Pure Substances and Mixtures Quiz-8th

Matter can be classified based on its properties. Which statement about pure substances is NOT true?

• A) A pure substance can be broken down into elements and compounds using physical methods.

• B) Each substance has its own unique properties, such as melting point and boiling point.

• C) A pure substance is composed of one type of particle.

• D) Elements and compounds are pure substances.

Matter can be classified based on its composition. Which statement about mixtures is NOT correct?

• Each mixture is composed of a solute and a solvent.

• Substances within a mixture keep their identities and individual properties.

• Magnets, centrifuges, filters, and other materials can be used to separate mixtures.

• Mixtures can be separated by physical changes, although some mixtures are difficult to separate.

The air is composed of 78% nitrogen, 21% oxygen, and 1% other gases. What type of matter is air?

• heterogeneous mixture

• homogeneous mixture

• element

• compound

Matter is classified based on its properties and composition. Which comparison of different types of matter is correct?

• A) All compounds are mixtures, but not all mixtures are compounds.

• B) All compounds are pure substances, but not all pure substances are compounds.

• C) All heterogeneous mixtures are pure substances, but not all pure substances are heterogeneous mixtures.

• D) All homogeneous mixtures are pure substances, but not all pure substances are homogeneous mixtures.

A chemist adds sand to water and shakes the container. What type of matter has the chemist formed?

• compound

• heterogeneous mixture

• homogeneous mixture

• pure substance

A class is making a Venn diagram to compare the characteristics of pure substances and mixtures. Which characteristic should be placed in the Both section of the Venn diagram?

• can be solid, liquid, or gas

• can be heterogeneous or homogeneous

• can be separated using physical methods

• made of one type of element or compound

Most food items are mixtures. Which of the following foods is a heterogeneous mixture?

• Cereal

• Mayonnaise

• Plain chocolate bar

Which of the following is made up of at least two substances that are not evenly combined?

• Mayonnaise

• Plain chocolate bar

• Tea

• Cereal

A scientist wishes to find out whether a homogeneous liquid sample is a mixture. Which method should the scientist use to try to separate the components of the sample?

• Filtration

• Distillation

• Sedimentation

• Sorting

Concrete is made by adding cement, sand or stones, and water. How should concrete be classified?

• an element

• a compound

• a heterogeneous mixture

• a homogeneous mixture