Suppose you have a balloon of given volume, V1, containing a gas at Temperature, T1. When you place the balloon in a colder room at temperature, T2, the balloon's temperature starts to drop. What are the signs of the system's q, w,and E for this process?
Correct answer: C. +q, -w, - E
- A. +q, +w, +E
- B. -q, -w, +E
- C. +q, -w, - E
- D. -q, +w, -E
Explanation
In thermodynamics, the standard sign convention is that energy added to a system in the form of heat is treated as positive, and energy added to a system in the form of work is taken as negative - HIP to WIN (heat in positive - work in negative).Since energy is lost is represented as negative therefore option c correctly explains the system.
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
All of the following are state functions except
In this question, a statement is given followed by two courses of action numbered I and II. It is required to grasp the statement, analyze the problem or policy it mentions and then decide which of the courses of action logically follow / most appropriate.Statement:The local government has agreed to provide necessary infrastructural facilities to the proposed ABC trust's project of supply of clean water to city 'P'.Courses of action:I) The local government should provide necessary land to the trust by completing due formalitiesII) The local government should facilitate obtaining electricity and other permissions to the trust.
In the following question, two statements numbered I and II are given. There may be cause and effect relationship between the two statements. These two statements may be the effect of the same cause or independent causes. These statements may be independent causes without saving any relationship. Read both the statements in question and mark your answer as:A. If statement I is the cause and statement II is its effect;B. If statement II is the cause and statement, I is its effect;C. If both the statements I and II are independent causes;D. If both the statements I and II are effects of independent causes;E. If both the statements I and II are effects of some common causes;I. Majority of Karachi citizens have decided to protest against the construction of government office instead of a park.II. There are no parks in that locality.
The melting of ice at body temperature is an endothermic process:H2O(s) _>H2O(1) ΔΗ= +6.0kJ/mo.Thus eating ice counteracts the exothermic processes of metabolizing food. How much ice (in grams) would you have to eat to counteract the energy gained by eating 28.3g of peanuts (13 kJ/g)?
Ho of which of the following reactions is equal to the standard enthalpy of formation of NH3?
All of the following chemical reactions are endothermic except