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what is a physical change explain with example what is a chemical change explain with example what is physical change explain with example class 7 what is chemical change explain with example class 6 what is chemical change explain with example class 7 what is chemical change explain with example class 9 what is physical and chemical change explain with example what is a physical change explain with the help of two examples what kind of change is physical change explain with example what are physical and chemical changes explain with example class 9
