Calculate Energy Required to Turn Ice Into Steam

Calculate Energy Required to Turn Ice Into Steam This worked example problem demonstrates how to calculate the energy required to raise the temperature of a sample that includes changes in phase. This problem finds the energy required to turn cold ice into hot steam. Ice to Steam Energy Problem What is the heat in Joules required to convert 25 grams of -10  °C ice into 150  °C steam?Useful information:heat of fusion of water 334 J/gheat of vaporization of water 2257 J/gspecific heat of ice 2.09 J/g ·Ã‚ °Cspecific heat of water 4.18 J/g ·Ã‚ °Cspecific heat of steam 2.09 J/g ·Ã‚ °CSolution:The total energy required is the sum of the energy to heat the -10  °C ice to 0  °C ice, melting the 0  °C ice into 0  °C water, heating the water to 100  °C, converting 100  °C water to 100  °C steam and heating the steam to 150  °C. To get the final value, first calculate the individual energy values and then add them up.Step 1: Heat required to raise the temperature of ice from -10  °C to 0  °C Use the formulaq mcΔTwhereq heat energym massc specific heatΔT change in temperatureq (25 g)x(2.09 J/g ·Ã‚ °C)[(0  °C - -10  °C)]q (25 g)x(2.09 J/g ·Ã‚ °C)x(10  °C)q 522.5 JHeat required to raise the temperature of ice from -10  °C to 0  °C 522.5 JStep 2: Heat required to convert 0  °C ice to 0  °C waterUse the formula for heat:q m ·ÃŽâ€Hfwhereq heat energym massΔHf heat of fusionq (25 g)x(334 J/g)q 8350 JHeat required to convert 0  °C ice to 0  °C water 8350 JStep 3: Heat required to raise the temperature of 0  °C water to 100  °C waterq mcΔTq (25 g)x(4.18 J/g ·Ã‚ °C)[(100  °C - 0  °C)]q (25 g)x(4.18 J/g ·Ã‚ °C)x(100  °C)q 10450 JHeat required to raise the temperature of 0  °C water to 100  °C water 10450 JStep 4: Heat required to convert 100  °C water to 100  °C steamq m ·ÃŽâ€Hvwhereq heat energym massΔHv heat of vaporizationq (25 g)x(2257 J/g)q 56425 JHeat required to convert 100  °C water to 100  °C steam 56425Step 5: Heat required to convert 100  °C steam to 150  °C steamq mcΔTq (25 g)x(2.09 J/g ·Ã‚ °C)[(150  °C - 100  °C)]q (25 g)x(2.09 J/g ·Ã‚ °C)x(50  °C)q 2612.5 JHeat required to convert 100  °C steam to 150  °C steam 2612.5Step 6: Find total heat energyHeatTotal HeatStep 1 HeatStep 2 HeatStep 3 HeatStep 4 HeatStep 5HeatTotal 522.5 J 8350 J 10450 J 56425 J 2612.5 JHeatTotal 78360 JAnswer:The heat required to convert 25 grams of -10  °C ice into 150  °C steam is 78360 J or 78.36 kJ.

