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Chem Note (英皇教育 A[1].Fung) HKCEE常

Chem Note (英皇教育 A[1].Fung) HKCEE常

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Methods of collecting gases S e 1. Upward delivery of gases = Download displacement of air S To collect gases which are lighter than air . S e e hydrogen gas e H 2 , helium gas e He neon gas e Ne, ammonia gas e NH 3 methane gas e CH 4 , carbon monoxide CO or gas in gas in 2. Downward delivery of gases ( ) = Upward displacement of air ( S ) To collect gases which are denser than air . S e e chlorine gas e Cl 2 , fluorine gas e F 2 , hydrogen chloride gas e HCl nitrogen monoxide e NO, nitrogen dioxide NO 2 carbon dioxide e CO 2 , sulphur dioxide e SO 2 gas in gas in or ** S , Molar mass of air S = 28.6 g / mol In general, air is a mixture of N 2 (78%) and O 2 (21%), the molar mass of air is about 28.6 g/mol. 7% S f 78% N 2 e 21% O 2 = 28.6 g / mol Denser gases have molar mass greater than air. ) S S Lighter gases have molar mass smaller than air. ) S S Relative atomic masse H=1.0, He=4.0, C=12.0, N=14, O=16.0, F=19.0, Ne=20.2, S=32.1 e A. Fung Tel: 23050505 www.fungsir.net Collect gases p.1
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S Notes are prepared, printed and distributed by A.Fung. They are not related to King’s Glory Educational Centre.
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Unformatted text preview: ** NOT FOR SALE ** Methods of collecting gases S e 3. Displacement of water e To collect undissolved / insoluble gases Sf ** To collect undissolved / insoluble gases e H 2 , He, Ne, Ar, N 2 , O 2 ,CO, NO, H 2 S, C x H y (CH 4 ) A ** NOT to collect dissolved / soluble gasese Cl 2 , F 2 , HCl, CO 2 , NO 2 , SO 2 , NH 3 e wet gas e gas in water e 4. Using gas syringe e This method is suitable for collecting all gases and measuring the volume of gases formed . However, this method is inconvenient when to release the gas for testing . S S e gas in e gas syringe e END e Fung Sir e download www.fungsir.net e Fung Sire [email protected] [email protected] e A. Fung Tel: 23050505 www.fungsir.net Collect gases p.2 Notes are prepared, printed and distributed by A.Fung. They are not related to King’s Glory Educational Centre. ** NOT FOR SALE **...
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