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Which of the following reactions best describes the acid–base properties of ammonia (NH3) in aqueous solution?

The oxidation number of chromium in sodium chromite, NaCrO2, is

Identify the spectator ions in the following reaction. Ca2+(aq) + 2NO3–(aq) + 2Na+(aq) + CO32–(aq) → CaCO3(s) + 2Na+(aq) + NO3–(aq)

Which equation best represents the net ionic equation for the reaction that occurs when aqueous solutions of potassium phosphate and iron(II) nitrate are mixed?

Which of the following chemical equations best represents the dissolution of a soluble group 2A metal hydroxide in water?

Which of the following aqueous solutions would be expected to be the best conductor of an electric current at room temperature?

What is the oxidation number of Ba in BaFeO4?

Which of the following combinations will produce a precipitate?   1. AgNO3(aq) and HCl(aq)   2. HCl(aq) and Na2CO3(aq)   3. NaOH(aq) and K3PO4(aq)

When the following equation is balanced with lowest whole-number coefficients, what is the coefficient for NO(g)? ___NH3(g) + ___O2(g) → ___NO(g) + ___H2O(g)

What is the reduction half-reaction for the reaction of zinc with hydrochloric acid? Zn(s) + 2H+(aq) + 2Cl–(aq) → Zn2+(aq) + 2Cl–(aq) + H2(g)