Which of the following is a property of a pure substance?
2 answers:
Answer: Option (c) is the correct answer.
Explanation:
A pure substance is defined as the substance that contains either same or different type of atoms which are chemically combined to each other in a fixed ratio by mass.
For example, both and
are pure substances.
A pure substance can only be separated by chemical means.
So, this shows that a pure substance can be made up of same elements or different type of elements that constitute a compound.
Thus, we can conclude that a property of a pure substance is that it is made up of a single element or type of compound.
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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.
For an example the salt we get from seawater can have many impurities in it. Hence, the process of crystallization is in use to remove these impurities.
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