Chemistry revision notes Essay Example for Free

Chemistry revision notes Essay The oxidation state or oxidation number, is a value assigned to a chemical species which represents its actual or nominal electrical charge. The oxidation number in a free or uncombined element is zero. This means that, metallic magnesium has an oxidation number of zero, and chlorine in Cl2 form has an oxidation state of zero. For simple ionic compounds, the oxidation state of the single atom ions is simply the charge on the ions. In most compounds the oxidation number for hydrogen is +1 and for oxygen is -2. The exceptions include the hydrides (the oxidation state is -1) and the peroxides (the oxidation state for oxygen is -1). In the compounds, halides usually have the oxidation number -1. The sum of all the oxidation numbers in a compound have to be equal to zero. The sum of all the oxidation states in a complex ion is the same as the charge on the ion. Semiconductors A covalent element such as silicon or germanium which has a higher conductivity than that of a typical non-metal but a much lower conductivity than that of a metal is described as a semiconductor. Semiconductors are also referred to as metalloids and they occur at the division between metals and non-metals in the Periodic Table. Key facts : 1. The electrical conductivity of semiconductors increases with increasing temperature. 2: Doping pure crystals of silicon or germanium with certain other elements produces 2 types of semiconductors: n- type and p-type semiconductors. The addition of small quantities of certain substances to pure silicon greatly enhance its conductivity and makes possible the construction of electronic devices. This controlled addition of impurities is called ‘doping’. 1. doping pure silicon with phosphorus or arsenic (group 5 elements) these elements have 5 valence electrons, a few of the silicon atoms are replaced by P, As atoms 1 electron is left over after the 4 bonds have been formed. The extra electron is free to conduct an electric current and the phosphorus-doped silicon becomes a conductor called n-type. B. doping with boron or aluminium (group 3 elements). By doping with an element having 3 valence electrons some of the silicon atoms are replaced by boron atoms, but because each boron has only 3 electrons, one of the four bonds to each boron atom has only 1 electron in it. We can think of this as a vacancy or hole in the bonding orbital. An electron from a neighbouring atom can move in to occupy this vacancy. As a result of this movement this type of conductor is called p-type. Superconductors 1. Superconductors are a special class of materials that have zero electrical resistance at temperatures near absolute zero. 2. Achieving temperatures near absolute zero is difficult and costly so application of superconduction at these temperatures is impractical. 3. Recently superconductors have been discovered which have zero resistance up to temperatures above the boiling point of liquid nitrogen- temperatures which are less costly to attain. 4. Superconductors may have a future applications in power transmission and electrically powered forms of transport.

Crime And The Black Market In Modern Day China :: essays research papers

Crime and the Black Market in Modern Day China With a population of approximately 1,203,097,268 people , China, who has the world's largest population, also has the world's fastest growing black market and crime problem. In China, crime rates have been climbing an estimated 10 percent a year since the early 1980s . China is a country that is currently experiencing both political and economic instability. Economic reforms that have been put in place by the government have only widened the income gap, creating a middle class with money and a lower class of newly poor. With an ever increasing size in this gap of income distribution and the relative ease of making money through black market sales, it is no wonder more and more Chinese are turning to a life of commonly accepted and profitable crime. Thomas Jefferson once said, "he who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me." Unfortunately, Thomas Jefferson lived in a different time. He lived in a time when piracy was not as evident and intellectual property was not worth so much. In China, the largest crime which is currently occurring is intellectual piracy. Unlike the pirates of old who plundered the merchant vessels and ports of the South China Sea, modern day pirates are more interested in illegal replication of intellectual rights. From music compact discs to computer software to films to best selling novels, The Chinese black market is a virtual warehouse of "plundered goods". It is estimated that there are at least thirty illegal high tech factories in China that can churn out over 20,000 optical discs a day. America's Microsoft estimates that 98 out of every 100 of its software programs being used in China are illegal copies . Because of these statistics, and because this only amounts to a small amount of the estimated piracy which occurs in China, program manufacturers, worldwide, are lobbying the Chinese government to impose stricter standards and greater restrictions upon the distribution and sale of illegal intellectual rights. In July of 1996, investigators from Microsoft led Chinese officials to a plant near Guilin in Guanxi Province, where they found 5700 bootleg windows CDs. The plant had four production lines. Three of them were operated around the clock. It was estimated that this particular plant churned out 20,000 illegal copies of Microsoft programs a day. A trade report to Congress from the Trade office cites China as the worst violator of United States - copyrighted intellectual property. The report, which came days after

