CHEM107 FINAL EXAMINATION 34x6 200 pts 2-hours test time NAME (IN CAPS:MOHAGONY

Question

CHEM107 FINAL EXAMINATION 34x6 200 pts 2-hours test time NAME (IN CAPS:MOHAGONY HEADEN DATE: 12/hn .Answer ALL questions. Each question carries six (6) points. T show your work on paper where the calculations are needed. Merely circling answers will be considered GUESS WORK/COPIED from others and no CREDIT will be given. MUST write the answer on both TEST PAPER AND Scrantron 1. Which one of the following combinations cannot function as a buffer solution? A) HNO2 and NaNO B) NHs and (NH) SO4 C) HCN and KCN D) HF and NaF E) HNO3 and NaNO 2. The reaction 2SOdg2SO2(g) + O2(g) is endothermic. If the temperature is increased, A) Kc will decrease. B) no change will occur in Kc . C) Ke will increase. D) the pressure will decrease. more SOs will be produced. E) 3. Which one of these salts will form a neutral solution on dissolving in water? A) KNO2 B) NaCN C) FeCl NaCI E) NHNO, 4. Which one of these salts will form an acidic solution upon dissolving in water? A) KOH B) NaF C) LiBr D) NH4Br E) NaCN 5·The following data were obtained for the hypothetical reaction 2A + B products. [Ajo (M) [BJo (M) Initial Rate (M/s) 0.2 0.2 0.6 0.1 0.2 0.1 20 15 What is the overall order of this reaction? A) 3 B)4 CO D E) 1/2 6. Which of the following molecules is polar? 7. Which of the following is not a colligative property? A) solute solubility B) boiling-point elevation C) osmotic pressure D) freezing-point lowering E) vapor-pressure lowering 8. The solubility of gases in water usually increases with increasing temperature and decreasing pressure increasing temperature only increasing pressure and increasing temperature decreasing temperature and increasing pressure decreasing temperature and decreasing pressure A) B) E)

Explanation / Answer

Answer 1

E.HNO3 is a strong acid, therefore HNO3 and NaNO3 cannot function as a buffer.

Answer 2

C.If Kc increases with an increase in temperature, the reaction to shifts to the right

Answer 3

D. NaCl will form a neutral salt when mixed with the water.

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