Sand, salads,

5. Physical Properties
Properties that can be observed or measured without changing the composition of matter.
Include: appearance, texture, size, color, odor, melting point, boiling point, freezing point, density, solubility.

6. Intensive vs. Extensive
Physical properties can be defined as two types: Intensive & Extensive
Extensive: Depends on the amount of matter being measured.
Ex: mass, volume, time it takes to boil
Intensive: Does not depend on the amount of matter
Ex: density, color, boiling point

7. Chemical Properties
Properties that can only be observed or measured during a chemical change/chemical reaction. Ability to change into a different (new) substance with new properties
Ex: reactivity with water, oxidation, types of bonds formed, flammability, toxicity

8. Physical Change
Physical changes affect the form of a substance, but not its chemical composition.
Does NOT change what the substance is. Can be changes in size, shape, or state
Ex: cutting, grinding, boiling, melting. Etc.

9. Chemical Change
Chemical changes is a change that results in the formation of a new substance.
Involves chemical reactions and the breaking/formation of chemical bonds
Ex: rusting, burning, tarnishing

10. Law of Conservation of Mass (Matter)
Matter can not be created nor destroyed, the atoms in a reaction are only rearranged
H O2 → H2O
5 grams grams grams