Ir and Globalization

Ir and globalization CONENT: Introduction Body 1. What is Globalization and how it is related with the International Relations; 2. Advantages and Disadvantages of the Globalization; 3. Effectiveness of the Globalization Conclusion NTRODUCTION In my work I talk about the Globalization and its relation with the Globalization where I dwelled upon the Globalization. In the second part I did survey and focused on the advantages and disadvantages of globalization as the statistics show. After hammering out the two factors I wrote about de facto effectiveness of the Globalization and at the end I stated my estimation and conclusion.International Relation and Globalization As more nations, people, and cultures adapt to the ever changing international community, diplomats, politicians, and representatives must meet and deal with accordingly to the needs and wants of nations. Diplomacy can be exerted in many forms; through peace talks, written constitutions, field experiences, etc. Culture is a familiar term and remains unchanged by definition. However, globalization and international relations have constantly altered culture both positively and negatively.Globalization increases worldwide technology, and the readability of fast, effective communication and consumption of popular products. Globalization links cultures and international relations on a variety of levels; economics, politically, socially, etc. International relations have used globalization to reach its goal: of understanding cultures. International relations focus on how countries, people and organizations interact and globalization is making a profound effect on International relations. Understanding culture, globalization, and international relations is critical for the future of not nly governments, people, and businesses, but for the survival of the human race. In today’s increasingly interdependent and turbulent world, many of the leading issues in the news concern international affairs. Whethe r it is the continuing impact of globalization, Globalization – the process of continuing integration of the countries in the world – is strongly underway in all parts of the globe. It is a complex interconnection between capitalism and democracy, which involves positive and negative features, that both empowers and disempowers individuals and groups.From the other hand Globalization is a popular term used by governments, business, academic and a range of diverse non-governmental organizations. It also, however, signifies a new paradigm within world politics and economic relations. While national governments for many years dictated the international political and economic scene, international organizations such as the World Bank, International Monetary Fund and the World Trade Organization have now become significant role players. In this â€Å"Global Village† national governments have lost some of their importance and perhaps their powers in favour of these maj or international organizations.As a process of interaction and integration among people, companies and governments of different nations Globalization is a process driven by the International Trade and Investment and aided by Information technology. This process on the environment on culture, on political system, on economic development and prosperity, and on human physical well-being in societies around the world. Advantages and Disadvantages of Globalization Globalization has a range of advantages while it has also disadvantages. The Advantages include GDP Increase; statistics shows that GDP in developing countries has increased twice as much as before.Unemployment is reduced. Education has increased. Competition on Even Platform: The Companies all around the world are competing on a single global platform which allows better options o consumers. It increased fee trade between nations; The Corporations have greater flexibility to operate across borders. Global mass media ties the w orld together. Increased flow of communications allows vital information to be shared between individuals and corporations around the world. It increases in environmental protection in developed nations. Spread of democratic ideas to developed nations. Reduced cultural barriers ncreases in the global village effect. The Disadvantages are considered to be Uneven Distribution of Wealth, Income Gap Between Developed and Developing Countries, where the wealthof developed countries continues to grow twice as much as the developing world. Next disadvantage is Different Wage Standards for Developing Countries, which is explained by the following fat that the technology worker may get more value for his work in a developed country than a worker in a developing country thus there are in the later many dynamic, industrious and enterprising people who are well educated and ready to work with rigor.The reveal of Globalization is also considered as a disadvantage which is explaining by future fa ctors such as war that can be demand the reveal of the globalization and current process of globalization may just be impossible to reverse. There is also another aspect of disadvantage of globalization in media sphere. The threat that control of world media by a handful of corporations will limit cultural expression. And the final in my estimation is the chance of reactions for globalization being violent in an attempt to preserve cultural heritage.Effects of Globalization With the roster of the mentioned disadvantages and advantages Globalization culminates also effective facts. The following are considered the Effects of Globalization; * enhancement in the information flow between geographically remote locations * the global common market has a freedom of exchange of goods and capital * there is a broad access to a range of goods for consumers and companies * worldwide production markets emerge free circulation of people of different nations leads to social benefits * global envi ronmental problems like cross-boundary pollution, over fishing on oceans, climate changes are solved by discussions * more trans border data flow using communication satellites, the Internet, wireless telephones, etc. * international criminal courts and international justice movements are launched * the standards applied globally like patents, copyright laws and world trade agreements increase * corporate, national and sub-national borrowers have a better access to external finance * worldwide financial markets emerge multiculturalism spreads as there is individual access to cultural diversity. This diversity decreases due to hybridization or assimilation * international travel and tourism increases * worldwide sporting events like the Olympic Games and the FIFA World Cup are held * enhancement in worldwide fads and pop culture * local consumer products are exported to other countries * immigration between countries increases cross-cultural contacts grow and cultural diffusion takes place * there is an increase in the desire to use foreign ideas and products, adopt new practices and technologies and be a part of world culture * free trade zones are formed having less or no tariffs * due to development of containerization for ocean shipping, the transportation costs are reduced * subsidies for local businesses decrease * capital controls reduce or vanquish * there is supranational recognition of intellectual property restrictions, i. e. , patents authorized by one country are recognized in another CONCLUSIONIn conclusion I would like to state m estimation that despite all the formidable obstacles and stumbling blocks the effectiveness of the Globalization and cohesive efforts of people and the government will help to stand a positive stead prevail over the disadvantages. It will fortify to prevent migration which is inherent in third-world and back water countries and reduce social inequality which in its turn will benefit the advantages of the Globalization. A ll these mentioned facts are time-consuming and labour-intensive process but it will distinctly fortify and develop the Globalization. Ir