chemical changes

• PH 1 - 6

  • acid
  • eg - lemon juice
  • Hydrogen ions
• PH 8-14

  • alkali
  • eg - bleach
  • Hydroxide ions
• PH

  • ph probe
  • ph metre
  • indicators
• litmus paper

  • acid - red
  • alkali - blue
• phenophalin

  acid - colourless

  alkali - pink
• methyl orange

  • acid - red
  • alkali - yellow
• electrolysis

  • atoms at the anode

  lose electrons

  become ions in solution

  loses mass

  • ions move to cathode
  • ions in solution

  gain electrons

  become atoms at the cathode

  cathode gains mass