Review 1: Elements, Compounds & Mixtures

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What is an element?

Back

An element is a pure substance that consists of only one type of atom and cannot be broken down into simpler substances.

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What is a compound?

Back

A compound is a substance formed when two or more different types of atoms bond together in a fixed ratio.

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What is a mixture?

Back

A mixture is a combination of two or more substances where each retains its own properties and can be separated by physical means.

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What is the difference between an element and a compound?

Back

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

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What is a molecule?

Back

A molecule is the smallest unit of a chemical compound that retains the chemical properties of that compound, formed by two or more atoms bonded together.

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What is the periodic table?

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The periodic table is a tabular arrangement of all known chemical elements, organized by increasing atomic number and grouped by similar properties.

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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 a uniform composition and properties throughout.

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What is an example of a mixture?

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

Front

What is the chemical formula for sodium bicarbonate?

Back

The chemical formula for sodium bicarbonate is NaHCO₃.

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture that has a uniform composition and appearance throughout, such as saltwater.