IGCSE Sciences - Co-Ordinated (0654) — 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 an enzyme-controlled reaction. Catalase is an enzyme found inside living cells such as yeast cells. It catalyses the breakdown of hydrogen peroxide,…
Answer this question and get it marked →The pH of saliva in the mouth is approximately 7. Eating and drinking lowers the pH of saliva in the mouth. This can cause tooth decay. Mouthwash is sometimes used to raise the pH…
Answer this question and get it marked →A student investigates the reactivity of metals by measuring how long metal carbonates take to break down and release carbon dioxide when heated. The carbonate of a more reactive…
Answer this question and get it marked →A student investigates the reactivity of metals by measuring the voltage in electrochemical cells. When two different metals are dipped into an aqueous salt solution they produce…
Answer this question and get it marked →A student is given four solutions with labels H, J, K and L. The solutions are: aqueous copper chloride; aqueous zinc chloride; aqueous iron(II) chloride; aqueous magnesium…
Answer this question and get it marked →A student investigates the changes in potential difference V across a length of resistance wire. The student assembles the circuit shown in Fig. 6.1 (an ammeter A, a fixed…
Answer this question and get it marked →A student measures the density of water using two different methods. Method 1: the student measures the mass m1 of an empty measuring cylinder using a top-pan balance. Fig. 7.1…
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