Sublimation is a ___________ change.

The formation of brown powdery material on the surface of iron in the presence of moisture is called _________.

__________ is the process by which a solute gets dissolved in a solvent.

Periodic change may be used for measuring __________.

A change in which only the physical properties of a substance get changed and no new substance is formed is called a __________.

Occurrence of earth quaker is a __________ change.

The changes which repeat themselves at regular intervals of time are called __________ changes.

Burning of fuel is a _________ change but burning of a house is  ___________ .

_________ is the process in which vapour of a liquid on cooling get converted into the liquid at some fixed temperature.

Some changes are __________ at one time but _________ at another time.