Spontaneity Of Chemical Reactions — Chapter Summary
NIOS · Class 12 · Chemistry
Summary of Spontaneity Of Chemical Reactions for NIOS Class 12 Chemistry. Part of the NIOS Class 12 Chemistry syllabus.
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Overview
Spontaneity is a fundamental concept in chemistry that helps us understand which chemical reactions can occur naturally without external intervention. While the first law of thermodynamics tells us that energy is conserved during reactions, it doesn't explain why some processes happen on their own w
Key Concepts
A spontaneous process is one
A spontaneous process is one that occurs naturally in a system without any external intervention. Once initiated, it continues on its own. Examples in
Entropy is a thermodynamic property
Entropy is a thermodynamic property that measures the degree of disorder or randomness in a system. The greater the disorder, the higher the entropy.
The second law states that all
The second law states that all spontaneous or natural processes produce an increase in the total entropy of the universe: ΔS_universe = ΔS_system + ΔS
The third law states that
The third law states that the entropy of a pure, perfectly crystalline solid at absolute zero (0 K) is zero (S = 0). This provides a reference point f
For a chemical reaction
For a chemical reaction, the standard entropy change is calculated by subtracting the sum of standard entropies of reactants from the sum of standard
Learning Objectives
- Define and understand the concept of entropy as a measure of disorder in a system
- Distinguish between spontaneous and non-spontaneous processes with real-world examples
- Apply the second law of thermodynamics to predict spontaneous changes
- Calculate entropy changes in chemical reactions using standard entropy values
- Understand the third law of thermodynamics and absolute entropy
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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