- 6 Part I Multiple Choice Choose The Best Answer And Write It On The Line 1 2 Pts Which Of The Following Substances 1 (47.44 KiB) Viewed 46 times
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- 6 Part I Multiple Choice Choose The Best Answer And Write It On The Line 1 2 Pts Which Of The Following Substances 3 (39.61 KiB) Viewed 46 times
- 6 Part I Multiple Choice Choose The Best Answer And Write It On The Line 1 2 Pts Which Of The Following Substances 4 (35.5 KiB) Viewed 46 times
- 6 Part I Multiple Choice Choose The Best Answer And Write It On The Line 1 2 Pts Which Of The Following Substances 5 (35.14 KiB) Viewed 46 times
6 Part I. Multiple Choice. Choose the best answer and write it on the line. 1. (2 pts) Which of the following substances is a strong electrolyte when mixed with water? D. CH₁206(aq) Answer A. NH₂(aq) werk B. CH₂COOH(aq) C. KCIO,(aq) week 2. (2 pts) How many moles of hydroxide ions are released when 0.80 moles of barium hydroxide are dissolved in water? A. 0.40 mol B. 0.80 mol C. 1.20 mol Answer D. 1.60 mol 3. (2 pts) Select the classification for the following reaction: 2 H₂O(1) + O2(g) → 2 H₂O₂ (g) 2 A. Combination B. Single Displacement C. Neutralization Answer 4. (2 pts) Predict the products for the following reaction: Ca(NO3)₂(aq) + Zn(s) → XZn(NO₂)2 + Ca(NO3)2 B. Zn(NO₂)₂ C. Zn(NO₂)₂+ Ca D. The reaction does not occur. Answer 5. (2 pts) A flask containing neon gas is connected to an open-ended mercury manometer. The open end is exposed to the atmosphere, where the prevailing pressure is 745 torr. The mercury level in the open arm is 50. mm below that in the arm connected to the flask (see picture below). What is the pressure of the gas in the flask? A. 50 torr B. 695 torr C. 745 torr D. 795 torr Answer Pr=nRT IL 6. (2 pts) "The volume of an ideal gas is directly proportional to its absolute temperature at constant pressure and number of moles" is a statement of Law. v. 201₂ A. Avogadro's B. Boyle's C. Charles's D. Dalton's Answer 27. (2 pts) When equal moles of O₂ and Ne are mixed, which gas effuses last at 25°C? A. 0₂ B. Ne C. Both gases effuse at equal rates. A+P₂+13 Answer A
NN 2 Mrms M ky 8. Given the gases shown below, select the best answer for the following two questions. B. Ne D. All three gases have the same value at 25°C. A. NH, C. CO L. (2 pts) Which gas has the greatest root-mean-square speed at 25°C? ii. (2 pts) Which gas has the greatest average kinetic energy at 25°C7 Answer Answer 9. (2 pts) The ideal gas law tends to become inaccurate when A. the pressure is lowered and molecular interactions become significant. B. the temperature is raised above the temperature of STP. C. the volume expands beyond the standard molar volume. D. the pressure is raised and the temperature is lowered. Answer Part II. Fill in the Blanks. 10. (2 pts) The graph below shows the distribution of molecular speed for five different gases at the same temperature. PV = nRT PM=dRT d = PM RT M Which gas has the largest density? Answer 11. (10 pts) Predict the products of the following reaction. Write complete, balanced molecular, total ionic and net ionic equations on the lines as indicated. Include states of matter! - (NH₂)₂S (aq) + Al(CIO), (aq) → DS © NHA (COA) + AIS (5) (6 pts) Molecular Equations NHA (C/O₂) + Ats (5) Subscripts (2 pts) Total Ionic Equation: ? NHÃ i slot dep Nhat Di Asen Al-Clo₂1 •NH₂-Olas AISCA + A (2 pts) Net lonic Equation: 2_AR() + 5 cay = Al Scal 2 2 O mama jo amputa ana 3RT with X = 2731 25 = 298 K
