Choose the correct ranking based on acid strength for these three acids. Each pi

Question

Choose the correct ranking based on acid strength for these three acids. Each picture is a representation of an ionized acid that is dissolved in water. The water molecules are not included in the pictures for the sake of clarity. (A) HY > HX > HZ (B) HY > HZ > HX (C) HZ > HY > HX (D) HZ > HX > HY A one liter solution contains 0.200 M CH_3COOH (K = 1.8 times 10^-5) and 0.200 M CH_3COONa The initial pH is 4.74. Calculate the pH when 0.0500 mole of HCl is added to the solution. (A) 4.96 (B) 4.74 (C) 4.52 (D) 4.23 Ten millimeters of 0.10 M ammonium chloride is titrated with 0.10 M sodium hydroxide, The titration curve is shown. What is the approximate pK of the ammonium ion? (A) 12.0 (B) 10.5 (C) 9.0 (D) 7.2 What is the conjugate base of H_2PO^-_4? (A) PO^2-_3 (B) Po^2-_4 (C) H_3PO_4 (D) HPO^2-_4 Which statement is true about the pH of an aqueous solution? (A) As pH increases, pK_w increases. (B) As pH increases, pK_w decreases. (C) As pH increases, hydroxide ion concentration increases. (D) As pH increases, hydronium ion concentration increases. At 50 degree C, pK_w = 13.26. What is the pH of pure water at this temperature? (A) 13.26 (B) 7.37 (C) 7.00 (D) 6.6.3 Which is a Lewis acid-base reaction, but not a Bronsted-Lowry acid-base reaction? (A) NH_2(g) + BF_3(g) rightarrow H_3NBF_3(g) (B) NH_2(g) + H_2O(l) rightarrow NH _4(aq) + OH^-(aq) (C) CH_3NH_2(aq) + HBr(aq) rightarrow CH_3NH^2_3(aq) + Br^-(aq) (D) CH_3COOH(aq) + H_2O(l) rightarrow CH_3COO^-(aq) + H_2O^-(aq) The K_a, of a weak acid is l 8 times 10^-4. What is the K_a of its conjugate base? (A) 1.8 times 10^10 (B) 5.6 times 10^3 (C) 18 times 10^-4 D) 5.6 times 10^-21 An aqueous buffer contains acetic acid (CH_3COOH) and sodium acetate (CH_3COONa). Which reaction shows how the buffer minimizes the pH change when HCI is added? (A) H^+(aq) + OH^-(aq) H_2O(l) (B) CH_3COO^-(aq) + H^=(aq) CH_3COOH(aq) (C) CH_3COOH (aq) + H^+(aq) CH_3COOH^+_2(aq) (D) CH_3COOH(aq) + OH^-(aq) CH_3COO^-(aq) + H_2O(l) Which is a correct statement of the third law of thermodynamics? (A) The energy of the universe is constant. (B) The entropy of the universe is constant. (C) The energy of a system is controlled by the entropy with of that system. (D) The entropy of a perfect is zero at zero k. Which has the highest standard molar entropy? (A) CH_4(g) (B) CH_3CH_2CH_3(g) (C) CH_3CH_2CH_3(l) (C) CH_3(CH_2)_2CH_3(g) Which is true for a spontaneous process? (A) The entropy of the universe always increases. (B) The entropy of the system always decreases. (C) The entropy of the system always increases. (D) The entropy of the system is equal and opposite to the entropy change of the surroundings. To cause the largest increase in entropy for one mole of an ideal gas. _____ the temperature and _____ the volume. (A) increase, increase (B) increase, decrease (C) decrease, increase (D) decrease, decrease

Explanation / Answer

Q42

The third law of thermodynamics is abut the absolute zero,

a) this is 1st law of thermo

b) this is 2nd law of thermo

c) this is also 2nd aw related

d) this is the best answer, the entropy value

Q43.

highest entropy --> must be in gas phase, since it most chaotic

must be the larges molecule, therefore, choose D

Q44

a) this is true, always increases the chaos

b) false, only universe

c) false, only universe

d) false

choose A

Q45

1 mol of gas to form high Temperature and increase volume, so it gets more microstates

choose B, increase, increase

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