Question

1) Explain physical and chemical changes are useful in day to day life

Answer 1

Physical changesare the changes that change the physical traits of the substancewithout making any change in their internal structure. Example : Melting of ice cubes. On the other hand, achemical changeis one that affects the internal structure of the substanceso as to form a new substance. Examlpes : Burning of wood. they are all happening around us at every moment like you breathing, the inhalation and exhalation due to which your lungs enlarge and come back to original shape is physical change and that which happens between these 2 (transportation of Oxygen and conversion of it into CO2)is a chemical change.