Complete the exercises below. Give the chemical formula for: a. hydrocyanic acid, b. nickel tetracarbonyl, c. barium bicarbonate, d. calcium acetylide, e. potassium carbonate.

Chemical nomenclature is the system of naming chemical compounds based on their composition and structure. It follows specific rules set by organizations like IUPAC, which help in identifying the type of elements involved and their arrangement. Understanding nomenclature is essential for translating names into chemical formulas and vice versa.

Polyatomic ions are charged entities composed of two or more atoms covalently bonded together, which function as a single ion. Common examples include bicarbonate (HCO3-) and carbonate (CO3^2-). Recognizing these ions is crucial for writing correct chemical formulas, especially for compounds that contain them.

Valency refers to the combining capacity of an element, often determined by the number of electrons it can lose, gain, or share to form chemical bonds. Oxidation states indicate the degree of oxidation of an atom in a compound. Understanding these concepts is vital for determining the correct ratios of elements in chemical formulas, ensuring that the overall charge is balanced.