A substance consisting of two or more elements in a fixed ratio.

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Multiple Choice

A substance consisting of two or more elements in a fixed ratio.

Explanation:
Think about chemical composition and bonding. When two or more elements combine in a fixed ratio and are held together by chemical bonds, the resulting substance is a compound. That fixed ratio is shown in its chemical formula, like H2O for water, where two hydrogens accompany one oxygen. An element, by contrast, is a pure substance made of one type of atom. Carbohydrate is a specific class of compounds built from carbon, hydrogen, and oxygen, so it can fit the idea of a compound but isn’t the general definition. A calorie is an energy unit, not a chemical substance. Therefore, the description best matches a compound.

Think about chemical composition and bonding. When two or more elements combine in a fixed ratio and are held together by chemical bonds, the resulting substance is a compound. That fixed ratio is shown in its chemical formula, like H2O for water, where two hydrogens accompany one oxygen. An element, by contrast, is a pure substance made of one type of atom. Carbohydrate is a specific class of compounds built from carbon, hydrogen, and oxygen, so it can fit the idea of a compound but isn’t the general definition. A calorie is an energy unit, not a chemical substance. Therefore, the description best matches a compound.

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