2.4 Mastery Check v2 Compounds and Mixtures

What is a compound?

• A mixture of two or more substances that are not chemically combined

• A pure substance composed of two or more elements that are chemically combined

• A single element in its purest form

• A solution of gases

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DOK Level 1: Recall

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

• Sand and water

• Oil and water

• Salt dissolved in water

• Salad

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DOK Level 1: Recall

Identify a characteristic of heterogeneous mixtures.

• They have a uniform composition throughout

• They consist of a single phase

• The components can be easily separated by physical means

• They are always in the gaseous state

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DOK Level 1: Recall

Which property is common to all pure substances?

• They can be separated into simpler substances by physical means

• They have a fixed composition

• They are always mixtures

• They change composition when mixed with other substances

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DOK Level 1: Recall

Explain why saltwater is considered a homogeneous mixture.

• Because it contains only one type of molecule

• Because the salt and water are chemically combined

• Because the salt is evenly distributed throughout the water

• Because it can be separated by filtration

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DOK Level 2: Skill/Concept

Analyze why a compound is considered a pure substance.

• Because it can be separated into its elements by physical means

• Because it has a variable composition

• Because it has a uniform and definite composition

• Because it is a mixture of different elements

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DOK Level 2: Skill/Concept

Evaluate the statement: "All mixtures are heterogeneous." Provide reasoning for your answer.

• True, because mixtures always have visible different parts

• False, because some mixtures have a uniform composition throughout

• True, because mixtures cannot be separated by physical means

• False, because mixtures are always in the liquid state

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DOK Level 3: Strategic Thinking

Predict the outcome of mixing oil and water and explain the reasoning.

• They will form a homogeneous mixture because they are both liquids

• They will form a heterogeneous mixture because oil is less dense and does not mix with water

• They will chemically react to form a new compound

• They will dissolve completely into each other

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DOK Level 3: Strategic Thinking

Glucose (C₆H₁₂O₆) is considered a compound because it is made up of two or more

• molecules

• elements

• gases

• soilds

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NGSS.MS-PS1-1

Carbon dioxide (CO₂) contains how many atoms of oxygen?

• 0
• 1
• 2
• 3

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NGSS.MS-PS1-1