Zadania z chemii IB SL

Which two functional groups occur in both molecule P and molecule Q? A. Amino and a benzene ring B. Hydroxyl and ester C. Hydroxyl and a benzene ring D. Amino and hydroxyl

Which pair of elements would react together most vigorously? A. $\ce{Na(s)}$ and $\ce{I2(s)}$ B. $\ce{Cs(s)}$ and $\ce{I2(s)}$ C. $\ce{Na(s)}$ and $\ce{F2(g)}$ D. $\ce{Cs(s)}$ and $\ce{F2(g)}$

A liquid fuel was burned in a spirit burner and the heat released was used to warm water in a metal calorimeter, as shown. Quantity Value Amount of fuel burned 0.0250 mol Mass of water 150 g Initial temperature of water 19.5 °C Final temperature of water 31.5…

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…

Sulfur has different oxidation states in hydrogen sulfide, $\ce{H2S}$, and in sulfurous acid, $\ce{H2SO3}$. Which pair of values is correct? A. $\ce{H2S}$: +2; $\ce{H2SO3}$: +4 B. $\ce{H2S}$: −2; $\ce{H2SO3}$: +6 C. $\ce{H2S}$: −2; $\ce{H2SO3}$: +4 D.…

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

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…

A chemical reaction occurs in a mixture that starts at the same temperature as its surroundings. Immediately after the reaction, the mixture is warmer than before. Which row correctly describes the energy changes in the system and in the surroundings as the…

What are the limiting reactant and the theoretical yield of hydrogen when 0.30 mol of aluminium reacts with 0.60 mol of hydrochloric acid? $\ce{2Al(s) + 6HCl(aq) -> 2AlCl3(aq) + 3H2(g)}$ In each option the limiting reactant is given first and the theoretical…