Life Chemistry-Why Onion Makes Us Cry.pptx

Chemistry in daily life for Grade 7

1. CHEMISTRY DAILY LIFE ? TOPIC , WHY DO ONIONS HURTS EYES

2. WHY do onions hurts eyes ? AMINO ACID SULFOXIDE ONIONS CONSIST OF AMINO ACID SULFOXIDES

3. ONION CELL , WHEN YOU CUT AN ONION , MILLIONS OF ONIONS CELLS RAPTURE .

4. RELEASING THE AMINO ACID SULFOXIDES ALONG WITH SOME SPECIAL ENZYEMS .

5. THESE SPECIAL ENZYMES REACT WITH AMINO ACID SULFOXIDES TO FORM A CHEMICAL CALLED SYN PROPANETHIAL S OXIDE .

6. THIS CHEMICAL IS VOLATILE THAT IS , IT EASILY EVAPORATES AT NORMAL TEMPERATURE , FORMING A GAS .

7. WHEN THIS GAS REAEHES OUR EYES . IT REACTS WITH THE SUBSTANCE THAT KEEPS OUR EYES LUBRICATED AND FORMS MILD SULFURIC ACID .

8. AN ACID IN MY EYES .

9. THIS SULFURIC ACID GIVES US A BURNING SENSATION .

10. NOW , IN ORDER TO WASH OFF THIS ACID , OUR LACRIMAL GLANDS PRODUSE A DISINFECTING LIQUID . BUT WHEN OUR EYES CANNOT HOLD ANY EXTRA AMOUNT OF DISINFECTING LIQUID .

11. IT STARTS TO FALL DOWN , MAKING US CRY .

12. Thanks FOR WATCHING …