Question

ex2 1. name the following chemical formula for the following a. common salt b. sand c. ammonium d. carbon dioxide

Explanation:

Part (a): Common Salt

Common salt is sodium chloride. The chemical formula for sodium chloride is determined by the valencies of sodium (Na⁺, valency +1) and chloride (Cl⁻, valency -1). By cross - multiplying the valencies, we get the formula $NaCl$.

Sand is mainly composed of silicon dioxide. Silicon (Si) has a valency of +4 and oxygen (O) has a valency of -2. To balance the charges, we need 2 oxygen atoms for each silicon atom. So the formula is $SiO_2$.

Ammonium is a polyatomic ion with the formula $NH_4^+$. It is formed when ammonia ($NH_3$) accepts a proton ($H^+$). The structure of the ammonium ion gives it this formula.

Answer:

The chemical formula for common salt (sodium chloride) is $\boldsymbol{NaCl}$.

Part (b): Sand