Question

28 what is the chemical formula for copper(ii) nitrate? 29 what is the name of (nh₄)₂s?

Explanation:

Step1: Determine the ions

Copper(II) has a charge of \(Cu^{2+}\), nitrate has a charge of \(NO_3^-\).

Step2: Balance the charges

To balance \(2+\) (from \(Cu^{2+}\)) and \(-1\) (from \(NO_3^-\)), we need 2 \(NO_3^-\) ions.

Step3: Write the formula

The formula is \(Cu(NO_3)_2\).

Step4: Analyze \((NH_4)_2S\)

\(NH_4^+\) is the ammonium ion, \(S^{2 -}\) is the sulfide ion. There are 2 ammonium ions.

Answer:

1. \(Cu(NO_3)_2\)
2. Ammonium sulfide