(Q2) 2. Elements, Compounds, Substances, and Chem Formulas

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What is an element?

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A pure substance that cannot be broken down into simpler substances by chemical means.

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What is a compound?

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A substance formed when two or more different elements are chemically bonded together.

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What is a pure substance?

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A material that has a constant composition and consistent properties throughout.

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What is a mixture?

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A combination of two or more substances that are not chemically bonded and can be separated by physical means.

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What is a chemical formula?

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A way of expressing information about the atoms that constitute a particular chemical compound, using symbols and numbers.

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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 bonded together.

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What is an atom?

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The smallest unit of an element that retains the properties of that element.

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What is a molecule?

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A group of two or more atoms bonded together, which can be of the same or different elements.

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What is a chemical bond?

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The force that holds atoms together in a compound or molecule.

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What is an example of a compound?

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Water (H2O), which consists of two hydrogen atoms and one oxygen atom.