chem hw 16

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chem hw 16
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2010-04-11 20:15:23
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chem hw 16
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  1. Review Question 1:
    How many electrons can occupy the first shell?
    How many can occupy the second shell?
    • Two electrons can occupy the first shell.
    • Eight electrons can occupy the second shell.
  2. Review Question 2:
    Which electrons are represented by an electron-dot structure?
    The valence electrons are represented by the electron-dot structure.
  3. RQ 3:
    How do the electron-dot structures of elements in the same group in the periodic table compare with one another?
    The electron-dot structures of elements in the same group are the same because they have the same number of valence electrons.
  4. RQ5:
    How does an ion differ from an atom?
    An ion is an atom with a charge, due to a loss or gain of electrons.
  5. RQ6:
    To become a negative ion, does an atom lose or gain electrons?
    A negative ion means the atom as gained an electron.
  6. RQ7:
    Why does the fluorine atom tend to gain only one electron?
    The fluorine atom needs atom needs only one electron to fill its valence shell.
  7. RQ9:
    Which elements tend to form ionic bonds?
    The atoms from the far left and the far right in the periodic table.
  8. RQ10:
    What is the electric charge on the calcium ion in calcium chloride, CaCI2?
    The Ca ion has a +2 charge, that is balanced by two -1 charges of the chlorides.
  9. RQ11:
    Suppose an oxygen atom gains two electrons to become an oxygen ion. What is the electric charge?
    The charge is -2
  10. RQ13:
    Do metals more readily gain or lose electrons?
    Metals more readily lose electrons.
  11. RQ14:
    What is an alloy?
    An alloy is a mixture composed of two or more metallic elements.
  12. Exercises 1:
    How is the number of unpaired valence electrons in an atom related to the number of bonds that the atom can form?
    The number of unpaired valence electrons in an atom is the same as the number of bonds that the atom can form.
  13. Ex 2:
    Why does the fluorine atom tend to gain only one electron?
    Flourine only has room for onemore electron in its outermost shell.
  14. Ex 3:
    An atom loses an electron to another atom. Is this an example of a physical or chemical change?
    This is an examle of a chemical change involving the formation of ions which are uiquely different from the neutral atoms from which they are made.
  15. Ex 4:
    Magnesium ions carry a +2 charge and chloride ions carry a -1 charge. What is the chemical formula for the ionic compound magnesium chloride?
    MgCl2
  16. Ex5:
    Barium ions carry a +2 charge, and nitrogen ions carry a -3 charge. What is the chemical formula for the ionic compound barium nitride?
    Ba3N2
  17. Ex 9:
    Which should be larger, the potassium atom, K, or the potassium ion, K+?
    The potassium atom with an additional shell of electrons is larger.
  18. EX 13:
    What happens when hydrogen's electron gets close to the valence shell of a fluorine atom?
    Hydrogen's electron joins the valence shell of the fluorine atom. Meanwhile fluorine's unpaired valence electron joins the shell of hydrogen.

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