Bihar Police Constable Model Paper 5

Concept:

• Reactions can be distinguished on the basis of various parameters.
• One such parameter is the trade of energy between the system and the surrounding.
• A system is everything that is under observation. For example, a reaction.
• Everything that is outside the range of the system, that encircles the system is identified as the surrounding.
• A rigid or permeable wall that separates the system from the surrounding is identified as the boundary.