... tube number Observations Conclusion 1 Nothing happened No hydrogen present 2 Nothing happened No hydrogen present 3 Nothing happened No hydrogen present 4 Slight 'pop' noise Little hydrogen present 5 Louder 'pop' Hydrogen present 6 'pop' and flame Hydrogen present 7 'pop' and flame Hydrogen present 8 'pop' and flame Hydrogen present As you can see we collected 8 test tubes of the gas given off and five of them turned out to be positive in the hydrogen test therefore we can safely say that hydrogen was a gas present in the gases we collected. The next test was to investigate if there was an alkene present, and since cracking produces an alkene if the test is positive then it reflects a successful 'crack'. The process to discover if an alkene is present is once again quite simple. We added three or four drops of bromine solution to the gas, replaced the stopper on the test tube and shook it for about 10 seconds. If the solution went see-through or clear then an alkene ...

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