________ protects us from the harmful ultraviolet radiation.

___________ is made by mixing iron with carbon and metals like chromium,nickel and manganese.

__________ burns with a brilliant white light.

_________ is produced when magnesium oxide is mixed with water.

The chemical name of baking soda is __________.

__________ turns lime water milky.

Burning of wood is a _________ change.

A chemical change is also called __________.

A change  in which  composition and  chemical properties of the substance gets changed is called___________. 

_________ acts as a natural shield against ultraviolet radiations.