Record qualitative and quantitative data in tables with headings and units, process them with correct significant figures and uncertainties, and present them in graphs that support the conclusion.
(a) The graph shows how the water level of the Salton Sea has changed since 1950. The reference point for the water level is sea level. (i) Suggest a reason why the values plotted on the vertical axis are negative. (ii) Describe the general trend in the rate…
Explain how the calibration curve is then used to determine the concentration of in a reaction mixture of unknown concentration.
Each student used a different mass of the hydrated salt. The results of the whole class are shown below ( of = 18.02). Student Mass of / g Mass of / g Loss in mass / g Amount of / mol Amount of…
Bathers release nitrogen-containing compounds, including ammonia, into the pool water. Ammonia reacts with hypochlorous acid to form chloramines. (i) Deduce an equation for the reaction of ammonia with hypochlorous acid that forms trichloramine,…
The following burette readings are recorded in one of the titrations. Final burette reading = 26.15 ± 0.05 Initial burette reading = 1.15 ± 0.05 Calculate the percentage uncertainty in the titre volume.
Use the volumes collected at 120 s in Experiment 1 and Experiment 3 to calculate by what percentage the final volume of carbon dioxide falls for each 100 g added to the piston.