Elements, Compounds, and Homogeneous and Heterogeneous Mixtures

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together. For example, water (H2O) is a compound made of hydrogen and oxygen.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture in which the composition is uniform throughout. The individual components are not distinguishable. Example: saltwater.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture in which the composition is not uniform and the individual components can be seen and separated. Example: salad.

Front

How many different elements are in ammonia (NH3)?

Back

Ammonia (NH3) contains 2 different elements: nitrogen (N) and hydrogen (H).

Front

What is the smallest unit of a substance that retains its properties?

Back

An atom is the smallest unit of a substance that retains its chemical properties.

Front

Is vinegar a compound or a mixture?

Back

Vinegar is a homogeneous mixture, as it is a solution of acetic acid in water.

Front

Is Kool Aid a homogeneous or heterogeneous mixture?

Back

Kool Aid is a homogeneous mixture because it is a uniform solution of water, sugar, and flavoring.

Front

What is an example of a heterogeneous mixture?

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An example of a heterogeneous mixture is a snow globe, where the water and glitter do not mix uniformly.

Front

What defines 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.