Elements, Compounds, and Mixtures

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What is a mixture?

Back

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

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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 (O), gold (Au), and hydrogen (H).

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together. Examples include water (H2O) and table salt (NaCl).

Front

What is the difference between a homogeneous mixture and a heterogeneous mixture?

Back

A homogeneous mixture has a uniform composition throughout, like lemonade, while a heterogeneous mixture has a non-uniform composition, like salad.

Front

What is an example of a homogeneous mixture?

Back

Lemonade is an example of a homogeneous mixture because it has a uniform composition.

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What is an example of a heterogeneous mixture?

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Sand in a bottle is an example of a heterogeneous mixture because the different components can be seen and separated.

Front

How many elements are in the compound NaHCO₃ (Baking Soda)?

Back

Baking Soda (NaHCO₃) contains three different elements: sodium (Na), hydrogen (H), carbon (C), and oxygen (O).

Front

What is the chemical formula for table salt?

Back

The chemical formula for table salt is NaCl.

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What is the chemical formula for water?

Back

The chemical formula for water is H2O.

Front

What is the definition of a pure substance?

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A pure substance is a material that has a constant composition and properties throughout. It can be an element or a compound.