Classification of matter/ Lab tools

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

Water is an example of a compound.

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Example: Breaking a cracker into pieces.

A chemical change is a change that results in the formation of new chemical substances. Example: Rust forming on iron.

The melting point is the temperature at which a solid becomes a liquid. It is a physical property.

A physical property is a characteristic of a substance that can be observed or measured without changing its chemical identity. Example: Water freezes at 0 degrees Celsius.

A heterogeneous mixture is a mixture in which the components are not uniformly distributed and can be easily distinguished. Example: Sand and water.

A homogeneous mixture is a mixture in which the components are uniformly distributed and cannot be easily distinguished. Example: Soluble coffee in water.

A physical change does not alter the chemical composition of a substance, while a chemical change results in the formation of new substances.

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Example: Copper and iron are elements.