FinalA - CHM 115 Final Exam version A Name_ Avogadro's...

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CHM 115 Final Exam version A Name___________________________________ Avogadro's number = 6.02 x 10 23 , h = 6.626 x 10 - 34 J s, c = 3 x 10 8 m/s MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. EACH QUESTION IS WORTH 2 PTS. 1) The formula weight of potassium dichromate (K 2 Cr 2 O 7 ) is __________ amu. A) 242.18 B) 333.08 C) 255.08 D) 294.18 E) 107.09 1) 2) In which reaction does the oxidation number of hydrogen change? A) 2 Na (s) + 2 H 2 O ( l ) 2 NaOH (aq) + H 2 (g) B) 2 HClO 4 (aq) + CaCO 3 (s) Ca(ClO 4 ) 2 (aq) + H 2 O ( l ) + CO 2 (g) C) HCl (aq) + NaOH (aq) NaCl (aq) + H 2 O ( l ) D) SO 2 (g) + H 2 O ( l ) H 2 SO 3 (aq) 2) 3) Screening by core electrons in atoms is __________. A) less efficient than that by valence electrons B) essentially identical to that by valence electrons C) responsible for a general decrease in atomic radius going down a group D) more efficient than that by valence electrons E) both essentially identical to that by valence electrons and responsible for a general decrease in atomic radius going down a group 3) 4) Combining aqueous solutions of BaI 2 and Na 2 SO 4 affords a precipitate of BaSO 4 . Which ion(s) is/are spectator ions in the reaction? A) Na + and I - B) Na + only C) Ba 2 + and SO 4 2 - D) Ba 2 + only E) SO 4 2 - and I - 4) 5) Which pair of atoms constitutes a pair of isotopes of the same element? A) 17 9 X 17 8 X B) 14 6 X 12 6 X C) 14 6 X 14 7 X D) 20 10 X 21 11 X E) 19 10 X 19 9 X 5) 6) Which element would be expected to have chemical and physical properties closest to those of fluorine? A) Ne B) O C) S D) Fe E) Cl 6) 1
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7) Which equation correctly represents the first ionization of phosphorus? A) P + (g) + e - P (g) B) P (g) P - (g) + e - C) P (g) P + (g) + e - D) P (g) + e - P - (g) E) P - (g) P (g) + e - 7) 8) The value of ΔE for a system that performs 213 kJ of work on its surroundings and loses 79 kJ of heat is __________ kJ. A) - 292 B) + 134 C) + 292 D) - 134 E) - 213 8) 9) The uncertainty principle states that __________. A) it is impossible to know how many electrons there are in an atom
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FinalA - CHM 115 Final Exam version A Name_ Avogadro's...

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