The chapter “Thermodynamics” is a very important part of Chemistry in the syllabus of UPSEE examination. About 2-3 questions are always asked from this chapter in the examination.
In this article, engineering aspirants will get complete notes of chapter Thermodynamics including important concepts, formulae and previous years’ solved questions for UPSEE 2018.
Students can read the following topics here:
1. System and Surroundings,
2. Types of system (open, closed, isolated),
3. State variables/functions,
4. Thermodynamic processes (isothermal, adiabatic, isobaric, isochoric),
5. Sign conventions,
6. Extensive and Intensive properties,
7. Enthalpy and Entropy,
8. Gibbs free energy,
9. First law of thermodynamics,
10. Relationship between C_{p} and C_{v},
11. Standard enthalpy of reactions,
12. Enthalpy changes during phase transformations,
13. Properties of enthalpy changes,
14. Hess's law of constant heat summation and
15. Calorimetry
About the notes:
1. These revision notes are based on the latest syllabus of the examination.
2. These notes are prepared by Subject Experts of Chemistry after the detailed analysis of last few years' papers of UPSEE.
3. With the help of these notes aspirants will get complete overview of the chapter Thermodynamics.
4. These notes contain the crux of the chapter Thermodynamics.
UPSEE/UPTU Chemistry Syllabus: 2017 - 2018
Important Concepts:
The System and the Surroundings
The Universe = The system + The surroundings
Types of the System
Mathematically, ΔE ≠ 0 and Δm ≠ 0
Mathematically, ΔE ≠ 0 and Δm = 0
Mathematically, ΔE = 0 and Δm = 0
State variables / State functions: The functions whose values depend only on the state of the system and not on how it is reached are called state functions.
Thermodynamics Processes:
Mathematically, ΔT = 0
Mathematically, q = 0
Mathematically, Δp = 0
Mathematically, ΔV = 0
Sign Conventions
For ex: heat given to system or work done on system is taken as positive
For ex: heat given out by the system or work done by system is taken negative
Extensive and Intensive Properties
Example: temperature, density, pressure
Example: mass, total volume
Standard enthalpy of reactions: It is the enthalpy change for a reaction when all the participating substances are in their standard states.
Enthalpy changes during phase transformations:
Properties of Enthalpy Change:
UPSEE: Important Questions and Preparation Tips – Solutions
Some previous years' solved questions are given below:
Question 1:
Solution 1:
The criterion for spontaneity of any process the change in entropy is (ΔS_{system} + ΔS_{surrounding ) > 0}
Hence, the correct option is (D).
Question 2:
Solution 2:
Hence, the correct option is (c).
Question 3:
Solution 3:
Hence, the correct option is (c).
Question 4:
Solution 4:
Hence, the correct option is (a).
Question 5:
Solution 5:
Hence, the correct option is (b).
Conclusion:
These notes will help students to save their precious time while preparing for the examination. Some previous years’ solved questions are also given here to make students understand the concepts very clearly. The content given in these notes is presented in a very systematic manner which will help students to grasp all the concepts very easily and quickly.
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