Purpose: Verify SCH3U stoichiometry, equilibrium concept, and acid-base basics before deeper equilibrium work.
Q1 — Stoichiometry
3.0 mol N₂ reacts with excess H₂ via N₂ + 3H₂ → 2NH₃. Theoretical yield of NH₃?
Reveal
6.0 mol NH₃.
Q2 — Concentration
What's the concentration of 0.50 mol HCl in 250 mL water?
Reveal
0.50/0.250 = 2.0 M.
Q3 — Reversibility
What does ⇌ mean? When is a reaction at equilibrium?
Reveal
Two-way (reversible) reaction. Equilibrium when forward rate = reverse rate; concentrations constant.
Q4 — Acid-base (SCH3U)
Define pH. What is the pH range for acidic, neutral, basic solutions?
Reveal
pH = −log[H⁺]. Acidic <7, neutral =7, basic >7.
Q5 — Strong vs weak
Give one example of a strong acid and one weak acid. How do they differ in dissociation?
Reveal
Strong (HCl) — fully dissociates. Weak (CH₃COOH) — partially.
Q6 — Reflection
What was hardest about acid-base in SCH3U? What feels familiar/unfamiliar about equilibrium?
Q7 — pH calc
Find pH of 0.010 M HNO₃.
Reveal
pH = −log(0.010) = 2.0.
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