Question

question 15 (1 point)
write the chemical formula for each ternary ionic compound
lithium chromate

question 16 (1 point)
write the chemical formula for each ternary ionic compound
cobalt (ii) nitrate

Explanation:

Step1: Determine the ions

• Lithium ion (\(Li^+\)) has a charge of \(+1\). Chromate ion (\(CrO_4^{2 -}\)) has a charge of \(- 2\).
• Cobalt (II) ion (\(Co^{2+}\)) has a charge of \(+2\). Nitrate ion (\(NO_3^-\)) has a charge of \(-1\).

Step2: Apply charge - balance

• For lithium chromate: To balance the charges (\(+1\) and \(-2\)), we need \(2\) \(Li^+\) ions for each \(CrO_4^{2 -}\) ion.
• For cobalt (II) nitrate: To balance the charges (\(+2\) and \(-1\)), we need \(2\) \(NO_3^-\) ions for each \(Co^{2+}\) ion.

Answer:

• Lithium chromate: \(Li_2CrO_4\)
• Cobalt (II) nitrate: \(Co(NO_3)_2\)