Từ C2H2 hãy viết phương trình phản ứng điều chế acetophenone, cloroacetophenon, bromoacetophenon

Which of the following did you identify correctly

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.