Which of the following is/are the applications of first law of thermodynamics (which is also known as law of conservation of energy)?
Correct answer: C. Both A and B
- A. To study processes at constant volume (∆V = 0) only
- B. To study processes at constant pressure (∆P = 0) only
- C. Both A and B
- D. Neither A nor B
Explanation
To study processes at constant volume (∆V = 0): The first law of thermodynamics is applicable to processes that occur at constant volume. In such cases, it can be used to determine changes in internal energy (∆U) and how heat (Q) and work (W) are related. To study processes at constant pressure (∆P = 0): The first law of thermodynamics is also applicable to processes that occur at constant pressure. In this context, it can be used to analyze changes in enthalpy (∆H), where ∆H = Q (heat) at constant pressure.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Thermochemistry and Energetics of Chemical Reactions
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.
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.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Thermochemistry and Energetics of Chemical Reactions questions
Ionic solid is dissolved in water if:
Internal energy of a system depends on all the factors EXCEPT:
Which of the following factors affect heat of a reaction?
If a chemical change takes place by several different routes, the overall energy change is the same, regardless of the route by which the chemical change occurs provided the initial and final conditions are the same. This is in accordance to:
According to Born Haber's cycle, ∆Hlatt of ionic compound is determined by the formula:
A macroscopic property of a system which has some definite values for initial and final states, and which is independent of the path adopted to bring about a change is called: