Chemical Reactions

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 pure substance?

Back

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

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together in a fixed ratio. Example: Water (H2O) is a compound made of hydrogen and oxygen.

Front

What is a mixture?

Back

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

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture in which the components are uniformly distributed, and you cannot see the individual parts. Example: Saltwater.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture in which the components are not uniformly distributed, and you can see the different parts. Example: Salad.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition (e.g., melting ice). A chemical change results in the formation of new substances (e.g., rusting iron).

Front

What is the chemical symbol for Iron?

Back

The chemical symbol for Iron is Fe.

Front

What is rust?

Back

Rust is a compound formed when iron reacts with oxygen and moisture, resulting in iron oxide (Fe2O3).

Front

What is the chemical formula for water?

Back

The chemical formula for water is H2O.