Question

1. which molecule is an example of a non - polar molecule? a. hydrogen chloride (hcl) b. methane (ch₄) c. ammonia (nh₃) d. water (h₂o)

Explanation:

Polarity depends on electronegativity differences and molecular geometry. In HCl, there is a significant electronegativity difference between H and Cl, making it polar. Ammonia ($NH_3$) has a trigonal - pyramidal shape and a net dipole moment due to the lone - pair on nitrogen, so it is polar. Water ($H_2O$) has a bent shape and a large electronegativity difference between O and H, making it polar. Methane ($CH_4$) has a tetrahedral geometry and symmetrical distribution of charge, resulting in a non - polar molecule.

Answer:

B. Methane ($CH_4$)