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5.2: Unit 5 Practice Problems

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    Question 1.

    Given that the following reactions occur, rank the elements Li, K, Ca, and Ba in an activity series from highest activity to lowest.  

    2K + BaCl2 → 2KCl + Ba

    Li + KCl → LiCl + K

    Ba + CaCl2 → 2BaCl + Ca

    Answer

    Li, K, Ba, Ca

    Question 2. 

    Write the balanced chemical equations for the following reactions and then rank the metals in an activity series from highest to lowest.  

    • magnesium metal reacts with zinc (II) nitrate to form magnesium nitrate and zinc metal.
    • zinc metal reacts with iron (III) nitrate to form zinc (II) nitrate and iron metal.  
    • iron metal reacts with cobalt (II) nitrate to form iron (III) nitrate and cobalt metal.  
    Answer

    Mg + Zn(NO3)2 → Mg(NO3)2 + Zn

    3Zn + 2Fe(NO3)3 → 3Zn(NO3)2 + 2Fe

    2Fe + 3Co(NO3)2 → 2Fe(NO3)3 + 3Co

    Mg, Zn, Fe, Co

     Question 3.

    Write the balanced chemical equations for the following reactions and indicate which metals are more active than hydrogen.  

    • magnesium reacts with HCl to form magnesium chloride and H2 gas. 
    • gallium reacts with HCl to form gallium chloride and H2 gas. 
    • Sr reacts with nitric acid (HNO3) to form strontium nitrate and H2 gas. 
    • Hg does not react with nitric acid.  
    Answer

    Mg + 2HCl → MgCl2 + H2

    2Ga + 6HCl → 2GaCl3 + 3H2

    Sr + 2HNO3→ Sr(NO3)2 + H2

    Hg + HNO3→  No reaction

    Mg, Ga, and Sr are more active than hydrogen and Hg is less active.  

    5.2: Unit 5 Practice Problems is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.

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