Which substance is correctly paired with its type of bonding?
(1) nabr—nonpolar covalent(2) hcl—nonpolar covalent(3) nh3—polar covalent
(4) br2—polar covalent

(3) - polar covalent

Explanation: An ionic bond is formed  when the electrons are completely transferred.

A covalent is formed by sharing of electrons and is called as polar covalent when there is electronegativity difference among elements and non polar covalent when there is no electronegativity difference among elements.

(1) —nonpolar covalent: This forms ionic bond by transfer of electrons from to forming and respectively.

2) HCl—nonpolar covalent: This forms a polar covalent bond as the electronegative difference between hydrogen and chlorine is high.

3) -polar covalent: This forms a polar covalent bond as the electronegative difference between hydrogen and nitrogen is high.

4) —polar covalent: This forms a non polar covalent bond as there is no electronegative difference between same bromine atoms.

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.