Question

In which set are both compounds soluble is water? (A) magnesium (MgCI_2) and octane (C_6H_18) (B) ethanol (CH_2CH_2OH) and propane (CH-3CH_2CH_3) (C) carbon tetrachloride (CCI_4) and magnesium chloride (MgCI_2) (D) magnesium chloride (MgCI_2) and ethanol (CH_2CH_2OH) When potassium chloride, KCI dissolves in water, which of these diagram would best what you would expect to find in solution? Which is a precipitation reaction? (A) 2Cr(s) + 6HNO_3(aq) rightarrow 2Cr(NO_3)_3(aq) + 3H_2(g) (B) H_3PO_4(aq) + 3KOH(aq) rightarrow K_3PO_4(aq) + 3H_2O(l)) (C) 3Ba(NO_3)_2(aq) + 2Na_3PO_4(aq) rightarrow NaCI(aq) + CO_2(g) + H_2O(l) What is the net ionic equation for the reaction of aqueous solutions of Pb(NO_3)_2 and KCI? (A) Pb^2+(aq) + CI^-(aq) rightarrow PbCI_2(l) (B) Pb^2+(aq) + 2CI^-(aq) rightarrow PbCI_2(l) (C) Pb(NO_3)_2(aq) + 2KCI(aq) rightarrow 2KNO_3(aq) + PbCI_2(l) (D) 2K^+(aq) + 2CI^-(aq) + Pb^2+(aq) + 2NO_3^-(aq) rightarrow 2K^+(aq) + NO_3^-(aq) + PbCI_2(l) Which statement is correct for this CH_3^-(g) + NH_2(g) CH_4(g) + NH_2(g) (A) CH_3^- acts as a base. (B) CH_3^- is the conjugate acid of CH_4. (C) CH_3 acts as a base. (D) NH_2^- is the conjugate acid of NH_2. Which is a conjugate acid-bases pair is the N_2H_4(aq) + H_2O(l) N_2H_5^+(aq) + OH^-+(aq) (A) N_2H_4 and H_2O (B) N_2H_2^+ (C) N_2H_4 and N_2H_3^+ The pH of four different solutions was then small amounts of strong acid (0.01) consecutively to equal volumes of each. From these measurements, we can conclude any acid was added (A) solutions 1 and 3 are buffers but solutions grater buffer capacity than 1. (B) solutions 2 and 4 are buffers but solution greater buffer capacity than 4. (C) solution 3 and 4 are buffers but solution greater buffer capacity than 3. (D) none of the four initial solutions is a buffer. Equal volumes of solutions of acids and their salts are mixed to prepare a buffer. The solution closest to 5.0 was prepared by mixing (A) 1.0 times 10^-5 M hydrochloric acid and 0.1 M (B) 0.10 M benzoic acid (K_a = 6.3 times 10^-6) and sodium benzoate (C) 0.10 M butyric acid (K_a = 1.5 times 10^-5) and sodium butyrate (D) 0.10 M formic acid (K_a = 4.3 times 1^-4) and sodium format

Answer 1

25. Answer:D);because only ionic/ organic polar compounds are soluble in water. MgCl2 is ionic and ethanol is organic but polar. 26. Answer: A); because being+vely charged K, it is well solvated by water due to interaction with oxygen and similarly being-vely charged Cl, it is well solvated by water due to interaction with hydrogen. 27. Answer:C); because Ba compounds are insoluble in water and precipitate out. 28. Answer:D) 29. Answer:A):because it accept H* from NHs (which plays acid role here) Answer: C) Question 31 & 32 are not clear.