Gr 10 Physical Sciences Ch 14: Atomic mass and the mole
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Questions and Answers

What is the SI unit for the amount of substance?

  • Molar Mass
  • Atomic Mass
  • Avogadro's Number
  • Mole (correct)

    • What is the number of particles in a mole?

  • 6.022 x 10^25
  • 6.022 x 10^23 (correct)
  • 6.022 x 10^22
  • 6.022 x 10^24

    • What is the mass of one mole of carbon?

  • 12 grams (correct)
  • 20 grams
  • 15 grams
  • 10 grams

    • What is the molar mass of an element expressed in?

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

    What is the molar mass of carbon?

    <p>12 g/mol</p> Signup and view all the answers

    What is the relationship between the molar mass of an element and its relative atomic mass?

    <p>They are equal</p> Signup and view all the answers

    How many copper atoms are in 63.5 grams of copper?

    <p>6.022 x 10^23</p> Signup and view all the answers

    What is the purpose of Avogadro's number in chemistry?

    <p>To count particles at the atomic or molecular scale</p> Signup and view all the answers

    What is the unit of molar mass?

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

    What is the formula mass of a compound?

    <p>The sum of the atomic masses of all atoms in a formula unit</p> Signup and view all the answers

    What is the importance of the mole ratio in a chemical reaction?

    <p>It determines how much of each reactant is needed</p> Signup and view all the answers

    What is the relationship between mass, molar mass, and the number of moles?

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

    How do you calculate the molar mass of a compound?

    <p>By adding the atomic masses of all atoms in the compound</p> Signup and view all the answers

    What is the number of molecules in one mole of a substance?

    <p>6.022 × 10^23</p> Signup and view all the answers

    Why are moles, molar mass, and formula mass important in chemical reactions?

    <p>To quantify the reaction and determine the amount of reactants needed</p> Signup and view all the answers

    When calculating the molar mass of a compound, what do you add up?

    <p>The molar masses of all atoms in a formula unit</p> Signup and view all the answers

    What is the primary purpose of understanding atomic mass and the mole in chemical reactions?

    <p>To determine the quantities of each substance involved in a reaction</p> Signup and view all the answers

    What is the significance of Avogadro's number in chemistry?

    <p>It is the number of particles in a mole</p> Signup and view all the answers

    What is the molar mass of an element numerically equal to?

    <p>Its relative atomic mass</p> Signup and view all the answers

    What is the unit of molar mass?

    <p>Grams per mole</p> Signup and view all the answers

    What is the significance of the mole in chemical reactions?

    <p>It helps determine the quantities of each substance involved</p> Signup and view all the answers

    What is the relationship between the number of moles of a substance and its mass?

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

    What is the purpose of using molar mass in chemical reactions?

    <p>To calculate the mass of a substance involved in a reaction</p> Signup and view all the answers

    What is the significance of the mole in counting particles at the atomic or molecular scale?

    <p>It allows us to count particles in large quantities</p> Signup and view all the answers

    What is the number of moles of nitrogen molecules that react with three moles of hydrogen molecules to produce two moles of ammonia molecules?

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

    What is the formula mass of sodium chloride?

    <p>Sum of atomic masses of sodium and chlorine</p> Signup and view all the answers

    What is the molar mass of nitric acid (HNO₃) calculated by?

    <p>Summing the molar masses of hydrogen, nitrogen, and three oxygen atoms</p> Signup and view all the answers

    Why are moles, molar mass, and formula mass important in chemical reactions?

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

    What is the unit of the number of moles?

    <p>No unit</p> Signup and view all the answers

    What is the purpose of the mole ratio in a chemical reaction?

    <p>To calculate the amount of reactants needed</p> Signup and view all the answers

    How many moles of ammonia molecules are produced when one mole of nitrogen molecules reacts with three moles of hydrogen molecules?

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

    What is the molar mass of a compound calculated by?

    <p>Summing the molar masses of all atoms in the compound</p> Signup and view all the answers

    What is the formula mass of a compound equal to?

    <p>The sum of the atomic masses of all atoms in a formula unit of the compound</p> Signup and view all the answers

    What is the purpose of the mole ratio in a chemical reaction?

    <p>To determine how much of each reactant is needed to produce a desired amount of product</p> Signup and view all the answers

    In the equation n = m/M, what does M represent?

    <p>The molar mass in grams per mole</p> Signup and view all the answers

    What is the unit of the molar mass of a compound?

