Elements, Compounds, Mixtures

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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 Oxygen (O), Hydrogen (H), and Carbon (C).

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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. Examples include Water (H2O) and Ammonia (NH3).

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What is a mixture?

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A mixture is a combination of two or more substances that are not chemically bonded. Examples include air and salad.

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What is the difference between a pure substance and a mixture?

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A pure substance consists of only one type of particle (element or compound), while a mixture contains two or more different particles.

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What is a chemical bond?

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A chemical bond is the force that holds atoms together in a compound. There are two main types: ionic and covalent bonds.

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What is the chemical formula for water?

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The chemical formula for water is H2O, indicating it is made of two hydrogen atoms and one oxygen atom.

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What is the chemical formula for ammonia?

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The chemical formula for ammonia is NH3, indicating it is made of one nitrogen atom and three hydrogen atoms.

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What is a solution?

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A solution is a homogeneous mixture where one substance (solute) is dissolved in another (solvent). An example is saltwater.

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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 an example of a compound?

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An example of a compound is Sodium Bicarbonate (NaHCO3), commonly known as baking soda.