The History of Scissors

The History of Scissors Leonardo da  Vinci has often been credited with inventing scissors, but they predate his lifetime by many centuries. Nowadays, it’s hard to find a household these days that doesn’t have at least one pair. Ancient Scissors The ancient Egyptians used a version of scissors as long ago as 1500 B.C. They were a single piece of metal, typically bronze, fashioned into two blades that were controlled by a metal strip. The strip kept the blades apart until they were squeezed. Each blade was a scissor. Collectively, the blades were scissors, or so rumor has it. Through trade and adventure, the device eventually spread beyond Egypt to other parts of the world. The Romans adapted the Egyptians  design in 100 A.D., creating pivoted or cross-blade scissors that were more in line with what we have today. The Romans also used bronze, but they sometimes made their scissors from iron as well. Roman scissors had two blades that slid past each other. The pivot was situated between the tip and the handles to create a cutting effect between the two blades when they were applied to various properties.  Both Egyptian and Roman versions of scissors had to be sharpened regularly. Scissors Enter the 18th Century Although the actual inventor of scissors is hard to identify, Robert Hinchliffe, of Sheffield, England, should be rightfully acknowledged as the father of modern scissors. He was the first to use steel to manufacture and mass-produce them in 1761 more than 200 years after da  Vinci’s death. Pinking shears  were first invented and patented in 1893 by Louise Austin of Whatcom of Washington to facilitate pinking and scalloping and as a marked improvement over ordinary pinking irons and tools.† Here are some mentions of scissors in print publications over the years, as well as a bit of folklore. From Emar, Capital of Astata, in the 14th  Century BCE By Jean-Claude Margueron Besides ceramics, occasionally collected in large quantities, the houses produced stone and metallic objects illustrating both day-to-day needs and the activities of city merchants: beer filters,  containers, arrow and javelin heads, scales of armor, needles and  scissors,  long nails,  bronze scrapers, millstones, mortars, many kinds of grindstones, pestles, various tools and stone rings. From  The Story of Scissors  by J. Wiss Sons, 1948 Egyptian bronze shears of the Third Century B.C., a unique object of art.  Showing Greek influence although with decoration characteristic of Nile culture, the shears are illustrative of the high degree of craftsmanship which developed in the period following Alexanders conquest of Egypt.  Decorative male and female figures, which complement each other on each blade, are formed by solid pieces of metal of a different color inlaid in the bronze shears.Sir Flinders Petrie ascribes the development of cross-bladed shears to the First Century. In the Fifth Century, the scribe Isidore of Seville  describes cross-bladed shears or scissors with a center pivot as tools of the barber and tailor. Folklore and Superstition More than one expectant mother has placed a pair of scissors beneath her pillow at night somewhere toward the end of her ninth month of pregnancy. Superstition says that this will â€Å"cut the cord† with her baby and prompt labor. And heres another tall tale: Don’t hand those scissors to your best friend. Place them on any available surface and let your friend pick them up. Otherwise, you risk severing your relationship. Some say that those scissors languishing in your catch-it-all drawer can help keep evil spirits out of your home. Hang them by one handle near your door so they form a version of a cross.

Class Project Survey Research Paper Example | Topics and Well Written Essays - 500 words

Class Project Survey - Research Paper Example due to changing global climate. Sea level is also increasing and we are now exposed to the threat that a substantial portion of US Gulf Coast along with Eastern Seaboard. We are also breathing polluted air as many more countries across the world are being highly industrialized, and hence, proportion of hazardous gases including CO2 in the air has increased significantly. (McKay, 403) 1. B) How do forces outside of the US impact your job prospects? Our job prospects are not only affected by internal economic situations, but also by factors that are external to the economy of US. First, opportunities of jobs in the countries outside the US have decreased significantly due to the recent global financial crisis. And second, the extent of outsourcing has been increasing day by day on account increased availability of cheap labor from countries like India, Kenya, (McKay, 385-387) Philippines, and other developing countries. 1. C) How do forces outside of the US impact your physical safety? The physical safety of US citizens is continuously being threatened by terrorists groups of Islamic regions of the world. The event of 9/11 showcased how powerful the Islamic terrorist groups have become. Although, the US government has taken excellent security measures, but we still do not feel fully secured. (McKay, 283) 1.

Admin Law Essay Example | Topics and Well Written Essays - 2500 words

Admin Law - Essay Example tion that has taken over the function of the Spelsbury District Council has moved from the status of â€Å"state† to â€Å"person†, which are the only two groups in society that are assumed under the European Convention of Human Rights, which aims to protect the rights of â€Å"people† from the â€Å"state†. Thus, when a judicial review process is considered, the Spelsbury Council would clearly fall under the category of â€Å"state† and Tracy would be â€Å"person† whose rights have to be protected. However, since the limited liability1b aspects impart the status of personhood upon such corporations that enjoy its benefits, therefore the Directors of the new company would be absolved of responsibility for civil actions against them because the corporation itself would be considered a person, just like Tracy, thereby blurring the distinction that allows a judicial review process to proceed against a clearly defined public body. However, since the limited liability company has been set up to carry out a public function that was originally carried out by the Spelsbury District Council and for the benefit of the public, it is likely that the courts may be amenable on this aspect of the case and Tracy may be allowed to seek permission from the High Court to ask for a judicial review of the decision.2 Section 31 of the Supreme Court Act of 1981 governs the judicial review process in England, whereby the question of permission being granted by the High Court may be subject to whether the Court â€Å"†¦Ã¢â‚¬ ¦.considers that the applicant has a sufficient interest in the matter to which the application relates.†3 In the case of R v Inland Revenue Commission ex parte national Federation of Self Employed4 Lord Wilberforce set out three separate criteria on deciding whether sufficient interest exists and one of these was the relative positions of the defendant and the plaintiff and the nature of the breach that is alleged to have been committed. In this case, the decision has been

