Isolation of Caffeine from Tea (12A) Introduction When a person drinks tea or coffee‚ it is not pure caffeine. It also has other natural substances. The purpose of this lab was to isolate caffeine from tea leaves. The methylene chloride removed nearly pure caffeine from the basic tea solution. Caffeine is a white‚ crystalline‚ bitter alkaloid‚ C8H10N4O2 ‚ usually derived from coffee or tea. Caffeine is used in medicine chiefly as a nervous system stimulant. Caffeine is used by humans to ward off
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some flies became stuck in the food source and died. The main cause of this was the fact that the fly vials were stood up (vertically) before the flies had fully recovered from the anaesthetic. This could be overcome in future experiments by ensuring that the vials are kept horizontal until all of the flies fully recover from the anaesthetic. One possible error that may have occurred was that some of the adult flies may have accidentally been left in the vials with their offspring‚ which would have
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Is Isolation Ever for the Better? John Steinbeck’s Of Mice and Men contains multitudes of themes in which Steinbeck shows his disgust with society. One such theme is the theme of isolation. Steinbeck portrays isolation through several characters throughout the book. Three characters in particular stand out as isolated. crooks‚ the only black man‚ Curley’s wife‚ who is the only woman on the farm and never named‚ and Candy‚ an old man who cannot work very much. These three characters are isolated
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Isolation occasionally drives a person to insanity and causes them to do things they normally wouldn’t. When everything they know and love is stripped from a person‚ their true character is reveal. In The Penelopiad by Margaret Atwood‚ Penelope faces this exact scenario when she is left behind in Ithaca as Odysseus leaves to fight in the Trojan war‚ losing the only person she can trust. In the absence of Odysseus‚ Penelope’s complex character is revealed. Atwood effectively uses diction‚ point of
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Poe‚ the author of this story has made it to where there is a few elements that add suspense to the story. Isolation would be a key element in the story that I would say adds suspense to the story it is one of the key one’s because as he explains what’s happening in this dark room that there is no light up until the part where he is under the pendulum‚ anyway he uses suspense with the isolation by always changing what was going on along with a little repetition with him getting knocked out with a Mickey
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When one pushes people away consistently‚ it is to protect themselves. In the Catcher in the Rye‚ J.D Salinger’s protagonist‚ Holden Caulfield‚ creates reoccurring gestures of isolation throughout the novel. Holden’s behaviour clearly suggests the requirement of love and affection‚ however‚ fails to generate the opportunity to maintain a formulated conversation. During his childhood‚ Holden becomes emotionally scarred because the only person he likes‚ his brother Allie‚ dies. Which brings him to
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and isolation. I found this idea interesting because it helped me understand how important it is to be surrounded by people. George and Lennie’s friendship contrasts this idea as they are friends and they have each other‚ whereas most of the other ranch workers travel alone. The idea of loneliness was strongly conveyed through the characters Crooks and Curley’s wife‚ they are both key examples of lonely and segregated characters. The location of the ranch also represents the idea of isolation as the
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Pearl’s isolation and her reliance upon her mother has led to her not being able to form relationships between other people. In the story‚ Pearl is conceived by the unfortunate crime of adultery. She is isolated from everyone but her mother‚ Hester. Hester is the only person Pearl interacts with in a loving way throughout the story. Pearl is very protective of Hester; when the children were making fun of Hester Pear‚ “. . . snatching up stones and fling at them‚ (Hawthorne 64).” This shows how
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(A Glossary of Literary Gothic Terms) Isolation is always present throughout the entire text. The story starts off with Walton on his boat traveling to the north pole. Not only is the north pole a lonely and isolated place; Walton always mentions that he has no friends‚ feels lonely and wants
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novel‚ The Metamorphosis by Franz Kafka‚ alienation and isolation are very prominent themes that flow through the pages. When Gregor undergoes his transformation into a grotesque insect‚ it creates this psychological and emotional rift between Gregor and his family. To separate themselves‚ his family lock Gregor in his room and only his sister‚ Grete‚ is allowed in to clean and feed Gregor. Gregor is physically and literally isolated from mankind‚ as he is imprisoned and is in fact‚ no longer human
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