Final answer:
The incorrectly written chemical formulas in the list are CaNO3, MgOH2, and Ca2(PO4)3. The correct formulas are Ca(NO3)2 for calcium nitrate, Mg(OH)2 for magnesium hydroxide, and Ca3(PO4)2 for calcium phosphate.
Step-by-step explanation:
The question is about identifying incorrectly written chemical formulas from a given list. To determine if a chemical formula is correctly written, we need to consider the ion charges and the stoichiometry that results in a neutral compound.
- CaN O₃: Calcium nitrate should be written as Ca(NO₃)2 because nitrate (NO₃-) has a charge of -1 and calcium (Ca2+) has a charge of +2, so two nitrate ions are needed to balance one calcium ion.
- Mg OH₂: This is an incorrect formula for magnesium hydroxide. The correct formula is Mg(OH)2 because hydroxide (OH-) has a charge of -1 and magnesium (Mg2+) has a charge of +2, so two hydroxide ions are needed to balance one magnesium ion.
- Ca₂ (PO₄)₃: This is an incorrect formula for calcium phosphate. The correct formula is Ca3(PO4)2 because phosphate (PO4)3- has a charge of -3 and calcium (Ca2+) has a charge of +2. Three calcium ions are needed to balance two phosphate ions to create a neutral compound.
The correct chemical formulas for sodium phosphide, iron (II) nitrite, calcium hydrogen phosphate, and chromium (III) oxide are Na3P, Fe(NO2)2, CaHPO4, and Cr2O3, respectively.