Zadania z chemii IB HL

The electrode potential, $E$, of the $\ce{Sn^4+}/\ce{Sn^2+}$ half-cell is not fixed: it depends on the concentrations of the two tin ions, as given by the equation: $E = 0.15 + \dfrac{RT}{2F}\ln\dfrac{[\ce{Sn^4+}]}{[\ce{Sn^2+}]}$ Determine the electrode…

(i) State the type of reaction taking place, and identify the role played by $\ce{HI}$. (ii) Outline why molecules such as $\ce{HI}$ are able to attack ethene.

(i) Using section 12 of the data booklet, determine the standard enthalpy change of the reaction, in $\mathrm{kJ\,mol^{-1}}$. (ii) A value obtained from bond enthalpies is less accurate than one obtained from enthalpies of formation. State two reasons why.…

Iodoethane can react with aqueous hydroxide ions to produce ethanol. $\ce{CH3CH2I(l) + OH-(aq) -> CH3CH2OH(aq) + I-(aq)}$ (i) State what type of reaction this is. (ii) Using curly arrows to show the movement of electron pairs, sketch the mechanism of this…

Under which conditions does the gas behave most like an ideal gas? A. Helium at 200 kPa and 300 K B. Helium at 20 kPa and 600 K C. Sulfur dioxide at 20 kPa and 600 K D. Sulfur dioxide at 200 kPa and 300 K

(i) In the nickel–metal hydride (NiMH) rechargeable battery the negative electrode is a metal alloy, M, that absorbs hydrogen. The two electrode reactions during discharge are shown below. $\ce{MH(s) + OH-(aq) <=> M(s) + H2O(l) + e-}$…

For a different pair of half-cells, the standard Gibbs energy change, $\Delta G^\ominus$, works out to $-370.6\ \mathrm{kJ\,mol^{-1}}$, with a single electron transferred between the electrodes in the cell reaction. Deduce what these two half-cells are. Use…

In this electrolytic cell, silver ions, $\ce{Ag+(aq)}$, are deposited as silver onto cutlery made of a cheaper metal. Complete the table below, using ticks to show which direction each species moves in and where that movement occurs. Species Direction: towards…

An ideal gas is held in a rigid, sealed container at 27 °C, where its pressure is $P$ Pa. The container is then cooled to −3 °C. Which expression best describes the new pressure of the gas? A. Slightly less than $P$ B. Slightly more than $P$ C. One ninth of…