Unit 2- Classifying Matter

substance that cannot be changed into simpler substances by chemical means

• Mixture

• Heterogeneous

• element

• homogeneous

• compound

describes a mixture with a uniform composition

• Mixture

• Heterogeneous

• element

• homogeneous

• compound

composed of two or more substances chemically combined in a fixed ratio

• Mixture

• Heterogeneous

• element

• homogeneous

• compound

a physical blend of two or more substances

• Mixture

• Heterogeneous

• element

• homogeneous

• compound

not uniform in composition

• Mixture

• Heterogeneous

• element

• homogeneous

• compound

Which of the following does NOT indicate that a chemical change may have taken place?

• precipitate formation

• formation of fractures/ cracks

• gas production

• energy transfer

Which of the following is a homogeneous mixture?

• salt water

• sand and water

• soil

• beef stew

Which of the following indicates that a chemical change has happened during cooking?

• The food darkens.

• Energy is transferred from the stove to a pan.

• Butter melts.

• Bubbles form in boiling water.

Which of the following is a heterogeneous mixture?

• soil

• steel

• air

• salt water

Which of the following processes does NOT involve a change in chemical properties?

• boiling

• cooking

• rusting

• burning