How can i differentiate between ionic compounds, molecular compounds, and acids given only the formula? i need to be able to find the difference between an ionic compound, a molecular (or covalent) compound, and an acid given only the chemical formula (no charges or roman numerals)?

You can differentiate between ionic, covalent and molecular compounds by the fact that ionic compounds contain elements that include both a metal and a nonmetal. Molecular compounds contain both non metals covalently bonded to each other. While acids most often on their chemical formula start with the element of Hydrogen - H.

For Eg - sulphuric acid
H2SO4
hydrochloric acid - HCl.

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