Chemical Reactions and Equations

How chemical reactions occur? 

How Equations are fromd

How to solve this chapter

Importante question 

Solve activities Balance chemical question 

Types of chemical reactionA nd all problems solve one by oneC ome and learn new things for absolutely free We have learnt in Class IX that during a chemical reaction atoms of one

element do not change into those of another element. Nor do atoms
disappear from the mixture or appear from elsewhere. Actually, chemical
reactions involve the breaking and making of bonds between atoms to
produce new substances. You will study about types of bonds formed between atoms in Chapters 3 and 4.

You must have observed that magnesium ribbon burns with a
dazzling white flame and changes into a white powder. This powder is
magnesium oxide. It is formed due to the reaction between magnesium and oxygen present in the air.

You may perhaps be wondering as to what is actually meant by a
chemical reaction. How do we come to know that a chemical reaction has taken place?