Question

There are different types of bonds based on electronegativity. One bond type is known as non-polar covalent. Which choice below has this bond type? A. all of the compounds B. H2 C. H2O D. NaCl

Answer 1

Answer:

H₂ has a non-polar covalent bond.

Explanation:

First, remember that a covalent bond occurs when two atoms with zero or very low difference of electronegativity share one or more pair of electrons, that's why covalent bonds are very common  between atoms of the same elements, for example in the case of H₂, where the difference of electronegativity is zero.

Also, covalent bonds are non-polar when the atoms in the bond has the same electronegativity so the electronic density is symmetric distributed.

The molecule that has those characteristics is the molecule of Hydrogen (H₂) so it has a non-polar covalent bond.

On the other side, the molecule of water (H₂O) has covalent bond between hydrogen and oxygen atoms but the oxigen atom has 2 pairs of non bonded electrons that creates a zone with high electronic density making this molecule polar (you can see those pair of non bonded electrons in red in the attachment).

Finally, the molecule of chloride sodium (NaCl) is a type of ionic bond.

Answer 2

Answer:D

Explanation: NaCl is an ionic bond which makes it polar. A polar molecule consists of atoms having either a positive or negative bond. Polar molecular bonds consist of atoms having a partial positive or partial negative charge, as molecular bonds usually only consist of nonmetals. However, ionic bonds are always polar.