Water Analysis Essays - Intermolecular Forces, Inorganic Solvents

Water Analysis Water Water is used all around us everyday and is essential in the maintenance of life. Water is a requirement of the human body for the smooth functioning of body systems. Substituting other fluids for water can negatively impact ones health, especially in the case of children. Children who drink juices in the place of water have a tendency to be overweight and are at risk for other problems associated with normal growth. For teens and adults, reliance on fluids other than water also has side effects. For example, the sugar in soda contributes to tooth decay in teens, while in adults, the phosphoric acid can ultimately diminish bone density. Water is an odorless, tasteless, and transparent liquid. It may look colorless in small amounts, but in large amounts such as an ocean, it looks slightly blue. Water is the most common liquid on earth. Three-fourths of earths surface is covered with water. Water is made up of two atoms of hydrogen and one atom of oxygen. Each hydrogen atom is connected to the oxygen atom by a covalent bond. The two H-O bonds form an angle of about 105 degrees. This arrangement results in a polar molecule. A polar molecule is a molecule with a net positive charge at the hydrogen ends and a net negative charge toward the oxygen end. This substance has a great amount of surface tension. Surface tension is a result of the water molecules clinging tightly together. This surface tension is responsible for causing a leaf to float on top of the water. The only liquid with a greater surface tension than water is mercury. Mercurys atoms are so attracted to each other that they tend not to adhere to anything else. Therefore, mercurys surface is able to hold heavier objects up, unlike any other liquid. Vaporization, or evaporation, is the change of a liquid to a gas. Water has a high heat of vaporization. At waters boiling point, it takes 540 calories to change 1 gram of liquid water into vapor. Hydrogen bonding also plays a role in waters high heat of vaporization. Vaporization comes from the rapid moving molecules. These molecules break loose from the surface and enter the air. The hotter the liquid, the faster the molecules move. Therefore, the hotter the liquid gets, the more vaporization occurs. In order for a water molecule to vaporize, it must break from its hydrogen bonds. This process requires taking heat from its surroundings, which, in turn, cools those surrounding elements. This is one way in which animals and plants stabilize their temperatures. Freezing of water occurs when its density increases. The density increases as the temperature drops. The molecules start to move slower and the space decreases between them. At 0 degrees C, the freezing point of water, the water becomes its hardest, or most stable. Water in solid form takes up a greater amount of volume than water as a liquid. Also, ice is much more dense than liquid, therefore the ice floats in liquid. Water supports many different processes. It is a crucial nutrient in the growth of the human body and is a key element in the stabilization of earths ecosystems. Water is the most abundant liquid on earth and is also the most important. Science Essays

Limiting Reactant Problems in Chemistry

Limiting Reactant Problems in Chemistry A balanced chemical equation shows the molar amounts of reactants that will react together to produce molar amounts of products. In the real world, reactants are rarely brought together with the exact amount needed. One reactant will be completely used up before the others. The reactant used up first is known as the ​limiting reactant. The other reactants are partially consumed where the remaining amount is considered in excess. This example problem demonstrates a method to determine the limiting reactant of a chemical reaction. Problem Sodium hydroxide (NaOH) reacts with phosphoric acid (H3PO4) to form sodium phosphate (Na3PO4) and water (H2O) by the reaction:3 NaOH(aq) H3PO4(aq) → Na3PO4(aq) 3 H2O(l)If 35.60 grams of NaOH is reacted with 30.80 grams of H3PO4,a. How many grams of Na3PO4 are formed? b. What is the limiting reactant?c. How many grams of the excess reactant remains when the reaction is complete?Useful information:Molar mass of NaOH 40.00 gramsMolar mass of H3PO4 98.00 gramsMolar mass of Na3PO4 163.94 grams Solution To determine the limiting reactant, calculate the amount of product formed by each reactant. The reactant the produces the least amount of product is the limiting reactant.To determine the number of grams of Na3PO4 formed:grams Na3PO4 (grams reactant) x (mole of reactant/molar mass of reactant) x (mole ratio: product/reactant) x (molar mass of product/mole product)Amount of Na3PO4 formed from 35.60 grams of NaOHgrams Na3PO4 (35.60 g NaOH) x (1 mol NaOH/40.00 g NaOH) x (1 mol Na3PO4/3 mol NaOH) x (163.94 g Na3PO4/1 mol Na3PO4)grams of Na3PO4 48.64 gramsAmount of Na3PO4 formed from 30.80 grams of H3PO4grams Na3PO4 (30.80 g H3PO4) x (1 mol H3PO4/98.00 grams H3PO4) x (1 mol Na3PO4/1 mol H3PO4) x (163.94 g Na3PO4/1 mol Na3PO4)grams Na3PO4 51.52 gramsThe sodium hydroxide formed less product than the phosphoric acid. This means the sodium hydroxide was the limiting reactant and 48.64 grams of sodium phosphate is formed.To determine the amount of excess reactant remaining, the amount us ed is needed. grams of reactant used (grams of product formed) x (1 mol of product/molar mass of product) x (mole ratio of reactant/product) x (molar mass of reactant)grams of H3PO4 used (48.64 grams Na3PO4) x (1 mol Na3PO4/163.94 g Na3PO4) x (1 mol H3PO4/1 mol Na3PO4) x (98 g H3PO4/1 mol)grams of H3PO4 used 29.08 gramsThis number can be used to determine the remaining amount of excess reactant.Grams H3PO4 remaining initial grams H3PO4 - grams H3PO4 usedgrams H3PO4 remaining 30.80 grams - 29.08 gramsgrams H3PO4 remaining 1.72 grams Answer When 35.60 grams of NaOH is reacted with 30.80 grams of H3PO4,a. 48.64 grams of Na3PO4 are formed.b. NaOH was the limiting reactant.c. 1.72 grams of H3PO4 remain at completion.

