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Catalyst is a substance that increases the rate of chemical reaction without undergoing permanent chemical change. it enables a chemical reaction to proceed at a usually faster rate or lower temperature/under different conditions than the other one possible. 
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hmf.. pahabol po .. heheh.. pati nqa po unq.. "OCCASIONAL DERMATITIS"? tnx.. :D
C ate AnneC na cguro sasagot nyan. matutulog na ako eh. :) alam niya yan. ;)
.. eh taqal nia po atanq maqtype ehh.. hehehhe ... #Peace po
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