Essay --

Racism In A Worn Path And Desiree's Baby In both of the stories A Worn Path by Eudora Welty, and Desiree‘s Baby by Kate Chopin. The encounters of Phoenix and Desiree show two different readings that deal with a common theme of impending the black and white racial issue in America. There are lots of references to racism in both of the readings. Throughout the short story A Worn Path, there are many events related to racism when Phoenix walking along an extremely difficult path to the town and get the medicine for her grandson. The first event is that when she meets the white hunter. First he appears as a kind and a friendly person , he suggested Phoenix to return home , however , she refused the hunter 's suggestion , because she is on a mature and important mission of love. Then the hunter made a racist joke to Phoenix, "I know you colored people! Wouldn't miss going to town to see Santa Claus!" Second event is that when Phoenix entered clinic, she has been treated unfairly because she is black. "A charity case, I suppose," said an attendant who sat at the desk before her."(Welty70) ,"" Are you deaf?" cried the attendant."(Welty 75). The attendant rudely asked whether she is deaf because she didn't answer her questions immediately and Phoenix referred as a charity case .Phoenix performed a great sacrifice for her gran dson, but the attendant 's behavior shows she is childish. Phoenix Jackson accepted the harsh circumstances of her life and moves on. The racism feature is the main theme in the short reading " Desiree's Baby. There are racism events happens when throughout the story. Desiree's Baby took place when racism was way too prevalent. After Desiree married to Armand , they birthed a baby. When the child grows, the ski... ...t not judge the people by looking at their races, like the old says" don't judge a book by its cover. In the reading, the pride of Armand was greater than the love for his wife and their baby, which destroyed Desiree and their baby's life and led to a sad ending. In Welty 's short story "A Worn Path", Phoenix is an old black woman who has no education after Phoenix was freed from slavery, and the racism was still way too prevalent after the Civil War. Her pride of love that she wants to get the medicine for her grandson and go through the woods no matter how difficult was it and no matter how unfair the society is ,there is nothing can able to stop her way. In both stories Desiree's baby and A Worn Path showed a great representation to the readers about the struggles of racial issues in South U.S and people went through. The world has changed when time moves on.

