Add the missing words !! (Provided is the lines and it signifies the number of words) 1.) It is the composition of all compounds -> _ _ _ _ _ 2.) It describes the crystals of ionic solids -> _ _ _ _ _ 3.) What is shared unequally in a polar bond? -> _ _ _ _ _ _ _ _ 4.) Number of shared electrons in N2 -> _ _ _ 5.) What happens to electrons in the formation of ionic bonds? -> _ _ _ _ _ _ _ _ 6.) What are these intermolecular forces that caused low melting and boiling points? -> _ _ _ _ 7.) What must be added to break bonds? -> _ _ _ _ _ _

1. Atoms

3. Electrons

4. 3 pairs

5. Complete transfer of electrons

6. London dispersion forces

7. Energy

Explanation:

Atoms are the building block from which a compound is formed so we can say that composition of compounds depends on type of atoms. Electrons are shared unequally in a polar bond due to difference in electronegativity values of bonded atoms. There are 3 pairs of electrons are shared in nitrogen molecule. The transfer of electrons occurs from one atom to another in the formation of ionic bonds. London dispersion forces are the intermolecular forces that is responsible for the low melting and boiling points of a molecule or compound. Energy is needed to break the bonds that is present between the two bonded atoms.

catya your not at all which answer i've seen you do this on another question!

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.