A teacher prepares three mixtures: sugar dissolved in water, salt dissolved in water, and sand stirred in water. Which of the following is a suspension?
Only the sand and water mixture
A suspension is a heterogeneous mixture in which insoluble solid particles are dispersed in a liquid but do not dissolve; the particles are large enough to be seen and eventually settle under gravity.
Sand does not dissolve in water. Its grains stay visible, scatter light, and gradually settle to the bottom, so the sand-water mixture is a suspension.
Sugar and salt both dissolve completely in water to give clear, homogeneous true solutions with particle sizes at the molecular or ionic level, so they are not suspensions.
Hence, only the sand and water mixture is a suspension.
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