8.6 A Check #1

What is the smallest unit of an element that retains the properties of that element?

• Molecule

• Atom

• Compound

• Mixture

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TEKS.SCI.8.6A

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

• Salad

• Saltwater

• Sand and iron filings

• Oil and water

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TEKS.SCI.8.6A

Classify the following as an element, compound, homogeneous mixture, or heterogeneous mixture: Air.

• Element

• Compound

• Homogeneous mixture

• Heterogeneous mixture

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TEKS.SCI.8.6A

Explain why water (H₂O) is considered a compound.

• It is made of two different elements chemically combined.

• It is a single element.

• It is a mixture of gases.

• It is a homogeneous mixture.

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TEKS.SCI.8.6A

Which of the following best describes a heterogeneous mixture?

• A mixture with a uniform composition throughout.

• A mixture where the components are visibly distinct.

• A pure substance with a fixed composition.

• A compound with a chemical formula.

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TEKS.SCI.8.6A

If you have a mixture of iron filings and sulfur, how can you separate the iron filings from the sulfur?

• By using a magnet

• By dissolving in water

• By heating the mixture

• By filtering

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Describe the process of how you would determine if a mixture is homogeneous or heterogeneous.

• Observe the mixture to see if the components are visibly distinct.

• Measure the density of the mixture.

• Check if the mixture can be separated by filtration.

• Determine if the mixture can conduct electricity.

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Why is it important to classify matter into elements, compounds, and mixtures?

• To understand the chemical properties and reactions.

• To determine the color of the substance.

• To measure the weight of the substance.

• To find the temperature at which it melts.

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Which of the following statements is true about compounds?

• Compounds can be separated into their elements by physical means.

• Compounds have properties different from their component elements.

• Compounds are mixtures of two or more elements.

• Compounds are always heterogeneous.

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TEKS.SCI.8.6A

Model how a compound differs from a mixture using an example.

• A compound like water (H₂O) has a fixed ratio of hydrogen to oxygen, while a mixture like air has variable composition.

• A compound like salt (NaCl) can be separated by physical means, while a mixture like sand and salt cannot.

• A compound like carbon dioxide (CO₂) is a single element, while a mixture like sugar water is a combination of elements.

• A compound like gold (Au) is a mixture of metals, while a mixture like brass is a pure substance.

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