Matter Unit Review Test

Madison's lab group is given a dish that contains sand, shells, and water. How should they classify the substance they have been given?

• compound because it contains several elements

• pure substance because it’s made up of various compounds

• heterogeneous mixture because it does not have the same uniform appearance or composition

• homogeneous mixture because it has the same uniform appearance and composition throughout

Examine the models on the left.

Which model represents a pure substance?

• Model 1,

  because it represents compounds.

• Model 2, because it represents several elements.

• Model 3, because it represents one type of compound.

• Model 4, because it contains both elements and compounds.

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Combination of two or more pure substances that are not chemically combined

• compound          
• atom
• mixture 
• element

Water is

• a pure substance
• a mixture

This picture represents which of the following?

• element
• compound
• mixture

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• Solid

• Liquid

• Gas

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What happens when my glass of water is sitting in the sun and disappears into a gas?

• evaporation
• burning
• melting
• freezing

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A gas

• has a definite shape but no definite volume

• has a definite volume but no definite shape

• indefinite shape, indefinite volume

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When the temperature of matter increases the particles...

• speed up and move closer
• speed up and move farther apart
• slow down and move closer together
• slow down and move farther apart

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The molecules in the picture are tightly held together with little movement. They have shape and energy.  Therefore, the picture represents _________.

• solid
• liquid
• gas
• plasma

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