Steric Number Definition in Chemistry

Steric Number Definition in Chemistry Steric number is the number of atoms bonded to a central atom of a molecule plus the number of lone pairs attached to the central atom. The steric number of a molecule is used in VSEPRÂ  (valence shell electron pair repulsion) theory to determine the molecular geometry of a molecule. How to Find the Steric Number Use the Lewis structure to determine the steric number. The steric number gives the electron-pair arrangement for the geometry that maximizes distance between valence electron pairs. When the distance between valence electrons is maximized, the energy of the molecule is at its lowest state and the molecule is in its most stable configuration. The steric number is calculated using the following formula: Steric Number (number of lone electron pairs on the central atom) (number of atoms bonded to the central atom) Heres a handy table that gives the bond angle that maximizes separation between electrons and gives the associated hybrid orbital. Its a good idea to learn the bond angle and orbitals, since these appear on many standardized exams. S# bond angle hybrid orbital 4 109.5 sp3 hybrid orbital (4 total orbitals) 3 120 sp2 hybrid orbitals (3 total orbitals) 2 180 sp hybrid orbitals (2 total orbitals) 1 no angle s orbital (hydrogen has an S# of 1) Steric Number and Hybrid Orbital Steric Number Calculation Examples Methane (CH4) - Methane consists of carbon bonded to 4 hydrogen atoms and 0 lone pairs. Steric numer is 4.Water (H2O) - Water has two hydrogen atoms bonded to oxygen and also 2 lone pairs, so its steric number is 4.Ammonia (NH3) - Ammonia also has a steric number of 4 because it has 3 hydrogen atoms bonded to nitrogen and 1 lone electron pair.Ethylene (C2H4) - Ethylene has 3 bonded atoms and no lone pairs. Note the carbon double bond. Steric number 3.Acetylene (C2H2) - The carbons are bonded by a triple bond. There are 2 bonded atoms and no lone pairs. Steric number 2.Carbon Dioxide (CO2) - Carbon dioxide is an example of a compound that contains 2 sets of double bonds. There are 2 oxygen atoms bonded to carbon, with no lone pairs, so the steric number is 2. Shape Versus Steric Number Another way to look at molecular geometry is to assign the shape of the molecule according to steric number: SN 2 is linear SN 3 is trigonal planar SN 4 is tetrahedral SN 5 is trigonal bipyramidal SN 6 is octahedral Steric Number Key Takeaways In chemistry, a molecules steric number is the number of atoms bonded to the central atom plus the number of lone electron pairs surrounding the central atom.The steric number is used in VSEPR theory to predict molecular geometry.

A Study On The Blooming Of Convenience Store

A Study On The Blooming Of Convenience Store This research proposal studies on the factors which affect the blooming of convenience store in petrol kiosk. The components of blooming of convenience store are based on the economy of the country, the sales of petrol kiosk, and the spending potential of the customer. Objectives: To investigate how the economy of the country can affect the blooming of convenience store in petrol kiosk To investigate how the sales of petrol kiosk affects the blooming of convenience store in petrol kiosk To find out if the spending potential of the customer affects the blooming of convenience in petrol kiosk Research Question: How the economy of the country can affect the blooming of convenience store in petrol kiosk? How the sales of petrol kiosk affect the blooming of convenience store in petrol kiosk? How the spending potential of customer affect the blooming of convenience store in petrol kiosk? Introduction: A convenience store is a small store that sells items such as bakeries, beverage, biscui t, car care, confectionary, groceries or some selective processed food, lubricants, personal care and household, salty snacks or local tidbits, tobacco, newspaper and magazine. Some part of petrol kiosk may also sell windshield washer fluid, radiator fluid and maps. A convenience store can be a reasonably profitable  business  because many people will pay extra to buy an item quickly and conveniently or sometimes to make up for the convenience they offer. The price in convenience store are often higher the supermarkets or hypermarkets. The key for a successful convenience store is the location. That’s why stores are normally located along busy roads, high population neighbourhoods and petrol kiosk. Travellers normally stopping by for petrol or toilet facilities are often appreciate the convenience of having foods, drinks, reading materials and maps available without having to go to a supermarket. Convenience stores are usually open even when supermarkets are closed and us ually allow for quick shopping and service. For locals, they likely to go to convenience store when their regular supermarket is closed and they need the items such as milk, toilet paper or bread that they already running out at home. However, many locals go to convenience stores regularly to buy magazine and candy. Students often buy cold drinks and snack foods from convenience store. Many convenience stores have microwaves for heating up the prepared sandwiches, soups and hot dogs they sell. Some stores also have coffee and breakfast sandwich special for those people who travel for work in the morning. Drinks and coffee machines and prepared foods are often together in another area and there may be a deli. Newspaper sometimes included in these offers and it may be available at the front counter and or at the magazine rack in the store. Convenience stores often carry at least some ready-to-go items such as muffins and doughnuts. Significant of Study: This study aims at finding out the relationships between the large potential of customer, the economy, and sales of the petrol kiosk, spending potential of the customer and strategic location with the blooming of convenience stores in petrol kiosk.

