Which of the following phase changes requires the addition of thermal energy?* • Condensation
• Vaporization
• Deposition
• Freezing

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Option (b) is the correct answer.

Explanation:

When thermal energy is added to a substance then there will occur an increase in the kinetic energy of molecules. As a result, motion of particles increases due to which a solid substance changes into liquid state and a liquid substance changes into gaseous state.

When a liquid substance gets converted into vapors or gaseous state then this process is called vaporization.

Thus, phase changes that requires the addition of thermal energy is vaporization.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.