Lesson 3: Precipitation Reactions. A precipitation reaction is a reaction in which soluble ions in separate solutions are mixed together to form an insoluble compound that settles out of solution as a solid.That insoluble compound is called a precipitate.Solubility Rules for Ionic Compounds.esson 3: Precipitation Reactions. A precipitation reaction is a reaction in which soluble ions in separate solutions are mixed together to form an insoluble compound that settles out of solution as a solid. That insoluble compound is called a precipitate. Solubility Rules for Ionic Compounds.
The finding that extrinsic rewards can undermine intrinsic motivation has been highly controversial since it first appeared (Deci, 1971).
Undermining children's intrinsic interest with extrinsic rewards: A test of the overjustification hypotnesis. Joumnal of Personalitv a.ne Social Psvchologv 28 129- 137.Lopper, M. R., Keavney, M. & Drake, M. (1996). intrinsic motivation and extrinsicrewards: A comnnentary on Cameron and Pierce's meta-atalysis.