{
  "id": "9862189f-fdf4-5044-8a6d-ed44cc0a08cd",
  "slug": "r2-2-how-fast-the-rate-of-chemical-change-sl",
  "title": "R2.2 How fast? The rate of chemical change (SL)",
  "course": "IB Chemistry",
  "level": "SL",
  "syllabusCode": "R2.2",
  "questionCount": 15,
  "page": "https://splycr.com/ib-chemistry/r2-2-how-fast-the-rate-of-chemical-change-sl",
  "data": "https://splycr.com/library/r2-2-how-fast-the-rate-of-chemical-change-sl.json",
  "play": "https://splycr.com/?set=9862189f-fdf4-5044-8a6d-ed44cc0a08cd",
  "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": "Change in concentration of a reactant or product per unit time?",
      "answer": "Rate of reaction",
      "wrongOptions": [
        "Yield",
        "Equilibrium constant",
        "Activation energy"
      ]
    },
    {
      "number": 2,
      "question": "Units of rate of reaction?",
      "answer": "mol dm⁻³ s⁻¹",
      "wrongOptions": [
        "mol dm⁻³",
        "s mol⁻¹ dm³",
        "dm³ mol⁻¹ s⁻¹"
      ]
    },
    {
      "number": 3,
      "question": "Average rate when [A] falls by 0.020 mol dm⁻³ in 10 s?",
      "answer": "0.0020 mol dm⁻³ s⁻¹",
      "wrongOptions": [
        "0.20 mol dm⁻³ s⁻¹",
        "0.020 mol dm⁻³ s⁻¹",
        "500 mol dm⁻³ s⁻¹"
      ]
    },
    {
      "number": 4,
      "question": "The rate at an instant is the gradient of which line to the concentration–time curve?",
      "answer": "Tangent",
      "wrongOptions": [
        "Normal",
        "Chord",
        "Asymptote"
      ]
    },
    {
      "number": 5,
      "question": "Colliding particles react only with sufficient energy and the correct…?",
      "answer": "Orientation",
      "wrongOptions": [
        "Speed",
        "Mass",
        "Charge"
      ]
    },
    {
      "number": 6,
      "question": "Graph of the spread of kinetic energies among gas particles?",
      "answer": "Maxwell–Boltzmann distribution",
      "wrongOptions": [
        "Normal distribution",
        "Energy profile",
        "Heating curve"
      ]
    },
    {
      "number": 7,
      "question": "The area under a Maxwell–Boltzmann curve represents the…?",
      "answer": "Total number of particles",
      "wrongOptions": [
        "Average kinetic energy",
        "Activation energy",
        "Rate of reaction"
      ]
    },
    {
      "number": 8,
      "question": "Raising the temperature makes the Maxwell–Boltzmann peak…?",
      "answer": "Lower and shift right",
      "wrongOptions": [
        "Higher and shift right",
        "Lower and shift left",
        "Higher and shift left"
      ]
    },
    {
      "number": 9,
      "question": "Main reason a temperature rise greatly increases reaction rate?",
      "answer": "More particles exceed Eₐ",
      "wrongOptions": [
        "Activation energy decreases",
        "Particles get larger",
        "Collisions become gentler"
      ]
    },
    {
      "number": 10,
      "question": "Powdered CaCO₃ reacts faster with acid than lumps because of a larger…?",
      "answer": "Surface area",
      "wrongOptions": [
        "Activation energy",
        "Particle mass",
        "Enthalpy change"
      ]
    },
    {
      "number": 11,
      "question": "Raising the pressure of reacting gases speeds the reaction mainly by increasing…?",
      "answer": "Collision frequency",
      "wrongOptions": [
        "Activation energy",
        "Particle energy",
        "Enthalpy change"
      ]
    },
    {
      "number": 12,
      "question": "A catalyst speeds up a reaction by providing a pathway with lower…?",
      "answer": "Activation energy",
      "wrongOptions": [
        "Enthalpy change",
        "Collision frequency",
        "Temperature"
      ]
    },
    {
      "number": 13,
      "question": "Effect of a catalyst on ΔH of a reaction?",
      "answer": "No change",
      "wrongOptions": [
        "Increases it",
        "Decreases it",
        "Reverses its sign"
      ]
    },
    {
      "number": 14,
      "question": "Rate of Mg + HCl can be followed with a gas syringe by measuring the…?",
      "answer": "Volume of hydrogen",
      "wrongOptions": [
        "Volume of oxygen",
        "Volume of chlorine",
        "Volume of carbon dioxide"
      ]
    },
    {
      "number": 15,
      "question": "Reaction rate slows as a reaction proceeds because…?",
      "answer": "Reactant concentration falls",
      "wrongOptions": [
        "Activation energy rises",
        "The catalyst is used up",
        "Temperature rises"
      ]
    }
  ]
}