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.*

Signature: ______________________________________________________________

- 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.

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

- 34 ? -2

_{51}?^{-3}

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

- Magnesium phosphate

- Manganese (IV) peroxide

- Platinum (I) hydrogen carbonate

- 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 Mg
^{25}and Mg^{26}?

- 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.

- Write the correct formulas and balance the equations:
- 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.)

- Aluminum hydroxide plus sulfuric acid yields aluminum sulfate plus water

- Find a set of coefficients that balance the following equation: C
_{32 }H_{64}O_{7}+ O_{2}—–> CO + H_{2}CO_{3}

- Balance the following equation:

V + HNO_{3} —–> V(NO_{3})_{3} + N_{2} + H_{2}O

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

- Zinc selenide plus hydrogen cyanide yields zinc cyanide plus hydroselenic acid

- 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.