CHEMICAL FORMULAS and COMPOUNDS PRACTICE TEST

Nomenclature and Mole Applications 14. nitrous acid Practice Test #2 a) HNO2 b) H3N c) HNO3 d) HNO4

1. NaClO 15. Ag2S a) sodium chloride b) sodium chlorate a) silver sulfide b) disilver sulfide c) sodium chlorite d) sodium hypochlorite c) silver sulfite d) silver sulfate

2. phosphoric acid 16. KMnO4

a) HPO4 b) H3PO4 c) H3PO3 d) HPO3 a) potassium manganate b) potassium permanganate

3. FeCrO4 c) potassium manganite a) iron chromate b) iron (III) chromate d) potassium hypomanganite c) iron (II) chromate d) iron (I) chromate 17. P2O5 4. mercury (II) phosphate a) phosphorous oxide

a) Mg3(PO4)2 b) HgPO4 b) diphosphorous pentoxide c) Hg3PO4 d) Hg3(PO4)2 c) potassium oxide d) phosphorous pentoxide 5. cadmium (II) bromate

a) Cd(BrO3)2 b) CdBrO3 18. gold (I) dichromate c) Cd2(BrO3)2 d) Cd2BrO3 a) Au(CrO4)2 b) Au(Cr2O7)2 c) Au2Cr2O7 d) AuCr2O7 6. potassium hydrogen sulfate

a) K2HSO4 b) KHSO3 19. sodium cyanide c) KHSO4 d) K2HSO3 a) SCN b) Na(CN)2 c) Na4C d) NaCN

7. SnCl4 a) tin chloride b) tin (II) chloride 20. SO3 c) tin (IV) chloride d) tin (IV) chlorate a) sulfate b) sulfite c) sulfur trioxide d) sulfur (III) oxide

8. Pb(ClO4)2 a) lead (IV) chlorate b) lead (IV) perchlorate 21. What is the ionic charge on the vanadium ion in c) lead (II) chlorate d) lead (II) perchlorate the ionic compound V2O5? a) + 2 b) − 2 c) − 5 d) + 5

9. H2S a) sulfuric acid b) sulfurous acid 22. cobalt (II) chloride c) hydrosulfuric acid d) hydrosulfurous acid a) CoCl2 b) Co2Cl c) Co(ClO3)2 d) Co(ClO2)2

10. AlH3 a) aluminum hydroxide b) aluminum trihydride 23. gold (III) nitrate c) aluminum hydride d) aluminum acetate a) AuNO3 b) Au(NO3)2 c) Au(NO3)3 d) Au(NO3)4

11. H2CO3 a) hydrocarbonic acid b) carbonous acid 24. Cr(OH)3 c) carbonic acid d) hydrogen carbide a) chromium (III) hydride b) chromium (III) hydroxide 12. ZnO c) chromium (II) hydride a) zinc peroxide b) zinc oxide d) chromium (II) hydroxide c) zinc (II) oxide d) zinc oxygen 25. copper (II) iodate 13. carbon disulfide a) CuI b) CuI2 c) CuIO3 d) Cu(IO3)2

a) CS2 b) C2S4 c) C2(S2)4 d) C2S

Nomenclature and Mole Applications Practice Test #2 page 1 26. tin (II) thiocyanate 41. What is gram-molecular mass of Hg3AsO4? a) Sn(SCN)2 b) Sn(SCN)4 c) Sn(SCN)3 d) SnSCN 42) 2.09 moles of HClO4 _____ molecules.

27. iron (III) acetate 43) 2.7 x 1022 molecules of ZnO equals _____ moles.

a) FeC3H2O3 b) Fe2(C2H3O2)3 c) FeC2H3O2 d) Fe(C2H3O2)3 44. What is the percent of nitrogen in Al(NO3)3?

28. copper (I) cyanide 45. What is the percent of oxygen in Sn(IO3)2? a) CuCN b) Cu(CN)2 c) Cu2CN d) CuH 46. What is the empirical formula of a compound based on the following percentages: 29. nickel (II) acetate 58.5 % carbon, 7.39 % H, 34.1 % N

a) NiC3H2O3 b) Ni(C3H2O3)2 24 c) NiC2H3O2 d) Ni(C2H3O2)2 47. ______moles of SO3 = 2.4 x 10 molecules

30. mercury (I) hypochlorite 48. What is the mass of 0.40 mol of C9H8O4? a) Hg(ClO2)2 b) HgClO2 c) Hg(ClO)2 d) HgClO 49. What is the percent water in the following hydrate: Na2SO4·10H2O. 31. PbSO3 a) lead (IV) sulfate b) lead (IV) sulfite 50. An unknown compound has an empirical formula

c) lead (II) sulfate d) lead (II) sulfite of C3H6O2 and a molecular mass of 222.3 g/mol. What is the molecular formula of this compound?

32. Rb2Cr2O7 a) rubidium oxalate b) rubidium chromate 51. Bicarbonate of soda (sodium hydrogen carbonate) c) rubidium acetate d) rubidium dichromate is used in many commercial preparations. Its formula

is NaHCO3. Find the mass percentages (mass %) of 33. Cl2O7 sodium in sodium hydrogen carbonate. a) chlorine oxide b) dichlorine oxide

c) dichlorine heptoxide d) chlorine heptoxide 52. What is the empirical formula of Na2SO4?

34. HF 53. Find the empirical formula for the following a) fluoric acid b) fluorous acid substance, where the percentage composition is given: c) hydrofluorous acid d) hydrofluoric acid 88.8% copper, 11.2% oxygen. 35. What is the empirical formula of a compound with a molecular formula of C3H12? 54. The simplest formula for a compound is C3H4O3. a) C3H12 b) CH c) CH4 d) C4H Experimental data indicates that the molecular mass is about 180. What is the compound’s molecular Show work for the following questions. formula?

36. A compound has the empirical formula C2H3O and gram formula mass of 172 g. What is its ANSWERS molecular formula? 36) C8H12O4 37) 323.2 g/mol 38) 0.50 39) 247.9 g/mol 40) 4.87 x 1023 24 37. What is the molar mass of PbCrO4? 41) 740.7 g/mol 42) 1.26 x 10 43) 0.045 44) 19.7 % 45) 20.5 % 46) C2H3N 38) 56 grams of FeF3 are _____ moles. 47) 4.0 48) 72 g 49) 55.9 % 50) C9H18O6 51) 27.4 % 52) Na2SO4 39. What is the molar mass of Ag2S? 53) Cu2O 54) C6H8O6

40) 212 g of Na2Cr2O7 equals ____ molecules.

Nomenclature and Mole Applications Practice Test #2 page 2