How does the concentration of sucrose affect the weight Essay -- GCSE

How does the concent dimensionn of sucrose bushel the compacttof pieces of spud after osmosis has micturaten place?AimThe aim of this is experiment is to ask how much sucrose is ina potato. We are going to analyze the effect of differentconcentrations of sucrose on the weights of pieces of potato afterosmosis has taken place.PredictionI predict that the less concentrated the solution of sucrose is, thegreater the weight of the potato impart be. I predict this beca handlingosmosis is the driveway of pissing from a region of superior irrigateconcentration to a region of suffering pee concentration finished asemi-permeable membrane i.e. the carrell wall of the potato. If theconcentration of water inside the potato is richly then(prenominal) the water will diminish out through the cell wall, decreasing the weight of the potato.If the concentration of water outside of the potato is proud then thewater from outside of the potato will pass through the cell wall intot he potato, thus increasing the weight of the potato. A lowconcentration of sucrose will have a greater ratio of water to sucrose, so more water will pass pure(a) into the potato in anattempt to even up the amounts of water and sucrose on both sides. Ifthe concentration of sucrose outside of the potato is high then therewill be less water to pass through into the potato and the potato willtherefore lose water from inside in an attempt to even up theconcentrations of sucrose and water on both sides. If the cell haslost water then it will not weigh as much as a cell full of water asthe cell will be flaccid. If the cell has gained water then it will beturgid and will weigh more. The higher the concentration of the sugarsolution, the faster osmosis will take place. I think this because themore sugar in the water, the coherenter it will take for it to balanceout.Some background informationOsmosis is the movement of water from an state of high concentration(lots of water particles) to a n area of low concentration (few waterparticles). It is and the movement of water, as only water particlesare fine enough to pass through the semi-permeable cell membrane ofthe plant. Osmosis makes plants cells swell up if they are surroundedby a weak solution i.e. a lot of water, and they therefore becometurgid. This is useful in giving upkeep for cells and openingstomatal guard cel... ...in that will affect the interest measurement. Ourresults were as well left by a window, so the temperature could have beenaffected if the window was open or the weather outside was hot. Toimprove this experiment next time we force out also make sure that we leavethe screen out tubes in the test tube racks nowhere near anything that willaffect the temperature i.e. a heater or a window.The conclusion may only be valid only within a certain range, if wewere to use even more precise concentrations of sucrose solution thenwe can eventually find out the precise concentration that provides thec orrect retort. The concentrations utilize were slightly too vague as Ihad to say that the answer must lie between two amounts. However, ifwe were to improve the experiment by narrowing down the concentrationswe will use even more then this will be time-consuming and verytedious. Therefore, it will not be a good idea to try and improve theexperiment in this way.To extend this investigation we can also experiment changing thefollowing variables Temperature of the experiment Surface area of the pieces of potato Weight of the potato How long the experiment is left for.

Making Uniforms Mandatory for High Schools Essay -- School Uniforms Dr

make Uniforms Mandatory for High Schools School uniforms in high schools argon sightly increasingly popular across Canada. In fact, most school boards are positive towards making uniforms mandatory. Uniforms at high schools should be mandatory. Can uniforms in reality make a difference in a students academic performance? Of course, they can.First of all, uniforms create an atmosphere of equality at school. When worn by all students, uniforms reduce the gap between the enough and the poor and therefore, promote equality. Moreover, in the absence of uniforms, the wealthier students tend to look put through and shun the poorer students as it gives them a chance to flaunt their wealth. For instance, other students treat at a student who does not keep up with the current fashion, because he/she cannot afford it. However, introduction of uniforms gets rid of this problem because all the students fail the same change state to school and no one has a rationalness to mock at the poo rer students. Consequently, equality and freedom are established in the schools. Reduction in economic differences, as a result of have on uniforms, creates an environment of equality at high schools.In addition to promoting equality, uniforms too decrease the violence levels at high schools and improve discipline. School uniforms wanton a major role in reducing potentially suicidal altercations among students. Many unsuspecting and vulnerable students unknowingly wear gang-coloured or gang-affiliated clothes to school. Ma...

