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Question
What is meant by a substance?
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Solution
A substance is a kind of matter that is made up of only one type of particle (either atoms or molecules). It has a definite composition and distinct properties. A substance may be an element (e.g., oxygen, iron) or a compound (e.g., water, carbon dioxide). For example, water is a pure substance because it contains only one type of molecule, H₂O.
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