{
  "id": "0fb28d14-8cb0-5179-aa82-2411cd546d29",
  "slug": "r2-2-how-fast-the-rate-of-chemical-change-hl",
  "title": "R2.2 How fast? The rate of chemical change (HL)",
  "course": "IB Chemistry",
  "level": "HL",
  "syllabusCode": "R2.2",
  "questionCount": 15,
  "page": "https://splycr.com/ib-chemistry/r2-2-how-fast-the-rate-of-chemical-change-hl",
  "data": "https://splycr.com/library/r2-2-how-fast-the-rate-of-chemical-change-hl.json",
  "play": "https://splycr.com/?set=0fb28d14-8cb0-5179-aa82-2411cd546d29",
  "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": "Overall order of reaction for rate = k[A]²[B]?",
      "answer": "3",
      "wrongOptions": [
        "2",
        "1",
        "4"
      ]
    },
    {
      "number": 2,
      "question": "Doubling [A] quadruples the rate. Order with respect to A?",
      "answer": "2",
      "wrongOptions": [
        "1",
        "4",
        "0"
      ]
    },
    {
      "number": 3,
      "question": "Doubling [B] leaves the rate unchanged. Order with respect to B?",
      "answer": "0",
      "wrongOptions": [
        "1",
        "2",
        "−1"
      ]
    },
    {
      "number": 4,
      "question": "Units of the rate constant for a first-order reaction?",
      "answer": "s⁻¹",
      "wrongOptions": [
        "mol dm⁻³ s⁻¹",
        "dm³ mol⁻¹ s⁻¹",
        "mol⁻¹ s⁻¹"
      ]
    },
    {
      "number": 5,
      "question": "Units of the rate constant for a second-order reaction?",
      "answer": "dm³ mol⁻¹ s⁻¹",
      "wrongOptions": [
        "mol dm⁻³ s⁻¹",
        "s⁻¹",
        "dm⁶ mol⁻² s⁻¹"
      ]
    },
    {
      "number": 6,
      "question": "The rate constant of a given reaction increases with…?",
      "answer": "Temperature",
      "wrongOptions": [
        "Concentration",
        "Pressure",
        "Volume"
      ]
    },
    {
      "number": 7,
      "question": "Half-life of a first-order reaction is…?",
      "answer": "Independent of concentration",
      "wrongOptions": [
        "Proportional to concentration",
        "Doubling each time",
        "Halving each time"
      ]
    },
    {
      "number": 8,
      "question": "First-order reaction with a 10 s half-life: fraction of reactant left after 30 s?",
      "answer": "1/8",
      "wrongOptions": [
        "1/3",
        "1/6",
        "1/4"
      ]
    },
    {
      "number": 9,
      "question": "Slowest elementary process in a reaction mechanism?",
      "answer": "Rate-determining step",
      "wrongOptions": [
        "Initiation step",
        "Transition state",
        "Termination step"
      ]
    },
    {
      "number": 10,
      "question": "Number of particles that collide in an elementary step?",
      "answer": "Molecularity",
      "wrongOptions": [
        "Order",
        "Stoichiometry",
        "Rate constant"
      ]
    },
    {
      "number": 11,
      "question": "Species formed in one step of a mechanism and used up in a later step?",
      "answer": "Intermediate",
      "wrongOptions": [
        "Catalyst",
        "Transition state",
        "Product"
      ]
    },
    {
      "number": 12,
      "question": "For NO₂ + CO → NO + CO₂, rate = k[NO₂]². Reactants in the slow step?",
      "answer": "2NO₂",
      "wrongOptions": [
        "NO₂ + CO",
        "NO₂",
        "2CO"
      ]
    },
    {
      "number": 13,
      "question": "The Arrhenius equation?",
      "answer": "k = Ae^(−Eₐ/RT)",
      "wrongOptions": [
        "k = Ae^(Eₐ/RT)",
        "k = Ae^(−RT/Eₐ)",
        "k = −Eₐ/RT"
      ]
    },
    {
      "number": 14,
      "question": "Gradient of an Arrhenius plot of ln k against 1/T?",
      "answer": "−Eₐ/R",
      "wrongOptions": [
        "Eₐ/R",
        "−R/Eₐ",
        "ln A"
      ]
    },
    {
      "number": 15,
      "question": "Intercept of an Arrhenius plot of ln k against 1/T?",
      "answer": "ln A",
      "wrongOptions": [
        "−Eₐ/R",
        "A",
        "1/A"
      ]
    }
  ]
}