Classifying Matter Section 2.1.

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Presentation transcript:

Classifying Matter Section 2.1

What is matter? …everything around us!

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

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

Mixtures: Heterogeneous: parts are noticeably different

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

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

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

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

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