The role of salt marshes in the coastal system Essay

The role of salt marshes in the coastal system - Essay Example Since salt marshes are shallow areas, the plants that exist in salt marshes are those that can adapt to the tidal changes in the volume of water. The water waves that make it to the salt marshes carry with them tons of organic material which accumulate overtime to form peat. There are many varieties of salt marshes namely: low marsh, high marsh, panes and pools and upland border. Apart from providing thick vegetation, salt marshes are also amongst the most productive ecosystems in the world (New Hampshire Department of Environmental Services, 2004). Role of Salt Marshes in the Coastal System: Salt marshes are sometimes referred to as tidal marshes, the reason being that salt marshes are found in zones between high and low tide. Salt marshes thrive well along the coastal areas because the vegetation is not sturdy enough to withstand strong waves, therefore towards the coastal areas, where the intensity of the waves is reduced to quite an extent, salt marshes thrive (Casagrande, 1997). Salt marshes serve many purposes, namely; they cleanse pollutants from marine water, provide a habitat to many marine species, provide a barrier against soil erosion, provide a source of refuge for the vulnerable marine species, salt marshes are rich in organic matter therefore they form a food chain for the marine life and also provide good nutrient value for the vegetation in the salt marshes (Department of Environmental Protection: Florida Marine Reseach Institute, 2010). Let us throw some light on the varied roles of salt marshes: Remove Pollutants from the Water Since the speed of the waves reduces considerably by the time they reach salt marshes, many suspended particles that are otherwise carried away by the waves throughout the sea, tend to settle. These suspended particles sometimes comprise of toxic nutrients from human activities, thus by allowing them to settle the salt marshes play a key role in cleansing the water of toxic sediments. The thick vegetation helps in slow ing down the waves which in turn causes the particles to settle. Furthermore, during the months of summer and spring the salt marshes’ plants take up the nutrients which if left in the water, would turn into algae, further polluting the water by causing â€Å"Eutrophication† and thus depleting the oxygen supply of the water (Cloern, 2007). The toxic contaminants which are settled by the salt marshes form peat which results in the removal of these toxic substances from the marine food web. Moreover, the microbes present in the salt marshes tend to remove nitrogen from the ecosystem (Edwards, 2010). This is beneficial even to the surrounding eelgrass. The reason behind this is that the existence of high levels of nitrogen encourages the growth of phytoplankton. Phytoplankton refers to microscopic organisms that live in water (Lindsey, 2010). This phytoplankton, when in excess blocks the sunlight which is needed for eelgrass to thrive. Therefore, the presence of salt mars hes also benefits eelgrass. Harbour Marine Food Chains The excessive nutrients found in the salt marshes form food chains for marine species. Primarily, the plant matter that partially decays in the salt marshes forms a good source of food for marine species in the deeper waters. This decayed vegetation is taken away by the tidal waves into the ocean where it becomes the food of many marine animals. A two way process runs between aquatic

