Physical Change Vs Chemical Change
Some people may think that chemistry is either confusing science stuff or what two people have in common, but that's only half true. Chemistry is used for everything we do, even cooking and cleaning. Also it's used for medicine. This plays a major part in our world, without chemistry we wouldn't be able to do 90% of the everyday things that play out in our day. This explains the unexplained and advances what we already know.
People don't realize that even cooking is part of science. There are two kinds of chemistry that come up. The first is Physical Change. Now this is something causing the object to change physically, but this doesn't mean that the object's substances or "properties," in proper words, change. Basically it's just an reaction to what was being done.
For example, what happens to water when heat is applied? It boils, you can see the change. The water is still water nothing about the taste change. That is a physical change.
Another change is chemical change. This is a little tricky one. Baking a cake, would you say physical or chemical change happens here? If you said physical you're wrong. How? It's simple. Physical change and chemical change have different types of reactions. Color changes and odors are some of chemical reactions being done. In this case cake has an odor when its ready that was due to a chemical reaction in the process of baking it.
Physical change reactions are changes you can ALWAYS visibly see. like cutting, tearing, shattering, and gas bubbles. Chemical change reactions are changes you can SOMETIMES visibly see. like rotting, burning, cooking, rusting, and change in color. This doesn't always happen though there are some reactions that cannot be seen. Sometimes things have an odor, other times it makes a sound, or finally you can feel heat coming from your object when the reaction occurs.