Free Internal Energy MCQs with Answers
11 Internal Energy MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Internal energy is the total microscopic kinetic and potential energy of a system and is a state function. The first law, ΔU = q + w, connects changes in internal energy with heat and work, including sign conventions, expansion or compression and constant-volume processes.
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11 questions
- A. heat supplied to the system only
- B. work done by the system only
- C. total of all kinetic and potential energies of the particles in the system
- D. energy lost to the surroundings
Explanation: Internal energy sums the translational, rotational and vibrational energy of the particles together with the potential energy stored in…
Correct answer: total of all kinetic and potential energies of the particles in the system- A. enthalpy, since the pressure is constant
- B. internal energy, since the volume is constant
- C. entropy
- D. free energy
Explanation: A bomb calorimeter is a sealed rigid vessel, so the volume cannot change, no expansion work is done and all the energy released appears as…
Correct answer: internal energy, since the volume is constant3. The second nuclear weapons used in warfare over Nagasaki, Japan, contain energy equal about of TNT?
- A. 1.5 kilotons
- B. 20 kilotons
- C. 25 kilotons
- D. 30 kilotons
Explanation: The Nagasaki plutonium bomb, Fat Man, had an estimated explosive yield of about 21 kilotons of TNT, which is conventionally rounded to…
Correct answer: 20 kilotons- A. Change in state of the system is increased
- B. Temperature of the ystem may rise
- C. Chemical reaction may take place
- D. All
Explanation: An increase in internal energy can appear as a temperature rise, a change of physical state, or energy that enables a chemical reaction…
Correct answer: All- A. 1238.78 J mol−1
- B. −2477.57 J mol−1
- C. 2477.57 J mol−1
- D. −1238.78 J mol−1
Explanation: The reaction is C(s) + ½O₂(g) → CO(g). The relationship is ΔH - ΔU = ΔngRT.
Correct answer: 1238.78 J mol−1- A. Molecular size
- B. Pressure only.
- C. Volume only
- D. Temperature only
Explanation: In an ideal gas, the inter-molecular collisions are assumed to be absent and the collisions are perfectly elastic.
Correct answer: Temperature only- A. 50 kJ
- B. 100 kJ
- C. 150 kJ
- D. 5000 kJ
Explanation: According to the first law of thermodynamics, ΔU = q + w. Heat absorbed is positive (q = +100 kJ), and work done by the system is negative…
Correct answer: 50 kJ- A. Work done
- B. Internal energy change
- C. Enthalpy
- D. Entropy
Explanation: At constant volume, the heat of the reaction is equal to the 'change in the internal energy of the system'.
Correct answer: Internal energy change- 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 matter10. 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 energyInternal Energy MCQs: common questions
Are these Internal Energy MCQs free?
Yes. All Internal Energy MCQs from Chemistry are free on TestUstad, with unlimited attempts and no account needed. Nothing on this page is a sample or a trial.
How many Internal Energy MCQs are on this page?
There are 11 Internal Energy MCQs in the Chemistry bank, shown 20 to a page with the correct answer and an explanation on each.
Does every Internal Energy MCQ have an explanation?
Yes. Each Internal Energy question shows the correct option and a written explanation of why it is correct, so a wrong answer teaches you something rather than just being marked wrong.
Can I take a timed Internal Energy test?
Yes. The practice button on this page starts a free Internal Energy test drawn from the Chemistry bank. It marks each answer instantly, gives you a score at the end, and can be retaken as many times as you like.