and Globalization Ir and globalization CONENT: Introduction Body 1. What is Globalization and how it is related with the International Relations; 2. Advantages and Disadvantages of the Globalization; 3. Effectiveness of the Globalization Conclusion NTRODUCTION In my work I talk about the Globalization and its relation with the Globalization where I dwelled upon the Globalization. In the second part I did survey and focused on the advantages and disadvantages of globalization as the statistics show. After hammering out the two factors I wrote about de facto effectiveness of the Globalization and at the end I stated my estimation and conclusion.International Relation and Globalization As more nations, people, and cultures adapt to the ever changing international community, diplomats, politicians, and representatives must meet and deal with accordingly to the needs and wants of nations. Diplomacy can be exerted in many forms; through peace talks, written constitutions, field experiences, etc. Culture is a familiar term and remains unchanged by definition. However, globalization and international relations have constantly altered culture both positively and negatively.Globalization increases worldwide technology, and the readability of fast, effective communication and consumption of popular products. Globalization links cultures and international relations on a variety of levels; economics, politically, socially, etc. International relations have used globalization to reach its goal: of understanding cultures. International relations focus on how countries, people and organizations interact and globalization is making a profound effect on International relations. Understanding culture, globalization, and international relations is critical for the future of not nly governments, people, and businesses, but for the survival of the human race. In today’s increasingly interdependent and turbulent world, many of the leading issues in the news concern international affairs. Whethe r it is the continuing impact of globalization, Globalization – the process of continuing integration of the countries in the world – is strongly underway in all parts of the globe. It is a complex interconnection between capitalism and democracy, which involves positive and negative features, that both empowers and disempowers individuals and groups.From the other hand Globalization is a popular term used by governments, business, academic and a range of diverse non-governmental organizations. It also, however, signifies a new paradigm within world politics and economic relations. While national governments for many years dictated the international political and economic scene, international organizations such as the World Bank, International Monetary Fund and the World Trade Organization have now become significant role players. In this â€Å"Global Village† national governments have lost some of their importance and perhaps their powers in favour of these maj or international organizations.As a process of interaction and integration among people, companies and governments of different nations Globalization is a process driven by the International Trade and Investment and aided by Information technology. This process on the environment on culture, on political system, on economic development and prosperity, and on human physical well-being in societies around the world. Advantages and Disadvantages of Globalization Globalization has a range of advantages while it has also disadvantages. The Advantages include GDP Increase; statistics shows that GDP in developing countries has increased twice as much as before.Unemployment is reduced. Education has increased. Competition on Even Platform: The Companies all around the world are competing on a single global platform which allows better options o consumers. It increased fee trade between nations; The Corporations have greater flexibility to operate across borders. Global mass media ties the w orld together. Increased flow of communications allows vital information to be shared between individuals and corporations around the world. It increases in environmental protection in developed nations. Spread of democratic ideas to developed nations. Reduced cultural barriers ncreases in the global village effect. The Disadvantages are considered to be Uneven Distribution of Wealth, Income Gap Between Developed and Developing Countries, where the wealthof developed countries continues to grow twice as much as the developing world. Next disadvantage is Different Wage Standards for Developing Countries, which is explained by the following fat that the technology worker may get more value for his work in a developed country than a worker in a developing country thus there are in the later many dynamic, industrious and enterprising people who are well educated and ready to work with rigor.The reveal of Globalization is also considered as a disadvantage which is explaining by future fa ctors such as war that can be demand the reveal of the globalization and current process of globalization may just be impossible to reverse. There is also another aspect of disadvantage of globalization in media sphere. The threat that control of world media by a handful of corporations will limit cultural expression. And the final in my estimation is the chance of reactions for globalization being violent in an attempt to preserve cultural heritage.Effects of Globalization With the roster of the mentioned disadvantages and advantages Globalization culminates also effective facts. The following are considered the Effects of Globalization; * enhancement in the information flow between geographically remote locations * the global common market has a freedom of exchange of goods and capital * there is a broad access to a range of goods for consumers and companies * worldwide production markets emerge free circulation of people of different nations leads to social benefits * global envi ronmental problems like cross-boundary pollution, over fishing on oceans, climate changes are solved by discussions * more trans border data flow using communication satellites, the Internet, wireless telephones, etc. * international criminal courts and international justice movements are launched * the standards applied globally like patents, copyright laws and world trade agreements increase * corporate, national and sub-national borrowers have a better access to external finance * worldwide financial markets emerge multiculturalism spreads as there is individual access to cultural diversity. This diversity decreases due to hybridization or assimilation * international travel and tourism increases * worldwide sporting events like the Olympic Games and the FIFA World Cup are held * enhancement in worldwide fads and pop culture * local consumer products are exported to other countries * immigration between countries increases cross-cultural contacts grow and cultural diffusion takes place * there is an increase in the desire to use foreign ideas and products, adopt new practices and technologies and be a part of world culture * free trade zones are formed having less or no tariffs * due to development of containerization for ocean shipping, the transportation costs are reduced * subsidies for local businesses decrease * capital controls reduce or vanquish * there is supranational recognition of intellectual property restrictions, i. e. , patents authorized by one country are recognized in another CONCLUSIONIn conclusion I would like to state m estimation that despite all the formidable obstacles and stumbling blocks the effectiveness of the Globalization and cohesive efforts of people and the government will help to stand a positive stead prevail over the disadvantages. It will fortify to prevent migration which is inherent in third-world and back water countries and reduce social inequality which in its turn will benefit the advantages of the Globalization. A ll these mentioned facts are time-consuming and labour-intensive process but it will distinctly fortify and develop the Globalization.

