A.3.1 - Important examples of chemical change

• Writing chemical formulas

  • Reactants -> products
• • Products have different properties than reactants
• Chemical change

  • C olour change
  • A roma change
  • G as formation
  • E mission of light
  • S olid formation
• Exothermic reaction - energy release

  • surroundings are hotter
• Endothermic reaction - energy absorb

  • surroundings are colder
• Biochemical reactions - happen inside an organism, can be exothermic or endothermic