Design Patterns - Behavioral, Creational, Structural Research Paper

Design Patterns - Behavioral, Creational, Structural - Research Paper Example There are several classifications of design patterns - this essay focus on three designs, including memento for behavioral patterns, singleton for creational patterns and lastly facade for structural patterns. Memento Pattern This is a software design pattern that has the capability of bringing back an object to its initial state. As a pattern, it allows the initial state of an object to be restored without interfering with the rules of encapsulation. This means that the arising object can be designed appropriately, though it can be restored to its original state. Therefore, memento pattern has the ability of restoring the internal state of an object without breaking the encapsulation rules. As a behavioral pattern, Memento indicates the manner through which communication between entities or classes is achieved (Schmidt, 1997). Basically, the design pattern is popular in applications with â€Å"undo’ functionality. Memento pattern has two participants: the caretaker and the o riginator. The originator restores memento to its internal state while the caretaker guarantees memento safekeeping. According to Gamma et al. (1995), memento does not allow access to other objects other than originator. It has two interfaces, including narrow and wide interface. Caretakers only find the narrow interface and pass memento to other objects while the originator finds the wider interface through which it allows access to data that enabling restoration of the initial state. Benefits and drawbacks Memento pattern has chain of responsibilities that offers great flexibility especially when processing an application. In this case, it manages complex events by dividing the responsibilities into simpler elements that allows a set of classes to behave as a whole. However, the flexibility of this pattern is hard to develop, debug and test. This is because the chain becomes extremely complex. In addition, failure to plan for varied forwarding possibilities could result to message s that lack a handler, hence failing to attract any response. Singleton pattern Singleton is a creation design pattern that ensures only one object of a given class is created. It has only one class that is accessible by clients from identifiable access points. The single class must be extensible and the clients should easily use extended instances without alteration to their codes. Therefore, this pattern is particularly useful when a single object is needed to manage actions across a system. Singleton ensures efficiency when creating numerous identical objects and it uses a particular algorithm that requires a single point of control to interact with a resource that cannot be shared. Benefits and drawbacks The singleton pattern exerts control over the instantiation process and therefore this class has the flexibility to change the instantiation process. In addition, singleton pattern ensures that every object accesses the singleton object and preventing other objects from instanti ating their own copies. However, weaknesses associated with singleton pattern includes introduction a global state into the program. It allows uncontrolled access to the program hence being one of the most used patterns. In this regard, programs that are heavily used are difficult to test. This is because it is not possible to test it without testing other

T-Mobile in Hungary Assignment Example | Topics and Well Written Essays - 750 words

T-Mobile in Hungary - Assignment Example If they find one of the advertisements good, they will choose that supplier. Advertisements targets are always the positional clients. The company is aiming to represent its products and services as the symbol of success. Its subscribers are always smiling, get an excellent quality, and never face any problem. While the struggle is very tough in Hungary, mobile providers struggle for every particular user. That is why T-Mobile (HU) emphasizes that all its subscribers belong to a big family and they made the right decision. They aim to get and keep users through motivating them to brand loyalty. T-mobile strategy implements the Total Quality Management (TQM) strategies upon their decisions. T-mobiles innovative and creative ideas upon their mobile handsets are purely to benefit the customers wants and needs. Functional management is found in T-mobile where specialist managers or expertise is required. Functional managers are usually concerned with a few tasks. Examples of this would be a human resource manager who is only concerned with staffing activities. Managers responsible for the all the activities in the T-mobile can be considered as line managers. They are involved in most of the organizational functions such as finance, production, human-relations, and marketing. There is a strong leadership presence in T-mobile Company. Leadership is the process of influencing and directing people towards the accomplishment of a goal or objective. Whether the job role is the supervisory or managerial position, you will need to show leadership skills. Leadership is measured by the willingness to accept direction from the employees. Leaders should be able to unlock peak performance from the workforce by using the concept of human motivation either using Positive reinforcement such as recognition, respect, praise or using Negative reinforcement such as removing privileges.

