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5. The solubility of a gas in a liquid generally A) increases with increasing temperature. B) increases with decreasing temperature. C) increases with increasing pressure. D) both (a) and (c). E) both (b) and (c). 6. From a consideration of the Lewis structure of the thiocyanate ion, SCN, in which carbon has a double bond with both the sulfur and nitrogen atoms, the formal charges on the sulfur, carbon, and nitrogen atoms are, respectively, A) 1,0,0. B) 0,0,1. C) 1,+1,1. D) 2,+1,0. E) 2,0,+1. 7. Which of the following properties, in general, increase as we move left to right across a period in the periodic table? 1. atomic radius 2. ionization energy 3. metallic character A) 1 only B) 2 only C) 3 only D) 1 and 2 only E) 2 and 3 only 8. Energy from the following reaction provided the lift for the moon lander: (CH3)2N2H2+N2O4N2+H2O+CO2 When the equation is balanced, the coefficient of nitrogen is A) 1 . B) 2 . C) 3 . D) 4 . E) 5 . 9. A nitrogen atom is the central atom in laughing gas, N2O, dinitrogen oxide, which has the following characteristics: A) linear, polar. B) bent, nonpolar. C) bent, polar. D) linear, nonpolar. E) trigonal planar, nonpolar