Zadania z chemii IB HL

Znalezionych zadań: 13

Filtry i umiejętności1

(e) The propanoic acid obtained by the distillation was an aqueous solution with a volume of 22.5 $\mathrm{cm^3}$

. Three 5.00

\mathrm{cm^3}

samples of this solution were titrated with 0.200

\mathrm{mol\,dm^{-3}}

\ce{NaOH}

to determine the accurate…

(i) Suggest, giving a reason for each, two different safety precautions that should be taken when carrying out either of these preparations. (ii) Deduce the coefficients needed to balance the following equation for the reaction of silver with concentrated…

Gallium forms a sulfate of formula $\ce{Ga2(SO4)3}$ . (i) Both ionic and covalent bonding are present in this compound. State which particles are held together by each type of bond. (ii) Contrast covalent and ionic bonds in terms of what happens to the valence…

What volume of propane gas, in $\mathrm{cm^3}$ , must be burned completely in oxygen to give 90 $\mathrm{cm^3}$ of carbon dioxide, all volumes being measured at the same temperature and pressure? $\ce{C3H8(g) + 5O2(g) -> 3CO2(g) + 4H2O(g)}$ A. 18 B. 30 C. 90 D.…

A chemist treated 22.99 g of galantamine with sulfuric acid to make the sulfate salt: $\ce{2C17H21NO3 + H2SO4 -> (C17H22NO3)2SO4}$ The mass of salt isolated was 24.65 g. Determine the percentage yield of the salt. Use section 7 of the data booklet.

What amount of oxygen, in mol, is required to burn 8.72 g of butane, $\ce{C4H10(g)}$ , completely? $M$ (butane) = 58.14 $\mathrm{g\,mol^{-1}}$ A. 0.0231 B. 0.150 C. 0.975 D. 1.95

(i) If the reaction has a percentage yield of 80 %, calculate the mass, in g, of benzene that would be produced from 2.0 kg of cyclohexane. (ii) Calculate the atom economy for this reaction, as a percentage.

Sucrose, $\ce{C12H22O11}$ , is hydrolysed with excess water and the glucose formed is then fermented. $\ce{C12H22O11(aq) + H2O(l) -> 2C6H12O6(aq)}$ $\ce{C6H12O6(aq) -> 2C2H5OH(aq) + 2CO2(g)}$ $M_\mathrm{r}$ of $\ce{C12H22O11}$ = 342.34 $M_\mathrm{r}$ of…

Equal volumes of nitrogen and hydrogen are mixed and react according to the equation below. The volumes of the two reactants are measured at intervals. $\ce{N2(g) + 3H2(g) -> 2NH3(g)}$ Which graph shows how the volumes of the two reactants change with time? A.…

What volume of hydrogen, in $\mathrm{cm^3}$ , is produced at STP when 0.810 g of aluminium reacts with an excess of hydrochloric acid? $\ce{2Al(s) + 6HCl(aq) -> 2AlCl3(aq) + 3H2(g)}$ Molar volume of an ideal gas at STP = 22.7 $\mathrm{dm^3\,mol^{-1}}$ A. 341 B.…