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1 magnesium observation born with the bright white flame and gives a white Residue m g o magnesium oxide interference is a chemical change of white Residue form , oxygen reacts with magnesium secondly in sulphur if it is heated or it will become red hot and will not show any change in it interference is become red hot thirdly if the iron is heated then it will become a dead hard and glow with a bright Shine me its expand if overheated interference is it is not a chemical change its a physical change and only a shape is changed or not changed IV copper is a famous iron because they are both are metal if the copper is heated it will become red hot and no change will be shown accept the shape and size as it expand the interference is its ok and physical change v also same as aluminium as it is also a mental it will become red hot