A) solvents B) liquids C) gases D) molecules E) spectator ions 19) Calcium chlor
ID: 637179 • Letter: A
Question
A) solvents B) liquids C) gases D) molecules E) spectator ions 19) Calcium chloride reacts with sodium hydroxide to form solid calcium hydroxide, Ca(OH)2. The 19) balanced net ionic equation is A) Ca+2(aq) + 20H-(aq) + Na+(aq) + Cl-(aq) ? Ca(OH)2(s). B) Ca+2(aq) + 2OH-(aq) ? Ca(OH)2(s). C) Ca 2(aq) 20H-(aq)+2 Na*(ag) 2 CI-(aq) -Ca(O2(). D) CaCI2(aq) 2NaOH(aq) CaOH(s) NaCl(aq). E) CaCl2(ag) 2NaOH(aq) Ca(OH)2(s)+ 2NaCI(aq). 20) How many mL of 1.24 M H2504 reacts with 1.26 g of Al? 2AI (s) 3H2SO4 (aq)--Al2(SO4)3 (aq)+3 H2 (g) A) 22.2 mL B) 56.5 mL C) 0.565 mL D) 448 mL E)37.7 mL 21) According to the Arrhenius concept, if HNO3 were dissolved in water, it would act as- A) an acid B) a base C) a source of H- ions D) a source of hydroxide ions E) a proton acceptor 22) According to the Bronsted-Lowry definition, A) a base is a proton acceptor B) an acid acts as the solvent. C) an acid is a proton acceptor D) a base produces Ht ions in aqueous solutions. E) a base is a proton donor.Explanation / Answer
19. CaCl2(aq) + 2NaOH(aq) -------> Ca(OH)2(s) + 2NaCl(aq)
Ca^2+(aq) + 2Cl^-(aq) + 2Na^+ (aq) +2OH^-(aq) -------> Ca(OH)2(s) + 2Na^+ (aq) +2Cl^-(aq)
Ca^2+(aq) +2OH^-(aq) -------> Ca(OH)2(s) net ionic equation
B.Ca^2+(aq) +2OH^-(aq) -------> Ca(OH)2(s) >>>>answer
20. no of moles of Al = W/G.M.Wt
= 1.26/27 = 0.047moles
2Al(s) + 3H2SO4(aq) --------> Al2(SO4)3(aq) + 3H2(g)
2 moles of Al react with 3 moles of H2So4
0.047 moles of Al react with = 3*0.046/2 = 0.07 moles of H2SO4
no of moles of H2SO4 = molarity * volume in L
0.07 = 1.24* volume in L
volume in L = 0.07/1.24 = 0.0565L = 56.5ml
B.56.5ml >>>>answer
21.A. an acid
22. A.a base is a poton acceptor
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