Capitalism Essay Example | Topics and Well Written Essays - 250 words - 2

Capitalism - Essay Example The fourteen century crisis leads to emergence of modern capitalism. Land ownership and agricultural production gave rise to conflicts. The arrangements of manorial hinder the development of capitalism. This was when lords force serfs to produce which hinder them from getting interests through technological innovations. The serfs could only produce what was enough for their families. Expansion of power and wealth by lords led to conspicuous consumption. The crisis in the century was through bad weather, productivity in agriculture and limitations on technology. There was division of classes due to rise of relationships which were contractual between serfs and lords. Feudalism laid foundations necessary for mechanistic development. Exploration also facilitates the development of capitalism. The rise of competition led to creation of the new model. It led to winning and losing. Feudalism which led to mechanistic led to ownership of corporation and private sectors. Decisions of private sectors, prices of different commodities, goods production and distribution characterize investments, which led to free markets (Heilbroner et al, 2011). Roman Empire introduces merchant capitalisms which were advanced. This proceeds to development of Islamic capitalism. Industrial capitalism, revolutions and division of labor are some of the factors that led to creation of new model. There are many similarities between Newton and Adam Smith. For example, Adam Smith identified didactical mode which he termed as Newtonian method. Smith helped in discovering general laws of economics while Newton discovered natural laws of motion. John Millar declared Smith as Newton’s political economy. Both contributed to the project of social cohesion and balance. According to Newton, simplicity pleases nature but focuses on economy which was embarrass by Smith. Ricardo and Malthus are pessimistic about the future of capitalism. Malthus from his theory fail to anticipate production

Discrimination in America Essay -- Race Racism Prejudice

Our world has always been faced with the problem of discrimination. It is one of the most discussed topics nowadays and throughout history. In all countries there is most likely at least one type of discrimination that affects different groups of people. The definition of discrimination is the denial of opportunity or equal rights for a specific group of people that may be differentiated by things such as their religion, color of skin, or gender. The world we live in has been struggling with this sensitive subject for as long as we the have record. Many people believe discrimination has made big steps forward, but has it really? If it has, why do people still get turned down, receive hate mail, or get ridiculed simply because they differ from each other. I guess these are questions we must ask ourselves. I guess you could also ask yourself if you have ever called anybody a name, looked at them different or judged them when you did not even know them or understand them. You m ay be thinking "That is not discrimination," but, in fact, it is. Personally, I never felt that I was discriminated against by anyone or discriminated against others until I came to the USA. Even though this country welcomes all immigrants, people still get treated as â€Å"others.† I remember the night when I arrived in the United States and saw so many black people in the airport. My friends and I were pointing at them and saying â€Å"Look, they are black and they are not like us, they are others.† While we were not trying to be rude, it is clear to me now that we were actually being discriminatory. However, I didn’t realize at the time that sooner or later I would be considered as an â€Å"other† also. Even as a good-looking, smart, intelligent European w... ...ome from), the issue of racial discrimination is not as strong but there are some others, such as gender, class and religion discrimination. This is truly a global issue affecting all nations. I closing, I have realized from my arrival in America that diverse people will often judge each other by appearance and language rather than on substance. We must accept the fact that while people may get more tolerant, there will always be some sort of discrimination. Instead of giving up, it has just made me stronger as I have learned to adapt and not have a complex about my differences. I am sure there are many stories similar to mine that can be used as examples of discrimination. The United States has not solved this problem, but there are a lot of things that have been done in this country in order to have equal rights so that fewer people are treated like â€Å"others.†

