Chemistry Class 12 Essays

Chemistry Class 12 Essays Chemistry Class 12 Essay Chemistry Class 12 Essay HIGHER SECONDARY MODEL EXAMINATION HSE II Max. marks: 60 CHEMISTRY Time: 2. 45 hrs General instructions All questions are compulsory Cool-off time is 15 minutes 1] Defects modify the properties of crystals [4 marks] A] Give differences between Schottky and Frenkel defects [2. 0] B] On heating zinc oxide becomes yellow in colour. Why? [1. 0 ] C] Alkali metal halides on heating in presence of alkali metal produce characteristic colours. Give reason [1. 0] 2] Colligative properties depend on the number of solute particles in solution [4 arks] A] Give the name of colligative property suitable for the measurement of molar mass of starch[l . ] B] Give reasons for abnormal colligative properties [1. 0] C] Represent elevation in boiling point graphically [ 2. 0] 3] Cells are used for different purposes [4 marks] A] Differentiate between primary and secondary cells [ 1. 0] B] The voltage given by mercury cell is contant . Why ? [1. 0] C] What are fuel cells ? Give thei r two advantages . [2. 0] 4] Chemical kinetics deals with rates of chemical reactions [4 marks] A] Give two differences between order and molecularity of a chemical reaction [1. B] Draw a graphical representation to show the effect of a positive catalyst on the activation energy[l . 0] C] How rate of reaction increases with increase in temperature ? [1. 0] D] What is the half life of a first order reaction whose rate constant is 200 s-l? [1. 0] 5]Colloids are neterogeneous systems 13 marks] 2 A] Differentiate between Tyndall effect and Brownian movement [2. 0] B] State Hardy- Schulze rule for the coagulation of colloids [1. 0] 6]Metallurgy deals with the extraction of a metal from a suitable ore[3 marks] A] Which method of purification is epresented by the given equation? 1. 0] B] Differentiate between roasting and calcination [1. 0] C] All ores are minerals but all minerals are not ores . Justify the statement [1. 0] 7] Elements belonging from group 13 to group 18 are known as p-bl ock elements [5 marks] A] Draw the structures of phosphorous and sulphur molecules [1. 0] B] What are interhalogen compounds . Give example[l . 0] C] a. Account for the high viscous nature and boiling point of sulphuric acid[l . 0] b. Why are all the halogens usually coloured? [l . 0] D] Why are all bonds in PC15 molecule not equivalent? 1. ] 8]Elements from group 3 to group 12 are known as d block elements [4 marks] A] Explain the following observations: (i) Transition elements generally form coloured compounds. [l . 0] (it) Mercury is a liquid at room temperature [1. 0] B] Give the preparation of potassium permanganate from pyrolusite [2. 0] 9] Co- ordination compounds are addition compounds [4 marks] A] A coordination compound has the formula PtC14 . 3NH3. It does not liberate ammonia, but precipitates chloride ion as silver chloride. [2. 0] i. Write the IUPAC name and the structural formula of the compound. . What is the secondary valency of the compound in part (i)? B] Write do wn the II-PAC nomenclature of the following compounds: [2. 0] 3 i. [C0C12 (erl)2] S04 cr OH cr (NH3)5] C15 10] Halogen compounds reactive compounds [4 marks] A] (i) Why is it that haloalkanes are more reactive than haloarenes towards nucleophiles? [l . 0] (ii) Which one of the following reacts faster in an SNI reaction and why? B] Chloroform is kept in amber coloured bottles. Why? [1. 0] C] Differentiate the action of moist and dry silver oxide on bromomethane [1. 0] 1 1] Alcohols are important industrial solvents [4 marks] A] Which of the following alcohols give ketone on oxidation? [l . 0] B] What happens when dehydration of ethanol is carried at a higher temperature of 443 O] C] a] complete tne reaction b. Write all the possible structural isomers of the compound X [1. 0] 12] Aldehydes and ketones are carbonyl compounds [ 5marks] A] Giving reasons, arrange the following carbonyl compounds in the decreasing order of their reactivity in nucleophilic addition reactions. [2. O] B] Give two chemical tests to distinguish between CH3CHO and CH3COCH 3. . 0] C] Give a commercial method to obtain benzaldehyde from toluene. [l . 0] 4 D] Write the IUPAC name of the following compound. [l . 0] 13] Amines are derivatives of ammonia [3 marks ] A] Between ethylamine and ethyl alcohol, which has a higher boiling point and why? [ 1. 0] B]Giving reasons, arrange the given amines in the decreasing order of their basicity in the follow[ 2. 0] 14] Biomolecules are compl ex organic molecules [ 3 marks ] Match the following Glucose Amylose Reducing sugar Sucrose Aldohexose Zwitterion Starch Invert sugar ketohexose Fructose Glycine Linear polymer Amlnoac10 Denaturation Peptide linkage Proteins Sweetest sugar Non-reducing sugar 15] Polymers are macromolecules formed from monomers [ 3 marks ] a. What was the need for developing biodegradable polymers? [l . 0] b. What does PHBV stand for? Give its uses. [l . 0] c. Write the monomer units of Nylon 2-Nylon- 16] Chemistry plays an important role in our day to day life [ 3 marks ] a) State the function along with one example each of: [2. 0] (i) Antihistamines (it) Antioxidants (b) Give two differences between soaps and synthetic detergents [1. 0]

