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).
Schools are of particular interest when it comes to intrinsic versus extrinsic motivation, particularly because of the different outcomes that researchers have shown to result from intrinsic motivation: more interest, excitement, confidence, enhanced performance, persistence, creativity, self-esteem and general well-being (In Ryan and Deci, 2000: ...