Multiple Choice
How much energy is required to convert 50.0 g of water at 100°C to 50.0 g of steam at 100°C? (Given: The enthalpy of vaporization of water at 100°C is 40.7 kJ/mol.)
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8. Thermochemistry
Nature of Energy
Multiple Choice
Which term refers to the energy required to initiate a chemical reaction?
A
Enthalpy
B
Kinetic energy
C
Potential energy
D
Activation energy
Verified step by step guidance1
Understand that the question asks for the term describing the energy needed to start a chemical reaction.
Recall that enthalpy refers to the total heat content of a system, not specifically the energy to start a reaction.
Recognize that kinetic energy is the energy of motion of particles, which is related but not the specific term for initiating reactions.
Know that potential energy is stored energy due to position or arrangement, but it does not specifically describe the energy to start a reaction.
Identify that activation energy is the minimum energy required to overcome the energy barrier and initiate a chemical reaction.
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