Understanding Matter and Mixtures

What is a pure substance?

• A material composed of two or more different elements or compounds

• A material with a constant composition and distinct chemical properties

• A mixture of different substances

• A solution of various compounds

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Which of the following is a characteristic of mixtures?

• They have a fixed composition

• They can be separated by physical means

• They are always homogeneous

• They have a chemical formula

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What type of mixture is a solution?

• Heterogeneous

• Homogeneous

• Colloidal

• Suspended

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Which of the following is an example of a heterogeneous mixture?

• Saltwater

• Air

• Sand and water

• Vinegar

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What is a property of a solution?

• It scatters light

• It has a uniform composition throughout

• It can be easily separated by filtration

• It is always colorless

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Which of the following is a pure substance?

• Air

• Water

• Salad

• Soil

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What distinguishes a homogeneous mixture from a heterogeneous mixture?

• Homogeneous mixtures have visible different parts

• Homogeneous mixtures have a uniform composition throughout

• Heterogeneous mixtures cannot be separated

• Heterogeneous mixtures are always liquids

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Which of the following is a pure substance?

• Saltwater

• Carbon dioxide

• Mud

• Air

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What is a characteristic of mixtures?

• They have a chemical formula

• They are chemically bonded

• They can be separated into their components

• They have a fixed boiling point

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Which of the following is a type of homogeneous mixture?

• Suspension

• Solution

• Emulsion

• Colloid

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