They are substances obtained by chemical process.

(a)  

This means a scientific test.

(a)  

This means a pair of glasses to protect your eyes from harmful chemicals.

(a)  

This means "the act of watching to know something."

(a)  

This a person who studies more about sciences.

(a)  

This means "thin spheres of liquid enclosing air."

(a)  

This means "a type coloured substance."

(a)  

This means "adult."

(a)  

This means "materials or things you need."

(a)  

This means "easy to do."

(a)  

This means "to put things in the wrong order."

(a)