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Search results 171 - 180 of 1458 matching essays
- 171: Alchemy
- ... difference between them is according to the proportion of these substances in their composition. Further, all the products of minerals present in their composition complete identity with those substances most opposed to them. Thus fulminating acid contains precisely the same quantity of carbon, oxygen, and azote as cyanic acid, and "cyanhydric" acid does not differ from formate ammoniac. This new property of matter is known as "isomerism". M. Figuier's friend then proceeds to quote support of his thesis and operations and experiments of M. Dumas, ...
- 172: Evaluating An Enthalpy Change That Cannot Be Measured Directly.
- ... we had to calculate as part of the experiment. This however cannot be measured directly, but can be found using the enthalpy changes from two other reactions. These being that of sodium hydrogencarbonate and hydrochloric acid and also sodium carbonate and hydrochloric acid. We were given a list of instructions in how to carry out the experiment, which are given later. List of Apparatus Used. 1 x 500ml Beaker. 1 x Thermometer(-10 to 50oC). 1 x Polystyrene ... HCL. Diagram. Method. Three grams of sodium hydrogen carbonate was weighted out accurately using a weighting bottle and a balance. Then thirty centimetres cubed of 2 molar HCL was measured using a measuring cylinder. The acid was then placed into the polystyrene cup and its temperature was taken and recorded using the thermometer. The pre-weighted sodium hydrogencarbonate was then added to the solution, and the final temperature was recorded. ...
- 173: A Farewell To Arms Is A Classi
- ... point to consider was that Mr. Henry was a deserter. He left the army to be with Catherine. Desertion was illegal and he paid for it by loosing that which he loved the most, Catherine. Rain was connected with pain or grief. He drank to dull this grief or pain. Rain is wet and wet is connected with alcohol. We had each been drinking out of one of the bottles and I took my bottle with me and went over and lay flat on the hay ... drink his troubles away. When Hemingway said that the land was wet , it usually meant that Mr. Henry was drunk. After Catherine and the baby died at the hospital, Mr. Henry walked home in the rain. After a while I went out and left the hospital and walked back to the hotel in the rain. page 332. He had just suffered a major loss and dealt with it in the ...
- 174: Telecommunication
- ... experiments to create a functional telephone Bell pursued two separate designs for the telephone transmitter. The first used a membrane attached to a metal rod. The metal rod was submerged in a cup of mild acid. As the user spoke into the transmitter the membrane vibrated which in turn moved the rod up and down in the acid. This motion of the rod in the acid caused variations in the electrical resistance between the rod and the cup of acid. One of the greatest drawbacks to this model was that the cup of acid would have to be constantly refilled. ...
- 175: El Nino
- ... the air above it, making it too dense to rise high enough for water vapor to condense and form clouds. As a result, this strip of ocean stays free of clouds during normal years and rain in the equatorial belt is largely confined to the extreme western Pacific near Indonesia. But when the easterlies weaken and retreat eastward during early stages of an El Nino event, the upwelling slows and the ocean warms. The moist air above the ocean also warms. It becomes light enough to form deep clouds which produce heavy rain along the equador. The change in ocean temperatures causes a major rain zone over the western Pacific to shift eastward. Related adjustments in the atmosphere cause barometers to drop over the central and eastern Pacific and rise over Indonesia and Australia. This results in a further ...
- 176: Drugs: How Danagerous Is It?
- ... of one joint is four cigarettes, or ten seconds of car exhaust. No one sees the dangers of this drug, and they usually do not care about them, making it even more dangerous. LSD, or acid, is a synthetic drug that was originally found on the skin of a mushroom. This is considered a psychedelic drug. It is very cheap, usually $4 - $5 a trip. A trip usually consists of 500-600 "mics" of acid. It can be made from morning glory, wood petroleum and other chemicals. The high is very interesting. It is described as non-real. It brings reality and imagination together in a utopia of relaxation. This may sound good, but people tripping on acid do not realized what they are doing and could jump out of buildings or moving cars and think they will live. LSD is usually taken by licking a piece of paper with a drop ...
- 177: Dna
- DNA DNA, or Deoxyribonucleic Acid, is described, in Encarta Encyclopedia as a genetic material of all cellular organisms and most viruses. DNA carries the information needed to direct protein synthesis and replication. Protein synthesis is the production of the proteins ... acids, in turn, is determined by the sequence of nucleotide bases in the DNA. A sequence of three nucleotide bases, called a triplet, is the genetic code word, or codon, that specifies a particular amino acid. For instance, the triplet GAC (guanine, adenine, and cytosine) is the codon for the amino acid leucine, and the triplet CAG (cytosine, adenine, and guanine) is the codon for the amino acid valine. A protein consisting of 100 amino acids is thus encoded by a DNA segment consisting of 300 ...
- 178: Dangers and Destructions of Floods and Hurricanes
- ... 1970 a major storm in the Bay of Bengal produced heavy seas that flooded regions of East Pakistan, killing about 200,000 people.3 River flooding can happen a number of ways. The causes are rain, snowmelt, and ice jams. Soil can not absorb as much water with continuos moistening. The longer that precipitation lasts the more water flows into streams as runoff. Cloudburst floods only last for a couple hours ... large amount of rainfall. This usually only happens in mountainous areas. They are called flash floods. Floods occurring from snowmelt and ice jams do not have to be preceded by heavy rains. Moderate amounts of rain can make things even worse because the ground does not absorb it. Floods can result in the failure dams, aqueducts, weirs, landfills, paving, construction, and storm sewers. They are artificial causes. In 1993 when rainfall ... Dakota, Nebraska, and Kansas, it covered about 16 billion acres.4 Many deaths and $10 billion in damage was the result flood level records.5 In March of 1936 snowmelt equaling 10-30 in. of rain occurred in New England.6107 people died and $270 million in damage was done.7 In 1972 at Logan County, West Va. a dam collapsed following three days of rain. In less than four ...
- 179: Earth 2 Puzzle
- ... pleasure, and maybe he wanted to think that he was like Henry who was a nicer person. In the book, Twentieth Century Interpretations of A Farewell to Arms, Malcolm Cowley focuses on the symbolism of rain. He sees rain, a frequent occurrence in the book, as symbolizing disaster. He points out that, at the beginning of A Farewell to Arms, Henry talks about how "things went very badly" and how this is connected to "At the start of the winter came permanent rain". Later on in the book we see Miss Barkley afraid of rain. She says, "Sometimes I see me dead in it", referring to the rain. It is raining the entire time Miss Barkley is ...
- 180: Organic Compounds
- ... and used in plastics, solvents, and making other chemicals. (pg.596, Smoot, Merill Chemistry) Acids and Esters Carboxylic acids are important in nature. All amino acids, the basic building blocks of protein, are carboxylic. Ethanedioic acid is the simplest dicarboxylic acid. It is formed by oxidation of carbohydrates. Esters are organic compounds that result from a condensation reaction between an acid and an alcohol. An ester is named after the alcohol and acid from which it is derived. Ex: ethanoic acid gives ethanoate. Animal fats, which are esters of carboxylic acids with the alcohol glycerol, ...
Search results 171 - 180 of 1458 matching essays
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