Which of the given changes are observed when sugar is heated?
Change in colour
Change in chemical composition
Change in shape
Change in physical state
When granulated sugar is heated, it starts to melt (change in physical state from solid into liquid and change in shape). As it melts its colour start to change from white to golden brown and further to dark brown. Moreover, the chemical composition is also changed because on heating sugar combines with the oxygen present in air to form new compounds.
Curiosity to know more:- The process in which sugar acquires a brownish hue on heating is called caramelization.