IGCSE Sciences - Co-Ordinated (0973) — October–November 2024, Paper 61
7 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →A student investigates how the concentration of hydrogen peroxide affects the height of foam produced when yeast (which contains catalase) is added. Plan a table to record the…
Answer this question and get it marked →A student investigates the effect of adding different volumes of mouthwash on the pH of saliva. Plan an investigation to find out how the volume of mouthwash affects the pH of…
Answer this question and get it marked →A student heats different metal carbonates and records the time for limewater to turn milky, to compare their reactivity. The student uses copper carbonate (Cu) and iron carbonate…
Answer this question and get it marked →A student uses electrochemical cells to compare the reactivity of metals. Table 4.1 shows the voltage produced when each metal is connected with copper. metal voltage (V) -------…
Answer this question and get it marked →A student tests four unknown solutions H, J, K and L. Table 5.1 shows the results of the tests. solution colour flame test NaOH(aq) added excess NH₃(aq) added ---------- --------…
Answer this question and get it marked →A student investigates how the resistance of a wire varies with its length. Fig. 6.1 shows the circuit used. Fig. 6.2 shows the ammeter reading. [Fig. 6.2: Ammeter showing a…
Answer this question and get it marked →A student measures the density of water using two methods. In method 1, the student uses a measuring cylinder and balance. Fig. 7.1 shows the balance reading for the empty…
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