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Transcript

Pure Substances

  • PURE SUBSTANCES are Elements or Compounds
  • Uniform throughout its composition

Pure Substances

Examples

Pure Substances

Elements

Elements

  • The simplest form of matter

  • Composed of one kind of atom

  • Represented by One or two letter symbol

  • Building blocks for all other substances

  • Can not be broken down physically or chemically

Periodic

Table

The Periodic Table

Every box on the periodic table represents an element.

Models that Represent Atoms

Models that represent atoms

Compounds

Compounds

  • Made up of two or more elements chemically combined

  • Represented by chemical formulas

  • Law of Definite Composition: elements are always present in the same ratio in a compound

  • Can be Chemically separated

Compounds chemically combining

Formation & Decomposition

Compounds chemically split

Models

Models of Compounds

Element vs. Compound Summary

Summary

Which pictures represent elements? Which elements represent compounds?

Practice

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