Elements, Compounds, Mixtures

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include oxygen, hydrogen, and gold.

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What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together. An example is sodium bicarbonate (NaHCO3).

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded. Each substance retains its own properties. An example is a salad.

Front

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 that are not chemically combined.

Front

What is an example of a mixture?

Back

An example of a mixture is air, which contains various gases like oxygen and nitrogen.

Front

What is the chemical formula for water?

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The chemical formula for water is H2O, which indicates it is a compound made of hydrogen and oxygen.

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What does it mean for a substance to be pure?

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A pure substance is made up of only one type of particle and has consistent properties throughout.

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Can a mixture be separated into its components?

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Yes, mixtures can be separated into their individual components by physical means, such as filtration or distillation.

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What is an example of an element?

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An example of an element is oxygen (O), which is essential for respiration.

Front

What is the significance of the periodic table?

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The periodic table organizes all known elements based on their properties and atomic structure.