24.Beta decay of produces a beta particle and
(A)
(B)
(C)
(D)

1. Which of the following pairs is incorrect? (A)NH4Br, ammo onium bromide (B)K2,CO3,potassium carbonate (C)BaPO4 , barium phosphate (D) CuCl,copper(I) chloride (E) MnO2, manganese (IV) oxide

2. Rutherford's experiment was important because it showed that: (A)radioactive elements give off alpha particles. (B)gold foil can be made to be only a few atoms thick. (C) a zinc sulfide screen scintillates when struck by a charged particle. (D) the mass of the atom is uniformly distributed throughout the atom. (E) an atom is mostly empty space.

3.The atomic mass of rhenium is 186.2. Given that 37.1% of natural rhenium is rhenuim-185,what is the other stable isotope? (A)(B)(C)(D)(E)

4. The following reactions are examples of (A)precipitation reactions. (B)redox, precipitation, and acid-base, respectively. (C)precipitation (two) and acid-base reactions, respectively. (D) redox reactions. (E) none ofthese 75 Re , D) 7s Re

5. A 0.307-g sample of an unknown triprotic acid is titrated to the third equivalence point using 35.2 mL of 0.106 M NaOH. Calculate the molar mass of the acid. (A)247 g/mol (B)171g/mol (C)165 g/mol (D) 151 gmol (E) 82.7gmol

6. Consider two organic molecules, ethanol and benzene. One dissolves in water and the other does not. Why? (A)They have different molar masses. (B)One is ionic, the other is not. (C)One is an electrolyte, the other is not. (D) Ethanol contains a polar O–H bond, and benzene does not. (E) Two ofthese.

7. Calculate the density of nitrogen at STP. (A)0.312 g/L (B)0.625 g/L (C)0.800 g/L (D) 1.25 g/L (E) 1.60 g/L

8. The van der Waals equation, , incorporates corrections to the ideal gas law in order to account for the properties of real gases. One of the corrections accounts for (A) the possibility of chemical reaction between molecules. (B) the finite volume of molecules. (C)the quantum behavior of molecules. (D) the fact that average kinetic energy is inversely proportional to temperature. (E) the possibility of phase changes when the temperature is decreased or the pressure is increased.

9. A 25.0 g piece of aluminum (which has a molar heat capacity of 24.03J/℃mol) is heated to 82.4*C and dropped into a calorimeter containing water (specific heat capacity of water is 4.18J/g℃initially at 22.3C. The final temperature of the water is 24.9℃. Calculate the mass of water in the calorimeter. (A)118 g(B)6.57g (C)3180g (D) 2120g (E) none of these

10. Calculate the lattice energy for MgO(s) using a Bomn-Haber cycle and the following information: (A)+1842 kJ/mol (B)+2444 kJ/mol (C)+3844 kJ/mol (D) +4108 kJ/mol

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