Pure Substances and Mixtures

Front

What are pure substances?

Back

Pure substances are materials that are made up of only one type of particle. They can be elements or compounds.

Front

True or False: Elements and compounds are pure substances.

Back

True

Front

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

Back

Atoms

Front

Which of the following is an element: Salt (NaCl), Water (H2O), Oxygen (O), Carbon Dioxide (CO2)?

Back

Oxygen (O)

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded.

Front

Which of the following is NOT a mixture: milk, lemonade, vegetable salad, aluminum?

Back

Aluminum.

Front

What are the two types of mixtures?

Back

Homogeneous and Heterogeneous.

Front

Define homogeneous mixture.

Back

A homogeneous mixture is a mixture that has a uniform composition throughout.

Front

Define heterogeneous mixture.

Back

A heterogeneous mixture is a mixture that consists of visibly different substances or phases.

Front

Give an example of a homogeneous mixture.

Back

Saltwater is an example of a homogeneous mixture.