Lewis Structures or Electron Dot Structures

Lewis Structures or Electron Dot Structures Lewis structures, also known as electron dot structures, are named after Gilbert N. Lewis, who described them in his 1916 article titled The Atom and the Molecule. Lewis structures depict the bonds between atoms of a molecule as well as any unbonded electron pairs. You can draw a Lewis dot structure for any covalent molecule or coordination compound. Lewis Structure Basics A Lewis structure is a type of shorthand notation. Atoms are written using their element symbols. Lines are drawn between atoms to indicate chemical bonds. Single lines are single bonds, double lines are double bonds, and triple lines are triple bonds. (Sometimes pairs of dots are used instead of lines, but this is uncommon.) Dots are drawn next to atoms to show unbonded electrons. A pair of dots is a pair of excess electrons. Steps to Drawing a Lewis Structure Pick a central atom. Start your structure by picking a central atom and writing its element symbol. This will be the atom with the lowest electronegativity. Sometimes its difficult to know which atom is the least electronegative, but you can use the periodic table trends to help you out. Electronegativity typically increases as you move from left to right across the periodic table and decreases as you move down the table, from top to bottom. You can consult a table of electronegativities, but be aware different tables may give you slightly different values, since electronegativity is calculated. Once you have selected the central atom, write it down and connect the other atoms to it with a single bond. You may change these bonds to double or triple bonds as you progress.Count electrons. Lewis electron dot structures show the valence electrons for each atom. You dont need to worry about the total number of electrons, only those in the outer shells. The octet rule states that atoms wit h eight electrons in their outer shell are stable. This rule applies well up to period 4, when it takes 18 electrons to fill the outer orbitals. Filling the outer orbitals of electrons from period 6 requires 32 electrons. However, most of the time you are asked to draw a Lewis structure, you can stick with the octet rule. Place electrons around atoms. Once you have determined how many electrons to draw around each atom, start placing them on the structure. Start by placing one pair of dots for each pair of valence electrons. Once the lone pairs are placed, you may find that some atoms, particularly the central atom, dont have a complete octet of electrons. This indicates there are double or possibly triple bonds. Remember, it takes a pair of electrons to form a bond. Once the electrons have been placed, put brackets around the entire structure. If there is a charge on the molecule, write it as a superscript on the upper right, outside of the bracket. More About Lewis Structures Here is more information about Lewis structures: Step: Exceptions to the Octet RuleLewis Structure Example Problem: Formaldehyde

The Atrocities of the Congo Free State Rubber Regime

The Atrocities of the Congo Free State Rubber Regime When the Belgian King Leopold II acquired the Congo Free State during the Scramble for Africa in 1885, he claimed he was establishing the colony for humanitarian and scientific purposes, but in reality, its sole aim was profit, as much as possible, as fast as possible. The results of this rule were very uneven. Regions that were hard to access or lacked profitable resources escaped much of the violence that was to follow, but for those areas directly under the rule of the Free State or the companies it leased land to, the results were devastating. The Rubber Regime   Initially, government and commercial agents focused on acquiring ivory, but inventions, like the car, dramatically increased the demand for rubber.  Unfortunately, for the Congo, it was one of the only places in the world to have a large supply of wild rubber, and the government and its affiliated trading companies quickly shifted their focus to extracting the suddenly lucrative commodity. Company agents were paid large concessions on top of their salaries for the profits they generated, creating personal incentives to force people to work more and harder for little to no pay.  The only way to do that was through the use of terror. Atrocities In order to enforce the near impossible rubber quotas imposed on villages, agents and officials called on the Free State’s army, the Force Publique. This army was composed of white officers and African soldiers. Some of these soldiers were recruits, while others were slaves or orphans brought up to serve the colonial army. The army become known for its brutality, with the officers and soldiers being accused of  destroying villages, taking hostages, raping, torturing, and extorting the people. Men who did not fulfill their quota were killed or mutilated. They also sometimes eradicated  whole villages that failed to meet the quotas as a warning to others. Women and children were often taken hostage until men fulfilled a quota; during which time the women were raped repeatedly. The iconic images to emerge from this terror, though, were the baskets full of smoked hands and the Congolese children who survived ​having a hand cut off. A Hand for Every Bullet Belgian officers were afraid that the rank and file of the Force Publique would waste bullets, so they demanded a human hand for each bullet their soldiers used as proof that the killings had been done.  Soldiers were also reportedly promised their freedom or given other incentives for killing the most people as proven by supplying the most hands. Many people wonder why these soldiers were willing to do this to their ‘own’ people, but there was no sense of being ‘Congolese’. These men were generally from other parts of the Congo or other colonies entirely, and the orphans and slaves had often been brutalized themselves.  The Force Publique, no doubt, also attracted men who, for whatever reason, felt little compunction about wielding such violence, but this was true of the white officers as well. The vicious fighting and terror of the Congo Free State is better understood as another example of the incredible capacity of people for incomprehensible cruelty. Humanity and Reform The horrors, though, are only one part of the story. Amidst all of this, some of the best of people was also seen, in the bravery and resilience of ordinary Congolese men and women who resisted in small and large ways, and the passionate efforts of several American and European missionaries and activists to bring about reform.

