Question

why are chemical and physical changes important​

Answer 1

because without them we can't produce any type of substances as for producing new products physical or chemical change is necessary. even we can't eat without chemical and physical changes.

Answer 2

Chemical And Physical Changes Are Important Because:-

• Cooking of food:- It is a chemical change because cooking changes the taste, odour and composition of the food.

• Fermentation:- Fermentation is a change that takes place mostly in drinks, fruits and vegetables. The process of fermentation changes the substances of the matter As a result, the form, taste, smell and composition of the matter are changed. Hence, fermentation is a chemical change.

• Digestion of food:- Digestion of food in our body is a chemical change. The food we eat goes into the stomach, where it is churned and converted into a liquid form. The digested food in liquid form is absorbed into the blood.

• Boiling, evaporation and condensation:- All these terms are physical changes. On heating, the liquid changes into its vapour state at a definite temperature of boiling. On cooling at a fixed temperature, the vapour is converted to a liquid state called condensation. The conversion of a liquid into its vapour at a temperature below its boiling point is called evaporation.

• Grinding of substances:- When we grind substances such as wheat, rice, jawar, bajra, etc no new substance is formed, but the grains break down into fine particles. Therefore, the grinding of substances is a physical change.

• Melting of butter in a dish:- When butter is melted in a dish, it only changes its shape and size, but remains the same. No new substance is made. Therefore, it is a physical change.

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