Question

part c
enter the formula for the compound beryllium oxide
express your answer as a chemical formula.
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a chemical reaction does not occur for this question
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part d
enter the formula for the compound cobalt(ii) phosphate
express your answer as a chemical formula.
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Explanation:

Step1: Determine beryllium and oxygen charges

Beryllium (Be) is in group 2, so it has a +2 charge ($Be^{2 +}$), oxygen (O) in group 16 has a - 2 charge ($O^{2-}$).

Step2: Write the chemical formula

The charges balance in a 1:1 ratio. So the formula is $BeO$.

Step3: Determine cobalt and phosphate charges

Cobalt(II) has a +2 charge ($Co^{2+}$), phosphate ion is $PO_{4}^{3 -}$.

Step4: Balance charges for cobalt(II) phosphate

To balance the charges, we need 3 cobalt ions ($3\times+ 2=+6$) and 2 phosphate ions ($2\times - 3=-6$). The formula is $Co_{3}(PO_{4})_{2}$.

Answer:

Part C: $BeO$
Part D: $Co_{3}(PO_{4})_{2}$