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Answer 1

The experiment is about testing (is aimed to test) the following hypothesis: why the banknote does not burn in ethanol solution. To do this, we are about to conduct three experiments. Let’s set the banknote with different amounts of ethanol in it on fire. 1) 10% - alcohol, 90% - water 2) 94% - alcohol, 6% - water 3) 50% - alcohol, 50% - water.

In the first case, the bill refused to burn. In the second case, the bill is almost completely burned down. In the third case, the bill was covered in flames, but it had not been affected at all. So we can make a conclusion that the water does not allow the banknote to be burned. As the alcohol burns, the water formes the protective layer on the paper, which can not be burned.