Answer : The correct options are, Bubbles (gas formation) and color change.
Explanation :
Chemical change : It is a change where changes occurs in the chemical composition and thus resulting in the formation of new compound or substance. It is an irreversible reaction.
The indication of chemical changes are :
Formation of gas bubbles.
Formation of precipitate.
Change in color.
Change in temperature.
Change in volume.
Change in smell or taste.
Evolution of heat, light and sound.
Physical change : It is a change in which shape and size of a substance changes. In this there is no change in the chemical composition of the substance and no new substance is forming. It is a reversible reaction.
The indication of chemical changes are :
Change in shape.
Change in form.
Change in size.
Change in phase.
(1) Evaporating : It is a physical change because only changes takes place in the phase from liquid phase to vapor phase.
(2) Bubbles (gas formation) : It is an indicator of chemical change.
(3) Color change : It is an indicator of physical change.
(4) Dissolving : It is a physical change because only changes takes place in the phase from solid phase to liquid phase.
Hence, the correct options are, Bubbles (gas formation) and color change.
