## Formulas and Equations

1. ____ The formula for sodium iodide is a) Na2I b) NaI c) Na2I2 d) NaI2
2. ____ The formula barium bisulfite is a) BaHSO3 b) Ba(HSO3)2 c) BaH(SO3)2 d) Ba2HSO3
3. ____ The sodium atom contains 11 protons, 12 neutrons, and 11 electons. The sodium ion consists of a) 12 protons, 11 neutrons, and 11 electrons b) 11 protons, 12 neutrons, and 12 electrons c) 12 protons, 12 neutrons, and 11 electrons d) 11 protons, 12 neutrons, and 10 electrons
4. ____ The formula for barium phosphate is a) Ba3(PO4)2 b) BaPO4 c) Ba2(PO4)3 d) Ba3PO4
5. ____ The formula for cupric hydroxide is a) Cu2OH b) Cu2(OH)2 c) CuOH d) Cu(OH)2
6. ____ An element that is in group VIA of the periodic table usually has an oxidation number of a) +6 b) -2 c) -6 d) +2
7. ____ The formula for potassium dichromate is K2Cr2O7. The oxidation number of the dichromate ion is a) +2 b) -2 c) +4 d) -4
8. ____ The number of atoms of hydrogen represented by the expression 8BaC2H3O2 is a) 8 b) 16 c) 24 d) 3
9. ____ The total number of molecules represented by the expression 7Ca(HSO3)2 is a) 7 b) 21 c) 49 d) 77
10. ____ In the equation 2KClO3 2KCl + 3O2, KCl is the a) coefficient b) catalyst c) reactant d) product
11. ____ The molecular weight of ammonia (NH3) is a) 15 b) 17 c) 45 d)48
12. ____ The formula weight for potassium sulfate (K2SO4) is a)87 b) 158 c) 174 d) 270
13. ____ The formula weight of Ba(OH)2 . 8H2O is a) 315 b) 203 c) 171 d) 144
14. ____ When a chemist states that the weight of bromine is 159.818 grams he is referring to its a) atomic weight b) molecular weight c) gram atomic weight d) gram molecular weight
15. ____ In the equation Zn + 2HCl ZnCl2 + H2, the equation weight of hydrochloric acid is a) 36.5 b) 36.5 grams c) 73 d) 73 grams
16. ____ In the expression 4AlCl3, the subscript of aluminum (Al) is a) 1 b) 3 c) 4 d) 12
17. ____ The gram formula weight of AlCl3 is a) 62.5 b) 62.5 grams c) 133.5 d) 133.5 grams
18. ____ 4Fe + 3O2 2Fe2O3 represents a) a chemical formula b) a balanced equation c) chemical equilibrium d) a phase change
19. ____ The number of grams of carbon dioxide constituting one gram-formula weight is a) 1 b) 28 c) 44 d) 6.023 X 1023
20. ____ The molecular formula H2O represents all of the following except a) one molecule of water b) the relative number of atoms in a molecule c) one formula weight of water d) one gram of water
21. ____ The total number of atoms of oxygen represented in the expression 3H2SO4 is a) 12 b)7 c) 3 c) 4
22. ____ All of the following are chemical changes except the a) souring of milk b) solution of sugar in water c) rusting of iron d) tarnishing of silver
23. ____ The valence electrons of the atom are the electrons found in the a) incomplete inner shell b) nucleus c) incomplete outer shell d) kernel
24. ____ The valence of a single atom of chlorine is a) 0 b) 1 c) 17 d) 7
25. ____ The number of neutrons in an atom whose atomic number is 4 and whose atomic mass is 9 is a) 4 b) 13 c) 9 d) 5