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Due to the large size of the La 3+ ion, La 2 O 3 adopts a hexagonal 7-coordinate structure that changes to the 6-coordinate structure of scandium oxide (Sc 2 O 3) and yttrium oxide (Y 2 O 3) at high temperature. When it reacts with water, lanthanum hydroxide is formed: [37] a lot of heat is evolved in the reaction and a hissing sound is heard
Course Hero acquired Symbolab, a mathematics problem solver, in October 2020, and acquired LitCharts, a literature guide resource, in June 2021. Terms of these acquisitions were not disclosed. [7] [8] In December 2021, the company received a $380 million Series C at a $3.6 billion valuation.
Lanthanum hydroxide does not react much with alkaline substances, however is slightly soluble in acidic solution. [2] In temperatures above 330 °C it decomposes into lanthanum oxide hydroxide (LaOOH), which upon further heating decomposes into lanthanum oxide (La 2 O 3): [4]
Lanthanum oxide is used in optical materials; often the optical glasses are doped with La 2 O 3 to improve the glass' refractive index, chemical durability, and mechanical strength. [8] 3 B 2 O 3 + La 2 O 3 → 2 La(BO 2) 3 [clarification needed] The addition of the La 2 O 3 to the glass melt leads to a higher glass transition temperature from ...
Lanthanum(III) iodate can disproportionate and decompose to a periodate when heated: [2] 10 La(IO 3) 3 → 2 La 5 (IO 6) 3 + 12 I 2 ↑ + 27 O 2 ...
Data from flight tracker FlightAware showed a plane leaving the small airport at 2:07 p.m. before its flight ended at 2:09 p.m., which is the time that police said they received a notification ...
A course evaluation is a paper or electronic questionnaire, which requires a written or selected response answer to a series of questions in order to evaluate the instruction of a given course. The term may also refer to the completed survey form or a summary of responses to questionnaires.
Following a wild conference championship game weekend, Dan Wetzel, Ross Dellenger and SI's Pat Forde hop on to discuss the outcome of the final College Football Playoff rankings.