chem 1 exam - Aluminum and oxygen react according to the...

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Unformatted text preview: Aluminum and oxygen react according to the following equation: 4231(5) + 302(g) -* 21312030) In a certain experiment, 4.5 g Al was reacted with excess oxygen. If the product was obtained in 54% yield, how many grams were obtained? 3:332; Value Correct Answer Feedback a. 2.9 0% b. 1.5 0% C. 8.? 0% d. 5.6 100% a e. 55 0% Score: 021 In the Haber process nirtrogen reacts with hydrogen to give ammonia. What is the theoretical yield of ammonia in grams that can be prepared from 41.0 g of nitrogen and excess hydrogen? Student Value Correct Answer Feedback Response a. 41.0 g 0% b. 49.8 g 100% a c. 24.9 g 0% d. 55.5 g 0% e. 53.2 g 0% Calculate the Followmg quantity: Molarity of the solution that results when 24.4 9 silver nitrate is dissolved in enough water to give a final Volume of 685 rnL. (Do not enter the units of your answer) Student Response Value Correct Answer Answer not answered 0% 0.21 Score: 02']. 8. Concentrated sulfuric acid (18.3 M) has a density of 1.84 gln'iL. What is the mass % of H2504 in the solution? Student Value Correct Answer Feedback Response a. 97.5% 100% a b. 98.6% 0% C. 9.8% 0% d. 34.3% 0% e. 33.0% 0% Score: of]. 9. What volume of water must be added to 45.0 n'iL of a 1.0 M solution of H2504 in order to create a 0.33 M H2504 solution? Student Value Correct Answer Feedback . Una nswered ‘/ Answered .Iw oi: Ola \i. oi; ON \IN .Iw .IB \I-h 10. When a solution of 125 mL 0.50 M NaCI is added to a solution of40.0 mL 3.0 M H2504, a reaction ensues to produce hydrochloric acid and sodium sulfate. What is the concentration, in molarity, of sodium sulfate in the final solution? Student Value Correct Answer Feedback Response a. 0.23 100% a b. 0.4-5 0% C. 0.73 0% d. 0.038 0% e. 2.4- 0% Score: 0f1 11. What volume, In milliliters, of 1.15 M KOH is required to neutralize 45.0 mL of 0.764- M I—INO3? Student Value Correct Answer Feedback Response 3. 25.3 0% b. 17.4 0% C. 45.0 0% d. 57.7 0% e. 29.9 100% E Score: 0(1 12. A vat contains 2.73 M hydrochloric acid solution. How many kg of Ca{G‘H)2 will be required to react completely (neutralize) 553 L of the solution? Do not enter units With your answer. Student Response Value Correct Answer Answer not answered 0% 56 Score: 0f1 2. Calcium nitrate and ammonium fluoride react to form calcium fluoride, dinitrogen monoxide, and water vapor. What mass of dinitrogen monoxide is present after 15.0 9 calcium nitrate and 1?.50 g ammonium fluoride react completely? :ggggge Value Correct Answer Feedback a. 4.02 g 0% b. 20.3 g 0% C. 10.4 0% d. 4.59 g 0% e. 3.04 g 100% a Score: 0l1 Calcium reacts with oxygen to make calcium oxide, CaO. What is the maximum mass of CaO{s) that could be prepared from 9.1? g of Ca{s) and 2.72 g of 0209)? Do not type units with your answer. Student Response Value Correct Answer Answer 12.821 0% 9.5 Calculate the following quantity: Number of Cu2+ ions in 21.5 L of 1.42 M copper{II) chloride . Please enter your answer in scientific format: 1.2 x 105 21.235 and use three significant figures. Correc t Answ er 1.84E25 {1.04 x 1025) Student Response not answered Score: 0,’1 9. What would be the molarity of a solution obtained by diluting 125 mL of 5.00 M HCI to 500. mL? Student Value Correct Answer Feedback Response a. 1.25 0% .v'i b. 1.50 100% a C. 0.55? 0% d. 24.0 0% e. 10.4 0% Score: Ill 10. If 150.0 mL of HCI solution are required to react completely with 0.35 mol of solid NaOH, what is the molarity of the HCl solution? 