IGCSE Science - Combined (0653) — May–June 2023, Paper 42

Fig. 1.1 describes some feeding relationships in an ecosystem: fruit flies eat mango fruit; thrushes eat fruit flies; eagles eat thrushes. Draw a food chain using the information…

Concentrated aqueous sodium chloride is electrolysed using platinum electrodes (Fig. 2.1, gas X at the positive electrode). At the start of the electrolysis, the aqueous solution…

Fig. 3.1 shows a speed–time graph for a car on a journey (speed / m/s against time / s; axis 0,20,40,60,80). Describe the motion of the car for the first 10 s of its journey.

Fig. 4.1 shows a student's diagram of a cross-section through a leaf with parts labelled A, B, C, D, E. Complete Table 4.1 (letter name of part function). Given rows: A ?…

A student does five experiments on the reaction between magnesium and dilute hydrochloric acid, measuring the volume of gas given off in the first 10 s (Fig. 5.1, gas syringe).…

The Sun is the source of energy for most of our energy resources. State the source of the Sun's energy.

Fig. 7.1 shows the gas exchange surface in humans (capillary wall, wall of alveolus, red blood cells, direction of oxygen movement). State the name of the process by which oxygen…

Cracking decane, C10H22, forms three compounds (Fig. 8.1): pentane (C5H12), propene (C3H6) and ethene (C2H4). State which two compounds in Fig. 8.1 are alkanes. Give a reason for…

Fig. 9.1 shows a circuit diagram for an electric doorbell (6.0 V battery, bell push switch, electric bell and a lamp). A p.d. of at least 6.0 V is needed to make the bell ring and…