Properties such as shape,size,colour and state of a substance are called its ________ properties.

_________ acts as a natural shield against ultraviolet radiations.

__________ turns lime water milky.

A change in which a substance undergoes a change in its physical properties is called a ________ change.

The process of depositing a layer of zinc on iron is called __________.

A chemical change is also called __________.

The formation of rust on the surface of iron is called __________ of iron. 

__________ burns with a brilliant white light.

Photosynthesis is a _________ change.

Burning of any substance is a _________ change.