rest of term 1

• Elements, Compounds & Mixtures


  • Elements
  • Compounds
  • Mixtures
• Element


  Pure substance that cannot be broken down or made simpler
• When writing an element, the first letter is capital and any other letters are lowercase
• Compound


  Two or more elements chemically combined
• Compound


  • H2O
• Mixture


  Two or more different substances mingled with each other but not chemically combined
• Density


  Mass (kg) / Volume (cm³)
• Density is measured in g/cm³ or kg/m³
• Solid density is less than liquid density


  An object will float in a liquid
• Density = Mass / Volume
• Anything that takes up space and has mass is matter
• States of matter


  • Solid
  • Liquid
  • Gas
• Change of state


  1. Melting

  2. Boiling

  3. Condensation
• Melting point


  Temperature at which a solid changes to a liquid
• Physical change


  A change you can see and reverse
• Chemical change


  A change that is difficult to reverse
• Conservation of mass - stays the same even if state changes