Cycloalkanes other than cyclohexane have high heats of combustion per ch2 group because of

We can’t you if you only tell us that you have to show us what the answers are

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.