140(an + Nam—1(5) —a- NaCl(aq) + H200) 3:332; Value Correct Answer Feedback a. 15 0% b. 0.35 0% c. 2.3 100% a d. 1.0 0% e. 53 0% 11. If 26.35 mL of a standard 0.1550 M NaOH solution is required to neutralize 35.00 mL of H2504, what is the molarity of the acid solution? ::::::9 Value Correct Answer Feedback a. [1.04894 M 0% H2504 b. 9.9811 M 0% H2504 c. 0.05211 M 100% I H2504 (:1. 0.0022 M 0% H2504 Score: 0/1 12. An auto technician spills 85 mL of 2.6 M H2504 solution from a rebuilt auto battery. How many milliliters of 2.5 M NaHCO3 must be poured on the spill to react completely with the sulfuric acid? Student Value Correct Answer Feedback Response 8- 4.42 x 102 mL 0% Ncho3 b- 1.3 x 102 mL 100% I Ncho3 C-se4x104mL 0% Ncho3 d- 0.3 x 101 mL 0% Nch03 2. Which of the Following compounds is a nonelectrolyte? Student Value Correct Answer Feedback Response 3. CH3COOH 0% {acetic acid) b. NaCI 0% a c. KOH 0% Your choices were: A. CHBCOOH {acetic acid) B. NaCI C. KGH D. C2HEO (ethanol) E.NH3 The correct answer is D. See section 4.1 in your textbook. cl. CEHEO 100% a (ethanol) e.r~iH3 0% Score: 0!1 3. How many total moles of ions are released when the following sample dissolves completely in water? Don't type units. 42LBQ MgSOi2HZO Student Response Value Correct Answer Answer not answered 0% 3.42 Identify all of the products formed when Ba{OH)2{aq) reacts with HNC-3{aq). Student Value Correct Answer Feedback Response a. Ba{l~l03)2{aq) 100% E and H20“) b. BaN2{s) and 0% H2013) N02'{aq) and Hzc-{D d. Ba{s), H2{g) [1% and 0102(9) ~".-i e. Ba{N03)2{s) [1% Your choices were: and H200) 0- Ba{N03)2{aq) and H20“) B. BaN2{s) and H200) c. Ba2+{aq), N02'{aq) and H200) D. Ba{s), H2{g) and 0102(9) E. Ba{N03)2{s) and H20“) The correct answer is A. See section 4.2 in your textbook. Score: Oil What volume, in mL, of 0.23 M HCI neutralizes 1?.2’2 mL of 0.22 M CatOI—Ijg? 3:332; Value Correct Answer Feedback a. 34 100% E b. 9.3 [1% c. 0.02? [1% d. [1.11 [1% e 1? [1% The net ionic equation that describes what happens when solutions of Bowl—[)2 and NaN03 are mixed is: Student Response Value Correct Answer Feedback 8- 092+(aq) + 20H‘(eq) —:- Be(OI-I)2(s) 0% b- Na+(3q) -— N03'(aq) 4 0.1003(5) 0% ?-i c- Bazfiaql + mes-(sq) —» BalNOsizlis) 0% d. Ne+(eq) -— OH'(eq) _. Ned-1(9) 0% e. none of these 100% a which of the following pairs of aqueous solutions, when mixed, give{s) a precipitation reaction? (i) Sodium sulfide + nicke|{H) sulfate (ii) Lead{II) nitrate + potassium bromide {iii} Sodium iodide + mercuryfl) nitrate Student Value Correct answer Feedback Response a. None give a 0% precipitation reaction b. {i} only 0% :'21 c. {i} and {iii) 0% only d. {ii} and {iii} 0% only e. All give 100% E precipitation reactions 11. In the following reaction which element is the oxidizing agent? 3Cu + SHNG3 ---:> CU{N03)2 + 2N0 + 4H20 Student Response a. Cu 0% Your choices were: A. Cu B. H C. O D. none of the above E. N Value Correct Answer Feedback The correct answer is E. See section 4.3 in your textbook. d. none of the 0% above e. N 100% E Predict the product{s) using a balanced equation and state whether the following is a redox reaction: BaC|2{aq) + NaZSO4{aq) 2: Student Response a. BaCl2{aq) + 0% Na2504{aq) 2: NaCI{aq) + BaSO4{aq): not a redox reaction b. BaCl2{aq) + 0% Na2504{aq) 2: NaCI{aq) + BaSO4{s): redox reaction C. BaCl2(aq) + 0% Na2504{aq) 2: NaCI{aq) + BaSO4{s): not a redox reaction cl. BaCl2(aq) + 0% Na2504{aq) 2: 2NaCl{aq) + BaSO4{s): redox reaction e. BaCl2{aq) + 100% E Na2504{aq) 2: 2NaCl{aq) + BaSO4{s): not a redox reaction Value Correct Answer Feedback ...
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