Atomic Structure and Isotopes
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Atomic Structure and Isotopes

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Questions and Answers

What defines an element's identity?

  • Atomic mass
  • Number of protons (correct)
  • Number of electrons
  • Number of neutrons

    • What is the difference between isotopes of the same element?

  • Atomic mass
  • Number of protons
  • Number of electrons
  • Number of neutrons (correct)

    • How is the relative atomic mass of a sample calculated?

  • By subtracting the number of neutrons from the atomic mass
  • By adding the masses of all isotopes
  • By dividing the atomic mass by the number of protons
  • By multiplying the isotope's percentage by its mass and adding the results together (correct)

    • What was the main discovery of Ernest Rutherford's alpha scattering experiment?

    <p>A dense, positively-charged nucleus</p> Signup and view all the answers

    What is the concept of electron shells proposed by Niels Bohr?

    <p>Electrons flying in distinct shells at different distances from the nucleus</p> Signup and view all the answers

    What is the main difference between Dalton's atomic model and J.J. Thompson's plum pudding model?

    <p>The presence of electrons</p> Signup and view all the answers

    What is Avogadro's number also known as?

    <p>6.02 x 10^23</p> Signup and view all the answers

    What is the relative atomic mass of an atom based on?

    <p>1/12 of the mass of carbon-12</p> Signup and view all the answers

    What is the main concept behind the law of conservation of mass?

    <p>No atoms are lost or made during a chemical reaction.</p> Signup and view all the answers

    What is the purpose of calculating the relative formula mass?

    <p>To calculate the weight of a substance</p> Signup and view all the answers

    What is the unit of concentration in quantitative chemistry?

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

    What is the symbol for relative formula mass?

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

    What is the purpose of the balance symbol equation in quantitative chemistry?

    <p>To calculate the predicted yield or expected yield</p> Signup and view all the answers

    What happens to the atoms when heating up calcium carbonate?

    <p>They are released into the atmosphere and are no longer being weighed.</p> Signup and view all the answers

    What is the relationship between a decimeter cubed and a liter?

    <p>A decimeter cubed is equivalent to a liter</p> Signup and view all the answers

    What is the name of the molecule made up of 60 carbon atoms joined together?

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

    What is silicon dioxide also known as?

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

    What is the first step in calculating the moles of a substance?

    <p>Determining the relative formula mass</p> Signup and view all the answers

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