Paper Number 3 - Human Resource Management Essay

Paper Number 3 - Human Resource Management - Essay Example Through training, any company can raise the ability to adopt and use advance technology. It makes employees more efficient and also motivates them. It increases the knowledge of the employee which in turn enhances the company’s competitive position. Proper training increases productivity and efficiency of organization, decreases employee turnover and need of supervision. Through training, an employee develops a sense of confidence and self-worth and becomes valuable to the organization and to society. The knowledge received through training helps to increase productivity and sense of fulfillment through achievement of any task. Three areas must be considered to identify the reason for training: the organizational goal, the job characteristics and needs of the employees. The resources required for training also needs to be considered otherwise the training program will fail. There are two types of training methods on the job training and off the job training. Cognitive Methods: Cognitive methods provide the rules regarding how to do a specific task through written or verbal information and express the relationship among various concepts. Various methods that come under cognitive approach are lecture, demonstration, discussion and CBT (Computer Based Training). Behavioral Method: In this method, the employees are provided practical training. This method teaches the trainee how to behave in real work life. The various methods of behavioral approaches are business games, behavior modeling, equipment simulator, and in-basket method. Management Development: This method focuses on education of employees. This method is divided into on the job training and off the job training. On the Job Training: This type of training is conducted to employees while they are performing their regular job. In this training method a plan is developed about the subject to be taught. The employees are informed about the details of training. A timetable is developed for monitoring t he performance and progress of employees. This training method has positive effect on employee morale because it not only teaches the skills for doing any specific task but also makes them think critically to solve any problem that might occur while doing any job. Examples of on the job training are orientation, job instruction training, apprenticeship, internship, assistantship, coaching, and job rotation. Off the Job Training: This training method takes place outside the real work place. Specific trainer is used for training the employees. In this method employees put all focus on the training and their job cannot distract the training process. Examples of off the job training methods are lectures, case studies, role playing, simulation, and laboratory training (Bizmove, â€Å"Small Business Management†). Summary of the Article Dubai Metro is an automated metro network of Dubai city. The center of Dubai Metro has almost 150 employees. The employees control the operation of technological system. The RTA (Road and Transport Agency) is providing training to the staff of Dubai Metro. Training will be provided on various aspects such as different facets of operations, maintenance, security related issues, health and safety of staff. Besides these the employees will be trained about other supporting services such as management, human resource, contracts, finance,

Gender Roles in Society Essay Example | Topics and Well Written Essays - 1000 words

