Pure substances & Mixtures 9.1 Practice Test

Front

What is a pure substance?

Back

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

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Define a compound.

Back

A compound is a pure substance made of two or more different elements that are chemically combined in a fixed ratio.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically combined and can be separated by physical means.

Front

Differentiate between homogeneous and heterogeneous mixtures.

Back

Homogeneous mixtures have a uniform composition throughout (e.g., saltwater), while heterogeneous mixtures consist of visibly different substances or phases (e.g., salad).

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What is a homogeneous mixture of elements called?

Back

A homogeneous mixture of elements is called a solution.

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What is a heterogeneous mixture?

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A heterogeneous mixture is a mixture where the components are not uniformly distributed, and different parts can be seen (e.g., a mixture of sand and iron filings).

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What are the two main categories of matter?

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The two main categories of matter are pure substances and mixtures.

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What is an example of a pure substance?

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An example of a pure substance is distilled water, which contains only H2O molecules.

Front

What is the difference between a compound and a mixture?

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A compound is made of two or more elements chemically combined, while a mixture consists of two or more substances that are physically combined.

Front

Can mixtures be separated?

Back

Yes, mixtures can be separated by physical methods such as filtration, distillation, or evaporation.