Which of the following reactions of aqueous ionic compounds will form a precipitate when their solutions are combined A CaCl2 (aq) + Mg(NO3)2 (aq) --> Ca(NO3)2 (+) + MgCl2 (?)
B. OKCI
(aq)
--> KNO3(?) + AgCl()
C. NaCl
(aq) + KNO3(aq) --> NaNO3 (>) + KCI)
+ AgNO3(aq)
D
NH, Br
(aq)
+ KCI (aq) --> NH4Cl () + KBr (>)

H2so4(aq) + mg(s)—> mgso4(aq) +h2(g) which substance is the acid in the reaction?

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.

Chlorine and water react to form hydrogen chloride and oxygen, like this: 2cl2 (g) + 2h2o (g) → 4hcl (g) + o2 (g) also, a chemist finds that at a certain temperature the equilibrium mixture of chlorine, water, hydrogen chloride, and oxygen has the following composition: compound concentration at equilibrium cl2 0.55m h2o 0.57m hcl 0.53m o2 0.34m calculate the value of the equilibrium constant kc for this reaction. round your answer to 2 significant digits.