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MASS SPECTRA/4

QuestionAnswer
OXIDES OF NITROGEN AND GREENHOUSE GASES, NITRIC OXIDE NO, IS PRODUCED BY... LIGHTENING AND SOIL BACTERIA. THE MAIN ANTHROPOGENIC SOURCES OF AND COMBUSTION OF FUEL IN CARS/AEROPLANE ENGINES.
AT HIGH TEMPS OXYGEN AND NITROGEN REACT TO ... PRODUCE à N2 + O2 à 2NO
MOST NO IS REMOVED FROM CARS BY.... CATALYTIC CONVERTS
IN JET ENGINE NO... RELEASED INTO THE ATMOSPHERE. CFCS AND HCFCA ARE POTENT GREENHOUSE GASES. ONLY PRODUCED ANTHROPOGENICALLY,
A IS SULPHUR HEXAFLUORIDE WHICH IS USED IN MANUFACTURE OF MAGNESIUM.
ALTHOUGH CFCS NO LONGER PRODUCED SOME STILL IN.... THE UPPER ATMOSPHERE BRUH.
HCFCS ARE PRODUCED AS .... REFRIGERANTS AND CAN ESCAPE.
CO2 FORM FOSSIL FUELS COMBUSTION HAS ... HIGHEST PROPORTIONS OF GREENHOUSE GASSES EMISSIONS.
WHEN REFERING TO GREENHOUSE GAS YOU HAVE TO CONSIDER THE... EFFECTIVENESS IN ABSORBING INFRARED RADIATION AND THE TIME THE GAS SPENDS IN THE ATMOSPHERE BEFORE BEING REACTED OR DEPOSITED ON THE EARTH’S SURFACE.
METHANE ABSORBS MORE RADIATION PER MOLE THAN... C02.
OXIDES OF NITROGEN AND HCFCS ARE MORE... POWERFUL ABSORBERS.
GLOBAL WARMING POTENTIAL (GWP)... OF EACH GAS.
(GWP) IS BASED ON THE ABILITY.... THE GAS HAS TO ABSORBED INFRARED AND THE EXTENT TO WHICH IT CAN BE REMOVED.
C02 IS USED AS STANDARD AND GIVEN GWP RATING... OF 1.
GWP OF METHANE... = 20, NO = 300.
IF THE GLOBAL WARMING POTENTIAL AND CONCENTRATIONS OF GASES ARE KNOWN.... THE EFFECT OF THE ENVIRONMENT CAN BE CALCULATED.
THE TOTAL C02 EMISSIONS ACCOUNT FOR WHAT %... 84% OF THE GREENHOUSE GAS EMMMISIONS, BUT THE EFFECT OF C02 IS ONLY 50% COZ OF THE LOWER GWP.
WATER VAPOUR ACCOUNTS TO WHAT %... 95% OF THE TOTAL GREENHOUSE EFFECT.
ONLY 3% OF THE C02 IN THE ATM IS ... OF ANTHROPOGENIC ORIGIN. CO2 CONTRIBUTES JUST 0.1% TO THE TOTAL GREENHOUSE EFFECT.
CONTRIBUTION OF GREENHOUSE AFFECT (%) ... WATER VAPOUR: 94.6 ,CO2 – 3.8, METHANE=1.1,NO =0.5 , OTHERS <0.1.
INFRARED SPECTROSCOPY IS THE... MEASURE THE AMOUNTS OF RADIATION ABSORBED , THOSE THIS BY SPLITTING THE INCIDENT BEAM INTO 2.ONE BEAM PASSED THROUGH A CELL CONTAIN A REFERENCE SAMPLE (USUALLY SOLVENT) AND
THEN GOES TO THE DETECTOR;
IN INFRARED SPEC THE OTHER GOES ... THROUGH THE DISSOLVED SAMPLE TO THE DETECTOR. THE DIFF BETWEEN THE 2 AMOUNTS OF RADIATION ARRIVING AT THE DETECTOR IS THE AMOUNT ABSORBED BY THE CHEMICAL.
THE ANGLE OF DIFFRACTION GRATING IS SLOWLY ALTERED IN INFRED SPEC WHY.... SO THAT THE DIFF FREQUENCIES SWEEP THROUGH THE APPARATUS.
INFRED SPEC PROCESS... 1ST IS THE IR SOURCE à SLITS à SAMPLE àSOLVENT àDIFFRACTION GRATING à DETECTORà COMPUTER.
DIFFERENT BONDS IN A COVALENT MOLECULE ABSORBS RADIATION OF.... DIFF FREQUENCIES, WHICH ARE MEASURED IN WAVE NUMBERS (FOR CHEMISTRY) (NM FOR PHYSICS).
Created by: ufuoma
 

 



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