Elements, Compounds, and Mixtures Quiz

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

• Molecule

• Atom

• Compound

• Mixture

Which of the following is a compound?

• Helium (He)

Which of the following is a homogeneous mixture?

• Sand and water

• Oil and water

• Salt dissolved in water

• Salad

What is the term for a mixture where the components are not uniformly distributed?

• Homogeneous

• Heterogeneous

• Compound

• Element

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

• Air

• Vinegar

• Salad

• Saltwater

What is the term for a pure substance made of two or more elements chemically combined?

• Mixture

• Element

• Compound

• Solution

Which of the following is a characteristic of a compound?

• It can be separated by physical means.

• It has a fixed composition.

• It is a mixture of elements.

• It is always a gas.

What is the term for a mixture where the components are uniformly distributed?

• Heterogeneous

• Homogeneous

• Compound

• Element

Which of the following is an element?

• Sodium chloride (NaCl)

• Gold (Au)

What is the term for a substance that cannot be broken down into simpler substances by chemical means?

• Mixture

• Compound

• Element

• Solution