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Final answer:Thesubstances can be classifiedas either heterogeneous mixtures, homogeneous mixtures/solutions, or pure substances.Explanation:The substances can be classified as follows:sand & salt mixture: heterogeneous mixturesalt water: homogeneous mixture/solutionpure water: homogeneous mixture/solutiontossed salad: heterogeneous mixturehydrogen: pure substance/elementunfiltered air: heterogeneous mixturean apple: heterogeneous mixturegranite: heterogeneous mixtureiron: pure substance/elementiron with rust: heterogeneous mixturenitric acid: pure substance/compoundwood: heterogeneous mixtureAheterogeneous mixtureis a combination of substances that are not evenly distributed and can be seen as separate components. Ahomogeneous mixture, also known as a solution, is a combination of substances that are uniformly distributed and cannot be visibly distinguished. Apure substanceis either an element, made up of only one type of atom, or a compound, made up of two or more elements chemically bonded together.Learn more about classification of substances here:brainly.com/question/32346062#SPJ11...