Question

3. Which of the following changes to a saturated solution of Mg(OH)2 will cause the solubility of Mg(OH)2 to increase, dissolving more of the solid? A. Addition of soluble NaOH B. Addition of soluble Mg(NO3)2 C. Addition of Mg(OH)2(5) D. Lowering the pH of the solution E. Increasing the pH of the solution 4. Which of the following best describes the redox reaction occurring in the hydrogen fuel cell? A. H2 + 2OH → 2H2O B. H* + OH-H20 C. 2H2 + O2 + 2H2O D. 2H2O → 2H2 + O2 E. 2H2O2 → 2H2O + O2

Answer 1

2) Ма (ви), %, а Ма (би) 4 = бралса, қолаве Боке Ma"uap + 200" (02) It we decrease the one by adding Hot ious, the added Hot Pons will react with on ions and form water. so on ions are removed from the solution Then, according to Le Chatever's Punuple, the position or the equiubium moves to the right to replace о е окЯрия. Thus, the solubility of MgCona inereases. & correct option is o (6) lowering the pH of the solution

4 u the hydrogen the combination цасақ. suel cell, hydrogen of the and overall oxygen reaction is to form Anode o : Cathode & 21 H₂ (g) + 204 caq) → 20 & 20 ) 2 (Hy wst 20ton Og +240 + 40 - 40k cap) cell reaction of 2H2 (g) + O2 g - 2H20 (1) + 2 0 80 correct option is 8 (C) 2 H₂
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