Predict and Balance: 4.)copper II nitrate is dissolved in 100mL of deionizedwate

Question

Predict and Balance: 4.)copper II nitrate is dissolved in 100mL of deionizedwater 7.) hydrogen chloride gas is bubbled through cold water 8.) electrical current produced by a 6 volt battery is passedthrough water. 12. )a small piece of copper is dropped into 1 M hydrochloricacid 13.) octane is burned in a car's engine Predict and Balance: 4.)copper II nitrate is dissolved in 100mL of deionizedwater 7.) hydrogen chloride gas is bubbled through cold water 8.) electrical current produced by a 6 volt battery is passedthrough water. 12. )a small piece of copper is dropped into 1 M hydrochloricacid 13.) octane is burned in a car's engine

Explanation / Answer

9. This would be a fun experiment! Sodium and water react toproduce self-igniting hydrogen gas!       Na + H2O--> NaOH + H2     Now balance the equation:         Na + 2H2O--> NaOH + H2           Na + 2H2O--> 2NaOH + H2 2Na(s) + 2H2O(l)--> 2NaOH(aq) + H2(g) 10. Similar to (6) of your previous question; the ions swap around.Silver nitrate = AgNO3; sodium chromate =Na2CrO4         AgNO3 +Na2CrO4 --> Ag2CrO4+ NaNO3     Now balance it:         2AgNO3(aq) +Na2CrO4(aq) -->Ag2CrO4(s) + 2NaNO3(aq) 11. Zinc dissolves in hydrochloric acid to produce hydrogengas:     Zn(s) + HCl(aq) --> ZnCl2(aq) +H2(g)   (or Zn2+(aq) +2Cl-(aq) + H2(g)) 14. Unlike hydrocarbon combustion reactions, metal combustionreactions often produce oxides. For magnesium:       Mg + O2 --> MgO     Balance the reaction:         2Mg + O2--> 2MgO 15. Rust is iron hydroxide, produced by the reaction of elementaliron with water and oxygen. There are many, many reactionsassociated with rusting iron, so here's one version. First, solidiron is oxidised to form aqueous iron ions (note, all of thesereactions are reversible, equilibrium reactions, eventhrough I'm writing them with a weird arrow):     Fe(s) Fe2+(aq) +2e-          (*) These electrons migrate through the iron (which is a good conductorof electricity) to the edge of the water droplet (i.e, at theinterface of water and oxygen), where they react to producewater:     4e- + 4H+(aq) +O2(g) 2H2O(l) Water dissociates to give hydroxide ions:     H2O(l) H+ +OH-   (**) These hydroxide ions are used to produce rust by 2 differentreactions:     (1) Reaction of Fe2+ from (*) withOH- from (**):          Fe2+(aq) + OH-(aq) -->Fe(OH)2(s)     (2) Reduction of Fe2+ toFe3+, which also reacts with OH- ions:          Fe2+(aq) + 4H+(aq) + O2(aq) -->4Fe3+(aq) + 2H2O(l)          Fe3+(aq) + 3OH-(aq) -->Fe(OH)3(s)

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