Everything about Chemical Change totally explained
A
chemical change is a process in which
reactants are changed into one or more different
products. A chemical change occurs whenever
compounds are formed or decomposed. During this reaction, there's a rearrangement of
atoms that makes or breaks
chemical bonds. This change is usually not reversible, unlike
physical changes, which typically are reversible. In short, chemical change is a change of one substance into another substance (for example a new substance is formed). By contrast, no new substance is formed in a physical change (for example, the melting of ice is a physical change because when ice changes into water, no new substance is formed.)
In a chemical reaction,
bonds are broken and new bonds are formed between different atoms. This breaking and forming of bonds takes place when particles of the original materials collide with one another. Some
exothermic reactions may be hot enough to 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 vapor.
Chemical changes are happening very often. When wood burns it's a chemical change. There are several different types of chemical change. These include
synthesis,
decomposition,
single displacement,
double displacement,
neutralization,
precipitation and
redox.
An elementary example of a chemical change is the
combustion of
methane to produce
carbon dioxide and
water:
»
Other examples of chemical changes are:
- Burning a log of wood.
- Mixing an acid with a base, producing water and a salt.
- Photosynthesis - a process in which carbon dioxide and water are changed into sugars by plants.
- Cracking heavy hydrocarbons to create lighter hydrocarbons (part of the processs of refining oil).
The following can indicate that a chemical change took place, although this evidence isn't conclusive:
Change of colour (for example, silver to reddish-brown when iron rusts).
Change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat.
Change of form (for example, burning paper).
Light, heat, or sound is given off.
Formation of gases, often appearing as bubbles.
Formation of precipitate (insoluble particles).
The decomposition of organic matter (for example, rotting food).Further Information
Get more info on 'Chemical Change'.
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