CHAP 3 KEY TERMS
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Questions and Answers

What is Avogadro's number experimentally determined value for the number of entities comprising 1 mole of a substance?

  • 6.022 × 10^23 mol−1 (correct)
  • 4.022 × 10^23 mol−1
  • 7.022 × 10^23 mol−1
  • 5.022 × 10^23 mol−1

    • What does the term 'dilute' refer to in a solution?

  • Presence of a high concentration of solvent
  • Adding solvent to lower solute concentration (correct)
  • Quantitative measure of solute and solvent
  • Relatively high concentration of solute

    • How is 'molarity (M)' defined?

  • Sum of average atomic masses for all atoms represented in an empirical formula
  • Number of moles of solute dissolved in 1 liter of solution (correct)
  • Ratio of solute-to-solution mass expressed as a percentage
  • Mass in grams of 1 mole of a substance

    • What is the formula to calculate mass percentage?

    <p>Ratio of solute-to-solution mass multiplied by 10^9</p> Signup and view all the answers

    What does 'empirical formula mass' represent?

    <p>Sum of average atomic masses for all atoms represented in an empirical formula</p> Signup and view all the answers

    What is 'parts per billion (ppb)'?

    <p>Ratio of solute-to-solution mass multiplied by 10^9</p> Signup and view all the answers

    What does 'solute' refer to in a solution?

    <p>Solution component present in a concentration less than that of the solvent</p> Signup and view all the answers

    'Formula mass' is the sum of what for all atoms represented in a chemical formula?

    <p>(Average) masses for all atoms</p> Signup and view all the answers

    'Mass-volume percent' is the ratio of what expressed as a percentage?

    <p>(Solute) mass to solution volume</p> Signup and view all the answers

    'Volume percentage' refers to the ratio of what expressed as a percentage?

    <p>(Solute-to-solution) volume</p> Signup and view all the answers

    What does the term 'solute' refer to in a solution?

    <p>Solution component present in a concentration less than that of the solvent</p> Signup and view all the answers

    How is 'mass percentage' calculated?

    <p>Ratio of solute-to-solution mass expressed as a percentage</p> Signup and view all the answers

    What is the unit of concentration defined as the number of moles of solute dissolved in 1 liter of solution?

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

    Which term describes the process by which solute components are dispersed in a solvent?

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

    What is the ratio of solute-to-solution mass multiplied by 106 known as?

    <p>Parts per million (ppm)</p> Signup and view all the answers

    The sum of the average masses for all atoms represented in a chemical formula is known as what?

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

    'Parts per billion (ppb)' is the ratio of solute-to-solution mass multiplied by how much?

    <p>$10^9$</p> Signup and view all the answers

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