Elements & Compounds & Molecules

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What is an element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen (H) and oxygen (O).

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What is a compound?

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A compound is a substance formed when two or more elements are chemically bonded together. An example is water (H2O).

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What is a molecule?

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A molecule is the smallest unit of a chemical compound that retains its chemical properties. It consists of two or more atoms bonded together.

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What is the difference between an element and a compound?

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An element is a single type of atom, while a compound consists of two or more different types of atoms chemically bonded together.

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What is the chemical symbol for oxygen?

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The chemical symbol for oxygen is O.

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What does H2O represent?

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H2O represents water, which is a compound made of two hydrogen atoms and one oxygen atom.

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What is a pure substance?

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A pure substance is a material that has a constant composition and consistent properties throughout. Elements and compounds are pure substances.

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What is the formula for carbon dioxide?

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The formula for carbon dioxide is CO2, which consists of one carbon atom and two oxygen atoms.

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What happens when atoms combine?

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When atoms combine, they form molecules or compounds through chemical bonds.

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What is the chemical formula for glucose?

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The chemical formula for glucose is C6H12O6, which is a compound made of carbon, hydrogen, and oxygen.

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