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During your practical work you performed a first-hand investigation to distinguish between an alkene and the corresponding alkane - HSC - SSCE Chemistry - Question 16 - 2005 - Paper 1
Question 16
During your practical work you performed a first-hand investigation to distinguish between an alkene and the corresponding alkane. (a) Name the alkene used in your ... show full transcript
Worked Solution & Example Answer:During your practical work you performed a first-hand investigation to distinguish between an alkene and the corresponding alkane - HSC - SSCE Chemistry - Question 16 - 2005 - Paper 1
Step 1
Step 2
Identify a potential hazard in your investigation, and outline how you addressed this hazard.
Answer
A potential hazard in the investigation was the flammability of the alkene, ethene. To address this hazard, I conducted the experiment in a well-ventilated fume hood and made sure to keep any sources of ignition away from the working area.
Step 3
Outline the procedure you used for your first-hand investigation.
Answer
To distinguish between the alkene and the corresponding alkane, I performed a qualitative test using bromine water. I added a few drops of bromine water to the sample. The solution containing the alkene turned from brown to colorless, indicating the presence of a double bond. In contrast, the alkane showed no color change.