Which term describes a substance formed by the combination of elements in a definite ratio?

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Multiple Choice

Which term describes a substance formed by the combination of elements in a definite ratio?

Explanation:
A substance formed by joining elements in a definite ratio is described by its chemical formula. A chemical formula uses symbols and numbers to show exactly how many atoms of each element are in a molecule or formula unit. This fixed ratio is what defines a particular compound, so water is written as H2O (two hydrogens for every oxygen), table salt as NaCl, and so on. A chemical equation, on the other hand, is a way to represent a reaction with reactants and products, not the fixed composition of a substance. An ionic bond is a type of bond between ions, and hydrogen is an element, not a description of a compound’s composition.

A substance formed by joining elements in a definite ratio is described by its chemical formula. A chemical formula uses symbols and numbers to show exactly how many atoms of each element are in a molecule or formula unit. This fixed ratio is what defines a particular compound, so water is written as H2O (two hydrogens for every oxygen), table salt as NaCl, and so on. A chemical equation, on the other hand, is a way to represent a reaction with reactants and products, not the fixed composition of a substance. An ionic bond is a type of bond between ions, and hydrogen is an element, not a description of a compound’s composition.

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