Elements Compounds and Mixtures

Elements

• Simplest substance
• Atoms
  • Noble gas
  • Metal
• Molecule
  • E.g.

Compound

• 2 or more elements chemically combined
• Can be reversed to element/decomposed with energy such as electricity
• Molecules:
• Ions:

Mixture

• Physically mixed, NOT chemically combined
• Characteristics of what forms it
  • E.g. Add salt to water to boil faster, increase boiling point
• E.g.:
  • Crude oil (Composition of compounds)
  • Alloy
    • Steel = Iron + Carbon
    • Stainless Steel = Steel + Chromium + Nickel
    • Brass = Copper + Zinc
    • Bronze = Copper + Tin
    • Solder = Lead + Tin
• Separation Methods:
  • Solubility
  • Boiling point & Melting point
  • Density