Gr 11 Physical Sciences: Ch 6.2 Stoichiometric calculations
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Questions and Answers

What is the purpose of stoichiometric calculations in chemical reactions?

  • To determine the equilibrium constant
  • To determine the rate of reaction
  • To identify the catalyst in the reaction
  • To determine the amounts of reactants and products (correct)

    • Which reactant is completely consumed first in a chemical reaction?

  • Limiting reagent (correct)
  • Product
  • Catalyst
  • Excess reagent

    • What is the excess reagent in a chemical reaction?

  • The product that is formed
  • The reactant that is completely used up
  • The reactant that is not completely used up (correct)
  • The catalyst in the reaction

    • What is the formula for calculating percent yield?

    <p>Percent Yield = (Actual Yield / Theoretical Yield) × 100</p> Signup and view all the answers

    What does a high percent yield indicate in an industrial process?

    <p>A more efficient and cost-effective reaction</p> Signup and view all the answers

    What is the main difference between molecular and empirical formulae?

    <p>Molecular formula shows the actual number of atoms, while empirical formula shows the simplest ratio</p> Signup and view all the answers

    Why is identifying the limiting reagent crucial in stoichiometric calculations?

    <p>To determine the maximum amount of product that can be formed</p> Signup and view all the answers

    What is the significance of theoretical yield in stoichiometric calculations?

    <p>It is the maximum possible amount of product calculated from the balanced equation</p> Signup and view all the answers

    What is the first step in determining empirical and molecular formulae?

    <p>Find the mass</p> Signup and view all the answers

    What is percent purity a measure of?

    <p>The amount of a specific pure compound in an impure sample</p> Signup and view all the answers

    What is the formula for percent purity?

    <p>(Mass of Pure Compound / Mass of Sample) × 100</p> Signup and view all the answers

    What is the purpose of titration?

    <p>To determine the concentration of an unknown solution</p> Signup and view all the answers

    What is the relationship between the reactants in a titration expressed as?

    <p>C_A V_A = C_B V_B / a</p> Signup and view all the answers

    What is the final step in determining empirical and molecular formulae?

    <p>Determine the molecular formula</p> Signup and view all the answers

    What is the purpose of finding the moles of each element in determining empirical and molecular formulae?

    <p>To determine the simplest ratio</p> Signup and view all the answers

    What is the term for the stoichiometric coefficients from the balanced equation in a titration?

    <p>Stoichiometric coefficients</p> Signup and view all the answers

    What is the purpose of finding the mass of each element in determining empirical and molecular formulae?

    <p>To convert the mass of each element to moles</p> Signup and view all the answers

    What is the significance of the simplest ratio in determining empirical and molecular formulae?

    <p>It is used to write the empirical formula</p> Signup and view all the answers

    What is the advantage of using a standard solution of known concentration in titration?

    <p>It allows for the determination of the concentration of the unknown solution</p> Signup and view all the answers

    What is the result of dividing the given molar mass of the compound by the molar mass of the empirical formula?

    <p>The multiplier to find the molecular formula</p> Signup and view all the answers

    What is the purpose of calculating the molar mass of the empirical formula in determining molecular formulae?

    <p>To determine the multiplier to find the molecular formula</p> Signup and view all the answers

    What is the role of the limiting reagent in a chemical reaction?

    <p>It determines the amount of product formed</p> Signup and view all the answers

    What is the requirement for the standard solution used in titration?

    <p>It must have a known concentration</p> Signup and view all the answers

    What is the result of multiplying the subscripts in the empirical formula by the multiplier?

    <p>The molecular formula of the compound</p> Signup and view all the answers

    What is the theoretical yield in a chemical reaction?

    <p>The maximum possible amount of product calculated from the balanced equation</p> Signup and view all the answers

    What is the relationship between the mass of the pure compound and the mass of the sample in calculating percent purity?

    <p>The mass of the pure compound is less than the mass of the sample</p> Signup and view all the answers

    What is the purpose of calculating percent yield in a chemical reaction?

    <p>To compare the actual yield to the theoretical yield</p> Signup and view all the answers

    What is the empirical formula of a compound?

    <p>The simplest whole-number ratio of atoms in a compound</p> Signup and view all the answers

    What is the significance of identifying the limiting reagent in stoichiometric calculations?

    <p>It determines the amount of product formed</p> Signup and view all the answers

    What is the relationship between the molecular and empirical formulae of a compound?

    <p>The molecular formula gives the actual number of atoms, while the empirical formula gives the simplest ratio</p> Signup and view all the answers

    What is the effect of a high percent yield on an industrial process?

    <p>It reduces waste and the consumption of expensive reagents</p> Signup and view all the answers

    What is the purpose of comparing the mole ratios of the reactants to the ratios given by the balanced equation?

