23. Which of the following compound is not going to dissolve in carbon tetrachloride?
(A)CO₂
(B)CH₂=CH₂
(C)NH₄NO₃
(D) KrF₂
(E)C₆H₁₄ (Hexane)

1. A sample containing 33.42 g of metal pellets is poured into a graduated cylinder initially containing 12.7 mL of water, causing the water level in the cylinder to rise to 21.6 mL. The density of the metal is mg/cm3 . (A)3755(B)3760(C)3800 (D) 4000 (E)none of these

2. Which of the following pairs is incorrect? (A)NaNO2, sodium nitrite(B)K2Cr2O7, potassium chromate(C)Rb2O, rubidium oxide (D) NH4CH3COO, ammonium acetate (E)Mg(CN)2, magnesium cyanide

3. Which one of the following statements is incorrect? (A)Lead(IV) carbonate has its formulas of Pb(CO3)2.(B)The systematic name for NaH2PO4 is sodium dihydrogen phosphate. (C)A possible name for CuBr2 is cuprous bromide. (D) The systematic name for AsF5 is arsenic pentafluoride. (E)The systematic name for LiOCl is lithium hypochlorite.

4. Which of the following gases would you expect to have the smallest value of of the van der Waals constant b: H2, N2, CH4, C2H6, C3H8?. (A)H2(B)N2(C)CH4 (D) C2H6 (E)C3H8

5. Which one of the following statements is incorrect? (A)At constant temperature, the lighter the gas molecules, the faster the average velocity of the gas molecules. (B) A real gas behave most ideally when the container volume is relatively large and the gas molecules are moving relatively quickly. (C) For a 1.0-L container of neon gas at STP, its average velocity will increase when the volume of the container is decreased to 0.5 L. (D) At constant V and T, when gas added into the container, the number of collision per unit area increases to result in a higher pressure. (E)For a 1.0-L container of neon gas at STP, its kinetic energy will increase when its temperature is increased to 100℃.

6. A 12.6-g sample of acetylene (C2H2) produced a temperature increase of 16.9℃ in a bomb calorimeter (heat capacity = 31.5 kJ/℃). The energy of combustion for acetylene is thus kJ/mol. (A)532(B)1100(C)-1100 (D) -532 (E)3830

7. A certain reaction has an activation energy of 54.0 kJ/mol. As the temperature is increased from 22℃to a higher temperature, the rate constant increases by a factor of 7.00. The indicated higher temperature is K. (A)335(B)289(C)324 (D) 340 (E)351

8. The decomposition of ethanol (C2H5OH) on an alumina (Al2O3) surface, C2H5OH(g) → C2H4(g) + H2O(g), was studied at 600 K. Concentration versus time data were collected for this reaction, and the plot of [A] versus time resulted in a straight line with a slope of -4.00 × mol/L*s. If the initial concentration of ethanol was 1.25 × M, the time required to decompose all ethanol was .(A)5.22 min(B)313 min(C)156 min(D) 31.3 min(E)0.26 min

9. For the reaction PCl5(g) PCl3(g) + Cl2(g) at 327℃, the equilibrium constant, Kp, is 11.5. Suppose that 2.450 g PCl5 is placed in an evacuated 500-mL bulb, which is then heated to 327℃. The partial pressure of PCl3 at equilibrium is atm. (A)0.1(B)2.22(C)1.06 (D) 0.38 (E)4.80

10. Which of the following 0.10 M solutions are correctly arranged in order of the strongest acidic to the weakest acid? (Ka of HNO2 = 4.0 × 10-4; Kb of HONH2 = 1.1 × 10-8) (A)HClO4 > HNO2 > CaBr2 > KNO2 > HONH3ClO4(B)HNO2 > HClO4 > CaBr2 > HONH3ClO4 > KNO2 (C) HONH3ClO4 > HClO4 > HNO2 > CaBr2 > KNO2 (D) HClO4 > HNO2 > HONH3ClO4 > CaBr2 > KNO2 (E)KNO2 > HClO4 > HNO2 > CaBr2 > HONH3ClO4

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