Basic Concepts of Chemistry Substance Quiz
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Questions and Answers

What is the definition of a substance?

  • Anything with mass and volume (correct)
  • Anything with only volume
  • Anything with only mass
  • Anything with color

    • How is the atomic weight of an element calculated?

  • By calculating the number of molecules in the element
  • By calculating the number of atoms in the element
  • By calculating the mass of one atom of the element (correct)
  • By calculating the molecular weight

    • What is the definition of a mole?

  • The number of atoms in a molecule
  • A collection of Avogadro’s number of any particle (correct)
  • The weight of a compound
  • The mass of one carbon atom

    • How is the molecular weight of a compound calculated?

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

    How are moles of atoms calculated?

    <p>By dividing the weight of the elemental sample by Avogadro's number</p> Signup and view all the answers

    How are moles of molecules calculated?

    <p>By dividing the weight of the sample by Avogadro's number</p> Signup and view all the answers

    What is the volume of a gaseous sample directly proportional to, according to Avogadro’s hypothesis?

    <p>The number of gaseous moles present</p> Signup and view all the answers

    What is the number of molecules in 1 ml of gas at S.T.P. as per Loschmidt number?

    <p>$2.687 \times 10^{19}$</p> Signup and view all the answers

    What is equivalent weight equal to?

    <p>Molecular weight multiplied by n-factor</p> Signup and view all the answers

    What does the n-factor represent for any acid?

    <p>Number of H replaced or e-pair gained by its molecule</p> Signup and view all the answers

    What does the n-factor represent for any base?

    <p>Number of H+ gained by its molecule</p> Signup and view all the answers

    What is the concentration unit that represents the amount of solute present in a definite amount of solution?

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

    In 100 ml of its aqueous solution, 4g NaOH is present. What is the molarity?

    <p>$0.1M$</p> Signup and view all the answers

    What is the number of milliequivalents of H2SO4 present in 50 ml of N/20 H2SO4?

    <p>$2.5$</p> Signup and view all the answers

    $10g$ HCl are dissolved in $250ml$ of its aqueous solution. If density of the solution is $1.2g$, what is the molality?

    <p>$2m$</p> Signup and view all the answers

    What is the gram equivalent for any salt?

    <p>The total cation or anionic charge</p> Signup and view all the answers

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