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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.
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
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]
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.
With the U.S. government on the verge of a partial shutdown, a timeline of more than 20 closures since 1976.
While they touched on his '80s favorite Dallas and '70s breakout Man from Atlantis, they of course wanted to talk all things Step by Step, too.
The colors of the γ-sesquisulfides are La 2 S 3, white/yellow; Ce 2 S 3, dark red; Pr 2 S 3, green; Nd 2 S 3, light green; Gd 2 S 3, sand; Tb 2 S 3, light yellow and Dy 2 S 3, orange. [60] The shade of γ-Ce 2 S 3 can be varied by doping with Na or Ca with hues ranging from dark red to yellow, [ 49 ] [ 60 ] and Ce 2 S 3 based pigments are used ...
Days before bitter cold descends on the nation’s capital for the inauguration of Donald Trump, Ronald Reagan Washington National Airport has a problem with its heating system in the terminal.