Q5 of 10 Page 140

Given below are the chemical formulae of some hydrocarbons

C3H6, C2H6, C3H4


a) Represent their structure


b) Based on their structure, classify them into alkane, alkene and alkyne.

a)



(C3H6)



(C2H6)



(C3H4)


b) In C3H6, there is double bond so it is alkene.


In C2H6, there are all single bonds so it is alkane.


In C3H4, there is triple bond so it is alkyne.


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3

a) Write the chemical formula of calcium carbonate.

b) Which gas is produced when calcium carbonate reacts with acids?


c) What is the name of an aqueous solution of this gas?


d) Write any two substances that contain calcium carbonate.

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Write the chemical formula of the compounds that are missing in the homologues series given below.

A


B


C

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