Elements, Compounds, and Mixtures

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. Examples include elements and compounds.

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What are elements?

Back

Elements are pure substances that cannot be broken down into simpler substances by chemical means. Examples include oxygen (O) and gold (Au).

Front

What are compounds?

Back

Compounds are substances formed when two or more elements are chemically bonded together. An example is water (H2O).

Front

What are mixtures?

Back

Mixtures are combinations of two or more substances that are not chemically bonded. They can be separated by physical means.

Front

Which of the following is an example of an element?

Back

Diamonds (C) and Uranium (U) are examples of elements.

Front

Which of the following is an example of a compound?

Back

Water (H2O) is an example of a compound.

Front

What is the difference between a compound and a mixture?

Back

A compound is formed by the chemical bonding of elements, while a mixture is a physical combination of substances.

Front

What does it mean for a compound to be chemically bonded?

Back

It means that the atoms of the elements in the compound are held together by chemical forces.

Front

Can compounds be separated into their components?

Back

Compounds can only be separated into their components through chemical reactions.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition throughout, such as saltwater.