terror :: essays research papers

1.There atomic number 18 many descriptions of terrorist act. Some of them are Brain Jenkins utter that act of terrorist act is the manipulation or threatened use of force designed to bring about political change. While Walter Lacqueur said that terrorism constitutes the illegitimate use of force to fulfil apolitical object lens by sterning innocent people. Yet another definition comes from Edward Herman, who said that terrorism should be defined by end points of state repression, such as the corrupt Latin American giving medications. Still another view of terrorism comes from Alex Schmidt, who said that in that respect is no true or correct definition, because terrorism is an abstract concept with no real presence. A single definition cannot possibly account for all potential uses of the term. The final definition that is cover here is the official definition of terrorism issued by the Federal dresser of Investigation. They state that it is the unlawful use of force to intimidate a government to further political or social goals. Though these are wholly a few of the definitions of terrorism, they provide a good cross-section of the term terrorism.2.Martha Crenshaw said that terrorism means socially and politically unacceptable violence aimed at an innocent target to achieve a psychological effect. She likewise sited three criteria to make it a terrorist attack. The first is that there must be military methods used. Second there must be a millitary target involved, and finally there must be some chance of victory. 3.J. Bowyer chime stated that there are six fibres of terrorism, and each part has a purpose. The six are psychotic which attempts to achieve psychological gratification. The second is condemnable witch attempts to profit the terrorist. Next there is the vigilantly type of terrorism witch attempts to achieve retaliation for some act, fourth there is endemic terrorism witch is an internal struggle of some type. The fifth type of ter rorism is authorized terrorism, which deals with state repression of a group. Finally we have new terrorism, which changes a behavior through fear. 4.One of the many types of terrorism, according to Bell, is extremist terrorism. Here are some of the forms of revolutionary terrorism. One form is organisational which is meant to maintain discipline in a terrorist group. The next is allegiance which attempts to achieve public support for a given terror group. Thirdly there is functional revolutionary terrorism, which attempts to accomplish the missions of the terror groups. Another form is the proactive type, which incites governments to repression of a group of people.

The Signalman by Charles Dickens and The Darkness Out There by Penelope

The Signalman by Charles daimon and The wickedness reveal There by Penelope LivelyComparing The Signalman by Charles Dickens and The repulsiveness OutThere by Penelope Lively is an beau ideal way of looking at two authorsfrom contrasting times and backgrounds. Dickens, physical composition in thenineteenth century, would have had a very different hearing to writefor from Lively, writing in the twentieth century. Therefore, eachauthor uses different techniques to create tenseness in the two pieces.During the nineteenth century in that location was a strong belief in ghosts andthe spiritual world revealing ghost stories around the fireplace isoften seen as a regular form of Victorian entertainment. Dickens drawson this tradition to create a short story that would have stronglyappealed to readers of that time. Lively, however, is not writing foran listening that would enjoy a ghost story as much, therefore TheDarkness Out There, is not blatently a ghost story. To capture he rreaders interests she instead uses the warfarefare and the attitudes to theGermans as a focus of concern. As Dickens lived in a time when theQueen was married to a man of German origin, war with Germany was veryunlikely. This meant he had to use an alternate progression to draw the audience into the story. For this he used the recent invention of thesteam train to pull a foothold into the readers minds. This wasalready causing a lot of misgiving so it would have been easy to takeadvantage of the reader. He uses this approach to create tension.Another way the writers create tension is by exploring elements of theunknown. They some(prenominal) do this but in contrasting ways. In TheSignalman, the unknown is explicitly explored and it is obviously aghost story from ... ...s and Lively create tension through their useof plot, denotations, style and setting. The eerie Packers Endmatches the claustrophobia enhancing setting of The Signalman.Dickens nameless characters of the narra tor and the signalman keepthe readers on edge in The Signalman, whereas Sandras naivety,Kerrys suspicious temper and Mrs Rutters seeming innocence then theabrupt exposure of true character build up tension and surprise inThe Darkness Out There. Dickens compacted plot works well to holdthe readers attention and the build up to Livelys final climax keepsher audience hooked to the end. On the whole both authors use eventsof their time well to create suspense. I feel that although Dickensappears to do this more effectively, the seeming normality yet thesense of self-consciousness about The Darkness Out There creates just as muchtension.

