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 (B)</p> Signup and view all the answers

What is the unit of concentration of a solution?

<p>mol·dm⁻³ (D)</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 (A)</p> Signup and view all the answers

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

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

What is the purpose of a titration?

<p>To determine the concentration of an unknown solution (A)</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 (C)</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 (D)</p> Signup and view all the answers

What is the formula to calculate percent yield?

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

What is the formula for percent purity?

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

What is the purpose of titration?

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

What is the symbol for the ideal gas constant?

<p>R (C)</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 (C)</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 (C)</p> Signup and view all the answers

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

<p>22.4 dm³/mol (B)</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 (A)</p> Signup and view all the answers

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

<p>n = m / M (A)</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 (B)</p> Signup and view all the answers

What is the unit of the molar volume at STP?

<p>dm³/mol (A)</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 (D)</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 (A)</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 (A)</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 (D)</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 (B)</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 (C)</p> Signup and view all the answers

What is the unit of concentration of a solution?

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

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

<p>mol (D)</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 (B)</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 (D)</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 (C)</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 (D)</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 (D)</p> Signup and view all the answers

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

<p>mol (D)</p> Signup and view all the answers

What is the value of the molar volume at STP?

<p>22.4 dm³/mol (C)</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 (A)</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 (A)</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 (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 (A)</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 (C)</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 (A)</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 (B)</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 (B)</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 (D)</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 (C)</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 (C)</p> Signup and view all the answers

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

<p>22.4 L (D)</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 (A)</p> Signup and view all the answers

What is the unit of concentration of a solution?

<p>mol·dm⁻³ (C)</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 (A)</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 (C)</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 (C)</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 (D)</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 (C)</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 (D)</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 (C)</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 (D)</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 (D)</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 (D)</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 (A)</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 (A)</p> Signup and view all the answers

What is the purpose of performing a titration?

<p>To determine the concentration of a solution (B)</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 (A)</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 (D)</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 (B)</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 (D)</p> Signup and view all the answers

What is the unit of the molar volume at STP?

<p>Dm³/mol (C)</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 (A)</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 (B)</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 (D)</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 (A)</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 (C)</p> Signup and view all the answers

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