Gender Roles in Society - Essay Example Girls are encouraged to play with dolls and boys on the contrary engage in activities which suit their gender. â€Å"While both mothers and fathers contribute to the gender stereotyping of their children, fathers have been found to reinforce gender stereotypes more often than mothers.† (Ruble, 1988) These were some of the socio-cultural and biological factors which affect gender role development. Sexuality and Sexual Orientation â€Å"Sexuality  has three stages: Desire is an interest in being sexual. Excitement is the state of arousal that sexual stimulation causes. And orgasm is sexual pleasure's peaking. A sexual disorder occurs when there's a problem in at least one of these stages.† (Sexuality) Sexual orientation refers to the disposition of men towards women and vice-versa. This attraction gets redefined at times when men get attracted towards other men and women get attracted towards other women. Sexual orientation is very closely connected with personal identi ty; one chooses an ideal partner depending on their compatibility and gets romantically involved with that person. There are many factors that can easily influence sexual orientation. Loneliness and sadness is the most common cause of homosexuality, child abuse can also significantly alter the sexual orientation of a person. When peers reject a person during his adolescence, the person becomes lonely and starts seeking the company of someone who can help. Weak masculine identity is another cause of homosexual temptation, fear and mistrust is another common cause which can determine one’s sexual orientation. Some people become sexually compulsive and that is how their sexual orientation changes. Trauma during childhood is another common cause of homosexuality; other important causes... The book Two Ways A Woman Can Get Hurt sheds light upon how media presents women in advertisements and in other forms. The researcher states that the author of the book is aghast, that today women are presented as sex objects in advertisements and she also points out that this has a devastating effect on young children watching these advertisements, the same children grow up thinking women to be nothing more than sex objects and they start exploiting women and the same also becomes a vicious cycle. The author also points to the fact that women are shown to have an orgasm when doing their hair and this is extremely serious according to the author but the advertisements take this least seriously and the same has serious ramifications on the mindsets of the people watching these adverts. Men and women are treated very differently in our society and this is a very serious issue, women often treated as nothing more than sex objects, on the other hand men dominate in almost every area, the se differences still prevail in our society but we often turn a blind eye towards them and move on. The researcher also focuses on the sexuality, that has three stages, that were analyzed in the study. It is then concluded that it is time to bring about a drastic change and to restore parity in the society, because women have suffered a lot in the past and we must ensure now that they do not suffer anymore in the future, but bringing these changes still remains a big challenge not only in the United States, but around the world.

