Zadania z chemii IB SL

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Nitrogen gas is reacted with excess hydrogen gas to produce ammonia. $\ce{N2(g) + 3H2(g) -> 2NH3(g)}$

The reaction of 28.0 g of

\ce{N2}

with excess

\ce{H2}

produces 25.5 g of

\ce{NH3}

. What is the percentage yield of

\ce{NH3}

? A. 25% B. 50% C. 75% D.…

The dotted line shows the volume of hydrogen produced when an excess of magnesium ribbon is added to 50 $\mathrm{cm^3}$ of 2.0 $\mathrm{mol\,dm^{-3}}$ hydrochloric acid. Which curve shows the volume of hydrogen produced when the same excess of magnesium ribbon…

Which reaction has the lowest activation energy? A. $\ce{HBr(g) -> H(g) + Br(g)}$ B. $\ce{2Cl(g) -> Cl2(g)}$ C. $\ce{CH4(g) + Cl(g) -> CH3(g) + HCl(g)}$ D. $\ce{HBr(g) -> H+(g) + Br-(g)}$

Which statement explains why a chemical equilibrium is described as dynamic? A. The forward and reverse reactions continue to take place at equal rates. B. The concentrations of the reactants and products keep changing until the reaction stops. C. The position…

In which reaction does water behave as a Brønsted–Lowry acid? A. $\ce{H2O(l) + HCl(g) -> H3O+(aq) + Cl-(aq)}$ B. $\ce{H2O(g) + SO3(g) -> H2SO4(l)}$ C. $\ce{2H2O(l) -> 2H2(g) + O2(g)}$ D. $\ce{H2O(l) + NH3(aq) -> NH4+(aq) + OH-(aq)}$

Which compounds are oxidized when heated with acidified potassium dichromate(VI) solution? I. $\ce{CH3CH2C(CH3)2OH}$ II. $\ce{(CH3)2CHCH2OH}$ III. $\ce{CH3CH(OH)CH3}$ A. I and II only B. I and III only C. II and III only D. I, II and III

Magnesium is a stronger reducing agent than lead. A voltaic cell is constructed using magnesium and lead electrodes dipped into solutions of their respective ions, $\ce{Mg^2+ (aq)}$ and $\ce{Pb^2+ (aq)}$ , of equal concentrations. What is correct when the…

Which half-equation represents the reduction of sulfuric acid to sulfur dioxide in acidic solution? A. $\ce{H2SO4 + 2H+ + 2e- -> SO2 + 2H2O}$ B. $\ce{H2SO4 + 4H+ + 4e- -> SO2 + 2H2O}$ C. $\ce{H2SO4 + 2H2O -> SO2 + 6H+ + 2e-}$ D.…

Which radical is most likely to form when one covalent bond in bromochlorodifluoromethane, $\ce{CBrClF2}$ , is broken by ultraviolet light in the upper atmosphere? A. • $\ce{CBrF2}$ B. • $\ce{CClF2}$ C. • $\ce{CBrClF}$ D. • $\ce{CBrClF2}$

Pent-2-ene undergoes a range of addition reactions. Which reagent and product are correctly matched? A. Reagent $\ce{H2}$ , product pent-1-ene B. Reagent $\ce{Br2}$ , product 2,3-dibromopentane C. Reagent $\ce{H2O}$ , product pentan-1-ol D. Reagent $\ce{HBr}$ ,…