Question

storyline 1 exam
62 of 73
copper is a metal and has a cu2+ ion that reacts with a nonmetal, bromine, which has an ion of br-. predict the ratio of copper to bromine in an ionic compound assuming the ions bond in the reaction.
1|2|3|4|5
2|1|3|4|5
copper bromine

Explanation:

Step1: Determine charge balance

In an ionic compound, the total positive charge equals the total negative charge. Let the number of \(Cu^{2 +}\) ions be \(x\) and the number of \(Br^{-}\) ions be \(y\). The charge from \(Cu^{2+}\) is \(2x\) and from \(Br^{-}\) is \(-y\). So, \(2x=y\).

Step2: Find the ratio

We can rewrite \(2x = y\) as \(\frac{x}{y}=\frac{1}{2}\)

Answer:

1 copper and 2 bromine.