Euthanasia Case Essay

Let’s start off by defining the word euthanasia so that this paper is clear and then we can get in to why it can be passive or active. Euthanasia is the painless killing of a patient suffering from an incurable and painful disease or in an irreversible coma (dictionary.com). Euthanasia, also known as assisted suicide and more loosely termed being mercy killing, basically means to take a deliberate action with the express intention of ending a life to relieve intractable suffering. Some interpret euthanasia as the practice of ending life in a painless manner. Many disagree with this interpretation, because it needs to include a reference to intractable suffering. Euthanasia is illegal. Now that we know what euthanasia is we can breakdown the two procedural classification of euthanasia (medicalnewstoday.com).†Passive euthanasia† is usually defined as withdrawing medical treatment with the deliberate intention of causing the patient’s death. For example, if a patient requires kidney dialysis to survive, and the doctors disconnect the dialysis machine, the patient will presumably die fairly soon. Perhaps the classic example of passive euthanasia is a â€Å"do not resuscitate order†. Normally if a patient has a heart attack or similar sudden interruption in life functions, medical staff will attempt to revive them. If they make no such effort but simply stand and watch as the patient dies, this is passive euthanasia. â€Å"Active euthanasia† is taking specific steps to cause the patient’s death, such as injecting the patient with poison. In practice, this is usually an overdose of pain-killers or sleeping pills. In other words, the difference between â€Å"active† and â€Å"passive† is that in active euthanasia, something is done to end the patient’s life; in passive euthanasia, something is not done that would have preserved the patient’s life. An important idea behind this distinction is that in â€Å"passive euthanasia† the doctors are not actively killing anyone; they are simply not saving him. You would surely not be prosecuted for homicide. Thus, proponents of euthanasia say that while we can debate whether active euthanasia should be legal, there can be no debate about passive euthanasia: You cannot prosecute someone for failing to save a life (pregnantpause.org). Euthanasia has been a very controversial and emotive topic for a long time (medicalnewstoday.com). The beliefs that I have on euthanasia is that is right and it is wrong at the same time. I feel that asking someone to play God is not the way to go. Active euthanasia is just a way for someone to take the easy way out. I understand that they are hurting and are in pain but that’s why the medical field has many different types of pain medicines to keep the patient comfortable enough to deal with everyday life. I think that if a doctor agrees with giving his patient a lethal dose of medicines to end their life is wrong and that then becomes assisted suicide and that they should not have been a doctor because they have violated their oath to protect and heal patients and keep them alive. Whose place is it to decide if one lives or one dies? No one here on earth, I feel like the person that is requesting this type of method to end their life is committing suicide and you are not supposed to take your own life those are my religious beliefs. Another religious belief is that God will not put more on you than you can bear, which means this is all about the endurance you have to preserve life until it is time for you to die a natural life. The other reason why I feel that it is kind of wrong to have a passive euthanasia is because you should not give up on life, you should try all the ways to survive that you can except in the situation of being brain dead or being a vegetable. But then I feel that it is that person right to decide do not resuscitate because that is there right they have that medical right to decide if they do not want to be helped and hooked up on machines just to live. If I ever get to that point I want my family and the doctors to do all that they can do to keep me alive unless in the event like I stated earlier which is brain dead or in a vegetable state. But those are just my beliefs and I cannot change the way others think or how they dictate their lives, everyone has their free will to decide about their life when it comes to passive euthanasia. Assisted dying violates the sanctity of human life speaking from a Baptist person. I agree with that because I am a Baptist and I am a Christian and that is how we were taught was not to kill yourself because you are supposed to die a natural death no matter what the situation is. That means you are allowing God to do His job and that is to letting Him decide when it is time for your life to end, no one can do that for you. Even if you allow yourself not to want to be attached to machines or get resituated you are still dying a natural life. Right to die is just that the right to die but when I say it I mean a right to die of natural causes, not by the hand of another person or by a high dosage of pills to end your life. I understand that if you have a do not resuscitate then that is your choice and I support that choice because you either or going to die or you will pull through which gives that a 50/50 chance. But you are still having your request met by not being resuscitated. so I think that it okay to die a natural life like I have stated before but to have a euthanasia I do not agree with because it is not your time to go, it is the time that you would prefer to leave the earth not when you are meant to leave. Patient suffering at end of life, I hate that people has to suffer but it is a part of life everyone will have their ups and downs in life and unfortunately pain and suffering is life. But the medical field has expanded so far that they are easy to solve the pain or I should say make it easier for patient to be much more