Question

Also state reasons to explain why covalent compounds:
(i) are bad conductors of electricity?
(ii) have low melting and boiling points?​

Answer 1

Answer:

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Explanation:

(i) Covalent compounds are bad conductors of electricity because they are formed by sharing of electrons. So they don't have any free electron that is required for carrying electricity. Thus they are bad conductors of electricity.

(ii) CovaLent compounds are formed by the sharing of electrons, hence the intermolecular forces are relatively weaker than the electrostatic forces existing between the ionic compounds that are formed by the transferring of electrons. Due to the weak intermolecular forces, less energy is needed to break the covalent bonds hence they have low melting and boiling points

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Answer 2

Answer + Reason + Explaination

1) first of all the question arises what makes a material good or bad conductor ?

The answer is very simple presence or absence of free electrons in their valence shell.

Now in case of the the compounds having covalent bond in them they do not have free electrons as the bond is formed by sharing of the electron pair so there is no electron of their own which could be loosely help and can be used for the purpose of conduction of electricity this makes them the bad conductor of electricity and therefore they show poor conduction. Hence electricity transfer is interrupted in them.

So it can be said that covalent compounds are poor conductor of electricity

b) If we talk about the ionic compounds they have very strong intermolecular forces of attraction between the atoms so it is always that large amount of energy will be required to break their bonds but in case of covalent compound the case is just reverse there is very weak force of attraction between the atoms present in the covalent compounds because their join with weak forces like London dispersion forces or van der wall Force.

So the bond formed between them would be easily break just with the small amount of heat supplied because of this they have very low boiling point as well as the melting point because very less energy will be required to obtain them in the steam form or in the form that is for boiling as well as cooling.