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Elements in the same group of the periodic table often form oxyanions with the same general formula. The anions are also named in a similar fashion. Based on these observations, suggest a chemical formula or name, as appropriate, for each of the following ions: (a) BrO4-, (b) SeO32-, (c) arsenate ion, (d) hydrogen tellurate ion.

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Deanna Hettinger
Deanna HettingerLv2
22 May 2020

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Related questions

The nitrate ion, NO3-, is in a separate group from the anions used in today’s experiment. The groups are listed below. Suggest a reason why the procedure used today would make the determination of the nitrate ion difficult.

1. Group I: the sulfate group. This group is named the same as the sulfate ion but it also contains other –ate ions, like carbonate (CO32–) and phosphate (PO43–). These anions selectively react with Ba2+ cation (or other alkaline earth metal cations like Ca2+) under basic conditions (eg. ammonia solution) and generate precipitations. The reaction can be either reversible or irreversible depends on the chemical property of the precipitation.

2. Group II: the halide group. This group includes or the halides and sulfide (S2–). These anions can react with Ag+ cation under acidic or neutral conditions. The reaction usually generates very insoluble and chemically stable precipitation.

3. Group III: the nitrate group. The nitrate (NO3–) anion forms water soluble salt with all the common cations.

5. Decide whether the following elements a metal, nonmetal, or metalloid.

Se b. Cs c. Fe d. Cu e. Br f. Cl g. Si

6. Identify group and period for each of the following by referring to the periodic table. Also,

label each as metal, nonmetal or metalloid.

a. C b. Po c. Cr d. Mg e. B

7. Write the formula for the compound of each of the following pairs of ions.

a. Fe3+ and CN- b. K+ and SO42- c. Li+ and N3- d. Ca2+ and P3- e. Cr+3 and O-2 f. Sr+2 and O-2

8. Name the following compounds:

Mg3N2 b. CrSO4 c. CaO d. PbCrO4

9. Write down the chemical formula of the following compounds:

Iron (II) phosphate b. Titanium (IV) oxide c. Thallium (III) nitrate

10. Name the following compounds:

SF4 b. Cl2O7 c. N2O4 d. P4O6 e. PCl3

PCl5 g. Cl2O6

Part F: some functional groups

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