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PSU CHEM 110 - Chemical reactions

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REACTIONS 1. When the following equation C9H15S + O2 → CO2 + H2O + SO2 is balanced with the smallest possible set of integer coefficients (no fractions), the coefficient preceding CO2 is A. 9 B. 27 C. 36 D. 18 E. None of the above is correct 2. When the equation for the complete combustion of ethanol, C2H5OH, to form CO2 and H2O is balanced with lowest–integer coefficients, the coefficient for O2 is A. 7 B. 6 C. 5 D. 3 E. None of the above answers is correct 3. A 100.0 g sample of a metal M is burned in air to produce 103.7 g of its oxide with the formula M2O. What is the atomic mass of the metal? A. 73 amu B. 150 amu C. 216 amu D. 290 amu E. 370 amu 4. 4.31 g of a hydrocarbon is completely combusted in oxygen and found to yield 6.36 g of water. The empirical formula for the hydrocarbon is A. C3H7 B. CH4 C. C7H4 D. C21H4 E. CH 5. 1.00 g of a compound is combusted in oxygen and found to give 3.14 g of CO2 and 1.29 g of H2O. From these data we can tell that A. the compound contains C, H, and some other element of unknown identity, so we can’t calculate the empirical formula. B. the compound contains only C and H and has the empirical formula of C6H. C. the compound contains C, H, and O and has the empirical formula of CH3O. D. the compound contains only C and H and has the empirical formula of CH2. E. None of the above is a true statementREACTIONS continued 6. Mixing solutions of K2SO4(aq) and BaCl2(aq) produces an insoluble salt. Which of the following is the correct list of spectator ions for this reaction? A. K+ , SO42– , Ba2+ , Cl– B. K+ , SO42– C. K+ , Cl – D. Ba2+ , Cl– E. Ba2+ , SO42– 7. When aqueous solutions of Fe2(SO4)3 (aq) and Pb(NO3)2(aq) are mixed, an insoluble salt forms. Which of the following reactions is the correct net ionic equation that describes this reaction? A. 2Fe+3(aq)+ 3SO42− (aq) + 3Pb2+(aq)+ 6NO3−(aq) → 2Fe(NO3)3(s) + 3Pb2+(aq) + 3SO42−(aq) B. Fe+3(aq)+ SO42−(aq) + Pb2+(aq) + 3NO3−(aq) → Fe(NO3)3(s) + PbSO4(s) C. Fe+3(aq) + 3NO3−(aq) → Fe(NO3)3(s) D. Pb2+(aq)+ 2NO3−(aq) → Pb(NO3)2(s) E. Pb2+(aq)+ SO42−(aq)→ PbSO4(s) 8. Which of these reactions will form a precipitate in water? A. Mg(OH )2 + 2 HCl → Mg(Cl)2 + 2H2O B. Mg(OH)2 + (NH4)2SO4 → MgSO4 + 2 NH3 + 2 H2O C. CaCO3 + 2 HCl → CaCl2 + CO2 + H2O D. HCl + CH3COOK → CH3COOH + KCl E. Ba(NO3)2 + K2SO4 → BaSO4 + 2 KNO3 9. Which one of the following (unbalanced) equations describes a spontaneous reaction? A. Ag(s) + HCl(aq) → AgCl(s) + H2(g) B. Hg(l) + Al3+(aq) → Hg2+(aq) + Al(s) C. Cu2+(aq) + Zn(s) → Cu(s) + Zn2+(aq) D. Ni(s) + H2O(l) → Ni(OH)2(s) + H2(g) E. None of the above describes a spontaneous reaction. 10. Which of the following reactions are redox reactions? 1. Ni(OH)2(s) + H2SO4(aq) → NiSO4(aq) + 2 H2O(l) 2. 8 NH3(g) + 6 NO2(g) → 7 N2(g) + 12 H2O(l) 3. 3 PbO(s) + 2 NH3(aq) → N2(g) + 3 H2O(l) + 3 Pb(s) A. 1 only B. 2 only C. 3 only D. 1 and 3 E. 2 and 3REACTIONS continued 11. The oxidation number of Mo (molybdenum) in Mo7O246− is: A. +6 B. +5 C. +4 D. +3 E. +2 12. 100.0 mL of Ca(OH)2 solution is titrated with 5.00 × 10−2 M HBr. It requires 36.5 mL of the acid solution for neutralization. The concentration of the Ca(OH)2 solution is A. 9.12 × 10−3 M B. 1.82 × 10−4 M C. 9.12 × 10−4 M D. 1.82 × 10−3 M E. None of the above is within 1% of the correct answer 13. Given the balanced equation for the oxidation of ethanol, C2H5OH, by potassium dichromate: 3C2H5OH + 2K2Cr2O7 + 16HCl → 3C2H4O2 + 4CrCl3 + 4KCl + 11H2O Calculate the volume of a 0.600 M K2Cr2O7 solution needed to generate 0.1665 moles of C2H4O2 from a solution containing excess ethanol and HCl. A. 278 mL B. 185 mL C. 111 mL D. 6.60 mL E. None of the above answers is correct 14. How many grams of solid NaOH will be needed to neutralize 85.0 mL of a 0.275 M solution of H2SO4? A. 0.94 g B. 19.1 g C. 1.87 g D. 0.47 g E. 6.41 g 15. When 47.3 mL of 0.107 M HCl is added to 54.7 mL of 0.213 M NaOH, the resulting OH− concentration is: A. 0.028 M B. 0.065 M C. 0.114 M D. 0.120 M E. 0.213 MREACTIONS continued 16. A method of removing CO2(g) from a spacecraft is to allow it to react with solid NaOH: 2 NaOH(s) + CO2(g) → Na2CO3(s) + H2O(l) How many liters of CO2(g) at 26.0°C and 755 mm Hg can be removed per kg NaOH? A. 24.7 B. 16.3 C. 12400 D. 618 E. 309 17. A gaseous sample of pure methane, CH4, is found to occupy a volume of 20.0 L at 25°C and 1 atm pressure. What volume of O2, at the same temperature and pressure, should be just sufficient to permit complete combustion of the methane? A. 10.0 L B. 20.0 L C. 30.0 L D. 40.0 L E. None of the above is correct. 18. The following reactions involve only gases. Which of them, if carried out in a closed container at constant temperature, would proceed with a decrease in pressure? A. 2 CO + O2 → 2 CO2 B. 2 NH3 → N2 + 3 H2 C. N2 + O2 → 2 NO D. 2 O3 → 3 O2 E. 2 HI → H2 + I2 19. Which of the following compounds would react most rapidly with bromine (Br2) at room temperature? a) pentane CH3 - CH2 - CH2 - CH2 - CH3 b) toluene c) ethanol CH3 - CH2 - OH d) cyclopentane e) 2-hexene CH3 - CH2 - CH2 - CH = CH - CH3 C H 3REACTIONS continued 20. Choose the appropriate words to fill in the blanks. A condensation reaction between a _______ and a _______ will form an _________. A. amide, ester, alcohol B. amine, carboxylic acid, amide C. alcohol, amine, amide D. alcohol, alcohol, ester E. alcohol, carboxylic acid, amide 21. Below is a segment of a polymer formed via an addition reaction. Which one of the following is the monomer that was used to form this polymer? A B C D E CC CC CC CCHCH3HCH3HCH3HCH3HH HH HH


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PSU CHEM 110 - Chemical reactions

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