comfortable in their time of need where they will not suffer as much as they normally would. I agree that it is good that it is a law against euthanasia, because it does help prevent abuse and protect others. Slippery slope to legalize murder is something that should not be tolerated. Especially with regard to taking life, slippery slope arguments have long been a feature of the ethical landscape, used to question the moral permissibility of all kinds of acts (procon.org)†¦ In my opinion it is giving people a reason to want to die only because they consent to it because they have less than a certain time to live. No one knows the day and time that they are going to die unless they commit suicide and still if they do that that they do not know the time they can only assume how long it will take to die, that is just like the doctors giving patients less than a week to survive and they live and extra month so euthanasia is nothing positive as well as the slippery slope to be legalized. If terminating life is a benefit, the reasoning goes, why should euthanasia be limited only to those who can give consent? Why need we ask for consent (procon.org)? If the slippery slope to legalize murder is so right why does it cost for the insurance company to pay for it and why should they even be in the hospital using up space that someone else that needs and wants a chance at life could be at. The people that want to kill themselves should just go ahead and do it at home and save everyone the time and money it cost to get euthanasia. Not trying to be rude about it. Hippocratic Oath and prohibition of killing the much-quoted reference to ‘do no harm’ is also in need of explanation. Does not doing harm mean that we should prolong a life that the patient sees as a painful burden? Surely, the ‘harm’ in this instance is done when we prolong the life, and ‘doing no harm’ means that we should help the patient die (procon.org)? Surely not, we should not kill someone because they are in pain we should do our best to make sure that patient is as comfortable as possible and there is plenty of medicine out there that can do the job of making people comfortable instead of killing them. Like I said previously that if God wanted them to die then he would make them die of natural causes not because of euthanasia, which is not the way to doing things in my eyes. You are causing more pain on them by trying to end their life because you do not know if the way they die will be a pain free death with the euthanasia it could choke them or it could cause them tremendous pain before they die nothing on earth is pain free. Doctors are made to save lives not take them, that is their oath and that is what they should do is save the patient and keep them as pain free as possible to make their life a lot more comfortable. I will neither give a deadly drug to anybody if asked for it, nor will I make a suggestion to this effect’†¦ In forswearing the giving of poison when asked for it, the Hippocratic physician rejects the view that the patient’s choice for death can make killing him right (procon.org). Government involvement in end of life decision, when do we withhold which therapies and allow nature to take its course? When are we, through our own indecision and fears of mortality, allowing wondrous medical methods to perversely prolong the dying rather than the living (procon.org)? I think that we as medical people should prolong life as long as we can because the health care business is about taking care of the ill, elderly, and people with disabilities. Once the medicine starts not to work any longer then it is up to that person and family to request that they no longer get any medication (treatment) and allow them to die a natural life even if that means them dying in pain. That is the only time that I feel that a person should stop trying to prolong life is when nothing else is working for them and they are ready to suffer the pain to die a natural death. Euthanasia is definitely not the answer. However, I think that it sad that the government has to make decisions on infants and elderly people with disabilities that cannot stand up for themselves and make the decision in a way they are just kind of treated like a number, or who they think will live the longest will get to live and the people that cannot make it to live they are wrote off. Palliative (end of life) care, every appropriate palliative option available must be discussed with the patient and, if reasonable, tried before a request for assisted death can be accepted (pro con.org)†¦ And even then when everything is done that needs to be done physicians cannot assist in suicide or euthanasia they can only cute off the treatment and let them die a natural life. There are very few hospice facilities, very little in the way of organized hospice activity, and few specialists in palliative care, although some efforts are now under way to try and jump-start the hospice movement in that country (procon.org). They have very limited options once they get to this point of life. Healthcare spending implications, considering the way we finance healthcare in the United States, it would be hard to make a case that there is a financial imperative compelling us to adopt physician-assisted suicide in an effort to save money so that others could benefit (procon.org).. In so many ways that sounds so harsh but the reality of it is true. If it was legal for physicians to assist in suicide then they are saying that more people could be helped due to the fact that they are killing people off to save more money for others to be taken care of. In a way they are saying that they are saving money from people with terminally ill disease will make it better for the healthier person, which is just my opinion and what I am getting from the information. Savings to governments could become a consideration. Drugs for assisted suicide cost about $35 to $45, making them far less expensive