Ionic Equations and Hazards

• In an ionic equation

  only the reacting particles

  (and the products they form)

  are included
• How to write an ionic equation

  • anything that's ionic and aqueous will break into ions in solution
  • so write out with AQ ions separately
  • cross out anything the same on BOTH sides
  • so overall charge is the same
• Hazard

  Anything that has the potential to cause harm or damage
• Risk

  Probability of someone or something being harmed if exposed to a hzard
• Oxidising

  • provides oxygen which allows other materials to burn more fiercely
  • eg. liquid oxygen

  LOOKS LIKE: a circle on fire
• Toxic

  • can acuse death by eg. swallowing, breathing in, absorption
  • eg hydrogen cyanide

  LOOKS LIKE: skull and cross bones
• Highly Flammable

  • catches fire easily
  • eg. petrol

  LOOKS LIKE: line on fire
• Environmental Hazard

  • harmful to organisms snd environment
  • eg. mercury

  LOOKS LIKE: tree and dead fish
• Harmful

  • can cause irritation, reddening or blistering of the skin
  • eg. bleach

  LOOKS LIKE: !
• Corrosive

  • destroys materials, including living tissue (eg. eyes, skin)
  • eg. concentrated sulfuric acid

  LOOKS LIKE: two test tubes burning throw a hand and rectangle
• Risks:

  • associated with chemicals
  • associated with equipment
• When planning an experiment, you need to...

  • identify all the hazards and the risks from hazards, including
  • working out how likely it is that something will go wrong
  • how serious it would be if it did
  • produce risk assessment
  • suggestions to reduce risk
  • eg. wear protection, use low concentrations