Chapter 11 Reorganization Essay Example | Topics and Well Written Essays - 1000 words

Chapter 11 Reorganization - Essay Example 2. Background Rural/Metro Corporation is considered to be one of the largest private organizations and is engaged with providing emergency ambulance and fire safety services in the US. It operates in more than 21 states in the country and is estimated to provide services to more than 1.5 million emergency calls. Established in the year 1948, the prime motive of Rural/Metro Corporation has been to provide fire protection services in return of a small subscription fee, in those areas where no emergency facilities existed. Gradually, it became one of the largest medical emergency and fire protection providers. Consequentially, it was made public in the year 1993. Currently, it is owned by Warburg Pincus, LLC, a private equity management firm. The prime economic factor that resulted in filing for Chapter 11 by the organization, owed from inappropriate capital structure, which was formed under different economic conditions resulting in huge interest payment to the creditors (Rural/Metro C orporation, 2013; Indystar.com, 2013). 3. Financial Forecast of Rural/Metro Corporation for Five (5) Years Rural/Metro Corporation is considered to be one of the largest and the most consistent performer in the stock market. The organization has been found to implement new strategies every year that helped in making the financial conditions of the organization stronger. But, it was observed that after the acquisition of the organization by Warburg Pincus, LLC, the organization faced financial problems resulting from inappropriate capital structure that further was connoted as the consequence of rapid fluctuation in the economic condition of the country. According to the annual report of Rural/Metro 2010, it was viewed that the total revenue earned by the company amounted to US$ 133,513,000, which was much more in comparison to 2011-2012 (Rural/Metro Corporation, 2013). With reference to the above mentioned data gathered from the annual report of Rural/Metro for three consecutive yea rs i.e. 2010, 2011 and 2012, it can be viewed that lack of proper financial planning and the increasing rate of interest that was to be paid to the creditors, made the organization file for Chapter 11. However, if proper guidelines and planning were made after the reorganization, it can be stated that Rural/Metro would have been in a better financial position for the coming five years (Rural/Metro Corporation, 2013). 4. Evaluation of the Key Debt Reorganization The key type of debt reorganization that the company had selected to pay of the debts was by making agreements with lenders and bondholders. This technique is considered to be one of the best and simplest methods of collecting funds usually by borrowing or through an agreement. It is also worth mentioning that the agreement is done on a mutual understanding between both the parties, which does not make the borrower liable to pay the borrowed money before the time mentioned in the agreement (Indystar.com, 2013; Krueger, 2002). Theoretically, the three types of debt restructuring processes include general debt restricting, troubled debt restricting and corporate debt restricting. Comparatively, corporate debt restricting can be considered as one of the most beneficial methods for creditors. The main reason behind this is that in this method, the creditors either reduce the rate of interests or

