Which of the following is a colloid

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Which of the following is a colloid

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Take a glass of water and throw in a handful of sand or dirt. Stir it and stir it and stir it. Have you made a solution? Sand and dirt do not dissolve in water, and, though it may look homogenous for a few moments, the sand or dirt gradually sinks to the bottom of the glass see figure below. Some medications are delivered as suspensions and must be mixed well before the doses measured to make sure the patient is receiving the correct amount of medication. A suspension is a heterogeneous mixture in which some of the particles settle out of the mixture upon standing. The particles in a suspension are far larger than those of a solution, so gravity is able to pull them down out of the dispersion medium water.

Which of the following is a colloid

Colloids, also known as colloidal solutions or colloidal systems, are mixtures in which microscopically dispersed insoluble particles of one substance are suspended in another substance. The size of the suspended particles in a colloid can range from 1 to nanometres 10 -9 metres. For a mixture to be classified as a colloid, its suspended particles must not settle in the manner that the particles of suspensions settle at the bottom of the container if left undisturbed. Colloidal solutions are known to exhibit the Tyndall Effect , which is a phenomenon in which beams of light incident on colloids are scattered due to the interactions between the light and the colloidal particles. Colloids usually feature substances that are evenly dispersed in another. In such mixtures, the substance that is dispersed is referred to as the dispersed phase, whereas the substance through which it is dispersed is called the continuous phase.

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As a child, you may have made suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water, known as tempera paint.

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