{
  "id": "da1c7a59-4c92-5356-8cf2-6550e8b15c47",
  "slug": "r1-2-energy-cycles-in-reactions-hl",
  "title": "R1.2 Energy cycles in reactions (HL)",
  "course": "IB Chemistry",
  "level": "HL",
  "syllabusCode": "R1.2",
  "questionCount": 13,
  "page": "https://splycr.com/ib-chemistry/r1-2-energy-cycles-in-reactions-hl",
  "data": "https://splycr.com/library/r1-2-energy-cycles-in-reactions-hl.json",
  "play": "https://splycr.com/?set=da1c7a59-4c92-5356-8cf2-6550e8b15c47",
  "section": {
    "name": "Reactivity 1: What drives chemical reactions?",
    "page": "https://splycr.com/ib-chemistry/what-drives-chemical-reactions"
  },
  "source": {
    "name": "Biology by Bradford",
    "href": "https://www.biologybybradford.com",
    "note": "Written for the splycr library by Biology by Bradford."
  },
  "questions": [
    {
      "number": 1,
      "question": "Enthalpy change making 1 mol of a compound from its elements in their standard states?",
      "answer": "Enthalpy of formation",
      "wrongOptions": [
        "Enthalpy of combustion",
        "Enthalpy of atomisation",
        "Lattice enthalpy"
      ]
    },
    {
      "number": 2,
      "question": "Enthalpy change when 1 mol of a substance burns completely in oxygen?",
      "answer": "Enthalpy of combustion",
      "wrongOptions": [
        "Enthalpy of formation",
        "Enthalpy of atomisation",
        "Enthalpy of neutralisation"
      ]
    },
    {
      "number": 3,
      "question": "ΔHf⦵ of O₂(g)?",
      "answer": "0 kJ mol⁻¹",
      "wrongOptions": [
        "−286 kJ mol⁻¹",
        "+498 kJ mol⁻¹",
        "+249 kJ mol⁻¹"
      ]
    },
    {
      "number": 4,
      "question": "Expression for ΔH⦵ from enthalpies of formation?",
      "answer": "ΣΔHf(products) − ΣΔHf(reactants)",
      "wrongOptions": [
        "ΣΔHf(reactants) − ΣΔHf(products)",
        "ΣΔHf(products) + ΣΔHf(reactants)",
        "ΣΔHf(products) ÷ ΣΔHf(reactants)"
      ]
    },
    {
      "number": 5,
      "question": "Expression for ΔH⦵ from enthalpies of combustion?",
      "answer": "ΣΔHc(reactants) − ΣΔHc(products)",
      "wrongOptions": [
        "ΣΔHc(products) − ΣΔHc(reactants)",
        "ΣΔHc(reactants) + ΣΔHc(products)",
        "ΣΔHc(products) ÷ ΣΔHc(reactants)"
      ]
    },
    {
      "number": 6,
      "question": "ΔHf⦵: C₂H₄ +52, C₂H₆ −84 kJ mol⁻¹. ΔH⦵ for C₂H₄ + H₂ → C₂H₆?",
      "answer": "−136 kJ mol⁻¹",
      "wrongOptions": [
        "+136 kJ mol⁻¹",
        "−32 kJ mol⁻¹",
        "+32 kJ mol⁻¹"
      ]
    },
    {
      "number": 7,
      "question": "Enthalpy change when 1 mol of an ionic solid separates into gaseous ions?",
      "answer": "Lattice enthalpy",
      "wrongOptions": [
        "Enthalpy of atomisation",
        "Ionisation energy",
        "Enthalpy of solution"
      ]
    },
    {
      "number": 8,
      "question": "Sign of lattice enthalpy as the IB defines it?",
      "answer": "Positive",
      "wrongOptions": [
        "Negative",
        "Zero",
        "Either sign"
      ]
    },
    {
      "number": 9,
      "question": "Energy cycle used to find the lattice enthalpy of an ionic compound?",
      "answer": "Born–Haber cycle",
      "wrongOptions": [
        "Carnot cycle",
        "Haber process",
        "Contact process"
      ]
    },
    {
      "number": 10,
      "question": "Enthalpy change for Na(s) → Na(g)?",
      "answer": "Enthalpy of atomisation",
      "wrongOptions": [
        "Enthalpy of vaporisation",
        "Ionisation energy",
        "Lattice enthalpy"
      ]
    },
    {
      "number": 11,
      "question": "Enthalpy of atomisation of chlorine, given Cl–Cl bond enthalpy 242 kJ mol⁻¹?",
      "answer": "+121 kJ mol⁻¹",
      "wrongOptions": [
        "+242 kJ mol⁻¹",
        "+484 kJ mol⁻¹",
        "−121 kJ mol⁻¹"
      ]
    },
    {
      "number": 12,
      "question": "The second electron affinity of oxygen, O⁻(g) + e⁻ → O²⁻(g), is…?",
      "answer": "Endothermic",
      "wrongOptions": [
        "Exothermic",
        "Zero",
        "Thermoneutral"
      ]
    },
    {
      "number": 13,
      "question": "Lattice enthalpy is largest for ions with…?",
      "answer": "Higher charge, smaller radius",
      "wrongOptions": [
        "Lower charge, larger radius",
        "Higher charge, larger radius",
        "Lower charge, smaller radius"
      ]
    }
  ]
}