This document provides an overview of chemical bonding concepts including the four main types of bonds (ionic, covalent, metallic, and polar covalent) and their properties. It also discusses electronegativity and bond polarity, Lewis structures, the octet rule, valence shell electron pair repulsion theory (VSEPR) and molecular geometry. Hybridization of orbitals is explained using examples of sp, sp2, and sp3 hybridization. The document concludes by noting some exceptions and limitations of the valence bond theory for more complex molecules and transition metals.
It is about molecular orbital theory specially mo diagram of diatomic atoms,their bond orders,bond lengths and stability and experimental evidences of ionisation energy from PES.
It is about molecular orbital theory specially mo diagram of diatomic atoms,their bond orders,bond lengths and stability and experimental evidences of ionisation energy from PES.
The following questions answers are as under:-
What is the valence bond theory?
What are the shortcomings of VBT?
What are the merits of the valence bond theory?
The elements in which the valence electron enters the s orbital are called s block elements.
The elements in which the valence electron enters the p orbital are called p block elements.
A detailed presentation about what is MOT. Explaining its principles, sigma and pi bonds, bond order, and molecular stability. A good and knowledgeable presentation to understand these concepts.
A brief introduction to lanthanide elements is given.
Order .ppts like this at <https://www.fiverr.com/anikmal/teamup-with-you-to-prepare-the-best-presentation>
Along with their physical and chemical properties are also shown. Helpful for quick understanding on lanthanide series.
The following questions answers are as under:-
What is the valence bond theory?
What are the shortcomings of VBT?
What are the merits of the valence bond theory?
The elements in which the valence electron enters the s orbital are called s block elements.
The elements in which the valence electron enters the p orbital are called p block elements.
A detailed presentation about what is MOT. Explaining its principles, sigma and pi bonds, bond order, and molecular stability. A good and knowledgeable presentation to understand these concepts.
A brief introduction to lanthanide elements is given.
Order .ppts like this at <https://www.fiverr.com/anikmal/teamup-with-you-to-prepare-the-best-presentation>
Along with their physical and chemical properties are also shown. Helpful for quick understanding on lanthanide series.
The attractive force which holds various constituents (atom, ions, etc.) together and stabilizes them by the overall loss of energy is known as chemical bonding. Therefore, it can be understood that chemical compounds are reliant on the strength of the chemical bonds between its constituents; The stronger the bonding between the constituents, the more stable the resulting compound would be.
The attractive force which holds various constituents (atom, ions, etc.) together and stabilizes them by the overall loss of energy is known as chemical bonding. Therefore, it can be understood that chemical compounds are reliant on the strength of the chemical bonds between its constituents; The stronger the bonding between the constituents, the more stable the resulting compound would be.
Argus lab - a freeware PC program for modellingChris Sonntag
ArgusLab is a very powerful program that can be installed on a Windows PC. You can model even big molecules, create 3D geometry optimized models and calculate various properties like dipolmoments and HOMO/LUMO energies and shapes.
Really useful for chemical education.
Properties of coordination compounds part 1Chris Sonntag
Present a short review about Crystal field theory and how we can use the results of it to explain various physico-chemical properties of transition metal complexes.
How do we describe the bonding between transition metal (ions) and their ligands (like water, ammonia, CO etc) ?
The Crystal Field Model gives a simple theory to explain electronic spectra.
Introduction to the structure of atoms from the view of a chemist - what are neutrons protons and electrons and how are they organized ? How are electrons organized - in 3 quantum numbers. Experimental evidence from the Bohr model.
Elementary steps in catalysis using transition metal compoundsChris Sonntag
Description of the basic steps in catalysis
Discussion of oxidation addition, reductive elimination and migration reactions with examples
Catalytic cycles
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
"Protectable subject matters, Protection in biotechnology, Protection of othe...
Valence Bond Theory
1. Chemical Bonds and Properties
What we will learn:
• 4 types of bonding and their properties
• Electronegativity and polar bonds
• Valence Bond Theory
• VSEPR
• Hybridization of Orbitals
• Sigma- and pi-bonds
• Oxidation Numbers
• Formal Charge
• Resonance
4. O3
• What different kind of electrons are in this
molecule ?
• Is this molecule stable ?
• Does this molecule have a charge ?
• Is this molecule linear or bent ?
• Is the bond strength higher, the same or lower
than in O2 ?
5. H2O
• Is this molecule linear or bent ?
• How many different kinds of electrons are in
this molecule ?
• Why is this molecule a liquid at RT, but H2S is a
gas ?
• Why is this molecule more stable than
Hydrogenperoxide ?
6. CO
• Is this molecule stable ?
• Is this molecule more or less reactive than CO2 ?
7. • Is this molecule stable ?
• Is this molecule planar ?
• Why is this molecule a weak acid ?
10. After this lesson, we should understand:
• Valence electrons
• Covalent and ionic bond
• σ- and π-bonds, lone pairs
• Lewis Structure
• Electronegativity
• Dipole moment
• Oxidation number
• Formal Charge
• Octet Rule
• Hybridization
• Basic shapes of simple molecules
11. Ionic Bond
Normally between a metal and a non-metal:
They exchange electrons and become ions
(charged atoms) which attract each other by
electrostatic force.
A pair of ions does not stay alone but form crystals
12. Covalent Bond
Two non-metals share
(valence) electrons:
(Remark: Transition metals can form covalent bonds also !)
13. Polar Covalent Bond
Two non-metals share electrons unevenly because
of electronegativity difference.
Electrons are closer to one atom than the other.
This results on partially negative and positive charges on the atoms
14. Metallic Bond
Metal atoms share all
their valence electrons,
which freely move
between all atoms which
form a network.
Therefore all metals can conduct electricity and look shiny
30. (1) Formal Charge
Split all bonds in the middle
=> “real” charge on atoms
(2) Octet Rule
Count all bonding electrons for one atom
=> 8 is most stable
(3) Oxidation Number
Give all bonding electrons to the
more electronegative atom
51. Hybrid Orbitals
All orbitals in an atom involved in sigma-bonds
hybridize (mix) into orbitals of equal energy.
Pi-Bonds are still formed by p-orbitals.
Lone electron pairs count as “single bonds” and
are part of the hybridization !
58. Tasks
• Draw the Lewis Structures and the Hybrid
Orbitals for Ethane, Ethene and Ethyne
(mark the hybrid orbitals)
• Which hybridization has the central atom in:
H2O, O2, NH3, NH4+, N in pyridine, O in THF,
S in SOCl2, C in HCHO
59. Inclusion of d-orbitals
Elements in row 3 and up, hybridization can
include also d-electrons.
Typical example: SF6 with 6 sigma bonds
61. Special Case: Transition Metal compounds
Bonds in transition metal compounds are either
ionic like in FeCl3
but can be covalent as well as in Fe(CO)5
=> the VB Theory is not very suitable to explain
the bonding for transition metals !
This can be done with the “Crystal Field Theory”
(soon to come ….. )