How to Be a Good Teacher

Great English Teachers What are the characteristics of a good teacher of English? The traits range from great teaching and management strategies to a good attitude. Top Characteristics for Teachers There are 15 characteristics of effective teachers that range from having high expectations to being flexible and imaginative. These 15 characteristics can be placed into two categories: management and instructional techniques and personal traits. To have strong classroom management and instructional techniques, an English teacher needs to try a variety of techniques to find the ones that work for him or her. Instructional Techniques English teachers need to teach reading, writing, viewing, listening, and speaking. These are five distinct areas, and each has its own set of benchmarks and indicators. Simply put, English teachers have a great deal of content to juggle in the classroom. The list of indicators for their content is quite long. They need to be knowledgeable of grammar, vocabulary, writing, literary elements, great novels, researching techniques, speech strategies, etc. In addition to being a master of content, teachers need to have a large repertoire of teaching strategies. Direct instruction, collaborative learning, and the jigsaw strategy, are just a few techniques that effective teachers use in the classroom. Variety is the key. So, the English teacher must be flexible and willing to try a variety of strategies to see what works best with his or her students. Management Techniques Good English teachers must have excellent classroom management techniques. If teachers cannot manage their students successfully, very little learning will occur in the classroom. With the No Child Left Behind Act and current state policy, it is important that students make gains in their learning every year. For young teachers, classroom management is usually a struggle. New teachers need to be willing to seek out seasoned teachers to mentor them on how to handle the classroom properly and to try different classroom management strategies. Personality Traits Usually, the three most important personality traits are a flexible approach, a caring attitude, and a sense of humor. There are, of course, other personality traits that enable teachers to become great teachers. However, in the current torrent of change in education, a teacher needs to be flexible to help a student. It also helps to be able to laugh and to keep smiling in this climate of change. It is very important that students feel that their teachers care about them. They need to feel safe in a supportive learning environment because this may be the only safe place that some children have. A safe, caring learning environment will help students to work to their true potential. Last, teachers need to have a sense of humor. So many things go wrong every day. It is important to be able to laugh and to keep going. The students need a happy teacher, not an angry one. The characteristics of a good teacher of English include many traits and strategies. English teachers need to do their best in implementing techniques in the classroom to help our nation's children reach their learning potential Think back to your school days for a moment, who were your favorite teachers? Which ones did you learn more from and why? The chances are that they were ones who made your lessons â€Å"come alive†. Engage you in your lesson as opposed to the â€Å"talk and chalk† variety! Whilst having a sound academic background and knowledge of your subject is one thing, having the ability to relate to your students and convey your message in understandable, motivational terms is quite another. This means not only being able to relate to your learners but being able to adapt your material to suit their needs, and put it across in the most effective (personable? ) form, creating a positive, supportive learning environment. Teaching a Language Having been a teacher trainer for many years I have little time for the teacher who delivers the same lesson verbatim, year after year, without considering their individual students’ needs and learner types, or those whose ego is so large that they are unable to relate effectively to their students. To my mind, teaching a language requires different skills to teaching other subjects like History or Math. We don’t learn a language by talking about it; we learn a language by talking in it! Once a teacher has presented language, it is the students who should speak and use the language (as it is they who need the practice), and not the teacher talking the highest percentage of time – hence the term TTT -Teacher Taking Time. Language teachers also need to â€Å"rough tune† their language, speaking in terms that are slightly above the level of the learner, rather than over simplify (thus providing a false model) or bombard them with meta-language. Core Characteristics Carl Rogers, an American psychologist suggested there are three core teacher characteristics to help create an effective learning environment. †¢Respect: Being positive and non judgmental in regards to another person †¢Empathy: Being able to see things from another person’s point of view †¢Authenticity: Being yourself without egoistic barriers or hiding behind a job title These three qualities a far more likely to induce a more positive learning environment, where students are more inclined to take risks and take responsibility for their own learning. Communication between student and teacher becomes more open and honest and therefore a stronger bond emerges, based on mutual respect. These qualities should not be â€Å"clothes† that a teacher puts on in the classroom. They have to be genuine intentions. A good teacher is one who not only has knowledge of their subject but has the personality to convey it in engaging, motivational terms. Therefore demonstration and participation rather than explanation is often more effective. In short: An effective language teacher is one that cares more about their students’ learning than they do about their own teaching! Top 10 Tips for Teachers Teachers are often placed into an awkward and stressful situation, not really sure of their authority and sometimes not even placed with veteran teachers who are much help. These tips can aid student teachers as they begin their first teaching assignments. Please note: these are not suggestions for how to approach the students but instead for how to most effectively succeed in your new teaching environment. 1. Be On Time Punctuality is very important in the ‘real world'. If you are late, you will definitely NOT start out on the right foot with your cooperating teacher. Even worse, if you arrive after a class has begun which you are supposed to be teaching, you are placing that teacher and yourself in an awkward situation. 2. Dress Appropriately As a teacher, you are a professional and you are supposed to dress accordingly. There is nothing wrong with over dressing during your student teaching assignments. The clothes do help lend you an air of authority, especially if you look awfully young. Further, your dress lets the coordinating teacher know of your professionalism and dedication to your assignment. 3. Be Flexible Remember that the coordinating teacher has pressures placed upon them just as you have your own pressures to deal with. If you normally teach only 3 classes and the coordinating teacher asks that you take on extra classes one day because he has an important meeting to attend, look at this as your chance to get even further experience while impressing your dedication to your coordinating teacher. 4. Follow the School Rules This might seem obvious to some but it is important that you do not break school rules. For example, if it is against the rules to chew gum in class, then do not chew it yourself. If the campus is ‘smoke-free', do not light up during your lunch period. This is definitely not professional and would be a mark against you when it comes time for your coordinating teacher and school to report on your abilities and actions. 5. Plan Ahead If you know you will need copies for a lesson, do not wait until the morning of the lesson to get them completed. Many schools have procedures that MUST be followed for copying to occur. If you fail to follow these procedures you will be stuck without copies and will probably look unprofessional at the same time. 6. Befriend the Office Staff This is especially important if you believe that you will be staying in the area and possibly trying for a job at the school where you are teaching. These people's opinions of you will have an impact on whether or not you are hired. They can also make your time during student teaching much easier to handle. Don't underestimate their worth. 7. Maintain Confidentiality Remember that if you are taking notes about students or classroom experiences to turn in for grades, you should either not use their names or change them to protect their identities. You never know who you are teaching or what their relationship might be to your instructors and coordinators. 8. Don't Gossip It might be tempting to hang out in the teacher lounge and indulge in gossip about fellow teachers. However, as a student teacher this would be a very risky choice. You might say something you could regret later. You might find out information that is untrue and clouds your judgement. You might even offend someone without realizing it. Remember, these are teachers you could be working with again some day in the future. 9. Be Professional With Fellow Teachers Do not interrupt other teachers' classes without an absolutely good reason. When you are speaking with your coordinating teacher or other teachers on campus, treat them with respect. You can learn a lot from these teachers, and they will be much more likely to share with you if they feel that you are genuinely interested in them and their experiences. 10. Don't Wait to the Last Minute to Call in Sick You will probably get sick at some point during your student teaching and will need stay home for the day. You must remember that the regular teacher will have to take over the class during your absence. If you wait until the last minute to call in, this could leave them in an awkward bind making them look bad to the students. Call as soon as you believe you will not be able to make it to class.

