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Marble chips can be broken up with a hammer and graded into 3 or 4 sizes: (a) coarse
powder; (b) pieces about half the size of a rice grain; (c) pieces as large as rice grains; and
(d) the original lumps of marble chips. Place four 100 X 16 mm test tubes in a stand. Weigh
approximately 2 g of each grade, size, of marble chips and put the four grades separately
into each of the four tubes. Obtain four balloons and blow them up several times to stretch
them. Put 5 mL of bench hydrochloric acid into each of the four balloons and slip the mouth
of the balloon over the top of the tube without letting any acid into the tube. When each
balloon is in place, tip the acid into each test-tube at the same time and observe which
balloon is the fastest and the slowest to be blown up. The smallest should give the carbon
dioxide in the shortest time. Instead of using marble chips you can use granulated zinc. Do
not use metals in powder form because the reaction may be too vigorous and even cause an
explosion. Be careful! This reaction produces hydrogen gas! Instead of collecting the gas in
a balloon or plastic bag, a more accurate method would be to collect the gas in a burette
inverted over water and compare the volume of gas given off in unit time for each grade of
marble chips. Another accurate method is to stand a conical flask containing the marble
chips and acid on a balance and record the loss in mass every half minute. Carbon dioxide is
a heavy gas and most balances will enable the loss in mass to be found as the gas escapes.
sharon kalunda answered the question on April 12, 2019 at 09:10
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