IGCSE Sciences - Co-Ordinated (0654) — October–November 2024, Paper 51
6 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →You are going to investigate 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 →You are going to investigate the reactivity of metals by measuring when metal carbonates break down and release carbon dioxide when they are heated. The carbonate of a more…
Answer this question and get it marked →You are going to investigate the reactivity of metals by measuring voltages in electrochemical cells. When two different metals are dipped into an aqueous salt solution, they…
Answer this question and get it marked →You are going to investigate the changes in potential difference V across a length of resistance wire in an electrical circuit. Fig. 5.1 shows a circuit with a resistance wire (an…
Answer this question and get it marked →You are going to use two different methods to measure the density of water. Method 1: Record the mass m1 of the empty 100 cm^3 measuring cylinder to the nearest gram.
Answer this question and get it marked →← October–November 2024 Paper 52 · October–November 2024 Paper 43 →