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5.6.1: Practice Nuclear Chemistry

  • Page ID
    236039
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    Exercise \(\PageIndex{1}\)

    What is the missing isotope in the reaction below?  What type of reaction is it?

    \[_{95}^{241}Am \rightarrow  ? + _{2}^{4}He\]

    Answer
    \(_{93}^{237}Np\)  It is alpha emission.

    Exercise \(\PageIndex{1}\)

    What is the missing isotope in the reaction below?  What type of reaction is it?

    \[_{28}^{58}Ni+_{1}^{1}H \rightarrow  ? + _{2}^{4}He\]

    Answer
    \(_{27}^{55}Co\) It is nuclear bombardment.

    Exercise \(\PageIndex{1}\)

    What is the missing isotope in the reaction below?  What type of reaction is it?

    \[_{39}^{90}Y \rightarrow  ? + _{–1}^{0}e\]

    Answer
    \(_{40}^{90}Zr\)  It is beta emission.

    Exercise \(\PageIndex{1}\)

    What is the missing isotope in the reaction below?  What type of reaction is it?

    \[_{54}^{118}Xe \rightarrow  ? + _{+1}^{0}e\]

    Answer
    \(_{53}^{118}I\)  It is positron emission.

    Exercise \(\PageIndex{1}\)

    Two units used to measure absorbed dose of radiation are the rad and the gray (Gy). Their relationship is that 1 Gy = 100 rad, exactly.  If a medical treatment involves the absorption of 0.45 krad, what is that in Gy?

    Answer

    4.5 Gy

    Exercise \(\PageIndex{1}\)

    The units used to measure radioactivity of a sample are curies (Ci) or bequerel (Bq).  Their relationship is that 1 Ci = 3.7 x 1010 Bq (2 sig dig relationship).  If a radioactive sample is giving off 35 nCi, how many Bq is that?.

    Answer

    1300 Bq

    More Chapter 5 Practice

    Exercise \(\PageIndex{1}\)

    What is the missing isotope in the reaction below?  What type of reaction is it?

    \[_{24}^{51}Cr \rightarrow  ? + _{–1}^{0}e\]

    Answer
    \(_{25}^{51}Mn\)  It is beta emission.

    Exercise \(\PageIndex{1}\)

    What is the missing isotope in the reaction below?  What type of reaction is it?

    \[_{18}^{40}Ar+_{2}^{4}He \rightarrow  ? + _{1}^{1}H\]

    Answer
    \(_{19}^{43}K\) It is nuclear bombardment.

    Exercise \(\PageIndex{1}\)

    What is the missing isotope in the reaction below?  What type of reaction is it?

    \[_{84}^{214}Po \rightarrow  ? + _{2}^{4}He\]

    Answer
    \(_{82}^{210}Pb\)  It is alpha emission.

    Exercise \(\PageIndex{1}\)

    What is the missing isotope in the reaction below?  What type of reaction is it?

    \[_{80}^{188}Hg \rightarrow  ? + _{+1}^{0}e\]

    Answer
    \(_{79}^{188}Au\)  It is positron emission.

    Exercise \(\PageIndex{1}\)

    Two units used to measure absorbed dose of radiation are the rad and the gray (Gy). Their relationship is that 1 Gy = 100 rad, exactly.  If a medical treatment involves the absorption of 75 mrad, what is that in Gy?

    Answer

    0.00075 Gy

    Exercise \(\PageIndex{1}\)

    How old (in weeks) is a sample of Ce-141 that has been around for 3.80 half-lives? The half-life of Ce-141 is 32.5 days.

    Answer

    17.6 weeks

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