Understanding of the Old Testament Essay Example for Free

Understanding of the Old Testament Essay To what extent does archaeology inform us about our understanding of the Old Testament? The Jewish scriptures that made up the Old Testament were written over a period of a hundred years during a time when the Israelites were established and prosperous, but also during the times when the whole religion and lifestyle were under threat throughout exiles and national crises. Biblical scholars study the evidence within the scriptures themselves and also use other resources such as prehistoric documents and archaeological findings in order to inform us more thoroughly about the Old Testament. Archaeology is a modern science calling for much patience and skill. Generally speaking there are three kinds of archaeology. The first is ruins of buildings, homes, temples and fortifications. These reveal culture, worship, social structure and manner of life. The second is artefacts, pots, lamps, weapons and ornaments. These reveal something about wealth and culture. The third is inscriptions, also known as epigraphic material. This reveals what people wrote about. We have to be cautious about what archaeology can prove. From reading ancient texts, scholars can not always tell whether it is true or not. We can simply tell what the writer of the text wanted the world to believe. Archaeology can help to provide evidence that an event happened, but it cannot always show why it happened nor who was involved. Therefore it is most useful for corroboration. Through archaeology scholars can discover more about the times in which people in the Bible lived. What importance did they have as a nation among other nations? What were their everyday lives like? What animals did they keep? What did they eat? How did they trade? What were their social habits and family interactions? What was the nature of the other religions by which they were surrounded when Judaism was first beginning and much more? One of the main reasons scholars look for archaeological evidence is due to an issue that causes the most controversy- whether the events described really happened. For many people who are strong believers this is not an issue for them as the Bible, which is the Word of God is thought to them to be more true than any other foundation of information, so therefore the events portrayed in the Bible are true to them. If there is no outside evidence to support this, or discoveries of scholars contradict what the Bible says, then the Bible remains true to the believers as the people investigating the evidence are thought to be able to be fallible whereas for the believers, the Bible is not. Many people are also willing to accept that some of the Bibles accounts are true in a theological rather than a historical sense. However, it is argued that the accuracy of the historical accounts might have been sacrificed in order to put emphasis on the theological point. It is very difficult for events in the Old Testament to be accurately dated for many reasons. The main reason is that many of the written records have not survived. This is because many of the texts were written on insubstantial materials and the climate was not particularly dry and therefore could not preserve the texts. Another reason is that much of the Old Testament originated as oral traditions rather than written, which means whilst being passed on from one person to another, the real translation could have sometimes been changed through misunderstanding or false impression. This makes it extremely difficult for scholars to work out which parts are historically correct and which are not as elements may have been removed or added. Texts occasionally referred to features which were thought to be of a later date than the story itself and therefore scholars have to decide if the older parts of a narrative were correct or had been altered. Biblical writers also often exaggerated wha t was written in order to express that someone was particularly blessed by God. This means scholars have to make informed guesses where they do not know facts, which means they can easily make mistakes in accuracy as well as writing according to their own biases. A final reason why the Bible cannot be accurately dated is because Biblical writers primary purpose was not to write an accurate historical record. Their main interest was to illustrate the relationship between God and humanity, particularly the relationship between God and his chosen people, Israel. This meant important rulers and political events of global importance, which could give the Bible definite dates if they were mentioned in the texts, were ignored because they did not show any relevance for religious faith. Some people dispute that a date from the Bible can be found using the text itself as many do believe the Bible is historically accurate and reliable as the Bible is inspired by God. However, for many scholars this is thought to be very unreliable. As well as using documents to attempt to place the Bible in historical context, archaeologists have searched for evidence of the existence of cities and buildings mentioned in Biblical stories. Since the First World War, scholars have used archaeology to discover more reliable sources about events that were said to have happened in the Old Testament. For example, excavations on the southern bank of the river Euphrates in Syria revealed the existence of a city called Mari. From this city, archaeologists found cuneiform (wedge-shaped writing of ancient civilisations) tablets dating from the nineteenth and eighteenth centuries BC. They provided a wealth of information containing economic factors which helped scholars to understand the ways in which people lived in the Middle Bronze Age. In the past, thousands of tablets covered with cuneiform have been discovered. They provide information about the Biblical world before 100 BC. After that time alphabets with letters not made up of combinations of triangles begin to emerge and we are on our way to the Hebrew script known to Biblical scholars. Names found through archaeology can provide more clues to the dating or geographical setting of particular events in the Old Testament because when scholars find evidence of other people with comparable names to those of characters in the Bible, it can suggest a background for the Biblical writings. To conclude, archaeology can help to inform us more about events that happened in the Old Testament and help us understand what happened and who was involved more than we already do. However, we cannot always rely on archaeology to inform our understanding of the Old Testament as archaeologists and scholars do not always know the truth behind evidence found, they are only able to use what they see with their own eyes and make educated guesses with what they already know.

Analysis of Internet Protocols and Infrastructure Essay -- Internet Te

Analysis of Internet Protocols and Infrastructure Introduction: Network: Anything reticulated or decussated at equal distances, with interstices between the intersections. - A Dictionary of the English Language SECTION : 1 1.1 WHAT IS A NETWORK? A) What is a network? A network is simply a collection of machines connected in some way that allows them to communicate with each other and share information. To do this the machines have to be connected in some way that allows communication, and have an agreed upon a language to talk when they do communicate. Components of a network might include individual hosts, some form of communications hardware, a network protocol and a collection of network services. B) Individual hosts A network is a collection of individual machines sometimes referred to as hosts. Each host (computer) must have some unique identifier that allows other hosts to talk to it. 1.2 COMPONENTS OF A NETWORK A) Network Protocol In order to communicate the parties must speak the same language. Languages on computer networks are referred to as network protocols. A network protocol is simply a set of rules and formats that govern how information is sent and in what format it is sent. Some of the different network protocols used today include TCP/IP (Internet and UNIX favourite), IPX (Novell), Appletalk (MAC), DECnet and various others. TCP/IP is quickly becoming the networking protocol and is the one I concentrate on in this subject. B) Network services To be of use to users the network will provide various services including file, print and device sharing, electronic mail etc. 1.3 TYPES OF NETWORKS A) Network categories  · LAN (local ... ...UNIX the routing table can be viewed using the netstat command. The route a packet follows can be viewed using the traceroute command. Routing tables are either created statically, or by the systems administrator configuring the system, using the startup or configuration fiels, to used a pre-defined, unchanging route.dynamically.  · There are protocols, part of TCP/IP, that will dynamically modify the routing table in response to events.  · Adding a host to the network requires obtaining, installing and configuring the necessary network hardware, gather the required information including IP address and hostname of the new host, the gateway and the name server, the network address and the subnet mask, modify the appropriate configuration and startup files with that information, make sure the new host has an entry in the domain name service, test the connection.

