Entropy Practice Worksheet + Answer Key
$9
Entropy trips students up because it feels abstract — this worksheet grounds it in something intuitive (a messy bedroom) before moving into the actual chemistry, then builds from conceptual reasoning into real calculations.
✅ Clear definition of entropy, plus a messy-bedroom analogy that makes the "systems drift toward disorder" idea click
✅ The two key questions for predicting entropy change: is the number of moles of gas increasing or decreasing, and is a substance changing phase or dissolving
✅ Part 1: Predicting the Sign of ΔS — 10 reactions where students mark + or − for entropy change, covering phase changes, dissolving, and shifts in gas moles
✅ Part 2: Calculating ΔS — the ΔS = ΣS°products − ΣS°reactants equation, a reference chart of standard molar entropies for 18 common substances, a fully worked example, and 5 practice problems
✅ Generous work space for every problem
✅ Full answer key, including the reasoning behind every Part 1 answer and the full calculation for every Part 2 answer
✅ Instant digital download (PDF)