Chemical Changes

• Signs of chemical changes:

  • pH changes
  • Temperature changes
  • Sound
  • Colour change
  • Effervescing
  • Mass change
  • State change
• • Endothermic - process that absorbs energy (light or heat).
  • E.G. photosynthesis, melting of an ice cube.
• • Exothermic = process that releases energy (light or heat).
  • E.G. combustion, reaction between water and calcium oxide.
• Effervescence - fizzing or bubbling.