Number of Electrons in Hydrotelluric Acid Questions

Name: ____________________________________________________

This is an open book examination, you may use your text and notes. There are 10 problems and the total exam is worth 300 points. Make certain that you show all your work on the exam. You may use the reverse side of each page if necessary; if you use scratch paper, be sure to staple it to the exam. I will give partial credit for your work that would lead to a correct solution. However, if you are pointed in the completely wrong direction, you will not receive any partial credit. You have until 4:00 PM on 10/31/20 to complete the exam and an additional 30 minutes to scan and email a copy in .pdf format back to me. You are not to discuss any problem or solution with anyone. If you have any questions, then please email me and I will respond as quickly as possible.

By my signature below, I certify that I have not given nor received any assistance from or to any person on this exam. I also certify that I have fully complied with the closed book requirements listed above.

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  1. When hydrotelluric acid is added into a solution of antimony (III) nitrate, a black precipitate of antimony (III) telluride is formed. First, write an unbalanced equation for this double displacement reaction and then balance it.














  1. Identify the ion, the number of protons, the number of electrons, and give the IUPAC name.
    1. 42 ? +6






    1. 34 ? -2







    1. 51 ? -3




  1. Write the correct chemical formula for the following compounds, and identify as Type I, II, or III: A. Pentaboron pentahydride






    1. Magnesium phosphate






    1. Manganese (IV) peroxide






    1. Platinum (I) hydrogen carbonate






  1. 23.985045 AMU is the mass of one of the three isotopes of magnesium equaling 78.99%. The other two isotopes have a masses of 24.985839 AMU and 25.982595 AMU. If the average atomic mass of magnesium is 24.30506 AMU, what are the % of Mg25 and Mg26?














  1. The formula for the hexacyanocobaltate (II) ion is Co(CN)6-4. Write the formulas for and name the compounds formed from the hexacyanocobaltate (II) ion and cations formed from elements having Z numbers of: 19, 22, 49, and 56.

























  1. Write the correct formulas and balance the equations:
    1. Gallium plus perchloric acid yields gallium perchlorate plus water plus dichlorine pentoxide. (Note: the coefficient of the water is 9 and the coefficient of dichlorine pentoxide is 3.)












    1. Aluminum hydroxide plus sulfuric acid yields aluminum sulfate plus water


















  1. Find a set of coefficients that balance the following equation: C32 H64O7 + O2 —–> CO + H2CO3






















  1. Balance the following equation:

V + HNO3 —–> V(NO3)3 + N2 + H2O


































  1. Write the correct chemical formulas and balance the following equations:
    1. Potassium sulfate plus barium phosphate yields barium sulfate plus potassium phosphate.





    1. Zinc selenide plus hydrogen cyanide yields zinc cyanide plus hydroselenic acid















  1. Sort the following atoms or ions into isoelectronic groups: N-3, Ar, F-1, Ne, P-3, Ca+2, Al+3, Sr+2, Na+1, S-2, Cl-1, O-2, K+1, Mg+2.








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