Elements, Compounds and Mixtures

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.

A compound is a substance formed when two or more different elements chemically bond together in fixed proportions.

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

A homogeneous mixture is a mixture in which the components are evenly distributed and not easily distinguishable, such as saltwater.

A heterogeneous mixture is a mixture in which the components are not evenly distributed and can be easily distinguished, such as a salad.

An element consists of only one type of atom, while a compound consists of two or more different types of atoms chemically bonded together.

Yes, elements can exist in solid, liquid, or gas states depending on temperature and pressure.

A molecule is the smallest unit of a chemical compound that retains its chemical properties, formed by two or more atoms bonded together.

The law of definite proportions states that a chemical compound always contains the same proportion of elements by mass.

A solution is a homogeneous mixture where one substance (the solute) is dissolved in another (the solvent), such as sugar in water.