Practicalchemical:
Ithinkthatchemistryisaveryinterestingandimportantpracticaldisciplinesandscientificfields.Itexistsinourlivesallthetime.Therearealreadyhundredsofdifferentphysiologicalandchemicalactivitiesjustinyourbody:redbloodcellstransportoxygen,DNAreplication,digestionandabsorption...theuseofthechemicalcanalsomanufactureofnuclearweapons,avarietyofdrugs,plasticsandallsortsofindustrialsuppliesforhumanneed.Chemistryalsohasmanyinterestingchemicalreactions,suchas:reductionreaction,oxidation,condensation,polymerization,esterificationandthesilvermirrorreactionetc.However,thereisdangeroftheenergyonEarthmayonedaybeconsumed,thereforechemistrycameinhandy.Solarenergynotonlyhasthe"inexhaustible,unlimitedfeatures,andthesunproducessolarenergyfarexceedstheEarthenergyconsumption,soitisalsosuperiorthanothercleanenergy.Studythephotosynthesisofgreenplants,studyfilmphoto-sensitivity,andraisedonlybeabletoefficientlyconvertsolarenergyintoelectricalenergyphotoelectricconversionmaterialsanddevices,chemicalandotherscienceandtechnologywillsolvetheproblemswearefacingahugecontribution.Soletuslearnallthescienceandtechnology,tosavethisbeautifulbutfragileEarth!