Multiple Choice
Which state of matter has the greatest average kinetic energy of its particles?
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8. Thermochemistry
Nature of Energy
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When heat is added to atoms, which of the following best describes what happens?
A
The atoms move faster and their kinetic energy increases.
B
The atoms decrease in size and become more compact.
C
The atoms stop moving and reach absolute zero.
D
The atoms lose electrons and become ions.
Verified step by step guidance1
Understand that when heat is added to a substance, energy is transferred to the atoms or molecules, increasing their motion.
Recall that temperature is a measure of the average kinetic energy of particles; adding heat increases this kinetic energy.
Recognize that atoms do not decrease in size or become more compact simply by adding heat; atomic size is not directly affected by temperature in this way.
Know that atoms do not stop moving unless they reach absolute zero, which is the theoretical lowest temperature and cannot be achieved by adding heat.
Understand that losing electrons to become ions requires specific chemical or physical processes (like ionization), not just the addition of heat under normal conditions.
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