Entropy Practice Questions PDF
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This document contains practice questions on entropy, a concept in chemistry and thermodynamics. The questions involve determining whether reactions result in an increase or decrease in entropy, a measure of disorder. Different states of matter (solid, liquid, gas) and types of reactions are used to illustrate these concepts.
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# ENTROPY Name Entropy is the degree of randomness in a substance. The symbol for change in entropy is ΔS. Solids are very ordered and have low entropy. Liquids and aqueous ions have more entropy because they move about more freely, and gases have an even larger amount of entropy. According to t...
# ENTROPY Name Entropy is the degree of randomness in a substance. The symbol for change in entropy is ΔS. Solids are very ordered and have low entropy. Liquids and aqueous ions have more entropy because they move about more freely, and gases have an even larger amount of entropy. According to the Second Law of Thermodynamics, nature is always proceeding to a state of higher entropy. Determine whether the following reactions show an increase or decrease in entropy. | Reaction | Increase or Decrease | |---|---| | 1. 2KCIO3(s) → 2KCI(s) + 302(g) | Increase | | 2. H2O(l) → H₂O(s) | Decrease | | 3. N₂(g) + 3H2(g) → 2NH3(g) | Decrease | | 4. NaCl(s) → Na+(aq) + Cl-(aq) | Increase | | 5. KCI(s) → KCI(I) | Increase | | 6. CO₂(s) → CO2(g) | Increase | | 7. H+(aq) + C₂H₃O₂(aq) → HC₂H₂O₃(1) | Decrease | | 8. C(s) + O2(g) → CO2(g) | Increase | | 9. H2(g) + Cl2(g) → 2HCI(g) | Decrease | | 10. Ag+(aq) + Cl-(aq) → AgCl(s) | Decrease | | 11. 2N2O(g) → 4NO2(g) + O2(g) | Increase | | 12. 2Al(s) + 312(s) → 2All3(s) | Decrease | | 13. H+(aq) + OH-(aq) → H₂O(1) | Decrease | | 14. 2NO(g) → N₂(g) + O2(g) | Increase | | 15. H₂O(g) → H₂O(1) | Decrease | Chemistry IF8766 77
