Salt: Salt and Ice

Salt is routinely used to melt snow and ice on winter roads. But what is happening at the molecular level to cause this helpful change of state? Chemistry - Atoms And Bonding - Learning Points. When salt is added to water it lowers the freezing point. Spreading salt on roads causes the ice to melt. Salt weakens the rigid lattice structures of ice and the molecules become disordered. Salt becomes less effective if temperatures fall below -7 degrees Celsius. A Twig Context Film. Reinforce and extend the learning required by the curriculum. Twig’s context films show abstract concepts in action in the real world.