C3 - Quantitative Chemistry

    Cards (21)

    • What does the conservation of mass state in a chemical reaction?
      The total mass of all substances is conserved.
    • Why must we balance chemical equations?
      To ensure that the atoms that go in must come out.
    • What is relative formula mass?
      It is the sum of the relative atomic masses of all atoms in a compound.
    • How do you calculate the relative formula mass of CO2?
      By adding 12 and 2 times 16, which equals 44.
    • What happens to the mass of reactants when a gas product leaves the reaction vessel?
      It results in a seeming decrease in mass of the reactants.
    • What is a mole in chemistry?
      A mole is a specific number of atoms or molecules.
    • How is the concept of moles useful in chemistry?
      It allows us to compare amounts of substances.
    • How many grams of a substance equal one mole?
      The mass in grams is equal to its relative atomic or formula mass.
    • What does the stoichiometry of a reaction indicate?
      It indicates the ratio of moles of one substance to another in a reaction.
    • How many grams of water are produced from 64 g of methane reacting completely with oxygen?
      144 g of water is produced.
    • What is the process to convert from mass to moles and back?
      Mass → Moles → Mass using the formula moles = grams / Rams.
    • What is a limiting reactant?
      It is the reactant that runs out first in a reaction.
    • How is concentration of solutions often expressed?
      In grams per decimetre cubed (g/dm³).
    • What does a concentration of 1 mole per decimetre cubed mean?
      It means one mole of solute is dissolved in one decimetre cubed of solution.
    • What is percentage yield in a chemical reaction?
      It tells you how much product is actually made compared to the theoretical amount.
    • How do you calculate percentage yield?
      Percentage yield = (actual yield / theoretical yield) × 100.
    • What is atom economy?
      It tells you how much of a desired product you get out of a reaction compared to the mass of the reactants.
    • How do you calculate atom economy?
      Atom economy = (RAM of desired product / total RAM of reactants) × 100.
    • What is the volume occupied by one mole of any gas at room temperature and pressure (RTP)?
      It occupies a volume of 24 decimetres cubed.
    • How do you convert moles to volume for gases?
      By multiplying or dividing by 24.
    • What are the key concepts related to chemical reactions and stoichiometry?
      • Conservation of mass
      • Balancing equations
      • Relative atomic and formula mass
      • Moles and their calculations
      • Limiting reactants
      • Concentration of solutions
      • Percentage yield
      • Atom economy
      • Volume of gases at RTP
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