Labotary Terms

• Equipments

  • test tube
  • boiling tube
  • beaker
  • connical flask
  • measuring cylinder
  • graduated breaker
  • evaporating dish
  • condenser
  • bunsen burner
  • tripod
  • gauze
  • filter funnel
  • eye protection
  • clamp & stand
  • burette
  • syringe
• Variables

  Controlled:

  • stays same
  • no limit

  Independent:

  • changes
  • only 1

  Dependent:

  • changes on I.D (results)
  • only 1
• Pure substances

  • Elements and compounds
  • NOT mixtures
• Impure substances

  2 or more substances mixed together

  • eg: milk, honey, alloy

  NOT chemically bonded!!!
• Purity criteria

  • Fixed melting pt
  • Fixed boiling pt
  • Density
  • Specific gravity

  Impurities will:

  • Lower melting/boiling pt