Global environment Assignment Example | Topics and Well Written Essays - 1500 words

Global environment - Assignment Example In addition, it addresses how educational leadership practices influence the implementation of effective models that maximize global competitiveness. Leadership ensures flexibility and creates room for adjusting to varying cultures and markets by keeping a global perspective through continual learning. Organizational structures are also adjusted in order to meet the needs of the stakeholders such as clients and partners (Dignam, & Galanis, 2009). Leadership ensures the existence of a balance among the methods required to manage different generations and categories of people effectively. It also measures staff performance by considering outputs so that the expectations of the stakeholders are met (Dignam, & Galanis, 2009). This entails understanding behavioral diversity so that approaches to handling individuals are more creative and diverse. Technological, environmental and business changes that occur globally require leaders to be dynamic and up-to-date with such information so that obsolescence of ideas and methods of operation does not arise. As new ideas, policies and practices come, new and innovative approaches should be considered by leaders in order to meet the demands of the stakeholders (Dignam & Galanis, 2009). Competition is a perpetual practice that requires sound decisions and strategies such as risk taking in order for an organization to remain relevant in the global frontier (Blum & Wey, 2008). Organizations compete for clients, resources, technology and space. With sound and best leadership practices, stakeholders’ needs are met by implementing modern policies and strategies that can compete favorably in the global space. According to Blum and Wey (2008), every organization has a vision enshrined in its goals and objectives and the stakeholders aim at realizing such dreams. With good leadership practices such as staying focused, an

Credit Card Essay Example for Free

Credit Card Essay Credit card has undoubtedly made our lives easy but it is important that you use credit cards in the right way so that you can make the most of it without getting caught in the credit trap. All you have to do is to keep a track of your purchases, remember you payment cycles, try to settle full credit card payments at the end of every month, avoid spending in excess and carry your cards cautiously. If handled properly, credit cards can serve to be very convenient but they can also lead you to a huge debt if misused. So just play carefully with the tiny plastic thing that is placed in your wallet.

Will Fast Food be the Death of Us? Essay -- The Dark Side of Fast Food

The American food industry has evolved in ways that may not be distinguishable to the human palate, but hopefully remain distinguishable to the human conscience. With all the options now available to company executives, citizens must be sure to keep them from abusing their powers and continuing to harm employees, mistreat animals, and kill consumers. The best ways are to promote public discourse and to make the most of the power of the consumer by thoughtfully deciding where to spend their hard-earned dollars. To understand where the fast food industry is today, we must look at the technological advances that allowed it to reach that point. Technology has been an integral force in the rise of the fast food culture. In fact, it was a technological advancement that first brought the fast food industry to life. When the McDonald brothers opened-up their first restaurants, they served people and made a modest profit. However, one day a traveling salesman walked through their door and presented them with the opportunity to buy a machine that would enable them to make five milkshakes at one time. He also offered them the chance to buy other machines that would speed-up food production. Who was this traveling salesman? His name was Ray Kroc. Kroc later offered to buy the rights to the McDonald brother’s restaurants and the deal went through. Kroc outfitted the restaurants with technology that allowed for the mass production of its food. Like Henry Ford automated the automobile manufacturing industry, Ray Kroc can be considered the man who took restaurant food and made it fast food. The next major innovation to contribute to fast food’s development was the automobile. In the 1950s, when owning a car become comm... ...a/GMA0201Obsessed_with_Fast_food.html. Alternet. [2013]. Why Fast Food Costs Too Much. Web. 14 May 2015. http://www.alternet.org/story.html?StoryID=15762. American RadioWorks (2012). Kill Them With Kindness Web. 7 May 2015. http://www.americanradioworks.org/features/mcdonalds/grandin1.html. American RadioWorks [2014]. Ethics Into Action Web. 10 May 2015. http://www.americanradioworks.org/features/mcdonalds/book.html. BBC. [2014]. Fast Food ‘as addictive as heroin.’ Web. 9 May 2015. http://news.bbc.co.uk/2/hi/health/2707143.stm. Kluger, Jeffrey. "Inside the Food Labs." Time. 06 Oct. 2009: 56-60 Schlosser, Eric. (2002) Fast Food Nation: The Dark Side of the All-American Meal. New York: Perennial. Swanson, Ronald. [2013] E. Coli 0157: The Main Cause of Neurodegenerative Disease? Web. 21 May 2015. http://www.ecoli0157.com/ summary.html

