Question

question 5 (0.5 points)
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the correct formulas for copper(ll)bromide and copper(l)oxide are:

1. cobr and coo
2. cubr and cuo₂
3. cubr₂ and cu₂o
4. cobr₂ and co₂o

Explanation:

• Copper(II) Bromide:
• The symbol for copper is \(Cu\).
• Bromide ion is \(Br^-\).
• Copper has a charge of \(+ 2\) (from \(II\)).
• Using the criss - cross method (charge of copper becomes subscript of bromide and vice - versa, but since charge of bromide is \(1\), formula is \(CuBr_2\)).
• Copper(I) Oxide:
• Copper symbol is \(Cu\).
• Oxide ion is \(O^{2 - }\).
• Copper has a charge of \(+1\) (from \(I\)).
• Using criss - cross method (charge of oxide (\(2\)) becomes subscript of copper and charge of copper (\(1\)) becomes subscript of oxide), formula is \(Cu_2O\).

Answer:

1. \(CuBr_2\) and \(Cu_2O\)