there are 3 unknown substances a, b, and c that need to be classified as an element, mixture or compound
In order to classify the substances as an element, mixture, or compound, we need more information about their composition. Elements are made up of only one type of atom, mixtures are made up of two or more substances physically combined, and compounds are made up of two or more elements chemically combined in fixed proportions.
Without knowing the composition of substances a, b, and c, we cannot determine their classification. We would need to conduct further analysis, such as chemical testing or spectroscopy, to determine the composition of these substances.