    <p>Grams per mole</p> Signup and view all the answers

    What is the significance of the mole ratio in a balanced chemical equation?

    <p>It shows the mole ratio in which the reactants combine to form a product</p> Signup and view all the answers

    What is the molar mass of a compound calculated by?

    <p>Adding up the atomic masses of all atoms in the compound</p> Signup and view all the answers

    What is the relationship between the number of moles and the mass of a substance?

    <p>The number of moles is directly proportional to the mass of the substance</p> Signup and view all the answers

    What is the primary purpose of understanding moles, molar mass, and formula mass in chemical reactions?

    <p>To quantify the amount of reactants and products</p> Signup and view all the answers

    What is the primary function of Avogadro's number in chemistry?

    <p>To count particles at the atomic or molecular scale</p> Signup and view all the answers

    What is the relationship between the molar mass of an element and its relative atomic mass?

    <p>The molar mass is numerically equal to the relative atomic mass</p> Signup and view all the answers

    How many moles of iron sulfide (FeS) can be produced from 12.0 grams of iron?

    <p>0.5 moles</p> Signup and view all the answers

    What is the purpose of using the concept of the mole in chemistry?

    <p>To quantify chemical reactions</p> Signup and view all the answers

    What is the molar mass of a sample of iron sulfide (FeS)?

    <p>87.91 g/mol</p> Signup and view all the answers

    How many iron atoms are present in 12.0 grams of iron?

    <p>6.022 x 10^23 atoms</p> Signup and view all the answers

    What is the significance of understanding atomic mass and the mole in chemical reactions?

    <p>To quantify the amounts of reactants and products</p> Signup and view all the answers

    What is the relationship between the number of moles of a substance and its mass?

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

    What is the primary function of Avogadro's number in chemical reactions?

    <p>To count particles at the atomic or molecular scale</p> Signup and view all the answers

    What is the relationship between the molar mass of an element and its relative atomic mass?

    <p>The molar mass is equal to the relative atomic mass</p> Signup and view all the answers

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

    <p>It determines the ratio of reactants to products</p> Signup and view all the answers

    What is the unit of the molar mass of a compound?

    <p>Grams per mole (g/mol)</p> Signup and view all the answers

    What is the primary purpose of understanding atomic mass and the mole in chemical reactions?

    <p>To quantify the amounts of reactants and products</p> Signup and view all the answers

    What is the significance of the mole in chemical reactions?

    <p>It is used to count particles at the atomic or molecular scale</p> Signup and view all the answers

    What is the relationship between the number of moles of a substance and its mass?

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

    What is the purpose of using the concept of the mole in chemistry?

    <p>To quantify the amounts of reactants and products</p> Signup and view all the answers

    What is the mole ratio of nitrogen molecules to ammonia molecules in the reaction N₂ + 3H₂ → 2NH₃?

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

    A certain compound has a formula mass of 180.16 g/mol. If the molar mass of oxygen is 16.00 g/mol, how many oxygen atoms are present in the compound?

    <p>11</p> Signup and view all the answers

    What is the number of moles of hydrogen molecules required to react with one mole of nitrogen molecules to produce two moles of ammonia molecules?

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

    A 20.0 gram sample of sodium chloride (NaCl) contains how many moles of NaCl?

    <p>0.4</p> Signup and view all the answers

    What is the molar mass of a compound with the formula H₂SO₄?

    <p>96.07 g/mol</p> Signup and view all the answers

    A certain reaction requires 2.0 moles of reactant A to produce 3.0 moles of product B. What is the mole ratio of reactant A to product B?

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

    A 30.0 gram sample of nitric acid (HNO₃) contains how many moles of HNO₃?

    <p>0.5</p> Signup and view all the answers

    What is the formula mass of calcium carbonate (CaCO₃)?

    <p>101.09 g/mol</p> Signup and view all the answers

    What is the purpose of calculating the molar mass of a compound?

    <p>To quantify the amount of reactants required for a chemical reaction</p> Signup and view all the answers

    What is the formula mass of a compound?

    <p>The sum of the molar masses of all atoms in a molecule</p> Signup and view all the answers

    What is the significance of the mole ratio in a balanced chemical equation?

    <p>It shows the number of moles of each reactant required</p> Signup and view all the answers

    What is the relationship between the mass of a substance and the number of moles?

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

    What is the purpose of understanding the concept of moles in chemical reactions?

    <p>To quantify the amount of reactants required for a chemical reaction</p> Signup and view all the answers

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