The Samurais, The Ultimate Stoics :: essays research papers

The Samurais, The Ultimate StoicsFor seven centuries, the Samurai were Japans warrior class. As a classof warriors and knights, they reign society in feudal Japan. Their code or Way of the warrior, bushido(History of the Samurai-www),called for a life ofduty, discipline and self control, on and as well as off the battlefield(History of the World-Houghton Mifflin Comp any(prenominal)- Boston288). His loyalty andbravery to his lord was much to a greater extent important than his loyalty to his friends,family and even their emperor. Their philosophy was one of freedom fromfear(World Surfari-www), and for these reasons, The Samurai were the finalstoic warriors.The word samurai was derived from the Japanese word for service,saburau(Grolier Electronic Publishing, 1993), for they served their mastersfaithfully. They would peter out if necessary for them. The Daimyo or feudallandowners used the samurai to protect their land and to hit the roof their rights tomore land. The Samurai would transcend their fear of conclusion, this made them thestoic warriors that they were.As experts in fighting on horseback as well as on the ground they woretwo swords. This was called Daisho(World Surfari-www). The long sword wascalled the daito-katena(Ibid.). It was more than twenty quaternion inches long. Theshorter sword was called shoto wakizashi. It was between twelve to twenty fourinches(Ibid.). Their swords were the souls of the worship. A faithful sword wastougher and sharper. The swords were tested before they were used by thesamurai. The sword quizzer used the new blades to cut through corpses andbodies of condemned criminals.(World Surfari-www) The test results were put onthe nakago, the small metal piece on the sword blade or handle(Ibid.). Anotherweapon, the nagita, was used by a foot soldier on a horseman. The foot soldierwould cut. the tendons of the horse and disembowel them.The samurai went from host retainers, to military aristocrats, tomilitary rulers(Japan, R ichard Storry18) The medieval samurai were oftenilliterate, rural, landowners who farmed in-between battles. They wereassassins of the night and at the alike(p) time keepers of peace. The samurai wouldspend his life perfecting his military skills.Honor was one of the more or less important things to a samurai. If a samuraifelt dishonored in any way he would commit seppuku. Seppuku means ritualsuicide (Japan, Cultures of the World- Rex Shelley104). It is also calledhara-kiri which means belly-slitting. This method of self-disembowelment wasthe only honorable form of death for a disgraced noble or a samurai.

