{
  "id": "3a8b74b1-bc41-58bc-93ae-925317287dcf",
  "slug": "r2-1-how-much-the-amount-of-chemical-change",
  "title": "R2.1 How much? The amount of chemical change",
  "course": "IB Chemistry",
  "level": "SL",
  "syllabusCode": "R2.1",
  "questionCount": 14,
  "page": "https://splycr.com/ib-chemistry/r2-1-how-much-the-amount-of-chemical-change",
  "data": "https://splycr.com/library/r2-1-how-much-the-amount-of-chemical-change.json",
  "play": "https://splycr.com/?set=3a8b74b1-bc41-58bc-93ae-925317287dcf",
  "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": "Coefficients in a balanced equation give the ratio of reacting…?",
      "answer": "Amounts in moles",
      "wrongOptions": [
        "Masses in grams",
        "Densities",
        "Volumes of solids"
      ]
    },
    {
      "number": 2,
      "question": "Coefficient of Al when Al + O₂ → Al₂O₃ is balanced with whole numbers?",
      "answer": "4",
      "wrongOptions": [
        "2",
        "3",
        "1"
      ]
    },
    {
      "number": 3,
      "question": "Amount of H₂O from 0.50 mol of O₂ with excess H₂ (2H₂ + O₂ → 2H₂O)?",
      "answer": "1.0 mol",
      "wrongOptions": [
        "0.50 mol",
        "0.25 mol",
        "2.0 mol"
      ]
    },
    {
      "number": 4,
      "question": "Maximum amount of NH₃ from 3.0 mol of H₂ with excess N₂ (N₂ + 3H₂ → 2NH₃)?",
      "answer": "2.0 mol",
      "wrongOptions": [
        "3.0 mol",
        "6.0 mol",
        "1.0 mol"
      ]
    },
    {
      "number": 5,
      "question": "3 mol H₂ and 2 mol N₂ react (N₂ + 3H₂ → 2NH₃). Which runs out first?",
      "answer": "Hydrogen",
      "wrongOptions": [
        "Nitrogen",
        "Ammonia",
        "Neither"
      ]
    },
    {
      "number": 6,
      "question": "Reactant that is used up first and so sets the amount of product?",
      "answer": "Limiting reactant",
      "wrongOptions": [
        "Excess reactant",
        "Catalyst",
        "Intermediate"
      ]
    },
    {
      "number": 7,
      "question": "Reactant left over when a reaction stops?",
      "answer": "Excess reactant",
      "wrongOptions": [
        "Limiting reactant",
        "Catalyst",
        "By-product"
      ]
    },
    {
      "number": 8,
      "question": "Maximum mass of product calculated from the balanced equation?",
      "answer": "Theoretical yield",
      "wrongOptions": [
        "Actual yield",
        "Percentage yield",
        "Atom economy"
      ]
    },
    {
      "number": 9,
      "question": "Mass of MgO from 0.10 mol of Mg (2Mg + O₂ → 2MgO; Mr of MgO = 40)?",
      "answer": "4.0 g",
      "wrongOptions": [
        "8.0 g",
        "2.0 g",
        "40 g"
      ]
    },
    {
      "number": 10,
      "question": "Percentage yield when 15 g is obtained and 20 g was expected?",
      "answer": "75%",
      "wrongOptions": [
        "133%",
        "25%",
        "15%"
      ]
    },
    {
      "number": 11,
      "question": "Atom economy: desired product Mr = 60, total Mr of all reactants = 100?",
      "answer": "60%",
      "wrongOptions": [
        "40%",
        "167%",
        "6.0%"
      ]
    },
    {
      "number": 12,
      "question": "Atom economy of a reaction whose only product is the desired one?",
      "answer": "100%",
      "wrongOptions": [
        "50%",
        "0%",
        "75%"
      ]
    },
    {
      "number": 13,
      "question": "Volume of O₂ to burn 10 cm³ of CH₄ completely, at the same temperature and pressure?",
      "answer": "20 cm³",
      "wrongOptions": [
        "10 cm³",
        "5 cm³",
        "30 cm³"
      ]
    },
    {
      "number": 14,
      "question": "Volume of 0.10 mol dm⁻³ H₂SO₄ to neutralise 25.0 cm³ of 0.10 mol dm⁻³ NaOH?",
      "answer": "12.5 cm³",
      "wrongOptions": [
        "25.0 cm³",
        "50.0 cm³",
        "6.25 cm³"
      ]
    }
  ]
}