COMPOSITION OF SUBSTANCE SUMMARY CHAP 3
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Questions and Answers

What is another term for the formula mass of a covalent compound?

  • Atomic number
  • Avogadro's number
  • Molecular mass (correct)
  • Molar mass

    • Which quantity is represented by Avogadro's number?

  • Atomic mass units of a substance
  • Number of protons in an atom
  • Molar mass of a compound
  • Number of entities in 1 mole of substance (correct)

    • How does the formula mass (amu) compare to the molar mass (g/mol) for any substance?

  • Molar mass is larger than formula mass
  • They are equal (correct)
  • Formula mass is in kg, while molar mass is in g/mol
  • Formula mass is larger than molar mass

    • What defines the chemical identity of a substance?

    <p>The types and relative numbers of atoms in its molecules or ions</p> Signup and view all the answers

    What does a compound's percent composition provide?

    <p>The mass percentage of each element in the compound</p> Signup and view all the answers

    Why is the empirical formula of a covalent compound compared to its molar mass?

    <p>To derive its molecular formula</p> Signup and view all the answers

    What type of mixtures are solutions?

    <p>Homogeneous mixtures</p> Signup and view all the answers

    What is the definition of molarity?

    <p>The number of moles of solute per liter of solution</p> Signup and view all the answers

    Which unit is used to express lower concentrations conveniently?

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

    What does dilution refer to in the context of solutions?

    <p>Decreasing the solute concentration</p> Signup and view all the answers

    An aqueous solution is one where the solvent is:

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

    Which term is used for the components dissolved in a solvent?

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

    What type of units are commonly used in environmental, medical, and other fields?

    <p>Mass-based units</p> Signup and view all the answers

    Which equation represents a relation between concentrations and volumes of a solution before and after dilution?

    <p>Dilution formula</p> Signup and view all the answers

    What is a measure of the relative amount of solute in a given amount of solution?

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

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