IGCSE Science - Combined (0653) — October–November 2024, Paper 43
9 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Fig. 1.1 shows a food web. Leaves are eaten by the caterpillar. Grass is eaten by the rabbit and the grasshopper. The snake, hawk, owl and blue jay are higher in the web. The…
Answer this question and get it marked →(a) Excess solid zinc is added to dilute hydrochloric acid in a conical flask. (a)(i) Complete the equation for the reaction. Zn(s) + ......HCl(aq) → ZnCl2(aq) + ......(g)
Answer this question and get it marked →(a) Complete the sentences about sound. Use one word or a number in each gap. Sound is produced by ............ sources. The healthy human ear can hear frequencies of sound…
Answer this question and get it marked →(a) The photosynthesis reaction in plants is controlled by enzymes. (a)(i) The rate of photosynthesis in a submerged aquatic plant is measured by counting the number of gas…
Answer this question and get it marked →Dilute sulfuric acid is electrolysed using inert electrodes as shown in Fig. 5.1 (positive electrode and negative electrode in dilute sulfuric acid, connected to a d.c. power…
Answer this question and get it marked →Fig. 6.1 shows an ox pulling a plough along horizontal ground. (a) Fig. 6.2 shows a speed–time graph for the motion of the ox and plough on one journey (speed rises to 0.40 m/s by…
Answer this question and get it marked →(a) Fig. 7.1 shows a diagram of the double circulatory system in humans (with lungs at the top, the heart in the middle, and the rest of the body at the bottom; the arrows show…
Answer this question and get it marked →(a) The formula for methanol is CH3OH. Complete the dot-and-cross diagram in Fig. 8.1 to show the bonding in methanol. Show outer-shell electrons only. (Fig. 8.1 shows a central…
Answer this question and get it marked →(a) State the name of the component with the electrical symbol shown (a rectangle with a line through it).
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