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Question

(a) Why are covalent compounds generally poor conductors of electricity?
(b) Name the following compound:

(c) Name the gas evolved when ethanoic acid is added to sodium carbonate. How would you prove the presence of this gas?

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Solution

(a) As covalent bonds do not break easily (dissociate), so they do not form ions which help in conduction of electricity. Therefore, covalent compounds don't conduct electricity as they don't have free electrons or ions.

(b) The given compound contains 3 carbons and a ketone functional group so it would be called as 'propanone'.

(c) When ethanoic acid reacts with sodium carbonate, sodium ethanoate, carbon dioxide, and water are formed.

2CH3COOH+Na2CO3ā†’CH3COONa+CO2+H2O

To test the presence of formed gas, we pass this gas from lime water. Upon reaction, lime water turns milky, which confirms the presence of carbon dioxide in the reaction.

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