Question

1. write the formula for ammonium chromate (0.5 points) *

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1. what do you call negatively charged ions? (0.5 points) *

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1. write the formula for gallium sulfide. (0.5 points) *

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Explanation:

Step1: Determine the ions

Ammonium ion is \(NH_4^+\) and chromate ion is \(CrO_4^{2 -}\).

Step2: Balance the charges

To balance the +1 charge of \(NH_4^+\) and -2 charge of \(CrO_4^{2 -}\), we need 2 \(NH_4^+\) ions.

Negatively charged ions are named based on their charge.

Step1: Determine the ions

Gallium forms \(Ga^{3+}\) ion and sulfide is \(S^{2 -}\) ion.

Step2: Balance the charges

To balance +3 and -2 charges, using the criss - cross method (swap the magnitudes of charges as sub - scripts), we get \(Ga_2S_3\).

Answer:

\((NH_4)_2CrO_4\)