Matter Test Review

A pure substance that is composed only of identical atoms is classified as

• A compound

• An element

• A heterogeneous mixture

• A homogeneous mixture

A compound differs from an element in that a compound

• is homogeneous

• has a definite composition

• has a definite melting point

• can be decomposed by a chemical reaction

Which substance can be decomposed by a chemical change?

• Ammonia NH3

• Aluminum Al

• Magnesium Mg

• Manganese Mn

Which statement is an identifying characteristic of a mixture?

• A mixture can consist of a single element

• A mixture can be separated by physical means

• A mixture must have a definite composition by weight

• A mixture must be homogeneous

Which particle diagram represents a mixture of element X and element Z, only?

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Which statement correctly describes a sample of gas confined in a sealed container?

• It has a large degree of freedom of motion, allowing it to retain its shape no matter the container in which it is confined.

• It has a small degree of freedom of motion, allowing it to retain its shape no matter the container in which it is confined.

• It has a large degree of freedom of motion, allowing it to fill any container in which it is confined.

• It has a small degree of freedom of motion, allowing it to fill any container in which it is confined.

The particle diagram below represents four molecules of a substance.

Which answer choice shows the same substance in a different phase?

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The arrangement of particles is most ordered in a sample of

• NaCl (aq)

• NaCl (l)

• NaCl (g)

• NaCl (s)

A large sample of solid calcium sulfate is crushed into smaller pieces for testing. Which two physical properties are the same for both the large sample and one of the smaller pieces?

• Mass and Density

• Mass and Volume

• Solubility and Density

• Solubility and Volume

Which statement describes a chemical property of the element magnesium?

• Magnesium is malleable

• Magnesium conducts electricity

• Magnesium reacts with an acid

• Magnesium has a high boiling point