Marble Chip Lab Report

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On-line Science Simulations - Marble Chip Student Worksheet When hydrochloric acid is added to calcium carbonate (marble chips) carbon dioxide is evolved. In the experiment shown, 21.6 g of calcium carbonate is added to 200 cm3 of hydrochloric acid. The number of chips can be varied but the total mass is always 21.6 g and the volume of acid is always 200 cm3 but the concentration can be varied. The apparatus is placed on a balance that has been zeroed so that it always shows the same initial mass at the start of the experiment. During the reaction, carbon dioxide is evolved and the mass decreases. Task 1 Choose 1 marble chip and an acid concentration of 1.0 mol/dm3 . Click start and take readings approximately every 5 seconds (by clicking…show more content…
Suggest two reasons for this change. Task 2 Press back but not clear and change the number of chips to 10 but leave the acid concentration at 1.0 mol/dm3 . Click start and take readings approximately every 3 seconds (by clicking the take readings button) until the mass reaches 0.0 g. Stop the reaction immediately. Plot these results on the same grid as the results of your first experiment. How does the rate of reaction in Task 2 compare with the rate in Task 1? Suggest a reason for the change. By comparing the two curves and the times taken to reach 0.0 g (the last times on the list), predict the time it would take for the reaction to finish if 100 chips were used. Task 3 Press back but not clear and change the number of chips to 100 but leave the acid concentration at 1.0 mol/dm3 . Click start and take readings as often as possible (by clicking the take readings button) until the mass reaches 0.0 g. Stop the reaction immediately. Plot your results on the same grid as the previous two experiments. How long did it actually take for the reaction to finish? www.XtremePapers.comClear all the results by clicking clear. Repeat Task

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