12. (8 pts total) Write the net ionic equation for the following two reactions on the line. Include states of matter! a) HF (aq) + CsOH (aq) → 4- (4 pts) Net Ionic Equation: CsE(S) + H₂0 (1) b) HNO, (aq) + LiOH(aq) (4 pts) Net Ionic Equation: 2 Li (Nests + H₂0 (0) 13. (12 pts total) Assign oxidation numbers to each element in the following equation by writing the number on the line above each element. Then answer the questions below. (8 pts) Ox. #s: 22 AA 2 POBr3 (s) + 3 Cu(s) → 2 PO(s) + 3CuBr₂ (s) (2 pt) Which element was oxidized? (2 pts) Which substance is the reducing agent? Oil Rig Part III. Problem Solving. Show all work including conversions and units. Answers should include correct sig. figs. Put your answers in the boxes. 14. (5 pts) Suppose a chemist wants to prepare 750.0 mL of a 0.825 M solution of calcium chloride. What volume (in mL) of a 2.35 M calcium chloride stock solution must be diluted Ca Cls with water? 750ML XLL = 0.130 L 1000 m of COCK 0.825 M Ch₂ Imal of CCs * AL 145 /mnd/ 2.35 Mx (0,002267) 40+3х35 = 0.004267 mal 10.02mL = 0.0100 L X 1000 ML
only. n= 15. (22 pts total) SHOW ALL WORK! Put your answers in the boxes Consider the reaction: FeS(s) + 2 HCl(aq) → FeCl, (s) + H₂S (g) a) (11 pts) If 65.0 g FeS reacts with 872 ml. of 1.35 M HCl, what is the limiting reactant and the theoretical yield, in grams, of H₂S? 65.g #0546 ml Fes x Imala Fesz 119./md Fes to mal 872 4-0,645 mnd 1 L = 0.645 md HCl, = .3225 mnd HCI -12 1,35 Hel< FeS3) Which reactant is the limiting reactant? HCI What is the theoretical yield, in grams, of H₂S7 0.3225 59.06% X100 3.546 b) (11 pts) If 15.3 L of H₂S is collected in the lab (where the pressure is measured at 726 torr and a temperature of 95 °C), what is the percent yield of the reaction? K = 273 +95 = 368 726 Jorr =1.455 dlm 160 to PV=nRT V=IS.3L 24 PV (0)/15.3) n= (9821) (368) = 0.431 mel X 100 = 67.03% H 55.8+ 2(32) = Fe S(x) 0.3225 mel 2.481 mel = 0.546mal 67,03% X
16. (8 pts) A sample of helium gas occupies a volume of 3.25 L at 722 mmHg and 41.0 °C. Find its volume (in L) at STP. V=3.25 L 722 mmilly * lem 760 mmily T= 273+ 41 = 314 k ✓ 3.25L Imel of He 0.1450 met Hof 22.4L PV=nRT V = nRT₂ (0.1450) (0282₁) (314) = 3.94 3.44 L (0.95) 17. (8 pts) A mixture of noble gases is used to prevent chemicals from reacting with oxygen in air. The mixture contained 8.50 g He, 17.0 g Ne and 48.0 g Kr. What is the partial pressure of Kr gas when this mixture is delivered at a total pressure of 1.49 atm? 8.5g He x Imel He (1007) = 844 174 of Nex Imel Ne 2018 48 g of Kr x 1 mal Kr 3.575 fueil +1 83.0 g/mal 0.575 (8.44) 644 856 S (8.44)575) (0.84) 1/+19,35 85.6% 18. (5 pts) If it takes 2.50 min for 0.020 mol of He gas to effuse, how long will it take for the same amount of N₂ gas to effuse? N₂ = 28 gimel 2.50 mill 1,307 tz 180 Date of Hex Immet He 250min=₂ Not He 0,02 of M₂ x Imel ay 0.47 mim 0.18 t₂ = 13,23 min V100 58 0,47 min