Which of the following mixtures best demonstrates a heterogeneous mixture at the macroscopic level?
Sand and Water
A heterogeneous mixture is one in which the components remain physically distinct and the composition is not uniform throughout - you can see or separate the individual phases at the macroscopic level. A homogeneous mixture, in contrast, has a uniform composition and appears as a single phase.
Sand and water do not mix chemically; the insoluble sand particles settle at the bottom (or remain suspended) while the water stays on top, so two clearly separate phases are visible with the naked eye. This makes it a classic heterogeneous mixture.
Nitrogen and oxygen mix as gases in a single uniform gaseous phase (this is essentially air), forming a homogeneous mixture. Salt and water and sugar and water both dissolve to give clear, uniform solutions in which the solute particles are dispersed at the molecular level, so they are also homogeneous.
Hence, the heterogeneous mixture at the macroscopic level is sand and water.
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