Is vinegar a chemical substance or a mixture?
Vinegar is a homogenous mixture of acetic acid and water. As the mixture created has only one phase it is a solution.
Mixtures are created by mixing two or more chemical substances. If the result has more than one phase it is referred to as a mixture else it is called a solution. In chemistry a substance refers to something that has consistent chemical and physical properties and which cannot be separated into smaller units without breaking chemical bonds. In the case of vinegar water is the solvent and acetic acid is the solute. There are no chemical bonds created between water and the acid and it is possible to separate the two without breaking any chemical bonds.