We discussed the difference between physical change and chemical change.
Physical changes: pretty much is a change that changes its physical properties such as color, size, shape, etc. A physical change does not produce a new substance.
Ex. Ice melting, crushing a can, evaporation
Chemical changes: a change that occurs at a molecular level and produces a new substance. Usually a physical change is reversible while a chemical change usually is not. Also this process causes a rearrangement of atoms.
Ex. Burning something, cooking a egg, rusting
After going over the homework we had a code red drill so sadly I had to sit in a corner and fold origami!
YS (3)
We also discussed in class that EVAPORATION is a PHYSICAL CHANGE because changes of state of matter is physical. The water particle's composition isn't being changed in any way, just the speed in which it is moving.
ReplyDeleteYZ
COOKING AN EGG is a CHEMICAL CHANGE. We knew that eggs would become all blackened and crispy if we burned it too long. All that black stuff is carbon. He told us all living stuff is made of carbon, and that is where expressions like carbon footprint comes from. (Right?)
ReplyDeleteYZ
I think that should be right. Would freezing water be physical and what would other chemical changes be? I know this is a past unit but I'm trying to think of some examples right now and I can't.
ReplyDeleteDB
Freezing water is a physical change. Other chemical changes would be rusting, burning, and photosynthesis.
ReplyDeleteJM