Zadania z chemii IB HL

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 statement correctly describes a type of electrochemical cell? A. A secondary cell operates as a voltaic cell when discharging and as an electrolytic cell when it is recharged B. A primary (voltaic) cell converts electrical energy into chemical energy C.…

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

A voltaic cell is made by connecting a manganese half-cell ($\ce{Mn(s)}$ in $\ce{Mn^2+(aq)}$) and a tin half-cell ($\ce{Sn(s)}$ in $\ce{Sn^2+(aq)}$) under standard conditions. $\ce{Mn^2+(aq) + 2e- <=> Mn(s)}$ $E^\ominus = -1.18\ \mathrm{V}$…

A student placed strips of the metals L, M and N in aqueous solutions containing the ions $\ce{M^2+}$, $\ce{N^2+}$ and $\ce{L^2+}$ respectively, as shown. The observations are given under each beaker. What is the order of increasing reactivity of the three…

Which of the following is a correct description of the standard hydrogen electrode (SHE)? A. Hydrogen gas at 100 kPa is bubbled through a $1.0\ \mathrm{mol\,dm^{-3}}$ solution of sodium hydroxide B. Its electrode potential of 0.00 V is assigned by convention,…

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. •$\ce{CBrClF2}$

A concentrated aqueous solution of potassium bromide is electrolysed between inert electrodes. Which products are mainly formed at the anode and at the cathode? A. Anode: $\ce{O2}$, cathode: $\ce{H2}$ B. Anode: $\ce{O2}$, cathode: $\ce{K}$ C. Anode:…

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 $\ce{HBr}$,…