Umiejętności z tego działu sprawdzają 152 zadania wzorowane na arkuszach IB z lat 2022–2026. Dział pojawia się w 40 z 54 arkuszy w bazie.
(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) The surface area of the Salton Sea was…
(b) A variety of ions are dissolved in the water of the Salton Sea. The concentrations of the major ions are shown in the table below, based on two different sources (both scientific journals). (i) Suggest two reasons for the difference in the concentration of…
(c) A simple set-up was used to compare the conductivity of water samples obtained from the Salton Sea at different depths. The following data were obtained: (i) State the independent and the dependent variable in this experiment. (ii) Suggest two variables,…
Identify the independent variable and the dependent variable in this investigation.
State two variables that should have been kept constant in the four runs.
Discuss the range of the independent variable and the quantity of data in this investigation.
Suggest why the light intensity rose during the first minutes of each run.
Suggest how the total quantity of light emitted in each run could be obtained from the graph.
Explain how the rate at which the light intensity was falling after 15 minutes in the 44.8 °C run could be determined from the graph.
The graph shows the maximum rate of decrease in light intensity for each run, plotted against temperature. (i) Draw the best-fit curve on the graph. (ii) Suggest two possible conclusions that can be drawn from the investigation.
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