Zadania z chemii IB HL

Sketch how the combined mass of the flask, the syringe and their contents would change with time during Experiment 1, and give a reason for the shape of your sketch. Label the axes 'Total mass' and 'Time'.

Below is a sodium-ion cell as it discharges, supplying a current to an external circuit. The anode is sodium held in a lattice of hard carbon and the cathode is iron(III) phosphate, $\ce{FePO4}$, which is converted to $\ce{NaFePO4}$ as the cell discharges.…

When the cell discharges, a spontaneous redox reaction generates a potential difference between the electrodes and the temperature of the cell rises. (i) Deduce the signs of $\Delta H_\mathrm{discharge}$, $E_\mathrm{cell}$ and $\Delta G_\mathrm{discharge}$.…

A computer simulation models what happens when small pieces of lithium and of sodium are dropped into water. For each metal five pieces of increasing mass are used, the same set of masses for both metals, and the simulation records how long each piece takes to…

A cylinder contains 80 g of argon and 12.0 g of helium. What is the ratio of the number of argon atoms to the number of helium atoms in the cylinder? A. 0.15 B. 0.67 C. 1.5 D. 6.7

A small volume of $0.050\ \mathrm{mol\,dm^{-3}}$ hydrobromic acid is placed in a beaker fitted with a pH probe. Distilled water is then run into the beaker at a constant rate and the pH is logged continuously; the temperature is held at 298 K. (i) Sketch, on…

Chloride ions can act as ligands towards transition metal ions. Three compounds of chromium that differ in the number of chloride ions bonded directly to the chromium ion have the formulas and colours shown. Compound Colour $\ce{[Cr(H2O)6]Cl3}$ violet…

A rigid cylinder of fixed volume contains an ideal gas at 250 K and a pressure of 75 kPa. One third of the gas molecules are released, and the temperature of the remaining gas is raised to 500 K. What pressure, in kPa, does the gas now have? A. 50 B. 100 C.…