Gr 11 Physical Sciences: Ch 6 Sum Quantitative aspects of chemical change
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Questions and Answers

At standard temperature and pressure (STP), what is the volume occupied by one mole of a gas?

  • 11.2 dm³
  • 44.8 dm³
  • 33.6 dm³
  • 22.4 dm³ (correct)

    • What is the unit of the gas constant R in the ideal gas equation?

  • Pa·K⁻¹·mol⁻¹
  • J·K⁻¹·mol⁻¹ (correct)
  • J·mol⁻¹·K⁻¹
  • Pa·m³·K⁻¹·mol⁻¹

    • What is the formula to calculate the volume of gas at STP, given the number of moles of gas?

  • V_g = 22.4 × n_g (correct)
  • V_g = 22.4 + n_g
  • V_g = 22.4 - n_g
  • V_g = 22.4 / n_g

    • What is the formula to calculate the concentration of a solution?

    <p>C = n / V</p> Signup and view all the answers

    What is the unit of concentration of a solution?

    <p>mol·dm⁻³</p> Signup and view all the answers

    How are the volumes of gases involved in chemical reactions related?

    <p>V_A = a / b × V_B</p> Signup and view all the answers

    What is the definition of standard temperature and pressure (STP)?

    <p>273 K and 101.3 kPa</p> Signup and view all the answers

    What is the value of the gas constant R in the ideal gas equation?

    <p>8.31 J·K⁻¹·mol⁻¹</p> Signup and view all the answers

    What is the purpose of a titration?

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

    What is the formula to calculate the unknown concentration in a titration?

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

    What is the definition of a limiting reagent?

    <p>A reagent that is completely consumed first in a chemical reaction</p> Signup and view all the answers

    What is the formula to calculate percent yield?

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

    What is the difference between empirical and molecular formulae?

    <p>Empirical formula is the simplest ratio, while molecular formula is the actual formula</p> Signup and view all the answers

    What is the purpose of determining the percent purity of a substance?

    <p>To determine the quality of a substance, especially in pharmaceuticals and industrial processes</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 first step in determining the empirical and molecular formulae of a compound?

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

    What is the limiting reagent in a chemical reaction?

    <p>The reactant that is completely used up first</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 symbol for the ideal gas constant?

    <p>R</p> Signup and view all the answers

    What is the purpose of stoichiometric calculations?

    <p>To determine the amounts of reactants and products in a chemical reaction</p> Signup and view all the answers

    What is the significance of percent yield in industrial processes?

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

    What is the molar volume of an ideal gas at STP?

    <p>22.4 dm³/mol</p> Signup and view all the answers

    What is the first step in solving problems involving gaseous reactions?

    <p>Determine the molar mass of the reactant</p> Signup and view all the answers

    What is the formula to calculate the number of moles of a reactant?

    <p>n = m / M</p> Signup and view all the answers

    What is the purpose of using the stoichiometric ratios?

    <p>To find the mole ratio between the reactant and the gaseous product</p> Signup and view all the answers

    What is the unit of the molar volume at STP?

    <p>dm³/mol</p> Signup and view all the answers

    What is the value of the volume of one mole of a gas at STP in liters?

    <p>22.4 L</p> Signup and view all the answers

    What is the purpose of determining the percent purity of a substance?

    <p>To verify the quality of a substance</p> Signup and view all the answers

    What is the formula to calculate the volume of a gas if the number of moles is known?

    <p>V_g = 22.4 n_g</p> Signup and view all the answers

    What is the purpose of the formula V_A = a/b V_B in chemical reactions?

    <p>To relate the volumes of gases involved in chemical reactions</p> Signup and view all the answers

    What is the relationship between the reactants in a titration?

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

    What is the ideal gas law used for?

    <p>To relate the pressure, volume, temperature, and number of moles of a gas</p> Signup and view all the answers

    What is the unit of concentration of a solution?

    <p>mol·dm⁻³</p> Signup and view all the answers

    What is the unit of the number of moles of a gas?

    <p>mol</p> Signup and view all the answers

    What is the formula to calculate the number of moles of a solute in a solution?

    <p>n = C V</p> Signup and view all the answers

    What is the purpose of using the stoichiometric ratios in gaseous reactions?

    <p>To find the mole ratio between the reactant and the gaseous product</p> Signup and view all the answers

    What is the relationship between the number of moles of a gas and its volume at STP?

