Question

15 select the correct answer. what is the chemical formula of calcium chloride? a. cacl b. ca₂cl₂ c. ca₂cl d. cacl₂

Explanation:

To determine the chemical formula of calcium chloride, we analyze the valencies of the ions involved. Calcium (Ca) has a valency of +2 (forms \(Ca^{2+}\) ions), and chlorine (Cl) has a valency of -1 (forms \(Cl^-\) ions). In an ionic compound, the total positive charge must equal the total negative charge. So, we need 2 chloride ions (\(Cl^-\)) to balance the +2 charge of one calcium ion (\(Ca^{2+}\)). This gives the formula \(CaCl_2\).

Answer:

D. \(CaCl_2\)