Essay on Racial Identity and Socially Constructed Race

Michael Omi and Howard Winant’s arguments from â€Å"Racial Formations† are about how race is socially constructed and is shown in Caucasia by Danzy Senna. Michael Omi and Howard Winant believe that race is socially constructed in society; therefore, the meaning of race varies within different cultures and societies. According to Omi and Winant, influences such as, media, school, politics, history, family and economy create society’s structure of race. In Caucasia, media, family and school are forces that create race by stating how one should conform to social norms for different racial groups. In Caucasia, the theme of ‘racial etiquette’ plays a big role in the society that Birdie lives in and this proves Omi and Winant’s claim about how†¦show more content†¦Omi and Winant explains how humans make judgments because of how they think and sometimes they make judgments according to what they see on the outside and grouping accordingly rather than thinking about it first. An example from Caucasia that shows this is, â€Å"All right brotherman, who’s the little girl?... she’s my daughter. Is there a problem...The cops didn’t believe my father, not even when he showed them a photograph of me and my sister that he kept in his wallet† ( Senna 60) .This quote shows how Birdie and her father were approached by two police officers while having quality time in a park; these officers made assumptions based on Birdie’s skin tone without thinking that she may be mixed and it proves Omi and Winant’s point because the o fficers’ perception of races are based by the shaping of race in society. The theme of racial etiquette in Caucasia proves what Omi and Winant are trying to say because people judge without thinking of the possibilities that one may not be the race that is perceived from physical appearances. Omi and Winant stated that the media plays an important role in the construction of race because it portrays and stereotype different racial groups. For example, â€Å"Film and television have been notorious in disseminating images of racial minorities which establish for audiences what people from these groups look like, how they behave, and who they are ( Omi andShow MoreRelatedGender, Gender And Race, By Christine Overall And Cressida Heyes1702 Words   |  7 Pageswith that race and sex-gender are socially constructed. Thus, Overall has no problem with the concept of identity changes—for both sex-gender and race—however, Heyes argues that they are not constructed in the same way. Christine Overall is advocating the claim that transracial surgery is not problematic if transsexual surgery is acceptable. She brings possible arguments and discusses them against â€Å"rejecters of transracial surgery† (185). 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