Gr 10 Physical Sciences Ch 14: Stoichiometric calculations
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Questions and Answers

What is the main purpose of stoichiometric calculations?

  • To understand the mechanism of a chemical reaction
  • To determine the rate of a chemical reaction
  • To identify the reactants and products in a chemical reaction
  • To calculate the quantities of reactants and products in a chemical reaction (correct)

    • What is the basis of stoichiometric calculations?

  • The relationships between moles, mass, and volume
  • The relationships between reactants and products
  • The relationships between rate and equilibrium
  • The relationships between moles, mass, volume, and concentration (correct)

    • What is the theoretical yield of a reaction?

  • The amount of reactant needed to produce a product
  • The maximum amount of product that can be formed from a given amount of reactants (correct)
  • The amount of product formed in a reaction
  • The amount of product formed in a reaction under standard conditions

    • What is the first step in calculating the theoretical yield of a reaction?

    <p>Write the balanced chemical equation</p> Signup and view all the answers

    What is used to convert the mass of reactants to moles?

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

    What is the mole ratio used for in calculating the theoretical yield?

    <p>To apply the coefficients from the balanced equation to determine the mole ratio between reactants and products</p> Signup and view all the answers

    What is the final step in calculating the theoretical yield of a reaction?

    <p>Convert moles of product to mass</p> Signup and view all the answers

    Why is the balanced chemical equation important in stoichiometric calculations?

    <p>It reflects the correct stoichiometric relationships between reactants and products</p> Signup and view all the answers

    What is the first step in calculating the theoretical yield of a reaction?

    <p>Balance the Equation</p> Signup and view all the answers

    In the reaction 2H_2 + O_2 → 2H_2O, how many moles of H_2O are produced from 4 moles of H_2?

    <p>4 moles</p> Signup and view all the answers

    What is the percentage yield of a reaction if the theoretical yield is 72 g and the actual yield is 60 g?

    <p>83.33%</p> Signup and view all the answers

    What is the importance of stoichiometry in industry?

    <p>To scale up reactions for industrial production</p> Signup and view all the answers

    What is the actual yield of a reaction?

    <p>The amount of product actually obtained from a reaction</p> Signup and view all the answers

    Why is the actual yield often less than the theoretical yield?

    <p>Due to side reactions and loss of product during recovery</p> Signup and view all the answers

    What is the molar mass of H_2O?

    <p>18 g/mol</p> Signup and view all the answers

    What is the formula for calculating the percentage yield?

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

    What is the purpose of using mole ratios in calculating the theoretical yield?

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

    What is the effect of incomplete reactions on the actual yield?

    <p>It decreases the actual yield</p> Signup and view all the answers

    What is the benefit of optimizing the quantities of reactants in a reaction?

    <p>It reduces waste</p> Signup and view all the answers

    Why is it important to balance the chemical equation before calculating the theoretical yield?

    <p>To ensure the correct mole ratios are used</p> Signup and view all the answers

    What is the purpose of calculating the percentage yield?

    <p>To evaluate the efficiency of a reaction</p> Signup and view all the answers

    What is the relationship between the theoretical yield and the actual yield?

    <p>The actual yield is always less than the theoretical yield</p> Signup and view all the answers

    How does understanding stoichiometry help chemists?

    <p>All of the above</p> Signup and view all the answers

    Why is scaling up reactions for industrial production important?

    <p>It enables the production of larger quantities of products with maximum efficiency</p> Signup and view all the answers

    Which of the following relationships is NOT directly linked in stoichiometric calculations?

    <p>temperature and pressure</p> Signup and view all the answers

    What is the purpose of using mole ratios in calculating the theoretical yield?

    <p>to determine the mole ratio between reactants and products</p> Signup and view all the answers

    If 2 moles of reactant A are needed to produce 3 moles of product B, what is the mole ratio of A to B?

    <p>2:3</p> Signup and view all the answers

    What is the unit of the final answer when calculating the theoretical yield?

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

    Why is it essential to ensure the chemical equation is balanced before calculating the theoretical yield?

    <p>to ensure the correct stoichiometric relationships</p> Signup and view all the answers

    What is the purpose of converting given quantities to moles in stoichiometric calculations?

    <p>to allow for comparison of reactants and products</p> Signup and view all the answers

    If 4 moles of reactant A are used, and the mole ratio of A to product B is 2:3, how many moles of B can be formed?

    <p>3 moles</p> Signup and view all the answers

    What is the significance of the balanced chemical equation in stoichiometric calculations?