Establishign a Company Pmo, Ppm & Governance Structure

A project management culture is important in today’s competitive environment. If the company is to thrive and meet future financial targets, project management principles and practices must be a part of our business management model. Every employee must understand how critical this undertaking is. Below are examples (Gary, Larson, 2008) of business environment drivers that are moving the company to create this extremely important initiative. oIn high-tech industries, the product life-cycle is averaging 1 to 3 years.Approximately 30 years ago, life cycles of 10 – 15 years were not uncommon. Time to market for new products with short life cycles has become increasingly important. oThe open global markets of today demand cheaper products and services but also better products and services. This coincides with the quality movement and the practice of building quality into the project plan. oThe growth in new knowledge and understanding has increased the complexity of project s because projects encompass the latest advances from the materials used to the specifications, codes, equipment and specialists required to complete the project objectives.Increased competition has placed much emphasis on customer satisfaction. No one settles for generic products and services. The demand is around customized products and services that cater to specific needs. Years ago there was more of a â€Å"one-size fits all† approach. Now there is a great deal of selection. In summary, there are a substantial number of environmental forces requiring the company to take project management to the next step. The company project management initiative will position us for the future business environment which will require increased accountability, flexibility, innovation, speed and continuous improvement.This briefing will describe this company initiative and plans to create a Project Management Office (PMO), initiate Project Portfolio Management, an improved governance stru cture and addresses a change in culture to assure project management and proper governance are part of our daily activities. Establish Project Management Office Project Management Offices often have different styles (Morris, 2008). The company PMO will have a style of â€Å"Operational Partner. † The PMO is not only to create the project management methodology and governance, it will also help organizations grow and meet their strategic targets.The PMO will also be a major factor in project selection through Project Portfolio Management (PPM). This will assure projects are being selected for their overall contribution and alignment to the company strategies. The responsibilities of the PMO are: oMethodology Creation – Creates successful and repeatable processes in support of the company project management methodologies. oProvide Project Management – Supply the project management function to the company business units. Centralized Reporting – Organizationa l level reporting providing complete views of all project activity and summarizing cost and progress reporting for the entire company. oKnowledge Center – Act as an advisor and will maintain a knowledge center for project documentation. oProject Selection – Creating criteria and methods for project selection via a Project Portfolio Management process. The plan (see accompanying MS Project File) to establish the Project Management Office starts with a Brainstorming session with the CIO.This session leverages participant innovation and â€Å"out of the box† thinking to establish the PMO strategy management elements (Vision, Mission, Goals). Once the strategy management elements are defined, the PMO design and architecture phase will start. During this phase, the PMO Responsibilities, Authority and Accountabilities (RA&A) are documented, the team architecture is defined and the facilities requirements are documented. Choosing the PMO team could be the single most i mportant decision in establishing the PMO (Campbell, Baker, 2007).During the development phase, the PMO staff, team operating rhythm, PMO processes will be created and the facilities build up occurs. Establish Project Portfolio Management A Project Portfolio Management (PPM) methodology will be established. The purpose of the PPM is to assure approved projects are aligned with the company strategic goals and priorities. This methodology will provide information that enables better business decisions. Figure 1 shows a conceptual project scoring matrix that may be used to measure projects against specific criteria.Projects that are approved will be tracked to assure the business case comes home and the forecasted return on investment is realized. The plan (see accompanying MS Project File) to establish PPM, like the PMO, starts with a brainstorming session and again will include the CIO and leverage participant innovation and â€Å"out of the box† thinking. The key outcome of t he session is to define and document the objectives of the PPM and each step of a