This clear, classroom-ready Organic Chemistry Practicals poster brings together two important observations and tests involving hydrocarbons.

The resource covers:

Combustion of hydrocarbons – showing how increasing carbon content generally produces a smokier, sootier flame. Butane, heptane and decane are compared visually, supported by percentage-carbon data.
The bromine water test for unsaturation – comparing cyclohexane and cyclohexene and clearly showing the observations before and after shaking.
The formation of two liquid layers, explained using the different densities of water, cyclohexane and cyclohexene.
The behaviour of bromine in cyclohexane, where no reaction occurs but bromine preferentially dissolves in the organic layer.
The reaction of bromine with cyclohexene, resulting in decolourisation due to reaction at the C=C double bond.
Structural formulae and concise explanations linking the practical observations to saturated and unsaturated hydrocarbons.

Designed as a visual aid/display resource, this poster is suitable for GCSE and A-level Chemistry, particularly when teaching hydrocarbons, alkanes, alkenes, combustion and qualitative organic tests.

Useful for classroom display, practical preparation, revision, or as a visual summary after completing the experiments.