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Golden rain demonstration is made by combining two colorless solutions, potassium iodide solution and Lead(II) nitrate solution at room temperature to form yellow precipitate. During the chemical reaction, golden particles gently drop from the top of Erlenmeyer flask to the bottom, similar to watching the rain through a window.
Polybenzimidazole (PBI, short for poly[2,2’-(m-phenylen)-5,5’-bisbenzimidazole]) fiber is a synthetic fiber with a very high decomposition temperature. It does not exhibit a melting point , it has exceptional thermal and chemical stability, and it does not readily ignite. [ 1 ]
PbI 2 is commonly synthesized via a precipitation reaction between potassium iodide KI and lead(II) nitrate Pb (NO 3) 2 in water solution: Pb(NO 3) 2 + 2 KI → PbI 2 + 2 KNO 3. While the potassium nitrate KNO 3 is soluble, the lead iodide PbI 2 is nearly insoluble at room temperature, and thus precipitates out. [17]
Positive behavior interventions and supports (PBIS) is a set of ideas and tools used in schools to improve students' behavior.PBIS uses evidence and data-based programs, practices, and strategies to frame behavioral improvement relating to student growth in academic performance, safety, behavior, and establishing and maintaining positive school culture.
In the U.S., the SAT Subject Test in Mathematics Level 2 (formerly known as Math II or Math IIC, the "C" representing the sanctioned use of a calculator), was a one-hour multiple choice test. The questions covered a broad range of topics.
PBI is a team-based organization that uses consensus decision making.It is non-hierarchical in structure. There are three different aspects to the overall PBI structure, which are the Country Groups, the Field Projects, and the International Level (which consists of the PBI General Assembly, the International Council (IC), and the International Operations Council (IOC)).
The Multidimensional Aptitude Battery II is a group-administered intelligence test created by psychologist Douglas N. Jackson which is supposed to measure Verbal, Performance and Full Scale IQ. The battery consists of 10 subtests and is used for various professional, medical, military, government, law enforcement and employment settings.
A PBI must deliver value to the stakeholders. E: Estimable: You must always be able to estimate the size of a PBI. S: Small: PBIs should not be so big as to become impossible to plan/task/order within a level of accuracy. T: Testable: The PBI or its related description must provide the necessary information to make test development possible.