Classify the following as physical or chemical transformations:?
b. gasoline evaporating from an open can
c. charcoal briquettes turning into powder
b and c are chemical, I think.
could you tell me what a is and why?
Answer:
Eggs being fried is a chemical change, because the composition of the egg is changing. It's not merely turning into a solid egg, with each of the molecules remaining unchanged. The heat applied, in this case, causes a chemical change, much like heating oxygen and hydrogen together to make water.
Gasoline evaporating is a physical change because its changing phases- from a liquid to a gas, which is a physical change... no molecules are being turned into something else. The gasoline-liquid molecule is the same as the gasoline-gas molecule.
Charcoal briquettes turning into powder is another physical change, taking smaller and smaller pieces of charcoal still gives you charcoal, even until you get to the molecule itself.
Chemical changes are those that change the very molecule, for example, CO becoming CO2.
Physical changes are those that do not change the molecule itself, like separating iron from baby powder. The iron is still iron.
I hope that helped.
the easy way to diferentiat is if the change canot be reversed it is usaly a chemical change.
a:chemical.-you cant unfry an egg
b: physical. you can collect the vapor and turn it back into a liquid
c: physical. the powder still has the same properties as a burqette.its just in a smaller form
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