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Chalk is calcium carbonate - CaCO3.

Any chemical compound contain some impurities.

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12y ago

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Is chalk a mixture or pure substance?

Chalk is a type of limestone composed primarily of calcium carbonate. In its pure form, chalk is considered a pure substance because it has a uniform and definite chemical composition. However, commercially available chalk may contain impurities or additives, making it a mixture.


Is chalk a substance or mixture?

It's a pure substance because even though the atoms are different they still the same. If that makes sense?


Why is a stick of chalk pure substance and a stick of candy is not?

A stick of chalk is considered a pure substance because it consists mainly of calcium carbonate (CaCO₃) in a uniform composition throughout. In contrast, a stick of candy is not a pure substance because it typically contains a mixture of various ingredients, such as sugars, flavorings, colorings, and sometimes preservatives, resulting in a non-uniform composition. This difference in composition defines the purity of the materials.


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The chalk-like substance is, in fact, chalk.


Why is a stick of chalk a pure substance but a stick of candy not?

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What kind of reaction do you get when you mix chalk and distilled water?

Chalk doesn't react with pure water.


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