Physical and Chemical Changes

By Lara Segovia & Logan Saul

Physical changes

Physical changes are changes affecting the way of a chemical substance, but not its chemical structure. Physical changes are used to take apart mixtures into their compounds, but can not usually be used to take apart compounds into chemical elements or simpler compounds.

Chemical changes

Chemical changes happen when a substance mixes with another substance to create a new substance, called synthesis or, alternatively, decomposes into two or more different substances. These processes are called chemical reactions and are not reversible except by further chemical reactions. Some reactions produce heat and others may require heat to turn on to occur, which are called endothermic reactions. Understanding chemical changes is a big part of the science of chemistry.