Pure Substances and Mixtures

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. It can be an element or a compound.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each substance retains its own properties. Mixtures can be homogeneous or heterogeneous.

Front

Define homogeneous mixture.

Back

A homogeneous mixture is a mixture that has a uniform composition and appearance throughout, such as saltwater or coffee.

Front

Define heterogeneous mixture.

Back

A heterogeneous mixture is a mixture that has a non-uniform composition, where the different components can be seen and separated, such as salad or sand.

Front

What are elements?

Back

Elements are pure substances that cannot be broken down into simpler substances by chemical means. They consist of only one type of atom.

Front

What are compounds?

Back

Compounds are pure substances formed when two or more elements chemically combine in fixed proportions. They have different properties than the individual elements.

Front

Give an example of a homogeneous mixture.

Back

An example of a homogeneous mixture is vinegar.

Front

Give an example of a heterogeneous mixture.

Back

An example of a heterogeneous mixture is a fruit salad.

Front

What is the difference between a pure substance and a mixture?

Back

A pure substance has a fixed composition and distinct properties, while a mixture contains two or more substances that retain their individual properties.

Front

True or False: All mixtures are heterogeneous.

Back

False. Mixtures can be either homogeneous or heterogeneous.