{
  "id": "617702a6-4a53-5833-95a5-073c092d7554",
  "slug": "r2-3-how-far-the-extent-of-chemical-change-sl",
  "title": "R2.3 How far? The extent of chemical change (SL)",
  "course": "IB Chemistry",
  "level": "SL",
  "syllabusCode": "R2.3",
  "questionCount": 15,
  "page": "https://splycr.com/ib-chemistry/r2-3-how-far-the-extent-of-chemical-change-sl",
  "data": "https://splycr.com/library/r2-3-how-far-the-extent-of-chemical-change-sl.json",
  "play": "https://splycr.com/?set=617702a6-4a53-5833-95a5-073c092d7554",
  "section": {
    "name": "Reactivity 2: How much, how fast and how far?",
    "page": "https://splycr.com/ib-chemistry/how-much-how-fast-and-how-far"
  },
  "source": {
    "name": "Biology by Bradford",
    "href": "https://www.biologybybradford.com",
    "note": "Written for the splycr library by Biology by Bradford."
  },
  "questions": [
    {
      "number": 1,
      "question": "State where forward and reverse rates are equal and concentrations are constant?",
      "answer": "Dynamic equilibrium",
      "wrongOptions": [
        "Static equilibrium",
        "Completion",
        "Saturation"
      ]
    },
    {
      "number": 2,
      "question": "Equilibrium can only be established in a…?",
      "answer": "Closed system",
      "wrongOptions": [
        "Open system",
        "Vacuum",
        "Flowing system"
      ]
    },
    {
      "number": 3,
      "question": "At equilibrium, the concentrations of reactants and products are…?",
      "answer": "Constant",
      "wrongOptions": [
        "Equal",
        "Zero",
        "Increasing"
      ]
    },
    {
      "number": 4,
      "question": "Kc expression for N₂ + 3H₂ ⇌ 2NH₃?",
      "answer": "[NH₃]²/[N₂][H₂]³",
      "wrongOptions": [
        "[N₂][H₂]³/[NH₃]²",
        "[NH₃]/[N₂][H₂]",
        "2[NH₃]/3[N₂][H₂]"
      ]
    },
    {
      "number": 5,
      "question": "A value of K much greater than 1 means that at equilibrium…?",
      "answer": "Products predominate",
      "wrongOptions": [
        "Reactants predominate",
        "The reaction is fast",
        "Amounts are equal"
      ]
    },
    {
      "number": 6,
      "question": "A value of Kc = 1 × 10⁻¹⁰ means that at equilibrium…?",
      "answer": "Reactants predominate",
      "wrongOptions": [
        "Products predominate",
        "The reaction is slow",
        "Amounts are equal"
      ]
    },
    {
      "number": 7,
      "question": "A system at equilibrium shifts to oppose any change imposed on it: this is…?",
      "answer": "Le Chatelier's principle",
      "wrongOptions": [
        "Hess's law",
        "Pauli exclusion principle",
        "Aufbau principle"
      ]
    },
    {
      "number": 8,
      "question": "Shift in position when pressure is increased for N₂ + 3H₂ ⇌ 2NH₃?",
      "answer": "To the right",
      "wrongOptions": [
        "To the left",
        "No shift",
        "Right, then left"
      ]
    },
    {
      "number": 9,
      "question": "Effect of adding a catalyst on the position of equilibrium?",
      "answer": "No effect",
      "wrongOptions": [
        "Shifts it right",
        "Shifts it left",
        "Increases K"
      ]
    },
    {
      "number": 10,
      "question": "More H₂ is added to N₂ + 3H₂ ⇌ 2NH₃ at equilibrium. [NH₃] at the new equilibrium?",
      "answer": "Increases",
      "wrongOptions": [
        "Decreases",
        "Unchanged",
        "Halves"
      ]
    },
    {
      "number": 11,
      "question": "For an exothermic forward reaction, raising the temperature makes K…?",
      "answer": "Decrease",
      "wrongOptions": [
        "Increase",
        "Stay the same",
        "Double"
      ]
    },
    {
      "number": 12,
      "question": "Only factor that changes the value of K for a given reaction?",
      "answer": "Temperature",
      "wrongOptions": [
        "Pressure",
        "Concentration",
        "Catalyst"
      ]
    },
    {
      "number": 13,
      "question": "Pressure has no effect on H₂(g) + I₂(g) ⇌ 2HI(g) because each side has…?",
      "answer": "Equal gas amounts",
      "wrongOptions": [
        "A large K",
        "An endothermic reaction",
        "A fast reaction"
      ]
    },
    {
      "number": 14,
      "question": "N₂O₄ (colourless) ⇌ 2NO₂ (brown), ΔH = +57 kJ mol⁻¹. On heating, the mixture turns…?",
      "answer": "Darker brown",
      "wrongOptions": [
        "Paler brown",
        "Colourless",
        "Green"
      ]
    },
    {
      "number": 15,
      "question": "The Haber process uses a moderate temperature as a compromise between yield and…?",
      "answer": "Rate",
      "wrongOptions": [
        "Pressure",
        "Purity",
        "Atom economy"
      ]
    }
  ]
}