Unsaturated fats change bromine water from orange to colourless. How?
Unsaturated fats usually have a C=C double bond, e.g. vegetable oil. So, it's 'unstable' because of the high concentration of negative charge (electrons). Bromine (B2) is not polarised. However, as it approaches the double bond, it polarises. We can this a permanent dipole to induced dipole reaction. Bromine than attaches to the hydrocarbon creating halogenated hydrocarbons (Bromine is a halogen). Since bromine is added on, we call this an addition reaction. This helps separate alkanes from alkenes. Diagram will help explain.
AC
Related Chemistry A Level answers
All answers ▸What does Le Chatelier's principle say happens to an equilibrium when temperature is changed or a catalyst is added?
Compare the structures of Diamond and Graphite, making references to the bonding, the shape of the structures, and location of the electrons within the structures. Account for the fact that graphite conducts electricity and diamond does not.
What is Entropy?
Explain what is meant by the term 'buffer solution' and give an example of a biological buffer system.