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Chemistry / Chemical Reactions / Chemical changes

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Chemical Changes

Chemical Change:

A chemical change occurs when two or more chemical substances react to produce new substance with a different set of properties. It is permanent which cannot be reversed. Examples:

Reddish – Brown Decomposition on Iron Objects: Iron reacts with atmospheric oxygen in the presence of moisture to form a reddish-brown layer of iron oxide. This layer is called rust and process is called rusting. Oxygen and water are the two essential conditions for rusting of iron. Oiling and painting of iron objects protect their surfaces from coming in contact with moisture and air and prevent rusting.

Browning of Vegetables and Fruit Surfaces: When we exposed the cut surface of a brinjal to the air for some time, the surface has turned brown, due to a chemical reaction between certain compounds present in brinjal and atmospheric oxygen to produce a brown colour pigment “melanin” that cause browning of the surface. Cut vegetables and fruits soaked in water can reduce the level of browning because water restrict the amount of oxygen to come in contact with surface of cut vegetables and fruits.

Reaction Between Vinegar and Baking Soda: Vinegar + Baking soda $rightarrow$ carbon dioxide + water + other substances. To test carbon dioxide gas, Carbon dioxide + lime water(calcium hydroxide) $rightarrow$ calcium carbonate + water.

Reaction Between Copper Sulphate Solution and Iron Filings: Copper sulphate + Iron $rightarrow$ iron sulphate + copper

Characteristics of Chemical Change:

The chemical change is irreversible and permanent.

The composition of a substance changes during a chemical change.

Either heat is absorbed or evolved during a chemical change.

Total mass of the system remains same

Example of chemical change: Rusting of iron, Burning of candle, Digestion of food, Burning of food, Decomposition of water, Curdling of milk, Butter turning rancid, Ripening of fruit, Drying of paint, Change in color of an apple cut into halves, Clotting of blood, Changes in color of brinjal slice, Digestion of food, Acid base neutralization reaction, Photosynthesis, Removing cream from milk.

Difference Between Physical & Chemical Change:

Physical Changes	Chemical Changes
A physical change is temporary	A chemical change is permanent.
A physical change can be reserved.	chemical change is irreversible
No new substances are formed during a physical changes	New substances are formed during a chemical change
No changes in energy take place.	Energy is either absorbed or evolved.
Composition of a substance remains same.	Composition of a substance change during the chemical reaction.

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