Question

storyline 1 exam
47 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

Explanation:

Step1: Use charge balance principle

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 \(y\). Then the total positive charge is \(2x\) and the total negative charge is \(y\).

Step2: Set up charge - balance equation

We have \(2x=y\). To find the ratio of \(Cu\) to \(Br\) (\(x:y\)), from \(2x = y\), we can rewrite it as \(x:y=1:2\)

Answer:

The ratio of copper to bromine is \(1:2\)