Chemical change: Difference between revisions

Revision as of 21:40, 28 November 2006

Revision as of 21:41, 28 November 2006

Line 1:

The ''Italic text'''''Bold text'''<small>Small Text</small><!-- Comment -->

The following is a list of evidence that ''can'' indicate that a chemical change took place. Note that this evidence is not exclusive. 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.

<gallery>

Image:Example.jpg|Caption1

* the formation of [[gas]]

Image:Example.jpg|Caption2

* change in colour (e.g., rusting of iron causes a change in colour from silver to reddish-brown)

</gallery><blockquote>

* change in temperature or energy, such as the production (exothermic) or loss (endothermic) of [[heat]]

Block quote

* production of [[light]], whether visible or invisible

</blockquote>{| class="wikitable"

* the appearance of a new [[substance]]

|-

* a change in amount of a starting [[substance]]

! header 1

* blabla

! header 2

*Examples: baking a cake, a rusty nail, fireworks, vitamins changing color in sunlight, a candle burning, an egg being fried, etc.

! header 3

|-

| row 1, cell 1

| row 1, cell 2

| row 1, cell 3

|-

| row 2, cell 1

| row 2, cell 2

| row 2, cell 3

The|}<br />^{Superscript text}following is a list of evidence that ''can'' indicate that a chemical change took place. Note that this evidence is not exclusive. 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.

--[[User:69.249.71.90|69.249.71.90]] 21:41, 28 November 2006 (UTC)

* [[[[[

== [[Image:FUCK]] ==

]]]]]

When new substances are formed, a chemical change has occurred, and a [[chemical reaction]] has taken place. Note that, in a few cases, exothermic reactions may be hot enough cause certain chemicals to also undergo a change in state; for example in the case of aqueous solutions, bubbles may not necessarily be newly produced gas but instead water vapour.