Biology Chapter 2: Chemical Building Blocks Quiz
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Questions and Answers

Which of the following is a substance formed when two or more elements chemically combine in fixed ratios?

  • Isotope
  • Compound (correct)
  • Ion
  • Atom

    • What is the basic unit of a chemical element?

  • Molecule
  • Isotope
  • Atom (correct)
  • Ion

    • Which type of ion is formed when an atom gains one or more electrons?

  • Molecule
  • Isotope
  • Cation
  • Anion (correct)

    • What are variants of a chemical element that have the same number of protons but a different number of neutrons in their nuclei?

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

    What is a positively charged ion formed when an atom loses one or more electrons?

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

    Which particle is formed when an atom gains or loses electrons?

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

    What is the charge of a proton?

    <p>Positively charged</p> Signup and view all the answers

    Where are electrons located in an atom?

    <p>Outside the nucleus in electron orbitals</p> Signup and view all the answers

    What determines the element to which an atom belongs?

    <p>Atomic number</p> Signup and view all the answers

    What is a covalent bond?

    <p>A bond formed by the sharing of electron pairs between atoms</p> Signup and view all the answers

    What is the mass of a neutron?

    <p>Approximately 1 atomic mass unit (amu)</p> Signup and view all the answers

    Which of the following compounds has covalent bonds?

    <p>$CO_2$ (Carbon Dioxide)</p> Signup and view all the answers

    Where are protons located in an atom?

    <p>In the atom's nucleus</p> Signup and view all the answers

    What is the charge of an electron?

    <p>$-1$ elementary charge</p> Signup and view all the answers

    Which subatomic particle contributes most to an atom's mass?

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

    What allows each atom to attain a more stable electron configuration in a covalent bond?

    <p>Sharing of electron pairs between atoms</p> Signup and view all the answers

    Which of the following accurately describes the formation of a compound?

    <p>A compound is formed when two or more elements chemically combine in fixed ratios.</p> Signup and view all the answers

    What is the primary factor leading to variations in atomic mass among isotopes of the same element?

    <p>Variations in the number of neutrons</p> Signup and view all the answers

    When an atom gains electrons, it becomes:

    <p>A negatively charged ion</p> Signup and view all the answers

    What type of ion is attracted to negatively charged ions and often involved in ionic bonds?

    <p>A cation</p> Signup and view all the answers

    What is the basic unit of a chemical element?

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

    In an ionic bond, what contributes to the formation of positively and negatively charged ions?

    <p>Transfer of electrons between atoms</p> Signup and view all the answers

    What is the primary location of electrons in an atom?

    <p>Electron orbitals</p> Signup and view all the answers

    What determines the element to which an atom belongs?

    <p>Proton count</p> Signup and view all the answers

    Which type of chemical bond involves the sharing of electron pairs between atoms?

    <p>Covalent bond</p> Signup and view all the answers

    Where are neutrons located in an atom?

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

    Which particle contributes most to an atom's mass?

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

    Which of the following compounds contains covalent bonds?

    <p>Carbon dioxide (CO₂)</p> Signup and view all the answers

    What is the charge of an electron?

    <p>-1 elementary charge</p> Signup and view all the answers

    What is the mass of a neutron?

    <p>~1 atomic mass unit (amu)</p> Signup and view all the answers

    What allows each atom to attain a more stable electron configuration in a covalent bond?

    <p>Sharing of electron pairs</p> Signup and view all the answers

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