A student investigates the rate at which hydrogen gas is made when magnesium ribbon reacts with dilute ethanoic acid at two different temperatures. Instructions The student does two experiments using the apparatus shown in Fig. 2.1. Fig. 2.1 Experiment 1 - Use a measuring cylinder to pour $$\(50 \mathrm{~cm}^{3}\)$$ of dilute ethanoic acid into a conical flask. - Use a thermometer to measure the initial temperature of the dilute ethanoic acid and record the initial temperature. - $$\(\quad\)$$ Set the apparatus up as shown in Fig. 2.1, ensuring the inverted measuring cylinder is full of water. - Remove the bung from the conical flask, ensuring the delivery tube remains in the measuring cylinder. - Add a coil of magnesium ribbon to the conical flask, immediately put the bung back into the conical flask and start the timer. If the magnesium sticks to the side of the flask, gently shake the flask so that it is washed off the side. - Measure the volume of gas collected in the inverted measuring cylinder every 15 seconds for 150 seconds. Record the volume of gas collected. - Use the thermometer to measure the final temperature of the mixture in the conical flask and record the final temperature. - Rinse out the conical flask with distilled water. Experiment 2 - Repeat Experiment 1 but warm the acid by about $$\(15^{\circ} \mathrm{C}\)$$ after it has been poured into the conical flask and before the initial temperature is measured and recorded. Use Fig. 2.2 to explain which experiment had the faster rate of reaction. experiment with faster rate .................................................................................................... explanation ............................................................................................................................ ................................................................................................................................................ .

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