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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