Village Volvo

1. Describe Village Volvo’s service package. The service package consists of five points: supporting facility, facilitating goods, information, explicit services and implicit services. †¢Supporting facility: The car repair is based in a new Butler building in a suburban location with four work bays, an office, a waiting area and a storage room. Because of the location Village Volvo considers a shuttle service two or three times a day. The waiting room is equipped with a television se, comfortable chairs, coffee, a soft-drink vending machine, magazines and the local newspaper. †¢Facilitating goods: Facilitating goods are on the one hand the parts which are used to replace worn-out parts of the cars and on the other hand goods which are provided in the waiting room like coffee, soft-drinks, magazines and the local newspaper. †¢Information: The client and the mechanic who will be working on the vehicle discuss the problems the client has noticed and sometimes they may take a short test drive. Another source of information is the Customer Care Vehicle Dossier (CCVD) which is a continuing file of each vehicle the garage services. The CCVD can help the mechanic to diagnose problems and provides a convenient record if a vehicle is returned for warranty service on an earlier repair. †¢Explicit services: On the basis of 22 years of training and experience with the local Volvo dealer, they have earned a respected reputation and they offer any repair service on Volvo cars. For services which are not part of Village Volvo the owners developed a network of other service providers who can satisfy the customers’ needs. Care is taken throughout the repair process to keep the car clean, and the inside is vacuumed as a courtesy before pickup. After the repairs are finished, the vehicle is taken for a short test drive. Another explicit service is the availability. They have set aside specific â€Å"drop in† times (3 to 5 PM Wednesdays and 8 to 10 AM Thursdays) each week when clients may drive in for quick routine services. Between 7 and 8 AM and 5 and 6 PM the two owner-mechanics do not repair, because they want to be available for customer contact. †¢Implicit services: Implicit services include good attitude of mechanic, the comforts of the waiting area, and the convenience of the services offered. Mechanics take time to discuss problems with their clients; they even take a short test drive with the finished car and inform the customer about any other steps necessary whilst reparation. Although the customer will be consulted before any work other than the agreed-on job is done. Village Volvo 1. Describe Village Volvo’s service package. The service package consists of five points: supporting facility, facilitating goods, information, explicit services and implicit services. †¢Supporting facility: The car repair is based in a new Butler building in a suburban location with four work bays, an office, a waiting area and a storage room. Because of the location Village Volvo considers a shuttle service two or three times a day. The waiting room is equipped with a television se, comfortable chairs, coffee, a soft-drink vending machine, magazines and the local newspaper. †¢Facilitating goods: Facilitating goods are on the one hand the parts which are used to replace worn-out parts of the cars and on the other hand goods which are provided in the waiting room like coffee, soft-drinks, magazines and the local newspaper. †¢Information: The client and the mechanic who will be working on the vehicle discuss the problems the client has noticed and sometimes they may take a short test drive. Another source of information is the Customer Care Vehicle Dossier (CCVD) which is a continuing file of each vehicle the garage services. The CCVD can help the mechanic to diagnose problems and provides a convenient record if a vehicle is returned for warranty service on an earlier repair. †¢Explicit services: On the basis of 22 years of training and experience with the local Volvo dealer, they have earned a respected reputation and they offer any repair service on Volvo cars. For services which are not part of Village Volvo the owners developed a network of other service providers who can satisfy the customers’ needs. Care is taken throughout the repair process to keep the car clean, and the inside is vacuumed as a courtesy before pickup. After the repairs are finished, the vehicle is taken for a short test drive. Another explicit service is the availability. They have set aside specific â€Å"drop in† times (3 to 5 PM Wednesdays and 8 to 10 AM Thursdays) each week when clients may drive in for quick routine services. Between 7 and 8 AM and 5 and 6 PM the two owner-mechanics do not repair, because they want to be available for customer contact. †¢Implicit services: Implicit services include good attitude of mechanic, the comforts of the waiting area, and the convenience of the services offered. Mechanics take time to discuss problems with their clients; they even take a short test drive with the finished car and inform the customer about any other steps necessary whilst reparation. Although the customer will be consulted before any work other than the agreed-on job is done.

