Zadania z chemii IB HL

What is the coefficient of oxygen when the equation for the complete combustion of butan-1-ol is balanced using the smallest whole numbers? The unbalanced equation is $\ce{C4H9OH + O2 -> CO2 + H2O}$. A. 4 B. 6 C. 7 D. 13

Which row correctly describes an endothermic reaction? A. The temperature of the surroundings rises and the products are more stable than the reactants. B. The temperature of the surroundings falls and the products are more stable than the reactants. C. The…

What is a limitation of infrared (IR) spectroscopy in determining the structure of an organic compound? A. The sample is destroyed during the analysis B. Structural isomers containing the same functional groups give very similar spectra C. It cannot detect…

Which change results in a decrease in entropy? A. $\ce{2NaHCO3(s) -> Na2CO3(s) + H2O(g) + CO2(g)}$ B. $\ce{I2(s) -> I2(g)}$ C. $\ce{CO(g) + 2H2(g) -> CH3OH(l)}$ D. $\ce{KNO3(s) -> KNO3(aq)}$

When 0.601 g of propan-1-ol is burned, the heat released raises the temperature of 250 $\mathrm{cm^3}$ of water by 8.00 K. What is the enthalpy of combustion of propan-1-ol, in $\mathrm{kJ\,mol^{-1}}$, calculated from these results? Specific heat capacity of…

Which equation represents both the standard enthalpy of formation, $\Delta H_\mathrm{f}^\ominus$, of a compound and the standard enthalpy of combustion, $\Delta H_\mathrm{c}^\ominus$, of an element? A. $\ce{C(s) + 1/2 O2(g) -> CO(g)}$ B.…

Which condition applies to a reaction mixture that has reached equilibrium at constant temperature and pressure? A. $\Delta H = 0$ B. $\Delta G = 0$ C. $K = 1$ D. $\Delta S_\text{system} = 0$

The diagram shows an energy cycle for the formation of solid potassium bromide from its elements. Which energy change in the cycle represents the first ionization energy of potassium? A. $\Delta H_2$ B. $\Delta H_4$ C. $\Delta H_5$ D. $\Delta H_6$