than providing medical care. This could fill the void from cutbacks for treatment and care with the ‘treatment’ of death (procon.org). I did not know that it cost as less as $35 to kill someone off, that is sad. But it will save a lot of money in the end. However, I am still against physician assisted suicide and euthanasia. Social groups at risk of abuse, those who died by physician-assisted suicide were more likely to be college graduates, more likely to be Asian, somewhat younger, more likely to be divorced, and more likely to have cancer or amytrophic lateral sclerosis†¦ the reason for more people with cancer wanting assisted suicide or euthanasia is because they know that there is ultimately no cure for this disease and they feel like they want to skip out on all the pain before it gets that bad. Moreover, although 2.6 percent of Oregonians are African American, no African American patients have chosen assisted suicide (procon.org). Since I am African American I see that those of my ethnicity have the same views as I do about physician assisted suicide and euthanasia in Oregon where it is legal for this to happen. It just shows that just because you live in a state that allow these things to happen does not mean that everyone believes in going out (dying) like that, they as well want to get the best treatment they can get until there is no more treatment that can get done. But even if they wanted to get it done they have to say it and have it in writing a certain amount of time within a certain amount of days for any of this to happen. Religious concerns, some wonder if it is right for you to commit suicide or if it’s okay to ask someone to take you out of your misery which is euthanasia. Well it is not right why put that sin on yourself and then why go ahead and involves someone else in your sin to get them to sin for your benefit? That is wrong on all kind of accounts. If you think that you want to do something that is morally wrong then you go ahead and do that, but do not involve an innocent person into the situation because we are all held accountable for our sins, this just goes off my beliefs and background. But Catholic leaders and moral teachers, they believe that life is the most basic gift of a loving God- a gift over which we have stewardship but not absolute dominion. Our tradition, declaring a moral obligation to care for our own life and health and to seek such care from others, recognizes that we are not morally obligated to use all available medical procedures in every set of circumstances. But that tradition clearly and strongly affirms that as a responsible steward of life one must never directly intend to cause one’s own death, or the death of an innocent victim, by action or omission (procon.org)†¦ both of our views seems to match up, so do you think it is right or wrong? Living wills can be used to refuse extraordinary, life-prolonging care and are effective in providing clear and convincing evidence that may be necessary under state statutes to refuse care after one becomes terminally ill (procon.org). It is always a good thing to have a living will so that your plans can be carried out by your family. Having this document will cut out a lot confusion and questionable decisions because you have documentation off everything. Without a living will then there is where the problems come from and that’s when the medical office staff have to get involved in it as well as other authorities. In Texas, where I live physician assisted suicide is illegal and I think that it should remain that way. Because there is no need for a doctor to help you commit suicide just because you are uncomfortable in life. That’s just like making regular suicide legal and not doing anything to those people that are trying to harm themselves when they really need a doctor to help them and care for them which is what doctors are supposed to do. In Texas it is illegal for physician assisted suicide. It is considered a class c misdemeanor if no suicide or bodily injury results, which means that they attempted to commit suicide but it did not go right. But if it does go right and the doctor helps kill the patient then it is a state jail felony, which means that the suicide was attempted with bodily injury. Then after that I randomly decided to pick Minnesota as my other state to see what the differences were in laws. Again it is illegal for physician assisted suicide in Minnesota and the conditions are way harder than in Texas. In Minnesota you receive up to 15 years in prison and/or a fine up to 30,000 if suicide results; up to seven years in prison and/or a fine up to 14,000 if attempted suicide results. The differences between the two are fines and different types of cases, in Texas it could be a class c misdemeanor whereas in Minnesota you will go to jail or pay the fines. In conclusion, you have seen and read all of the information above and it clearly states that I am against physician assisted suicide or euthanasia. It is morally wrong to kill someone and it is morally wrong to kill someone else to take their pain away. Minnesota laws are a lot stricter than Texas laws for as physician assisted suicide and euthanasia. Which I thought Texas would be where I live, would have the stronger laws with the harsher punishment which surprised me. I learned a lot throughout this paper and learned that there is a right and a wrong way to do things in the medical field and you have to follow command. It is your duty to protect and save lives rather than end them. I do however; agree that it is right to die a natural life. REFERENCES Dictionary.com (2013) Retrieved from: http://dictionary.reference.com/ (n.d.)(2010) Retrieved from: http://www.medicalnewstoday.com/articles/182951.php (n.d.) Retrieved from: http://www.pregnantpause.org/euth/types ProCon.org (2013) Retrieved from: http://euthanasia.procon.org/view.resource.php?resourceID=000126

Italian Verb Conjugations Nuotare