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CONCERNING COLD PACKS

CONCERNING COLD PACKS. INTRODUCTION. Examples of the use of chemical in daily life Exothermic reaction Using heat packs in cold weather Endothermic reaction Using cold packs to relieve pain and swelling. INGREDIENTS. Ingredients of a cold bag Consists of two bags Outer bag contains water

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CONCERNING COLD PACKS

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  1. CONCERNINGCOLD PACKS

  2. INTRODUCTION • Examples of the use of chemical in daily life • Exothermic reaction • Using heat packs in cold weather • Endothermic reaction • Using cold packs to relieve pain and swelling

  3. INGREDIENTS • Ingredients of a cold bag • Consists of two bags • Outer bag contains water • Inner bag (or tube) contains ammonium nitrate or sodium thiosulphate

  4. CHEMICAL PRINCIPLE • Squeeze the package and break the bags • Ammonium nitrate dissolves in water • Give an endothermic reaction • Absorb heat from the surrounding • Lower the pack’s temperature NH4NO3(s) + aq  NH4+＋(aq)+NO3-(aq) △H= +25.5 kJ mol- 1

  5. HOW DOES A COLD PACK WORK? • Injuries swell as fluid leaks from blood vessels • Cold causes vessels to constrict • Less fluid leaks from blood vessels, the less swelling • Cold also eases inflammation and muscle spasms • Thus, cold packs are very effective at reducing swelling

  6. HOW TO USE A COLD PACK? • Ready-to-use • Easily activated for emergency use where cold therapy is required • Squeezes the inner bag and release the water into the crystals in the outer bag • It will reach 0 degrees Celsius • Cold lasts from about 20-40 minutes • Apply cold packs for periods of up to 20 minutes every two to four hours

  7. APPLICATIONS • Help to relieve pain and swelling • For preservation of amputated limb • For first-aid treatment on sport injuries • Insect bites, small burns, and repetitive strain injuries • Help people with muscle spasms, chronic back pain, and various forms of arthritis

  8. GROUP MEMBERS ABBY LAU VIVIAN TANG AMY WONG THIS IS THE END OF THE PRESENTATION HOPE YOU ENJOY IT AND HAVE A NICE DAY!

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