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.
Comments
chemical
Dear Cas3y ,
I totally Agree with you about the physical change vs chemical change , because most people consider thing is happening for no reason. I feel like there a lot of physical change in our Enviroment and chemical change that is going on in the air. When people get sick out of nowhere i figured the weather is changing . One sentence that you brought up that caught my attention was when you mention that “ 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.” I find this so right because without chemistry we wouldn’t be able to find out most of the stuff we know about right now , also I learned that our body is made up of Atoms.
I’m learning more about chemistry and how new disease is appearing out of nowhere , also where can we find more antibiotics that will cure the disease. I also agree with you on how you mention physical change and chemical change is two different things. chemical change occurs when there a color change or odor change.
“Physical changes are concerned with energy and states of matter. A physical change does not produce a new substance.”
http://chemistry.about.com/od/lecturenotesl3/a/chemphyschanges.htm
the reason why i choose that sentence from the website is because physical change does not produce any new substance. Another reason why i Agree with you is because when you boil water there is less oxygen in it the if the water was cold.
I thank you for posting your opinion About chemical and physical change because you have a good way of expressing the way you feel about most thing ,...keep it up
Dear Curtisc, Half of what
Dear Curtisc,
Half of what you said to me i didn't even know.. about loosing less oxygen when the waters hot. reminds me of the movie bed time stories when the old man is scared of germs and keeps his lights off cause germs produce more slowly in the dark than in light. CRAZY!