Classification of Substances Quiz

What is the primary difference between homogeneous and heterogeneous mixtures?

• Homogeneous mixtures have uniform composition; heterogeneous mixtures do not.

• Heterogeneous mixtures have uniform composition; homogeneous mixtures do not.

• Heterogeneous mixtures contain only one element; homogeneous mixtures contain multiple elements.

• Homogeneous mixtures contain only one element; heterogeneous mixtures contain multiple elements.

When classifying substances, what is a key step to take if you are unsure about a substance's classification?

• Ask a friend.

• Look it up on Wikipedia.

• Consult a chemistry textbook.

• Guess based on appearance.

Why is diamond classified as an element?

• It is made of multiple elements bonded together.

• It is a mixture of different compounds.

• It is a pure form of carbon arranged in a crystal structure.

• It contains impurities that make it a mixture.

What is the molecular formula of glucose?

• C6H12O6

• H2O

• O2

• CO2

How is oxygen found in the air classified?

• As a molecule, specifically O2.

• As a mixture of different gases.

• As a compound with carbon.

• As a single element.

What makes gasoline a homogeneous mixture?

• It is a solid form of carbon.

• It is composed of a single element.

• It contains multiple compounds but looks uniform throughout.

• It is a mixture of gases.

Why is soil generally considered a heterogeneous mixture?

• It is composed of a single element.

• It looks the same throughout.

• It is a liquid mixture.

• It contains various components like rocks and minerals that are visibly different.

What is the primary composition of air in your room?

• A single element.

• A mixture of gases like nitrogen and oxygen.

• A compound of carbon and hydrogen.

• A solid form of carbon.

Which of the following is a characteristic of a homogeneous mixture?

• It is composed of multiple visible components.

• It has a uniform appearance throughout.

• It contains only one type of molecule.

• It is always a solid.

What is a common method to determine if a substance is an element, molecule, or mixture?

• Checking if it is flammable.

• Looking for a molecular formula or list of components.

• Observing its color.

• Measuring its temperature.