5. Which gas has the highest density?
(A) He
(B) Cl₂
(C) CH₄
(D) NH₃
(E) all the gases have the same density

6. Which of the following statements (I-IV) about "oxidation and reduction" is (are) true? I: cannot occur independently of each other； II: accompany all chemical changes； III: describe the loss and gain of electron(s), respectively； IV: result in a change in the oxidation states of the species involved (A) I only (B) II only (C) III only (D) IV only (E) I, III, and IV

7. The value of the equilibrium constant K is dependent on: I: the temperature of the system； II: the nature of the reactants and products； III: the concentration of the reactants； IV: the concentration of the products. (A) I and II only (B) II and III only (C) III and IV only (D) three of these (E) none of these

8. For which gas do the molecules have the highest average velocity? (A) He (B) Cl2 (C) CH4 (D) NH3 (E) the molecules of all the gases have the same average velocity

9. Consider the following equilibrium: H2(g) + I2(s)⥨ 2HI(g) ΔΗ = +68.0 kJ/mol Which of the following statements about the equilibrium is false? (A) if the system is heated, the right side is favored (B) this is a heterogeneous equilibrium (C) if the pressure on the system is increased by changing the volume, the left side is favored (D) adding more H2(g) increases the equilibrium constant (E) removing HI as it forms forces the equilibrium to the right

10. According to the Brønsted-Lowry definition, an acid is (A) a substance that increases the hydroxide ion concentration in a solution (B) a substance that increases the hydrogen ion concentration in a solution (C) a substance that can accept a proton from another species in solution (D) a substance that can donate a proton to another species (E) an electron pair acceptor.

11. Which of the following species is not amphoteric? (A) (B) (C) (D) H2O (E) all of these

12. The salt BX, when dissolved in water, produces an acidic solution. Which of the following could be true? (A) HX is a weak acid (B) HX is a strong acid (C) the cation B+ is a weak acid (D) all of these could be true (E) Both HX and the cation B+ are weak acids

13. Which of the following compounds has the lowest solubility, in moles per liter, in water at 25°C? (A) (B)  (C) (D) (E)

14. You have two salts, AgX and AgY, with very similar values. You know that Ka for HX is much greater than Ka for HY. Which salt is more soluble in acidic solution? (A) AgX (B) AgY (C) They are equally soluble in acidic solution (D) This cannot be determined from the information given (E) none of these

15. Given the equation S(s) + O2(g) → SO2(g), ∆H = −296 kJ, which of the following statements is(are) true? I: The reaction is exothermic； II: When 0.500 mol of sulfur is reacted, 148 kJ of energy is released； III: When 32.0 g of sulfur is burned, 2.96 x 105 J of energy is released. (A) all are true (B) none is true (C) I and II are true (D) I and III are true (E) only II is true

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