Halogen Adsorption on CeO2: The Role of Lewis Acid–Base Pairing

2012 ◽  
Vol 116 (11) ◽  
pp. 6664-6671 ◽  
Author(s):  
Zhenpeng Hu ◽  
Horia Metiu
Keyword(s):  
Lewis Acid ◽  
Base Pairing ◽  
Acid Base

Proton-Transfer and H2-Elimination Reactions of Trimethylamine Alane: Role of Dihydrogen Bonding and Lewis Acid−Base Interactions

2009 ◽  
Vol 48 (8) ◽  
pp. 3667-3678 ◽  
Author(s):  
Oleg A. Filippov ◽  
Victoria N. Tsupreva ◽  
Lyudmila M. Golubinskaya ◽  
Antonina I. Krylova ◽  
Vladimir I. Bregadze ◽  
...  
Keyword(s):  
Proton Transfer ◽  
Lewis Acid ◽  
Acid Base ◽  
Dihydrogen Bonding ◽  
Elimination Reactions ◽  
Trimethylamine Alane ◽  
H2 Elimination

Analysis of the role of a writing-to-learn assignment in student understanding of organic acid–base concepts

2019 ◽  
Vol 20 (2) ◽  
pp. 383-398 ◽  
Author(s):  
Jennifer A. Schmidt-McCormack ◽  
Jessyca A. Judge ◽  
Kellie Spahr ◽  
Ellen Yang ◽  
Raymond Pugh ◽  
...  
Keyword(s):  
Treatment Group ◽  
Peer Review ◽  
Lewis Acid ◽  
Comparison Group ◽  
Writing To Learn ◽  
Chemistry Curriculum ◽  
Acid Base ◽  
External Assessment ◽  
Writing Assignment

Acid–base chemistry is a foundational topic that is taught in courses across the chemistry curriculum. Students often have difficulty distinguishing between the different theories of acid–base chemistry—Brønsted–Lowry and Lewis acid–base chemistry—and applying these two definitions correctly in unfamiliar scenarios. To help students learn these definitions and be able to apply them, an acid–base Writing-to-Learn assignment was developed and evaluated. The Writing-to-Learn assignment involved a three-step process where students constructed an initial draft in response to a writing prompt, participated in peer review, and made revisions based on peer review feedback, before submitting a final draft. This process is informed by sociocultural theory applied to writing, which states that student learning of concepts increases through engagement with their peers’ work and receiving peer feedback on their own writing. To test the efficacy of the acid–base writing assignment, an external assessment, comprised of conceptual questions related to acid–base chemistry and students’ confidence when responding to them, was administered in two groups; a treatment group who completed the Writing-to-Learn assignment, and a comparison group who completed a separate assignment. Additionally, students who completed the Writing-to-Learn assignment were interviewed about their experiences. Regression analysis revealed that students in the treatment group had a greater increase in their conceptual understanding and confidence as compared to the students in the comparison group. The results demonstrate the students could successfully write about the Brønsted–Lowry and Lewis acid–base models separately, but were less successful with connecting these two concepts together in their writing. These results demonstrate the efficacy of Writing-to-Learn as an approach for promoting conceptual learning of acid–base chemistry.

The role of Lewis acid–base pair sites in ZnO–ZnCr2O4 catalysts for cyclization via dehydrogenative condensation of crude glycerol and 1,2-propanediamine for the synthesis of 2,6-dimethylpyrazine

2017 ◽  
Vol 41 (18) ◽  
pp. 9875-9883 ◽  
Author(s):  
Krishna Vankudoth ◽  
A. Hari Padmasri ◽  
Reema Sarkari ◽  
Vijay Kumar Velisoju ◽  
Naresh Gutta ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Base Pair ◽  
Spectroscopic Data ◽  
Crude Glycerol ◽  
Acid Sites ◽  
Acid Base ◽  
Lewis Acid Sites

DRIFT spectroscopic data revealed the role of surface Lewis acid sites on the synthesis of 2,6-dimethylpyrazine.

Hydrophobic Protein−Polypyrrole Interactions:  The Role of van der Waals and Lewis Acid−Base Forces As Determined by Contact Angle Measurements

Langmuir ◽  
2002 ◽  
Vol 18 (4) ◽  
pp. 1150-1156 ◽  
Author(s):  
Ammar Azioune ◽  
Mohamed M. Chehimi ◽  
Beata Miksa ◽  
Teresa Basinska ◽  
Stanislaw Slomkowski
Keyword(s):  
Contact Angle ◽  
Lewis Acid ◽  
Van Der Waals ◽  
Acid Base ◽  
Hydrophobic Protein ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Base Forces
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