Question

91. Write down the characteristis of chemical reactions.​

Answer 1

The characteristics of a chemical reaction are :

Evolution of gas

Formation of a precipitate

Change in color

Change in temperature

Change in state

Formation of new substances

Answer 2

The main Characteristics of chemical reactions are physical properties, shape, size of molecule or atom, color change etc.

Explanation:

• When the atoms or molecules transformed to other form of atom or molecule by changing own color, shape and size then there is Chemical reaction happening.
• There is a huge importance of chemical reactions in industries, daily life and even in our body. For example rusting of iron, mixing salt in water, products which we use are composed of chemical reactions.
• There are many characteristics of chemical reactions which are change in temperature, color, precipitation formation, heat generation, evolution of gases, conservation of mass.