1. Classifying Matter
Section 2.1

2. What is matter?
…everything around us!

3. Pure Substances: Element: the simplest form of matter
Atom: the smallest piece of an element
Element
Symbols

4. Pure Substances: Compound: elements combined in a “fixed proportion”
Na + Cl = NaCl
Mg + Cl = MgCl2

5. Mixtures:
Heterogeneous: parts are noticeably different

6. Mixtures: Homogeneous: parts are not easily distinguished
- Solution: one substance dissolved in another

7. Mixtures: Homogeneous: - Colloid: one substance suspended in another
(scatters light, appears cloudy)

8. Mixtures: Homogeneous or Heterogeneous?
- Suspension: one substance temporarily
suspended in another

9. Separating Mixtures: Method is determined by the size of the particles
Very small, visible particles (like in suspensions) separated by filtration

10. Separating Mixtures:
Dissolved particles (like in solutions) separated by distillation