i need a subtopic for physical/ chemical chenges?

Question

im supposed to write a six page paper on physical and chemical changes but describing them and giving examples only takes up one page. i need a subtopic! please help!!

it should be a middle school or hish school level topic

Answer 1

How about ways that we use the physical and chemical changes in our lives?

Wax: match melts the wax in the wick P change, wax burns with oxygen from air C change, reaction gives off heat and light from C change, heat melts more wax P change, wax moves up wick to be burned.

Apple: picked from tree P, bite into P, chew to mix with saliva C, swallow P, digested C, burned in cells for energy C.