Quiz 2 on alkane and alkene

With answers

1) State 5 physical properties of ethane ( 5 marks)•…………………………………………………………………………………•………………………………………………………………………………….•…………………………………………………………………………………•…………………………………………………………………………………2) Chemical properties of alkanes (20 marks)a) Write chemical equation for complete combustion of methane ………………………………………………………………………………………….b) Write BOTH STRUCTURAL AND MOLECULAR equations for substitution reaction of methaneStep 1 …………………………………………………………………………Step 2 ………………………………………………………………………………Step 3 …………………………………………………………………………………Step 4 …………………………………………………………………………………

3) State 5 physical properties of ethene ( 5 marks) •…………………………………………………………………………………•………………………………………………………………………………….•…………………………………………………………………………………•…………………………………………………………………………………•……………………………………………………………………………….4) Chemical properties of alkenes ( 20 marks) Write BOTH STRUCTURAL AND MOLECULAR equations for ADDITIONAL REACTION of ethene•Addition of hydrogen ………………………………………………………………………………..•Addition of bromine ………………………………………………………………………………..•Addition of hydrogen chloride ………………………………………………………………….•Addition of water ………………………………………………………………………………………•Addition of hydroxyl group (oxidation with KMnO4 acidified)…………………end

answers

•State 5 physical properties of ethane

•Low melting and boiling point•Low density•Not soluble in water•Soluble in organic solvent•Cannot conduct electricity

Chemical properties of alkanes (20 m)a) Write chemical equation for

complete combustion of methane

OHCOOCH 2224 22

Correct reactant = 2m

Correct product = 2m

Write BOTH STRUCTURAL AND MOLECULAR equations for

substitution reaction of methane

Step 1CH4 + Cl2 ---------> CH3Cl + HCl

step 2CH3Cl + Cl2 -------> CH2Cl2 + HCl

Step 3CH2Cl2 + Cl2 ---------> CHCl3 + HCl

ClCl step 4

CHCl3 + Cl2 -------> CCl4 + HCl

•State 5 physical properties of ethene

•Low melting and boiling point•Low density•Not soluble in water•Soluble in organic solvent•Cannot conduct electricity

ADDITIONAL REACTION of ethene•Addition of hydrogen

62242 HCHHC

ADDITIONAL REACTION of ethene•Addition of bromine

242242 BrHCBrHC

ADDITIONAL REACTION of ethene•Addition of hydrogen chloride

ClHCHClHC 5242

ADDITIONAL REACTION of ethene•Addition of steam

OHHCOHHC 52242

ADDITIONAL REACTION of ethene•Addition of KMnO4 acidified

242242 )(][ OHHCOOHHC