Chemical changes

Thechemical changes They are those modifications that substances undergo and that turn them into different ones. This is because it undergoes a modification in its nature.

Chemical changes are then differentiated from Physical changes since in the latter there is no transformation in nature, but simply there is a change of state, volume or shape.

As for example, when you put water in a hole and it boils, it goes from state liquid to gaseous. But it is a reversible change, that is, the water vapor can return to being liquid.

Chemical changes then are notreversiblewhile physicists are. In addition, they occur both molecularly and macroscopically.

• See also: Examples of Chemical Phenomena
  

Some chemical changes are listed below, as an example:

• When we burn logs to make a fire, a chemical change occurs. This is because the wood in the logs turns to ash and, in turn, releases some gases, such as carbon dioxide.
• The production of water, as a consequence of the combination of two hydrogen molecules and one of oxygen is another clear example of the so-called chemical changes.
• The transformation of starch into different types of sugar, when they come into contact with saliva, at the moment in which we digest it, is a chemical change.
• When we combine sodium with chlorine and they react, as a consequence common salt is obtained, also called sodium chloride. And this is just another chemical change.
• The digestion of food is another clear example of chemical change, since what we eat is then transformed into the energy we need to live and carry out different activities, from the basic ones such as walking and breathing, to the more complex ones, such as think and work.
• Photosynthesis, the process that plants carry out, is another example of chemical change since in this process solar energy becomes their power source.
• When atoms are transformed into ions, it is also observed that a chemical change has occurred, since they cannot return to their previous state.
• Diesel is also the consequence of a chemical change, since it is the result of the refining processes that oil undergoes.
• When we put a piece of paper in a flame of fire and it burns and turns to ash, there is also a chemical change.
• Cooking a cake mix is ​​one more example of chemical change, since it, once cooked, can no longer return to its previous state.
• The burning of gunpowder, when we light a firework or when we shoot a gun, is another chemical change.
• When we forget the fruits outside the refrigerator for several days, here we can also observe a chemical phenomenon, since the bacteria begin to act on them, until they oxidize.
• Helium, which is the consequence of nuclear fission that transforms hydrogen, is another case of chemical transformation.
• The transformation of wine into vinegar is also located within the chemical changes. And this occurs when bacteria begin to act and transform ethyl alcohol into what is known as acetic acid.
• Cooking a piece of pork on a griddle is a chemical change.
• Ammonia, which is produced from mixing nitrogen and hydrogen, is another example of a chemical change.
• When grape juice turns into wine, a chemical change is also observed. This is because the grape is fermented, which implies a change in the sugar that the fruits contain.
• When we breathe we also star in a chemical change since the oxygen that we inhale then turns into carbon dioxide that we exhale.
• The combustion of the gasoline of a motorcycle, when it is running, also produces a chemical change.
• When we prepare a fried egg, we are also facing a chemical change.