I.T. Assesment of ABC Inc Essay Example | Topics and Well Written Essays - 1000 words

I.T. Assesment of ABC Inc - Essay Example The firm that is analyzed in the paper is ABC Inc., a multinational corporation based in the United States of America and deals with the designing and selling of computer software, personal computers as well as consumer electronics. The company has produced some of the well-known types of computers that are being used allover the world. The company has more the four hundred retail stores in fifteen nations, together with an online store. The company is the largest publicly traded worldwide by market capitalization. Whereby it overtops the Exxon Mobil by about sixty billion dollars, and also the largest and most popular technology corporation in the world in terms of profit and revenue, making it worth more than Microsoft and Google put together. As of November 20, 2011, the corporation had more than sixty five thousand permanent employees working around the clock and three thousand temporary full-time workers all over the world; its total annual sales hit the sixty five billion dolla r mark, moving up to one hundred and eight billion dollars in the year 2011. The company was even in the year 2008 named by the Fortune magazine as the most admired company in the United States of America. Therefore, this means that this is the biggest company in the industry of the production of computer-related products. The assessment of the company’s general control environment should be done determining the level at which the General Accounting Office management control standards are included in the plans, strategies, procedures and guidance that govern operations and programs. In its assessment, the following have been ensured (English 87). Compliance with the law: All costs, obligations and operations adhere to the applicable regulation and law. The allocation of resources is effectively and efficiently done for the rightly authorized purposes. Reasonable safeguards and assurance: The management controls give rational assurance that the company’s assets are prot ected or safeguarded against misappropriation, loss and waste. The management controls are rationally complete, logical, efficient and effective in the accomplishment of the objectives of management. Competence, attitude and integrity: Personal integrity is encouraged among the workers and managers. All personnel are compelled to support the programs of agency ethics. There is also effective communication between and within offices. GAO Specific Management Control Standards The following specific control standards have been addressed: Delegation of Organizational responsibilities and Authority: The management has ensured that there is appropriate definition and delegation of responsibility, accountability and authority in accomplishing the company’s mission statement. The company also has an appropriate organizational structure for the purposes of effectively carrying out the program responsibilities. Supervision and Separation of Duties: The key responsibilities and duties i n authorization, recording, reviewing and processing of official agency operations are separated or delegated among different individuals. There is proper managerial supervision for the purposes of ensuring that duties and responsibilities assigned to various individuals are not abused or exceeded (Albrecht and Albrecht 63). Accountability for and Access to Resources: There are some measures in place for limiting

Initiative 200 :: essays research papers

Affirmative Action Under Attack by Initiative 200?   Ã‚  Ã‚  Ã‚  Ã‚  Affirmative action is under heavy attack by initiative 200, and it should not be. It should not be under fire because it serves as an act of restitution for the discrimination and hurt that we have caused African-Americans and other minorities throughout this century. It is our job to repair and repay blacks because our performance in the past has immediately affected their present status.   Ã‚  Ã‚  Ã‚  Ã‚  Americans, especially white males until late, were not opposed to affirmative action. This is only because affirmative action primarily benefited white males. It was the privileges our colonial fathers established on the basis of race and gender that allowed white males to dominate the job market with little or no contention. Some even believe that affirmative action is preferential treatment for white males.   Ã‚  Ã‚  Ã‚  Ã‚  White males have used race consistently in two ways since the Civil War: for the purpose of inclusion and exclusion. They have used race inclusively to benefit themselves and exclusively to deny opportunity to others. In the past, white males were preferred. In the present, however, affirmative action, though still based on race and gender, is used to include those who in the past were excluded. In more precise terms, with today’s affirmative action, or preferential treatment, we are attempting to adjust for the imbalances of the past that have been carried on into the present.   Ã‚  Ã‚  Ã‚  Ã‚  All of this seems so intuitively obvious, so why then can’t most Americans understand why affirmative action is obligatory? I believe the answer is as follows: Americans have refuse to recognize that there is and empirical relationship between the past and the present. They refuse to recognize that understanding the effects of past discrimination on the present is the key to explaining why affirmative action is not only needed in the present, but is the moral and political responsibility of so-called Christian nation. A recognition such as this would also demonstrate the inadequacies of present-day affirmative action. Affirmative action is a cheap price for blacks to settle for, given he way America has systematically discriminated against them in order to preserve and protect white male, and increasingly, white female privilege.   Ã‚  Ã‚  Ã‚  Ã‚  Since the Civil War and up to the 1954 Brown vs. the Board of Education decision, African Americans have been denied equal access to higher education and the labor market, and they have been denied by law.

