So i have my chemistry exam next week and this is a questionfrom the practice test. I am wondering more of the how/why for thisquestion than just the answer? How do you tell what is soluable andwhat isn't how to know what the reaction is gonna be? Is there anyeasier way to think about this than memorizing the solubilitychart. And even with he chart memorized... how do i answer aquestion like this, am i looking for slightly soluble?

When aqueous solutions of ________ are mixed, a precipitateforms.

A) NiCl2 and AgNO3

B) NaCl and KBr

C) K2SO4 and CrCl3

D) KOH and AgNO3

E) Li2CO3 and KCl

more questions I'm concerned about... again not looking for theanswers just like how to go about understanding the solubility andreactions between substances?

Which of the following is an oxidation-reduction reaction? A)HCl (aq) + NaOH (aq) → H2O (l) + NaCl (aq) B) AgNO3 (aq) + HCl (aq)→ AgCl (s) + HNO3 (aq) C) BaCl2 (aq) + Na2SO4 (aq) → BaSO4 (s) +2NaCl2(aq) D) Mg (s) + 2AgNO3 (aq) → 2Ag (s) + Mg(NO3)2 (aq) E)H2CO3 (aq) + Ca(NO3)2 (aq) → 2HNO3 (aq) + CaCO3 (s)

4) The balanced reaction between aqueous nitric acid and aqueousstrontium hydroxide is ________. A) 2HNO3 (aq) + Sr(OH)2 (aq) →2H2O (l) + Sr(NO3)2 (aq) B) HNO3 (aq) + Sr(OH)2 (aq) → Sr(NO3)2(aq) + H2 (g) C) HNO3 (aq) + Sr(OH)2 (aq) → H2O (l) + Sr(NO3)2 (aq)D) HNO3 (aq) + SrOH (aq) → H2O (l) + SrNO3 (aq) E) 2HNO3 (aq) +Sr(OH)2 (aq) → Sr(NO3)2(aq) + 2H2 (g)
5) In which reaction does the oxidation number of hydrogen change?A) HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l) B) 2Na (s) + 2H2O (l)→ 2NaOH (aq) + H2 (g) C) CaO (s) + H2O (l) → Ca(OH)2 (s) D) 2HClO4(aq) + CaCO3 (s) → Ca(ClO4)2 (aq) + H2O (l) + CO2 (g) E) SO2 (g) +H2O (l) → H2SO3 (aq)