    <p>The volume of a gas is directly proportional to the number of moles</p> Signup and view all the answers

    What is the purpose of the ideal gas equation pV = nRT?

    <p>To describe the behavior of an ideal gas</p> Signup and view all the answers

    What is the next step after calculating the number of moles of the reactant in gaseous reactions?

    <p>Use the stoichiometric ratios to find the mole ratio</p> Signup and view all the answers

    What is the unit of the number of moles of a gas?

    <p>mol</p> Signup and view all the answers

    What is the value of the molar volume at STP?

    <p>22.4 dm³/mol</p> Signup and view all the answers

    What is the purpose of using the ideal gas law in gaseous reactions?

    <p>To relate the pressure, volume, temperature, and number of moles of a gas</p> Signup and view all the answers

    What is the primary purpose of stoichiometric calculations?

    <p>To calculate the amounts of reactants and products in a chemical reaction</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 significance of the limiting reagent in a chemical reaction?

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

    What is the formula used to calculate the percent yield of a chemical reaction?

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

    What is the purpose of determining the empirical and molecular formulae of a compound?

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

    What is the significance of percent yield in industrial processes?

    <p>It indicates the efficiency and cost-effectiveness of the reaction</p> Signup and view all the answers

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

    <p>Assume 100 grams of the compound</p> Signup and view all the answers

    What is the purpose of identifying 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

    What is the primary purpose of determining the percent purity of a substance?

    <p>To determine the quality of the substance</p> Signup and view all the answers

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

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

    What is the molar volume of an ideal gas at STP, in liters?

    <p>22.4 L</p> Signup and view all the answers

    What is the relationship between the volumes of gases A and B in a chemical reaction?

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

    What is the unit of concentration of a solution?

    <p>mol·dm⁻³</p> Signup and view all the answers

    What is the purpose of the ideal gas equation pV = nRT?

    <p>To relate the pressure, volume, and temperature of an ideal gas</p> Signup and view all the answers

    What is the formula used to calculate the volume of a gas, given the number of moles of the gas?

    <p>V = 22.4n</p> Signup and view all the answers

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

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

    What is the purpose of stoichiometric calculations in chemistry?

    <p>To relate the quantities of reactants and products in a chemical reaction</p> Signup and view all the answers

    What is the formula used to calculate the concentration of a solution, given the number of moles of solute and the volume of the solution?

    <p>C = n/V</p> Signup and view all the answers

    What is the main 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

    What is the purpose of stoichiometric calculations?

    <p>To calculate the amounts of reactants and products in a chemical reaction</p> Signup and view all the answers

    What is the formula used to calculate the unknown concentration in a titration?

    <p>CA VA = CB VB/a</p> Signup and view all the answers

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

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

    What is the purpose of determining the percent purity of a substance?

    <p>To determine the quality of chemical substances, especially in pharmaceuticals and industrial processes</p> Signup and view all the answers

    What is the formula used to calculate the percent yield of a chemical reaction?

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

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

    <p>It is the reactant that determines the maximum amount of product that can be formed</p> Signup and view all the answers

    What is the purpose of performing a titration?

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

    What is the formula used to calculate the mole ratio of the reactants in a chemical reaction?

    <p>a/b = mole ratio of reactant A to reactant B</p> Signup and view all the answers

    What is the significance of percent yield in industrial processes?

    <p>It determines the cost-effectiveness of the reaction</p> Signup and view all the answers

    What is the primary purpose of using the stoichiometric ratios in gaseous reactions?

    <p>To find the mole ratio between the reactant and the gaseous product</p> Signup and view all the answers

    In a titration, what is the relationship between the volumes of solutions A and B?

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

    What is the unit of the molar volume at STP?

    <p>Dm³/mol</p> Signup and view all the answers

    What is the purpose of using the ideal gas law in gaseous reactions?

    <p>To relate the pressure, volume, temperature, and number of moles of a gas</p> Signup and view all the answers

    What is the formula used to calculate the number of moles of a reactant?

    <p>n = m / M</p> Signup and view all the answers

    What is the purpose of calculating the percent purity of a substance?

    <p>To express the amount of pure compound in a sample as a percentage</p> Signup and view all the answers

    What is the significance 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 primary purpose of stoichiometric calculations?

    <p>To relate the amount of reactants and products in a chemical reaction</p> Signup and view all the answers

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