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When aqueous solutions of HCl and NaOH are mixed together in a calorimeter, the temperature of the solution increases. The reaction is



endothermic, causing an increase in the kinetic energy of the solute particles.


endothermic, causing an increase in the kinetic energy of the water molecules.


(exothermic, causing an increase in the kinetic energy of the water molecules.)

exothermic, causing an increase in the kinetic energy of the solute particles.

Verified Answer :

This reaction is exothermic because the system (the aqueoud solution) is transferring heat to its surroundings (the calorimeter) so this eliminates two responses. Since the heat is being transferred to the surroundings, the water that's in the calorimeter in this case, it is causing the water molecules to heat up and thus an increase in the kinetic energy of the water molecules since temperature affects kinetic energy

The reaction is exothermic, causing an increase in the kinetic energy of the water molecules.  


• In a calorimeter when the reaction takes place, and there is an increase in temperature recorded in the thermometer, it shows that the reaction is emitting heat to the surrounding, and such kind of reactions is known as exothermic reaction.  

• With the mixing of aqueous solution of HCl and NaOH the temperature of the solution increases, this shows that the kinetic energy of the water molecules increases. As, kinetic energy is directly proportional to the temperature.  

• With increase in temperature, the collision or vibration of molecules increases, thus, there is an increase in the kinetic energy between the molecules.  


Thus, the reaction is exothermic, causing an increase in the kinetic energy of the water molecules.

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