When Is the Best Time to Send Graduation Announcements

Sending college graduation announcements may not be a huge priority for you — after all, youve got a lot going on as you prepare to graduate from and live life after college — but if you want to spread the news of your accomplishment, its important to do it in a timely manner, especially if you want people to attend the ceremony. So when exactly should you get your college graduation announcements in the mail? Give Yourself Plenty of Time Your timeline depends on the purpose of your announcement. If your announcement also serves as an invitation, the card should arrive two weeks prior to the event, at the very least. That means its a good idea to drop them in the mail about a month out from graduation day, if not earlier. More often, graduation announcements are just that — announcements. In that case, you can plan on sending them no earlier than a month out. Its acceptable for graduation announcements to arrive two weeks prior to two weeks after your graduation date. Remember, thats just the timeline for sending the announcements. Give yourself ample time to collect all the addresses you need, as well as shop for, choose and order the stationery. At that point, youre subject to the sellers order deadlines, production timelines, and shipping options. If youre a procrastinator, you may be able to save some time by ordering pre-addressed envelopes or address labels (though that will cost more). And if youre really under a time crunch, you could even spring for priority mail postage — again, thatll cost you. Ideally, you want to allow enough time for 1) the announcement to arrive at someones house, 2) the person to read your announcement 3) buy a congratulations card, if they wish and 4) the congratulatory card or gift to arrive back at your school. One month usually allows plenty of time for this process to take place. If the timing is such that you dont think youll be at school by the time congrats cards arrive, consider putting your post-grad address (or your parents address) on the envelope so nothing gets lost. If youd rather not deal with that, you can add a no gifts, please line to your graduation announcement. Of course, thats no guarantee people wont send you anything, so take the time to think about the best return address to put on the envelopes. Other Things to Consider About Graduation Announcements If its already closer than one month until your graduation, dont worry: Just send out your announcements as soon as you can. Keep in mind its acceptable to send out your announcements after youve already graduated, as long as not too much time has passed between your graduation date and the delivery of the announcement. Ultimately, its up to you when you want them to arrive. Finally, remember that you dont have  to send graduation announcements if you dont have the time or dont want to spend the money doing so.