    <p>To identify the limiting reagent</p> Signup and view all the answers

    What is the purpose of finding the simplest ratio in determining empirical and molecular formulae?

    <p>To write the empirical formula</p> Signup and view all the answers

    What is the result of dividing the moles of each element by the smallest number of moles obtained?

    <p>The simplest ratio of the elements</p> Signup and view all the answers

    What is the significance of the multiplier in determining molecular formulae?

    <p>It is used to multiply the subscripts in the empirical formula</p> Signup and view all the answers

    What is the purpose of calculating the molar mass of the empirical formula in determining molecular formulae?

    <p>To find the multiplier</p> Signup and view all the answers

    What is the relationship between the volumes of solutions A and B in a titration?

    <p>The volumes of solutions A and B are related by the stoichiometric coefficients</p> Signup and view all the answers

    What is the significance of the mass of the pure compound in calculating percent purity?

    <p>It is used to determine the percent purity of the sample</p> Signup and view all the answers

    What is the purpose of using a standard solution of known concentration in a titration?

    <p>To determine the concentration of the unknown solution</p> Signup and view all the answers

    What is the result of dividing the given molar mass of the compound by the molar mass of the empirical formula?

    <p>The multiplier</p> Signup and view all the answers

    What determines the maximum amount of product that can be formed in a chemical reaction?

    <p>The amount of limiting reagent</p> Signup and view all the answers

    What is the purpose of calculating the mole ratios of the reactants in a chemical reaction?

    <p>To identify the limiting reagent</p> Signup and view all the answers

    What is the significance of a low percent yield in an industrial process?

    <p>It indicates a high waste production</p> Signup and view all the answers

    What is the difference between the molecular and empirical formulae of a compound?

    <p>The molecular formula shows the actual number of atoms, while the empirical formula shows the simplest whole-number ratio of atoms</p> Signup and view all the answers

    What is the result of dividing the actual yield of a product by the theoretical yield?

    <p>The percent yield of the reaction</p> Signup and view all the answers

    What is the purpose of identifying the excess reagent in a chemical reaction?

    <p>To identify the reactant that is not completely used up in the reaction</p> Signup and view all the answers

    What is the significance of the mole ratio of the reactants in a chemical reaction?

    <p>It determines the limiting reagent of the reaction</p> Signup and view all the answers

    What is the advantage of a high percent yield in an industrial process?

    <p>It reduces the waste production and the consumption of expensive reagents</p> Signup and view all the answers

    What is the primary purpose of calculating the moles of each element in determining empirical and molecular formulae?

    <p>To find the simplest ratio of the elements</p> Signup and view all the answers

    What is the significance of the multiplier in determining molecular formulae?

    <p>It is used to convert the empirical formula to the molecular formula</p> Signup and view all the answers

    What is the primary purpose of titration in chemical analysis?

    <p>To determine the concentration of an unknown solution</p> Signup and view all the answers

    What is the relationship between the mass of the pure compound and the mass of the sample in calculating percent purity?

    <p>The mass of the pure compound is proportional to the mass of the sample</p> Signup and view all the answers

    What is the primary purpose of finding the simplest ratio of the elements in determining empirical and molecular formulae?

    <p>To write the empirical formula</p> Signup and view all the answers

    What is the relationship between the volumes of solutions A and B in a titration?

    <p>The volume of solution A is proportional to the volume of solution B</p> Signup and view all the answers

    What is the primary purpose of calculating the molar mass of the empirical formula in determining molecular formulae?

    <p>To determine the multiplier</p> Signup and view all the answers

    What is the significance of the stoichiometric coefficients in a titration?

    <p>They represent the ratio of the reactants in the balanced equation</p> Signup and view all the answers

    What is the primary reason for determining the limiting reagent in a chemical reaction?

    <p>To determine the maximum amount of product that can be formed</p> Signup and view all the answers

    Which of the following is not a step in determining the empirical formula of a compound?

    <p>Calculating the theoretical yield of the reaction</p> Signup and view all the answers

    What is the significance of the mole ratio of the reactants in a chemical reaction?

    <p>It determines the limiting reagent</p> Signup and view all the answers

    What is the result of dividing the actual yield of a product by the theoretical yield?

    <p>Percent yield</p> Signup and view all the answers

    What is the relationship between the molecular and empirical formulae of a compound?

    <p>The molecular formula is a multiple of the empirical formula</p> Signup and view all the answers

    What is the purpose of calculating the mole ratios of the reactants in a chemical reaction?

    <p>To identify the limiting reagent</p> Signup and view all the answers

    What is the significance of a high percent yield in an industrial process?

    <p>It indicates a high efficiency of the reaction</p> Signup and view all the answers

    What is the purpose of comparing the mole ratios of the reactants to the ratios given by the balanced equation?

    <p>To identify the limiting reagent</p> Signup and view all the answers

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