Equilibrium & Le Chatelier (every paper)

State the shift, justify with the principle, count gas moles. Exam-style N₂(g) + 3H₂(g) ⇌ 2NH₃(g), ΔH negative What happens if: (a) pressure ↑ (b) temperature ↑ (c) catalyst added? (a) 4 mol gas → 2 mol: shifts right (fewer moles) — more NH₃. (b) Forward is exothermic → heat added pushes ENDOTHERMIC direction → shifts left. (c) No position change; equilibrium reached faster. ✓ Right / left / no shift — each justified by Le Chatelier.

Practice for this standard covers the whole topic — flashcards and quiz.