Night Elie Weisel Essay - 658 Words

â€Å"Never shall I forget that night, the first night in camp, which has turned my life into one long night, seven times cursed and seven times sealed. Never shall I forget that smoke. Never shall I forget the little faces of the children, whose bodies I saw turned into wreaths of smoke beneath a silent blue sky. Never shall I forget those flames which consumed my faith forever. Never shall I forget that nocturnal silence which deprived me, for all eternity, of the desire to live. Never shall I forget those moments which murdered my God and my soul and turned my dreams to dust. Never shall I forget these things, even if I am condemned to live as long as God Himself. Never† (Wiesel 43). As he reflects upon his horrendous first night in†¦show more content†¦As mentioned before, Wiesel wrote elsewhere, â€Å"My anger rises up within faith and not outside it.† Eliezer reflects this position, which is particularly visible throughout this passage. Despite saying he has lost all faith, it is clear that Eliezer is actually struggling with his faith and his God. Just as he is never able to forget the horror of â€Å"that night,† he is never able to reject completely his heritage and his religion. Elie, the narrator, is a deeply spiritual and passionate child growing up in Eastern Europe. He studies the Torah and the Cabala. He goes to the synagogue and weeps. He actually weeps when he prays, that is how deep and passionate is his faith in God. Through the process of de-humanization instituted by the Nazis, Elie rapidly loses his faith in God. Now, I wish to be clear. At no point does he stop believing in God. Rather, he loses his faith that God is an omnipotent and all-loving God. He sees what is happening all around him to Gods own chosen people, and suffers the destruction of his lifes most important paradigm, to be replaced with a cynicism and heroic humanism. Elie has not stopped believing in God. But, for him, the God whom he loved and adored has been hung and executed. His innocentShow MoreRelatedEssay on Reflections on Night, by Elie Weisel836 Words   |  4 PagesNight, by Elie Wiesel, is an autobiographical novel which tells the story of Eliezer, a Jewish teenager from the small Transylvanian village of Sighet. He is 15 when transported to Auschwitz, Buna, and finally Buchenwald with his father during World War II. Eliezer loses his faith, argues with God, and is sustained only by the need to care for his father. As well as the appalling memory of the Holocaust resurrected in this novel, Night bears with it the unforgettable implication that this atrocityRead MoreNight by Elie Weisel Book Analysis1782 Words   |  8 PagesNight Analysis Elie Wiesel’s use of language and structure emphasizes the meaning and tone of the selection. Closely examine the memoir and your annotations to find examples of these features of language and structure. 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Elie Wiesel’sRead MoreNight, By Elie Wiesel1362 Words   |  6 Pagesright questions.† (5) In Elie Wiesel s novel â€Å"Night,† we find the horrific life story of a father and son during the period of the devastating Holocaust. Elie and his father need to unite in order to survive through the excruciation. We find a transition of indifference by Elie during his Nobel Peace Prize. From his love for life to not caring about anything, Elie matures as the book progresses. He learns to value his father and stick together. In â€Å"Night,† Elie Weisel utilizes the fear of survivingRead MoreSurviving Hitler: a Comparison of Night and the Pianist in the Portrayal of the Holocaust1321 Words   |  6 Pagesuniversally interpreted as referring to the Jewish victims of the Holocaust, though estimates by historians using, among other sources, records from the Nazi regime itself, range from five million to seven million (Duiker et al. 431-436). 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The narrative Night by Elie Wiesel illustrates humanity in one of the darkest periods of history, to abandon humanity to survive vs keeping it from spiraling down into hopele ssness. As Eliezer struggles to survive against starvation and abuse, he also grapples with the destruction of his faith in God’s justice and battles with the darker sides of himself.Throughout the novel, Eliezer feels a conflict between protecting his father who