Identify the compounds as acid, base, salt, metal oxide or molecular formula. (3
ID: 1043355 • Letter: I
Question
Identify the compounds as acid, base, salt, metal oxide or molecular formula. (3 points each) 3. Ga,O, 4. HC2H 0 5. Mg(CIO)s 6. KN Questions 7-15 are multiple choice questions. Choose the best answer. (4 points each) 7, what is the mass, in grams of 6.71 x 10s atoms of CHCOOH. c) 6.69 x 10 d) 66.911 x 104 a) 67 x 104 b) 66.9 x 10 8.The percent yield for the reaction 3 CaCl +2 Na POsCa (PO)2+ 6 NaCi is known to be many grams of CaCl2 will react with an excess of Na POs in order to collect 92. g of Cas(PO)2 a) 98.7 g c) 128 8 b) 98.7 g d) 127.7 g 9. For the reaction 4 Na + 2S-+ 2 Na2S, how many atoms of sulfur will react with 92 a) 92 atoms c) 184 atoms d) 2 atoms b) 46 atoms 10. What is the probable ionic formula for rubidium and selenium? c) Rb Sa3 a) SejRbz d) Rb Sa b) Rb.SeExplanation / Answer
3. Ga2O3 metal oxide
4. CH3COOH acid
5. Mg(ClO3) salt
6.KN3 ( molecular formula
7. moles = 6.71*10^19 / 6.022*10^23 = 1.1 * 10^-4 moles
mass = moles * molecular mass
= 1.1*10^-4 * 60
= 6.7*10^-3 grams (option C)
10. Rb2Se
11. NO3-
12. BOth a and b upto 7 (F) decreases and 8 (Ne) increases
13, ions in aqueous solution
14. strong base
15. mass / molar mass = 14.42 / 137 = 0.105
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