1. How many grams of Cl2 can be prepared from the reaction of ...

6. Which of the following contains the greatest number of atoms?A. 100 g of Pb MW = 207, so this is ~ ½ mol.B. 2.0 mole of Ar this is 2 mol.C. 0.1 mole of Fe this is 0.1 mol.D. 5 g of He MW = 4, so this is ~ 1¼ mol.E. 20 million O 2 molecules this is a tiny fraction of a mole7. How many atoms are there in 1.00 ng of magnesium? (1 g = 1 x 10 9 ng)A. 4.11 x 10 -11 atomsB. 2.48 x 10 13 atomsC. 6.83 x 10 -35 atomsD. 6.02 x 10 14 atomsE. 1.46 x 10 34 atoms91.0 x10g 1mol.Mg 6.02 x10atoms1.00 ng x x x= 2.48 x101ng 24.3 g Mg 1mol.2313atoms8. What is the coefficient of H 2 O when the following equation is properly balanced with smallest set of whole numbers?_1_ Al 4 C 3 + _12_ H 2 O → _4_ Al(OH) 3 + _3_ CH 4A. 3B. 4C. 6D. 12E. 249. How many moles of oxygen atoms are contained in 10 moles of KClO 3 (potassium chlorate)?A. 3 molB. 3.3 molC. 10 molD. 30 molE. 6.02 x 10 24 mol10 mol. KClO3 mol. Ox1mol. KClO3 =330 mol. O10. Identify the major ionic species present in an aqueous solution of Na 2 CO 3 .A. Na 2 + CO 32-B. Na 2 + , C 2- O 3C. Na + , C 4+ , O 32-D. Na + , C + , O 2-E. Na + , CO 32-11. The distinguishing characteristic of all electrolyte solutions is that theyA. contain molecules.B. conduct electricity. (that is why it is called electrolyte)C. react with other solutions.D. always contain acids.E. conduct heat.

12. In accordance with the solubility rules, which of the following is true when solutions containing about 0.1 g ofPb(NO 3 ) 2 (aq) and 100 mL of 0.200 M KI(aq) are mixed?Pb(NO 3 ) 2 (aq) + 2KI(aq) → PbI 2 (s) + 2KNO 3 (aq)A. KNO 3 will precipitate; Pb 2+ and I - are spectator ions.B. No precipitate will form.C. Pb(NO 3 ) 2 will precipitate; K + and I - are spectator ions.D. PbI 2 will precipitate; K + and NO - 3 are spectator ions.E. Pb 2+ and I - are spectator ions, and PbI 2 will precipitate.13. In accordance with the solubility rules, which of the following is true when solutions of CuSO 4 (aq) and BaCl 2 (aq) aremixed?CuSO 4 (aq) + BaCl 2 (aq) → CuCl 2 (aq) + BaSO 4 (s)A. CuCl 2 will precipitate, and Ba 2+ and SO 2- 4 are spectator ions.B. CuSO 4 will precipitate, and Ba 2+ and Cl - are spectator ions.C. BaSO 4 will precipitate, and Cu 2+ and Cl - are spectator ions.D. BaCl 2 will precipitate, and Cu 2+ and SO 2- 4 are spectator ions.E. No precipitate will form.14. The common constituent in all acid solutions isA. H 2B. H + This is the Bronsted definition of an acidC. OH -D. H 2 SO 4E. Cl -15. Which is the chemical formula of the salt produced by neutralization of nitric acid with calcium hydroxide?2HNO 3 + Ca(OH) 2 → Ca(NO 3 ) 2 + H 2 OA. CaNO 3B. Ca 2 (NO 2 ) 3C. Ca(NO 2 ) 2D. Ca 2 NO 3E. Ca(NO 3 ) 216. The oxidation number of S in K 2 SO 4 isA. +6B. +4C. +2D. -1E. none of them(2 x K) + S + (4 x O) = 0(2 x +1) + S + (4 x -2) = 0S = 617. The oxidation number of Fe in K 3 Fe(CN) 6 isA. +3B. +2C. +1D. -3E. -4(3 x K) + Fe + (6 x CN - ) = 0 (it is important to recall that CN has a -1 charge)(3 x +1) + Fe + (6 x -1) = 0Fe = 3

18. Which one of the following is a redox reaction?A. H + (aq) + OH - (aq) → H 2 O(l)B. 2KBr(aq) + Pb(NO 3 ) 2 (aq) → 2KNO 3 (aq) + PbBr 2 (s)C. CaBr 2 (aq) + H 2 SO 4 (aq) → CaSO 4 (s) + 2HBr(g)D. 2Al(s) + 3H 2 SO 4 (aq) → Al 2 (SO 4 ) 3 (aq) + 3H 2 (g) Al 0 → Al 3+ and H + → H 0E. CO 2- 3 + HSO - 4 → HCO - 2-3 + SO 419. In the following reaction the oxidizing agent is5S + 6KNO 3 + 2CaCO 3 → 3K 2 SO 4 + 2CaSO 4 + CO 2 + 3N 2A. S S 0 → S 6+ S is oxidized, thus it is the reducing agentB. N 2 N 2 is a productC. KNO 3 N 5+ → N 0 N is reduced, thus the KNO 3 must be the oxidizing agentD. CaSO 4E. CaCO 320. What element is oxidized in the following reaction?Cd + NiO 2 + 2H 2 O → Cd(OH) 2 + Ni(OH) 2A. Cd Cd 0 → Cd 2+B. NiC. OD. H21. When 0.860 g of an organic compound containing C, H, and O was burned completely in oxygen, 1.64 g of CO 2 and1.01 g of H 2 O were produced. What is the empirical formula of the compound?1mol.CO 2 1mol. C0.0373 mol.A. CHOC : 1.64 g CO 2 xx = 0.0373 mol. C= 2 mol.C44.0 g CO 2 1mol.CO 20.0189 mol.B. CH 2 OC. C 2 H 4 O1mol. H 2O2 mol. H0.111mol.H : 1.01g H 2 O x x= 0.111mol. H= 6 mol. HD. C 2 H 6 O18.0 g H 2O1mol. H 2O0.0189 mol.E. C 3 H 6 O 2 ⎛1mol.C ⎞ ⎛1mol.H ⎞O : 0.860 g sample -⎜0.0373 mol.C x - 0.111mol.H = 0.302 g O12.0 g C⎟⎜x1.01g H⎟⎝⎠ ⎝⎠1mol.O0.0189 mol.O : 0.302 g O x = 0.0189 mol.O= 1mol. O16.0 g O0.0189 mol.Thus C 2 H 6 O22. What is the mass percent of Cu in 10 g CuSO 4 ?A. 0.398%B. 1.51%C. 2.51%D. 39.8%E. 66.1%g Cu63.5 gx100%=x100%= 39.8 %g Cu + g S + g O 63.5 g + 32.1g + 4(16.0) g