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As the sodium bicarbonate is heated, grayish cloudy gas is formed. When gas was poured into the test-tube containing limewater, limewater turned cloudy. When the glowing splint was brought near the mouth of the test-tube, nothing happened, and the flame extinguished. When some of the residue was added with 1cm of water and shaken, residue dissolved it became colorless. When some residue was added with 1cm of diluted hydrochloric acid, bubble produced and the residue dissolved. When some residue was added with water and few drops of phenolphthalein, it turned pink.


In Part A, the string has a mass itself but we didn’t measure it, the washers have slightly varied masses, the circles formed when we rotate the instruments are slightly slanted. Movement of hand increases/decreases the speed of the rubber stopper.


In Part B, the string moves around inside the tube, which creates the different radii, and the circles formed when we rotate the instruments are slightly slanted. Also during the rotation, the base (washers) doesn’t stay idle, it moves around, which makes the Fg different.


During rotations, human being can’t be exact. It is hard to keep the speed constant, also the hand is moving around to make it rotating. Also when we measure the number of rotations and the time, it is not exact since when we count the number of rotations, we may miss some fraction of rotate, and when we measure the time, we may not start at the exact time, and not press the finish button at the exact time.


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