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Chemistry LibreTexts

Module 4 Practice

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    278644
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    Exercise \(\PageIndex{1}\)

    Name the compound below.  Hint: Is it ionic or covalent?  Is the cation predictable or variable?

    CuCN

    Hint

    It is ionic.  It is variable, so you must determine the charge needed to make a total of zero charge. Roman numeral is needed.

    Answer

    copper (I) cyanide

    Exercise \(\PageIndex{1}\)

    Name the compound below.  Hint: Is it ionic or covalent?  Is the cation predictable or variable?

    PCl5

    Hint

    It is covalent.  There is no cation.  Use prefixes to tell how many of each element are in the formula.

    Answer

    phosphorus pentachloride

    Exercise \(\PageIndex{1}\)

    Add exercises text here.

    Hint

    It is covalent.  There is no cation.  Use prefixes to tell how many of each element are in the formula.

    Answer

    Add texts here. Do not delete this text first.

    Exercise \(\PageIndex{1}\)

    Add exercises text here.

    Hint

    It is covalent.  There is no cation.  Use prefixes to tell how many of each element are in the formula.

    Answer

    Add texts here. Do not delete this text first.

     

     

     

    Exercise \(\PageIndex{1}\)

              K                Ca

              Rb              Sr

    Out of the four elements listed above, choose the one that has

    j)  the largest radius

    k)  the least ionization energy

    l)  the most metallic character

    Answer j

    Rb

    Answer k

    Rb

    Answer l

    Rb

    Exercise \(\PageIndex{1}\)

    The element chlorine is found in nature as a mixture of 35Cl and 37Cl.  Given that the average atomic mass of chlorine is 35.45 amu, which isotope is more abundant?

    Answer

    35Cl is more abundant.  Since the average mass is closer to 35 amu, you have more of the isotope with a mass of 35 amu than you do of the isotope with a mass of 37 amu.

    Exercise \(\PageIndex{1}\)

    If there were chemists on another planet, their periodic table might be different because the elements might have different "natural" abundances.  If on the other planet, the element sulfur had the following natural abundances, calculate the average atomic mass that the chemists on that planet would use.

    68.44 % is 32S with mass of 31.9721 amu

    23.24 % is 33S with mass of 32.9715 amu

    8.32 % is 34S with mass of 33.9679 amu

    Answer

    Add up (uncertain digits are underlined):

    21.8817amu

      7.6626 amu

      2.8261 amu

    Total is 32.3704 amu which rounds to 32.37 amu

    Exercise \(\PageIndex{1}\)

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    Answer

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