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Chemistry Class Concepts Quiz

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Questions and Answers

What type of change is described by evaporating alcohol?

Biological change
Environmental change
Chemical change
Physical change (correct)

Which of the following substances is classified as a pure element?

Water ($H_2O$)
Formaldehyde ($CH_2O$)
Air
Helium (He) (correct)

What type of change occurs when gasoline is burned?

Thermal change
Mechanical change
Chemical change (correct)
Physical change

Which of the following best describes distilled water?

<p>A pure substance and a compound (B)</p>

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What classification applies to the air in the room?

<p>Mixture and both element and compound (D)</p>

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Flashcards

Physical change

A change where a substance's chemical composition remains the same, resulting in only a change in its physical state or appearance.

Chemical change

A change where a substance's chemical composition is altered, resulting in the formation of new substances with different properties.

Element

A substance that consists of only one type of atom.

Compound

A substance that consists of two or more different elements chemically combined in a fixed ratio.

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Mixture

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