Chemical change

From Wikipedia, the free encyclopedia

This article (or section) may need to be wikified to meet Wikipedia's quality standards.
Please help improve this article, especially its section layout, and relevant internal links. (help)
This article has been tagged since March 2007.

A chemical change involves the change in a substance through chemical reactions . The chemical reactants form a new product with equal mass. The following is a list of evidence that can indicate that a chemical change took place. Note that this evidence is not conclusive. For example, placing a pot of water on a hot stove element causes a change in temperature and a gas to be released (water vapour) but a chemical change did not take place.

The formation of gas, change in color, (e.g., rusting of iron causes a change in color from silver to reddish-brown) change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat, the change of form (burning paper) the change is difficult to reverse, light, heat, or sound is given off, bubbles of gases formed, or the formation of precipitate(chunks) are all characteristics of chemical changes.

Retrieved from "http://en.wikipedia.org../../../c/h/e/Chemical_change.html"