Thermodynamics
Uttar Pradesh Board · Class 11 · Chemistry
Flashcards for Thermodynamics — Uttar Pradesh Board Class 11 Chemistry. Quick Q&A cards covering key concepts, definitions, and formulas.
Interactive on Super Tutor
Studying Thermodynamics? Get the full interactive chapter.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for flashcards and more.
1,000+ Class 11 students started this chapter today
What is a thermodynamic system? Define and give an example.
Answer
A thermodynamic system is that part of the universe in which observations are made. The remaining universe constitutes the surroundings. Example: If we study a reaction between substances A and B in a…
Distinguish between open, closed, and isolated systems with examples.
Answer
Open system: Exchange of both matter and energy with surroundings (e.g., reactants in an open beaker). Closed system: Exchange of energy only, no matter exchange (e.g., reactants in a sealed steel con…
What are state functions? Give examples and explain their importance.
Answer
State functions are properties whose values depend only on the state of the system, not on how that state was reached. Examples: Internal energy (U), enthalpy (H), pressure (p), volume (V), temperatur…
State the First Law of Thermodynamics and write its mathematical expression.
Answer
The First Law of Thermodynamics states that energy can neither be created nor destroyed, only converted from one form to another. Mathematical expression: ΔU = q + w, where ΔU is change in internal en…
Derive the expression for pressure-volume work in a reversible process.
Answer
For a reversible process at constant temperature: w = -∫PdV. For an ideal gas, P = nRT/V, so w = -∫(nRT/V)dV = -nRT∫(dV/V) = -nRT ln(Vf/Vi) = -2.303 nRT log(Vf/Vi). The negative sign indicates work do…
Define enthalpy and explain why it is useful for chemical reactions at constant pressure.
Answer
Enthalpy (H) = U + pV. At constant pressure, ΔH = qp (heat absorbed at constant pressure). Since most chemical reactions occur at constant atmospheric pressure, enthalpy change directly measures the h…
What is the relationship between ΔH and ΔU for reactions involving gases?
Answer
ΔH = ΔU + ΔngRT, where Δng = (moles of gaseous products) - (moles of gaseous reactants). For reactions involving only solids and liquids, ΔH ≈ ΔU since volume changes are negligible. For gas reactions…
Define standard enthalpy of formation (ΔfH⊖) and give the condition for elements.
Answer
Standard enthalpy of formation is the enthalpy change when one mole of a compound is formed from its constituent elements in their most stable states at 1 bar pressure and 298 K. By convention, ΔfH⊖ =…
+17 more flashcards available
Practice AllFrequently Asked Questions
What are the important topics in Thermodynamics for Uttar Pradesh Board Class 11 Chemistry?
How to score full marks in Thermodynamics — Uttar Pradesh Board Class 11 Chemistry?
How many flashcards are available for Thermodynamics?
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
More resources for Thermodynamics
Important Questions
Practice with board exam-style questions
Syllabus
What topics to cover
Revision Notes
Key points for last-minute revision
Study Plan
Step-by-step plan to ace this chapter
Formula Sheet
All formulas in one place
Chapter Summary
Understand the chapter at a glance
Practice Quiz
Test yourself with a quick quiz
Concept Maps
See how topics connect visually
For serious students
Get the full Thermodynamics chapter — for free.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan for Uttar Pradesh Board Class 11 Chemistry.