Vaccinations: A Clear Benefit Essay -- essays research papers

A clear definition of a vaccination is, the generic terminal figure for immunization procedures. Immunization is a procedure whereby living or nonconscious materials be introduced into the body (Nosal, 1999) The concept that people who survive an infectious indisposition do not get the same disease again is the al-Qaeda for the administering of vaccinations. Vaccines are normally given to healthy individuals for the prevention of diseases. Vaccines work by using a human host to provide a arousal to the insubordinate system. Immunization is used for viral and bacterial diseases. Rappuolli reports and predicts, Vaccines volition not only be used to prevent infections, but also to recuperate chronic infectious diseases, tumors, diseases and allergies. (1999) Even though there are risks touch with being vaccinated, there is no doubt that vaccines have been the most stiff means of combating deadly infectious diseases throughout the twentieth century.Vaccinations were developed or discovered in 1796 when Edward Jenner, a doctor in England, noted that the farmers septic with materials from cows did not develop small pox, but instead were immune to the disease. Today, vaccinations are available for a variety of life threatening or life altering diseases such as smallpox, rabies, salmonella, tuberculosis, diphtheria, yellow fever, tetanus, pertussis, polio, influenza, cholera, measles, mumps, rubella, meningococcus, tick-borne encephalitis, pneumococcus, hepatitis B, hepatitis A, varicella, lyme disease, and rotavirus. Vaccines are more(prenominal) commonly given to infants today to immunize early. Already there are more vaccines in development for infectious diseases such as cancer, hepatitis C, papillomavirus, and helicobacter pylori. With these vaccines, tumors will be dramatically decreased. So instead of regarding vaccinations as a unutterable childhood experience, they should be perceived as tools used in the prevention and cure of diseases.Therefor e, the hazards of vaccinations have to be weighed against the benefits of immunization. Immunization has lowered the reported cases of diphtheria, pertussis, tetanus, (DPT), measles, mumps, rubella, (MMR), tuberculosis, and meningitis. A notable decrease in the number of cases of measles, hepatitis B, and polio were noticed aft(prenominal) vaccinations started being administered. The hepatitis B vaccine was introduced in 1989. Before the vaccine was availabl... ...2, 2005, from info Track database.Makela, J., Nuorti, P., Peltola, H. (2002). Neurologic disorders after measles-mumps-rubellaVaccination. 110 (5), 957-972. Retrieved March 12, 2005 from entropy Trac database.Nossal, Gustav (July 1999) Vaccination. In Nature Encyclopedia of Life Sciences. London Nature publication Group. http//network/els.net doi10.1038/npg.els.0000489Rappuoli, Rino (August 1999) Vaccinations of Humans. In Nature Encyclopedia of LifeSciences. London Nature Publishing Group. httpwww.els.net doi10.1038/n pg.els.0000961Richards, S. (2004). An update on childhood vaccinations. Primary Health Care, 14(10), 22-25. Retrieved March 12, 2005, from selective information Traci database.US nurses oppose smallpox vaccinations (2003). Australian Nursing diary, 10(8), 13.Retrieved March 12, 2005, from Info Trac database.Zepf, B. (2005) Do childhood vaccinations cause type 1 diabetes? American Family Physician,71 (3), 583. Retrieved March 12, 2005 from Info Trac database.Zimmerman, R. (2000). Child vaccination, part 1routine vaccinations. Journal of Family Practice, 49,(9), 22-33. Retrieved March 12, 2005, from EBSCOhost database.

Heart Of Darkness :: essays research papers

Heart of Darkness ?gHeart of Darkness?h, written by Joseph Conrad, holds thematically a wide range of references to problems of politics, morality and social order. It was written in a period when European exploitation of Africa was at a wan height. Conrad uses double oblique narration. A flame narrator reports the story as told by Marlow, assigned to the command of a river steamboat scheduled to transport an exploring expedition. Kurtz is a first-agent at an important trading post of ivory, located in the internal of the Congo. Both Marlow and Kertz found the reality through their work in Africa. Marlow matte up great indignation with people in the sepulchral city later his journey to the Congo region because he discovered, through his work, the reality of the universe, much(prenominal) as the great virtue of efficiency, the darkness in society and individuals and the come up reality. When Kurtz found himself on his deathbed and he said ?gThe horror, The horror referring to h is life in inner Africa, which caused him disintegration. Marlow emphasized the virtue of ?gefficiency?h throughout the story because he thought of it as the only way to survive in the wilderness. later seeing the dying natives in the forest of the outer station, Marlow described them as ?ginefficient.?h Under ?gthe devotion to efficiency,?h incompetent people were excluded from society. only when efficient people can survive. For example, since Kurtz was the most efficient agent, with regards to producing ivory, his employers respected his acquisition and regarded him as an essential person. However, once he fell into disintegration, he was considered no more the than dying natives and thus was treated as if he were dead. He was then buried in the darkness. The symbol of inefficiency was the color green. Marlow illustrated a draw of dying natives, when he said, ?gThey were black shadows of disease and starvation lying confusedly in the greenish gloom?h(20). Another example of i nefficiency is shown in the translation of the body of Marlow?fs predecessor as ?gThe grass growing through his ribs was large enough to hide his bones?h(13). Marlow realized the real darkness did not existed in Africa but in Europe, and not in Africans but in Europeans who engaged in colonial exploitation, including Kurtz. Due to the natives?f physical features and springer like cannibalism, Marlow defined Africans as the darkness. On the other hand, he considered Europeans as the light because of his illusions of civilization.