When aqueous solutions of ___________ are mixed, a precipitate forms. A) K_2 SO_

Question

When aqueous solutions of ___________ are mixed, a precipitate forms. A) K_2 SO_4 and NaCl B) Nal and KBr C) NiBr_2 and AgNO_3 D) KOH and Ba(NO_3)_2 E) Li_2 CO_3 and Csl Using the graph below, determine the gas that has the lowest molecular mass at STP. A) A B) B C) C D) D E) All of the gases have the same density at STP. For delta E_ to always be (-), what must be true? A) q = w B) +q > -w C) +w > -q D) -w > +q E) None of the above The reaction 4AI(s) + 3O_2 (g) rightarrow 2A _2 O_3 (s) delta H degree = -3351 kJ is _____, and therefore heat is _______ by the reaction. A) endothermic, released B) endothermic, absorbed C) exothermic, released D) exothermic, absorbed E) released nor absorbed

Explanation / Answer

Question 19

The correct answer is C) NiBr2 and AgNO3.

This is the reaction that occurs:

2NiBr2 + 2AgNO3 -> 2AgBr(s) + Ni(NO3)2

AgBr will be a precipitate because Ag compounds with halogens (Br, Cl, Br and I) are insoluble as a given rule.

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