Chemical Formula Questions

CHEMICAL FORMULA QUESTIONS

1. a. Write the symbol for an ion (remember ions have a charge) of each of the following: potassium, nitrogen, aluminum, oxygen, calcium, chlorine. b. Write the formulas for calcium chloride, calcium nitride, aluminum oxide, potassium chloride, potassium oxide, and aluminum nitride.

2. Write the formulas of the following compounds. a. potassium sulfide d. barium chlorate b. magnesium carbonate e. cobolt (III) fluoride c. calcium phosphate f. sodium cyanide

3. Name the following chemicals. a. Cu2S c. Al2(CrO4)3 b. Hg(NO3)2 d. Sr(OH)2

4. Name the following compound using both the new and traditional system names. a. NO3 b. CO c. N2O3 d. SiO2 e. P4O10

5. Write the formulas of the following compounds. a. nitrogen (II) oxide (skip) d. phosphorous trichloride b. sulfur hexafluoride e. oxygen (II) fluoride (skip) c. xenon tetroxide

6. Write the chemical formulas for each of the following acids. a. hydrochloric d. sulfuric b. chlorous e. hydrosulfuric c. hypochlorous

7. A student writes the formula for barium selenide as BASE. Is this formula correct? Explain.

8. The compound calcium hydroxide is composed of Ca2+ and OH1- ions. A student writes the formula as CaOH2. Is this formula written correctly? Why or why not?

9. A student is asked to count the number of atoms in a formula. For the formula Ba3(PO4)2 she writes that the number of atoms is 9. Is this correct? Explain.

10. Assume chlorine always forms the same ion in other compounds as it does in sodium chloride. Which of the following could be formulas of ionic compounds? (R, X, and Z are any three different elements.) a. R2Cl3 b. X2Cl c. ZCl

(OVER) Extra Credit You can use the periodic table to expand your ability to name polyatomic ions and acids. Examine the periodic table as it relates to your polyatomic ion chart. Remember that elements in the same family have similar chemical properties. Use these two references to answer the following questions:

2- 1- 11. Consider the ions SeO4 and IO3 a. What are the names of these ions? b. What are the formulas for the compounds formed from aluminum and these ions? c. What are the names of the compounds in part b? 1- d. If the ion IO2 existed, what would be its name? e. Write the formulas of the acid formed from these ions. f. What are the names of the acids from part e?