    <p>it provides the mole ratio between reactants and products</p> Signup and view all the answers

    What is the primary objective of stoichiometric calculations in a chemical reaction?

    <p>To predict the amount of product formed</p> Signup and view all the answers

    In a stoichiometric calculation, what is the purpose of converting given quantities to moles?

    <p>To apply the mole ratio from the balanced equation</p> Signup and view all the answers

    What is the relationship between the mole ratio and the stoichiometric coefficients in a balanced equation?

    <p>The mole ratio is directly proportional to the stoichiometric coefficients</p> Signup and view all the answers

    What is the significance of the balanced chemical equation in stoichiometric calculations?

    <p>It reflects the correct stoichiometric relationships between reactants and products</p> Signup and view all the answers

    What is the purpose of calculating the theoretical yield of a reaction?

    <p>To predict the amount of product formed under ideal conditions</p> Signup and view all the answers

    What is the result of incomplete reactions on the actual yield of a reaction?

    <p>The actual yield decreases</p> Signup and view all the answers

    What is the unit of the final answer when calculating the theoretical yield of a reaction?

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

    Why is it essential to ensure the chemical equation is balanced before calculating the theoretical yield?

    <p>To reflect the correct stoichiometric relationships between reactants and products</p> Signup and view all the answers

    What is the role of mole ratios in calculating the theoretical yield of a reaction?

    <p>To determine the number of moles of product formed</p> Signup and view all the answers

    Why is the actual yield of a reaction often less than the theoretical yield?

    <p>All of the above</p> Signup and view all the answers

    What is the significance of calculating the percentage yield of a reaction?

    <p>To determine the efficiency of the reaction</p> Signup and view all the answers

    What is the role of stoichiometry in environmental science?

    <p>To reduce waste by optimizing the quantities of reactants</p> Signup and view all the answers

    What is the purpose of balancing the chemical equation before calculating the theoretical yield?

    <p>To ensure the correct stoichiometric relationships between reactants and products</p> Signup and view all the answers

    What is the benefit of understanding stoichiometry in industrial production?

    <p>To scale up reactions for industrial production</p> Signup and view all the answers

    What is the unit of the percentage yield?

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

    What is the purpose of calculating the theoretical yield of a reaction?

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

    What is the primary assumption in calculating the theoretical yield of a reaction?

    <p>The reaction is complete and there are no losses.</p> Signup and view all the answers

    Which of the following is a consequence of not balancing the chemical equation before calculating the theoretical yield?

    <p>The mole ratio of reactants to products will be incorrect.</p> Signup and view all the answers

    What is the purpose of converting moles of product to mass in the calculation of theoretical yield?

    <p>To express the yield in a more meaningful unit.</p> Signup and view all the answers

    Which of the following is a benefit of using mole ratios in calculating the theoretical yield?

    <p>It provides a direct relationship between reactants and products.</p> Signup and view all the answers

    What is the relationship between the mole ratio and the stoichiometric coefficients in a balanced equation?

    <p>The mole ratio is the ratio of the stoichiometric coefficients.</p> Signup and view all the answers

    What is the consequence of having a mole ratio of 2:3 for reactant A to product B?

    <p>Two moles of A are required to produce three moles of B.</p> Signup and view all the answers

    What is the purpose of calculating the percentage yield of a reaction?

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

    Which of the following is a limitation of stoichiometric calculations?

    <p>They assume complete reactions and no losses.</p> Signup and view all the answers

    What is the primary reason why the actual yield is often less than the theoretical yield in a chemical reaction?

    <p>Because of the loss of product during recovery</p> Signup and view all the answers

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

    <p>To measure the efficiency of the reaction</p> Signup and view all the answers

    What is the role of mole ratios in calculating the theoretical yield of a reaction?

    <p>To convert moles of reactants to moles of products</p> Signup and view all the answers

    What is the significance of understanding stoichiometry in environmental science?

    <p>It helps in reducing waste by optimizing the quantities of reactants</p> Signup and view all the answers

    What is the result of incomplete reactions on the actual yield of a reaction?

    <p>The actual yield is less than the theoretical yield</p> Signup and view all the answers

    What is the purpose of converting given quantities to moles in stoichiometric calculations?

    <p>To enable the use of mole ratios in calculations</p> Signup and view all the answers

    What is the relationship between the mole ratio and the stoichiometric coefficients in a balanced equation?

    <p>The mole ratio is the ratio of the stoichiometric coefficients</p> Signup and view all the answers

    What is the unit of the percentage yield?

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

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