Zadania z chemii IB SL

When $10.0\ \mathrm{cm^3}$ of a gaseous hydrocarbon, $\ce{C_xH_y}$, is burned completely, $70.0\ \mathrm{cm^3}$ of gaseous products is formed. This volume falls to $30.0\ \mathrm{cm^3}$ when the water vapour condenses. All volumes are measured at the same…

Propane hydrate, $\ce{C3H8.17H2O}$ ($M_r = 350$), is a crystalline solid that can form in natural gas pipelines at low temperature. What mass of carbon dioxide is produced by the complete combustion of 17.5 g of propane hydrate? A. 2.20 g B. 6.60 g C. 17.5 g…

The diagram shows the energy profile of a reaction. P, Q and R are energies measured from the baseline of the potential energy axis. Which combination gives the activation energy of the forward reaction and the activation energy of the reverse reaction? A.…

The rate of the reaction between hydrogen and iodine vapour increases markedly when the temperature is raised from 500 K to 550 K. What is the main reason for this increase? A. The activation energy of the reaction is lowered. B. Molecules collide more…

What is the equilibrium constant expression for the following reaction? $\ce{CH4(g) + H2O(g) <=> CO(g) + 3H2(g)}$ A. $\dfrac{[\ce{CH4}][\ce{H2O}]}{[\ce{CO}][\ce{H2}]^3}$ B. $\dfrac{3[\ce{CO}][\ce{H2}]}{[\ce{CH4}][\ce{H2O}]}$ C.…

Which reactions involve the transfer of a proton? I. $\ce{H2SO4(aq) + Zn(OH)2(s) -> ZnSO4(aq) + 2H2O(l)}$ II. $\ce{H2SO4(aq) + ZnCO3(s) -> ZnSO4(aq) + H2O(l) + CO2(g)}$ III. $\ce{H2SO4(aq) + Zn(s) -> ZnSO4(aq) + H2(g)}$ A. I and II only B. I and III only C. II…

Calcium hydride is used as a portable source of hydrogen for fuel cells. It reacts with water as shown. $\ce{CaH2(s) + 2H2O(l) -> Ca(OH)2(aq) + 2H2(g)}$ Which statement is correct? A. Calcium is reduced from +2 to 0. B. Hydrogen in $\ce{CaH2}$ is oxidized from…

In a redox titration, dichromate(VI) ions are reduced to chromium(III) ions and iron(II) ions are oxidized to iron(III) ions. $\ce{Cr2O7^2-(aq)}$ reduced to $\ce{Cr^3+(aq)}$ $\ce{Fe^2+(aq)}$ oxidized to $\ce{Fe^3+(aq)}$ What volume, in $\mathrm{cm^3}$, of…

What is the organic product of the reaction of 2-bromobutane with aqueous potassium hydroxide? A. but-1-ene B. butan-1-ol C. butan-2-ol D. 2-bromobutan-2-ol