PPM gated process. The PPM gates to be defined are: oGate 1 – Define and Prioritize Business Strategy Gate 2 – Capture and Publish Idea oGate 3 – Publish Business case for Idea Review and Rating oGate 4 – Idea Analysis and Approval oGate 5 – Finalize Design Document oGate 6 – Approval Each gate will go through a design phase prior to entering the development phase. A formal tracking method and visual controls will be created to include â€Å"return on investment† verification. The net present value (NPV) model will be used to access the project against management’s minimum desired rate-of-return to compute the present value of all cash inflows.If the result is positive, it will be eligible for further consideration. Other project considerations are shown below. oIncreasing market share oIncreases difficulty for competitors to enter market oCreatio n of an adjacent product or service oIncreases independence from unreliable suppliers oCreation of new technology that enables new products or product derivatives oCreation of a product that will increase sales of more profitable products oReduced production defectsFigure 1 – Conceptual Project Scoring Matrix (Gary, Larson, 2008) Each project will be scored against the selection criteria. Based on the scoring for the project a total scoring based on the weighting will reflect the final score. Establish Governance Structure In order for the PPM to function properly, an Investment Review Board (IRB) must be put in place to assure proposed projects are brought through the approved process, voted on based on the selection criteria established and formally tracked to the success criteria stated in the business case.Each functional area will have representation on the IRB. This assures that impacts to the overall company priorities can be assessed and result in the best possible go vernance of the projects and priorities in alignment with the company strategies. Like the other major planning components of this company initiative, the plan to build the new Governance Structure will start with a brainstorming session. The session will include the CIO and a representative from each of the functional areas.This provides an opportunity for a manager from each area to help shape this important board and voice any risks or issues to assure these are addressed in the design and architecture phase in creating the governance structure. The session will focus on foundational elements in creating the new structure such as board chartering, RA&A (Responsibility, Authority & Accountability), team structure and operating rhythm. A draft of a governance board structure is shown in figure 2 to facilitate initial discussions. Figure 2 – Governance Board Structure Establish Culture Change/Communication PlanThe success of this company initiative is in the hands of every te am member in the company. If we are going to remain competitive and thrive in a global market, we must take our business disciplines in project management and governance to the next level. A communication plan is part of the overall plan to assure the flow of information horizontally and vertically. Culture change requires a high degree of multi-faceted communications (hybrid of high touch and no-touch). This plan supports a corporate communications expert to help assure â€Å"the right information† is getting to â€Å"the right individuals† as â€Å"the right time. This includes branding the activities for promotional purposes and creation of escalation paths for any employee (non-management and management alike) with questions, concerns and issues surrounding the initiative. This effort will mitigate previous issues where a top down deployment of a company initiative did not enable the escalation of issues and concerns related to the implementation challenges experi enced by the employees. Summary This plan requires a commitment from all employees. We can not afford to fail in our efforts.Securing our future growth and prosperity are paramount in the challenging business climate of today. To help the company make this successful journey, extensive use of the Independent Review process (to be created by the PMO) will assure full implementation of the initiative and achievement to the expected level of performance. The benefits of this initiative will be seen and felt by every employee in the way of focused efforts that are sized and prioritized for the approved resources and aligned to the company strategies resulting in greater levels of shareholder value.Thank you in advance for your support of this plan. NOTE: A non-recurring budget snapshot for the development and implementation of this initiative is shown in figure 3. Figure 3: Non-recurring Budget SnapshotReferences Morris, Rick A. (2008) The Everything Project Management Book 2nd Edition Avon, MA: Adams Media Gary, C. F. , Larson, E. W. (2008) Project Management – The Managerial Process New York, NY: McGraw-Hill Irwin Campbell, G. M. , Baker, S. B. (2007) Project Management Fourth Edition New York, NY: Penguin Group