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Lecture 15

CHEM 1201 Lecture 15: Comprehensive HW Ch. 4-6
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Department
Chemistry
Course
CHEM 1201
Professor
irina Nesterova
Semester
Spring

Description
ComprehensiveHWCh.4-6Answers 1. When aqueous solutions of ________ are mixed, a precipitate forms. a. NaI and KBr b. KOH and Ba(NO ) 3 2 c. L2 CO 3nd CsI d. NiBr2and AgNO 3 e. K2SO 4nd CrCl 3 2. The net ionic equation for the reaction between aqueous solutions of HF and KOH is ________. + - a. HF + K + OH → H 2 + KF b. H + F + K + OH -→ H O + K + F - 2 c. H + OH -→ H 2 - - d. HF + OH → H2O + F e. HF + KOH → H2O + K + F - 3. Which of the following are strong acids? HI HNO 3 HF HBr a. HI, HF, HBr b. HI, HNO 3 HF, HBr c. HNO ,3HF, HBr d. HF, HBr e. HI, HNO 3 HBr 4. Which solution contains the largest number of moles of chloride ions? a. 4.00 mL of 1.000 M NaCl b. 25.00 mL of 0.400 M KCl c. 7.50 mL of 0.500 M FeCl 3 d. 10.0 mL of 0.500 M BaCl 2 e. 30.00 mL of 0.100 M CaCl 2 5. Which one of the following is not true concerning 2.00 L of 0.100 M solution of Ca (PO ) ? 3 4 2 a. 1.00 L of this solution is required to furnish 0.300 mol ofions. 2+ b. This solution contains 0.600 mol of Ca . c. This solution contains 0.800 mol of oxygen atoms. 22 d. There are 6.02 × 10 phosphorus atoms in 500.0 mL of this solution. e. This solution contains 0.200 mol of C3 (PO4 2. 6. A 31.5 mL aliquot of H2SO 4aq) of unknown concentration was titrated with 0.0134 M NaOH (aq). It took 23.9 mL of the base to reach the endpoint of the titration. The concentration (M) of the acid was ________. a. 0.102 b. 0.227 c. 0.00508 d. 0.0102 e. 0.0204 7. A 18 mL aliquot of 0.1MH PO 4(aq)is to be titrated with 0.MNaOH(aq) . What volume (mL ) of base will it take to reach the equivalence point? a. 121 b. 39.5 c. 13.2 d. 4.38 e. 267 8. Which combination will produce a precipitate? a. AgNO (3q) and Ca(C H O2) 3aq2 2 b. KOH (aq) and Mg(NO ) (3 2 c. NaC 2 O3(a2) and HCl (aq) d. NaOH (aq) and HCl (aq) e. NaF (aq) and HCl (aq) 9. Which combination will produce a precipitate? a. NH 4H (aq) and HCl (aq) b. NaOH (aq) and Fe(NO ) (3 2 c. AgNO (3q) and Ca(C H O2) 3a2 2 d. NaCl (aq) and HC H2O 3aq2 e. NaOH (aq) and HCl (aq) 10. The kinetic energy of a 23.2-g object moving at a speed of 98.7 m/s is ________ J. a. 113000 b. 145 c. 1450 d. 0.950 e. 113 11. The value of ΔH° for the reaction below is -72 kJ. ________ kJ of heat are released when 80.9 grams of HBr is formed in this reaction. H 2g) + Br 2g) → 2HBr (g) a. 144 b. 72 c. -72 d. 36 e. 0.44 12. Which one of the follow
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