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Formation of water a powerful exothermic reaction. |
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Obtain a large, empty, coffee tin. Using a screw driver place a hole at the base of the tin. Make sure the lid is tight fitting. |
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Set up the apparatus as shown
on the right. The tube is placed through the hole at the base of the tin. |
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| Hydrogen gas is produced when hydrochloric acid (vinegar will suffice) is poured over zinc metal. The hydrogen finds its way into the tin via the rubber tubing. |  |
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Remove the flask and rubber tubing from the tin. Completely remove the flask from vicinity of the tin. | |
| Use ear and eye protection. |  |
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Use a lit candle
taped to the end of a one metre stick. Place the flame under the hole at
the base of the tin. The explosion that results is powerful, so instruct
students to stand back 8 metres and place their fingers in their ears. |
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Teachers should
conduct this demonstration on there own first before demonstrating to
students. Where the energy for the explosion came from. What
the properties of hydrogen gas are that made it useful for giant air-ships. |
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