Which of the processes is exothermic?
1.evaporation of alcohol
2.sublimation of iodine
3.solidification of volcanic lava
4. burning of paper

3.solidification of volcanic lava

Explanation: Exothermic reactions are those in which energy is released by the system and endothermic reactions are those in which energy is absorbed by the system.

Evaporation of alcohol requires energy to convert liquid state to gaseous state and thus is endothermic.

Sublimation of iodine requires energy to convert solid state to gaseous state and thus is endothermic.

Solidification of solid lava releases energy as liquid state is being converted to solid state and thus is exothermic.

Burning of paper requires energy and thus is endothermic.

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

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