Matter Changes

Do you ever realize that many things around us is changing? There are so many example of the object surrounding us who are changing. Can you give us an example? The changes that happen to an object is called matter changes. There are two type of matter changes, which is related to their properties. They are Physical & Chemical Changes. What is the different both of them? Let's we discuss it one by one.

Physical Change

Physical changes are concerned with energy and states of matter. Physical changes is a changes that doesn't produce a new substance. In physical change, there is only a change of state. The new substance has the same properties as the old one. For example : ice-water-stem. There are the same, water. No new substance is produced. Sometimes physical changes can be reversed. For example, a cup of water can be frozen when cooled and then can be returned to a liquid form when heated. Physical change may also include changing the shape of the substance. For example : paper cut into a piece is still paper and also cutting wood into a piece is still wood. 

Physical change rearranges molecules but doesn't affect their internal structures. Some examples of physical change are:

• whipping egg whites (air is forced into the fluid, but no new substance is produced)
• magnetizing a compass needle (there is realignment of groups ("domains") of iron atoms, but no real change within the iron atoms themselves).
• boiling water (water molecules are forced away from each other when the liquid changes to vapor, but the molecules are still H₂O.)
• dissolving sugar in water (sugar molecules are dispersed within the water, but the individual sugar molecules are unchanged.) 
• dicing potatoes (cutting usually separates molecules without changing them.) 

Chemical Changes

Chemical change is change that produces a new substance. At the molecular level, chemical change involves making or breaking of bonds between atoms.There are one or more new substance are created. The new substance is different from the original. It has properties that are different than those of starting materials. And also you can't get the material back. chemical changes can't be reversible like in physical changes. In chemical change, there are four characteristics, as follows.

   

1. Gas bubbles are released. (Example: Baking soda and vinegar mix and produce bubbles.)
2. Something changes color. (Example: Leaves turn from green to other colors.)
3. An odor is produced. (Example: Logs burn and smell smoky.)
4. A solid comes out of a solution. (Example: Eggs cook and a white solid comes out of the clear liquid part of the egg.)

These changes are chemical:

• iron rusting (iron oxide forms)
• gasoline burning (water vapor and carbon dioxide form)
• eggs cooking (fluid protein molecules uncoil and cross link to form a network)
• bread rising (yeast converts carbohydrates into carbon dioxide gas)
• milk souring (sour-tasting lactic acid is produced)
• suntanning (vitamin D and melanin is produced) 

  

So, the difference between physical change and chemical change is that while physical change basically involves a change in state of matter and energy, chemical change occurs at the molecular level. Chemical change brings about the creation of a new substance different from the original and is not reversible while in physical change, the substance remains the same though there may be a change in state of matter. Melting of ice is a physical change while resting of iron is a chemical change. 

                                   The Example of Physical Changes

                                       The Example of Chemical Changes


                  


Here are more examples of Physical & Chemical Changes