Coming of Age in New Jersey by Michael Moffat Essay

Michael Moffat studied the life of college students in a co-ed dormitory living environment at Rutgers University in the late 1970’s and mid 1980’s. His book, Coming of Age in New Jersey: College and American Culture draw on writings of actual students and provide detailed accounts of the sexual histories and activities of both male and female students living in the dorm. He writes what he learned as an actual resident living with the students who understood that he was researching their habits and experiences. He lived with them and studies them as an anthropologist would. The book focuses largely on sexual life of students but also touches upon race, work ethic, gender and community living. It seems that all of these issues are related and Moffat is able to tie much of the actions and attitudes together. A common theme throughout the book is that the life of college students is not quite as wild and sex filled as society in general might assume. In fact, the experience may be less wild that the prospective students themselves expected. This was likely a relief to many of them and in fact, is likely that the family values and morals that they brought to college with them were responsible for the reality of life in the dorms. It seems that new college students do not leave all of their past experiences of knowledge at home when the come to college. They apparently have learned and formed opinions and come with a set of expectation for acceptable and unacceptable behaviors. The book also discusses the difference between expectations of general college living and the actual experience. The societal expectation or assumptions of student life, and what actually occurs is discussed. Relating the sexual activity and romantic relationship to student’s morals and prior learning is interesting. While some of the stories are disturbing, many of them lead one to believe that children actually do listen to and learn from their parents. The morals and beliefs of home follow these students to the college dorm.   Moffat notes the difference between living in a dormitory like environment such as an apartment or even boarding home, and living in a college dorm. In the college dorm there is an expected sense of community and commradery and the university does much to encourage the friendships and support that this living arrangement offers. Adolescents are transitioning from home to the life of an independent adult and the community living is meant to offer a degree of supervision and support. The effects of this arrangement on the actual experiences of students in interesting to the reader. Chapters 5 & 6 are titled â€Å"Sex† and â€Å"Sex in College† respectively. These chapters provide the details on the relationships and sexual experiences and habits of the students. Moffat found that students fell into several groups including those who were involved with more conservative and traditional monogamous, heterosexual relationships that involved love and affection. This was the largest group. Others fell in to the groups of experiments and those having some casual relationships that involved sex. This group, for the most part included those who arrived at college more experienced sexually.   Moffat grouped the students into several distinct types in terms of sexual activity. These included; neotraditional, romantic, experimental, radical, liberal and the nonheterosexual population. He was clear to note however, that every student or pair of students involved with a relationship were different, with their own set of idiosyncrasies. Most however, were interested in committed, consensual, heterosexual relationships. Orgies, no matter what the movies and pop culture may imply, were not at all the norm on the college campus. E also found that for most students, their schedule was o busy and the conflicting schedules of their partner or potential partners made sex a rarity for many. Roommates and social issues of community issue further hampered the free love environment one might have expected. The students that reported experimenting with locations such as outside or in classrooms, the library or on the bus seemed driven as much by the lack of privacy as by the desire to be an exhibitionist. The book note that the 1980’s came with the ability to easily prevent pregnancy with the availability of birth control so sex could be enjoyed more freely than in the past. Still, traditional values and the need for committed relationships held out. The fact that the college dorm was set up like a pseudo family, seems to have resulted in some degree of modesty and restraint. Moffat talks about how students would surely not walk around naked or provocatively in front of each other on the floor openly. Students or dorm mates related to each other to at least some degree, as they would act around siblings and family members in general. Those who did dare to walk to the shower wearing only a towel, for example were made fun of and the comments made were much like the comments one would make to a sibling. These relationship similarity likely resulted n some curbing of the sexual behavior at least among floor mates. Moffat’s book reports the facts and shows data and bell curves and comparisons from the 1970’s to the 1980’s. He does not draw a lot of conclusions or cause and effect relationships. That is left for the reader to do if he wishes. The book does seem to indicate that college students are more focused and serious than movies such as Animal House would have one believe. Unfortunately, this book does not address at all the realities of the effects of drugs and alcohol use on college campuses. Living with the students, Moffat did not want to report on issues of substance abuse as he was concerned about the openness of his subjects if they felt that he was potentially a â€Å"narc†. This dimension however is so important to the living experiences of college students that a glaring hole is the result. Anyone familiar with college living will notice the missing piece of information, particularly for those who lived in college dorms during the 19070’s and 1980’s when drug and alcohol use was so much less regulated than it is today The relationship between substance use and sexual activity would have been interesting to note. The issue of traumatic sexual experiences and events linked to alcohol use would likely have been linked. A study today of sexuality on campus, looking at he issue of substance abuse as well as the increased awareness of sexually transmitted diseases would be very interesting to compare to Moffat’s original study.   One would expect that the outcome would be similar to the original study in terms of understanding the relationships between values, morals, family environments and sexuality.