Free Thermochemistry and Energetics of Chemical Reactions MCQs with Answers
728 Thermochemistry and Energetics of Chemical Reactions MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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728 questions · page 37 of 37
- A. Gaseous matter
- B. Solid matter
- C. Liquid matter
- D. all have the same magnitude
Explanation: Internal energy is defined as the sum of kinetic and potential energies associated with the random motion of atoms in a substance, and…
Correct answer: Gaseous matter722. The sum of all possible kinds of energies of all atoms, molecules or ions within a system is called:
- A. Test
- B. Internal energy
- C. Potential energy
- D. Bond energy
Explanation: Internal energy refers to the total energy of all the atoms, molecules, or ions within a system.
Correct answer: Internal energy- A. internal energy
- B. Work
- C. Enthalpy
- D. All of the above
Explanation: When we talk about the change in heat at constant volume, we are actually measuring the internal energy of the system.
Correct answer: internal energy- A. Corrosion
- B. Sotubility
- C. Melting point
- D. Boiling point
Explanation: A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance.
Correct answer: Corrosion- A. closed system
- B. open system
- C. isolated system
- D. None of the above
Explanation: Thermoflask will not allow the exchange of matter and energy with the surrounding environment.
Correct answer: isolated system- A. Heat capacity
- B. 1 Joule
- C. Specific beat
- D. One calorie
Explanation: The Correct MCQ should be "The amount of heat required to raise the temperature of 1g of substance through 1K is called" Specific heat is…
Correct answer: Specific beat- A. The entropy of the system does not change
- B. The entropy of the system increases
- C. The entropy of the system decreases
- D. The entropy of the system does not decrease
Explanation: Essential conditions for the adiabatic process to take place are: i) System is perfectly insulated from surrounding.
Correct answer: The entropy of the system does not decrease- A. Clausius
- B. Carrot
- C. Pascal
- D. Kelvin
Explanation: Rudolf Clausius, a German physicist, introduced the concept of entropy in the study of thermodynamics.
Correct answer: Clausius