AP Chemistry : Composition of mixtures

Study concepts, example questions & explanations for AP Chemistry

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Example Questions

Example Question #1 : Composition Of Mixtures

Which of the following mixtures is not a homogeneous mixture:

Possible Answers:

Oil and vinegar

Tea

Wine

A table salt solution

Coffee

Correct answer:

Oil and vinegar

Explanation:

A homogeneous mixture is a uniform mixture of two or more components that appears uniform throughout.  The oil and vinegar mixture would not appear uniform, and thus is a heterogeneous mixture.

Example Question #2 : Composition Of Mixtures

Which of the following is a heterogeneous mixture.

Possible Answers:

All of the above

Gasoline

Motor oil

Oatmeal chocolate chip cookie

Orange juice with no pulp

Correct answer:

Oatmeal chocolate chip cookie

Explanation:

A heterogeneous mixture is a mixture of two or more components that do not appears uniform throughout.  The oatmeal chocolate chip cookie mixture would not appear uniform, and thus is a heterogeneous mixture.

Example Question #1 : Atomic Structure And Properties

Which of the following are mixtures

Possible Answers:

Distilled water

Top soil

Reeses Peanut butter cup

b and c

All of the above

Correct answer:

b and c

Explanation:

A mixture contains two or more different substances.  Distilled water only contains liquid water, and is not a mixture.

Example Question #4 : Composition Of Mixtures

What differentiates a homogeneous mixture from a pure substance?

Possible Answers:

A homogeneous mixture is uniform throughout.

A pure substance can be separated into elements by physical means.

The composition of a pure substance is fixed.

A pure substance is always a compound while mixtures can be elements or compounds.

A mixture has a defined composition.

Correct answer:

The composition of a pure substance is fixed.

Explanation:

A heterogeneous mixture is a mixture of two or more components that do not appears uniform throughout.  A pure substance contains only one component that has a fixed composition.

Example Question #5 : Composition Of Mixtures

A slice of watermelon would best be described as?

Possible Answers:

None of the above

A pure compound

A heterogeneous mixture of compounds

A homogeneous mixture of compounds

A heterogeneous mixture of elements and compounds

Correct answer:

A heterogeneous mixture of elements and compounds

Explanation:

A heterogeneous mixture is a mixture of two or more components that do not appears uniform throughout, but contains components that are elemental (single atom type) and compounds (contain two or more different elements).

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