Science

• What is the air that we breathe classified as?

  Impure substance
• What defines a pure substance?

  Has only one particle or compound
• What is salt made of?

  Sodium chloride
• What is an impure substance?

  Made up of two or more substances
• What is crystallization?

  • Similar to evaporation
  • Done over a long period
  • Produces large crystals
• What is a solution?

  A mixture with a solute dissolved in liquid
• What is the term for the liquid in a solution?

  Solvent
• What is evaporation?

  Liquid turning into gas below boiling point
• What is the term for a solution with maximum solute?

  Saturated solution
• What is the dish used for evaporation?

  Evaporating basin
• How can you get the largest crystals when evaporating a solution?

  Warm the solution gently for a long time
• What should be used to heat a solution?

  Bunsen burner
• What is the solid that dissolves to make a solution called?

  Solute
• What is a solution?

  • A mixture
  • A substance dissolves in a liquid
• What is distillation?

  A separation technique for solvents
• What cools down the hot gas in distillation?

  The condenser
• What does distillation involve?

  Boiling water and condensing vapor
• When is filtration used?

  To separate solids from liquids
• What is the liquid that passes through filter paper called?

  Filtrate
• What are cooling curves used for?

  To determine temperatures during phase changes
• What is the boiling point of water?

  100°C
• What is chromatography?

  A separation technique for soluble mixtures
• What can be used in chromatography?

  Food colorings, ink, pigments
• What does standard chromatography indicate?

  If a substance is pure or impure
• What happens in filtration?

  Liquid passes through paper, solid remains
• Why do sand particles pass through a sieve but stones do not?

  Sand particles are small enough to go through
• What is a solute?

  The solid that dissolves in a solution