Which of the following is a substance: table salt, seawater, or sand? Explain how you know.

1 answer:

6 0

TABLE SALT IS A SUBSTANCE.
In chemistry, a substance refers to a matter which has specific composition and specific properties which do not change. A substance can be an element or a compound. A substance typically has a constant composition, which can not be separated by physical methods.
In the question given above, table salt is an example of a chemical substance because, it has a constant specific composition and its components can not be separated by physical methods.
Seawater and sand are not substances, because they have varied compositions and their components can be separated by physical methods.

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Answer: Crystallization is a technique which chemists use to purify solid compounds. Crystals often form in nature when liquids cool and start to harden. Certain molecules in the liquid gather together as they attempt to become stable. They do this in a uniform and repeating pattern that forms the crystal. The process is based on the principles of solubility: compounds (solutes) tend to be more soluble in hot liquids (solvents) than they are in cold liquids. If a saturated hot solution is allowed to <u>cool</u>, the solute is no longer soluble in the solvent and forms crystals of pure compound. Impurities are excluded from the growing crystals and the pure solid crystals can be separated from the dissolved impurities by filtration.
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