The law of conservation of energy is actually?
Correct answer: C. First law of thermodynamics
- A. Second law of thermodynamics
- B. Third law of thermodynamics
- C. First law of thermodynamics
- D. Zeroth law of thermodynamics
Explanation
The law of conservation of energy states that the energy is always conserved in a closed system. The first law of thermodynamics is that change in internal energy = heat energy supplied to the system + work done on the system. Hence in both cases, the total energy is conserved.
Last updated
About First Law of Thermodynamics
The first law states that energy is conserved, so the change in a system's internal energy equals heat supplied plus work done on the system, ΔU = q + w. Questions use sign conventions, expansion and compression work, state functions versus path functions, and the relation between internal energy and enthalpy.
Practise Thermochemistry and Energetics of Chemical Reactions
728 free Thermochemistry and Energetics of Chemical Reactions MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
According to the first law of thermodynamics, ΔU = Q + W, where ΔU Is the increase in internal energy of the system, Q is the heat transferred to the system and W is the external work done on the system.Which of the following is NOT a correct expression?
Choose the correct statement.
First law of thermodynamics is expressed as:
If 100 kJ of heat is absorbed by the system and 40 kJ of work is done on the system, what is the change of internal energy?
If 42J heat is transferred to the system during expansion, what is the change in internal energy when work done is 32J?