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History of modern chemistry
History of modern chemistry
Organic chemistry for grade 12
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Intro: Organic chemistry is the scientific study of the structure of organic compounds. This includes the properties of the compounds and what occurs during chemical reactions. The structure of these compounds is found through analysing the results of Ultra violet spectroscopy. There have been many famous chemists over time who have made some ground breaking discoveries. None more so than R.B Woodward who almost single handily revolutionised the field of organic chemistry, winning a Nobel Prize in 1965 for his work on organic synthesis.
Organic chemistry is important in many aspects of science, such as medicinal, polymer and biochemistry as well as a material science. Organic compounds have many useful real world applications and are important
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It is composed as shown in figure 1, with 6 carbon atoms joined in a ring, with 1 hydrogen atom attached to a solitary corresponding carbon atom. The ring is in a hexagonal shape. Each carbon atom in the hexagonal ring has four electrons to share. This causes each carbon atom to 4 bonds. One of these bonds goes to the hydrogen atom and one each to the two closest atoms of carbon. This leaves one free bond, which is used to form a double bond with one of the carbons atoms nearest neighbour. This is why Benzene is drawn with alternating double bonds and single bonds. X ray diffraction shows that the six carbon- carbon bonds are the same length, as predicted by Kekule, at 140 picometers. This length is an intermediate distance of the length of a single and a double bond.
Benzene in drugs: Many drugs contain a ring of benzene or a derivative of benzene, which is where one or more of the hydrogen atoms in benzene is replaced by another molecule. These drugs can be both beneficial and detrimental to the health of the user. Pain relievers are an important drug and many of the main pain relievers have these benzene
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Rats use this organ to detect the levels of pheromones in other rats’ urine. The levels vary due to the structure of their immune systems. To have the best chance of reproducing to produce a fertile offspring, rats must mate with a partner who has an immune system different from their own. This would allow the rats offspring to have the best chance of fighting off a wider range of infections. Research has also been done in Colorado where they found that this organ also exist in the majority of adults. This could mean that humans are susceptible to pheromones, like the rat, although it seems unlikely that we are as swayed by the effects of
A weak peak was at a position between 1600-1620 cm-1 can also be seem in the IR, which was likely to be aromatic C=C functional group that was from two benzene rings attached to alkynes. On the other hand, the IR spectrum of the experimental diphenylacetylene resulted in 4 peaks. The first peak was strong and broad at the position of 3359.26 cm-1, which was most likely to be OH bond. The OH bond appeared in the spectrum because of the residue left from ethanol that was used to clean the product at the end of recrystallization process. It might also be from the water that was trapped in the crystal since the solution was put in ice bath during the recrystallization process. The second peak was weak, but sharp. It was at the position of 3062.93 cm-1, which indicated that C-H (sp2) was presence in the compound. The group was likely from the C-H bonds in the benzene ring attached to the alkyne. The remaining peaks were weak and at positions of 1637.48 and 1599.15 cm-1, respectively. This showed that the compound had aromatic C=C function groups, which was from the benzene rings. Overall, by looking at the functional groups presented in the compound, one can assume that the compound consisted of diphenylacetelene and ethanol or
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+ 360 + (3 348) + 463 = 5575. Pentan-1-ol has eleven C-H bonds, 4 C-C bonds, 1 C-O bond and one O-H bond therefore the calculation would be: (11 412) + (4 348)+ 360 + 463 = 6747. Hexan-1-ol has 13 C-H bonds, 5 C-C bonds, one C-O bond and one O-H bond therefore the calculation would be: (13 412) + 360 + (5 348) + 463 = 7919. Heptan-1-ol has 15 C-H bonds, 6 C-C bonds, one C-O bond and one O-H bond therefore the calculation would be: (15 412) + 360 +(6 348) + 463 = 9091. Octan-1-ol has 17 C-H bonds, 7 C-C bonds, one C-O bond and one O-H bond therefore the calculation would be: (17 412) + 360 + (7 348) + 463 = 10263.
Psychophysiological stimulation can affect the apocrine, eccrine, and sebaceous glands altering body odor and the ways others perceive us. The apocrine glands are the source of human pheromones activated by emotions. This explains why there is a higher correlation of correct assessments between adults of the opposite sex due to pheromones not being active before puberty. Association ability originates early in human development and plays a major role in social interactions such as: the i...
Pheromones are natural scents, which play an important role in sexual communication. Animals and humans release masses of biological chemicals in tears, saliva and perspiration. These aromas convey signals relating to mood, status, drive and health to the subconscious awareness of the female. The dominant male will exude more of these biological attractants than his submissive counterpart, consequently he inevitably attracts more females and enjoys more conquests. This philosophy holds well in the animal world, pheromones are consciously detected over considerable distances and serve at times in place of spoken communication. They help animals mark territory, recognize mates, and signal sexual interest. For example, female dogs in heat leave their pheromone and can attract male dogs over a mile away (5).
The organic substance is composed of carbon and commonly in combination with hydrogen, oxygen, nitrogen, chlorine, phosphorus, or other elements (Sanferstein, 2011, Pg 123). Inorganic substances are a compound not based on carbon or it can encompass other known chemicals. In order to classify both compounds they must be classified according to what physical form it takes. Saferstein lists the three forms that fall under: solid, liquid, and gas. “A solid is rigid and therefore has a definite shape and volume. A liquid also occupies a specific volume, but its fluidity causes it to take the shape of the container in which it is residing. A gas has neither a definite shape nor volume, and it will completely fill any container into which it is place” (2011, Pg. 120). Chromatography, spectrophotometry, and mass spectrometry are used to identify or compare organic materials. As explained by Saferstein “Chromatography is a means of separating and tentatively identifying the components of a mixtur...
Hydrogen is a tasteless, odorless, colorless gas. Hydrogen is found in group 1 and period 1 on the periodic table. Hydrogen is classified as a nonmetal on the periodic table. The symbol for hydrogen is represented by an H, its atomic number is 1, and its atomic weight is 1.0079. The hydrogen atom consists of one proton, which has a positive charge, and one electron, which has a negative charge. The term hydrogen comes from two Greek words meaning water-former. Henry Cavendish, an English scientist, discovered it in 1766. Named by Lavoisier, hydrogen is the most abundant of all elements in the universe. The sun and many other stars consist of mostly hydrogen. It is the third most abundant element on earth. It is estimated that hydrogen makes up more than 90% of all the atoms or three quarters of the mass of the universe. Hydrogen plays an important part in powering the universe though both the proton-proton reaction and carbon-nitrogen cycle. Hydrogen occurs in almost all organic compounds. Many of the compounds found in plant and animal tissues are organic. Production of hydrogen in the U.S. alone now amounts to about 3 billion cubic feet per year. Some of the methods that hydrogen is prepared by are steam on heated carbon, decomposition of certain hydrocarbons with heat, action of sodium or potassium hydroxide on aluminum, or displacement from acids by certain metals. Hydrogen may be condensed to a liquid that boils at -257.87°C and freezes at -259.14°C. Hydrogen ...
There are four different types of hydrocarbons each having a different homologous series (formula for carbon chain). These being an alkane (formula = CnH2n+2), alkene (formula = CnH2n), alkyne (formula = CnH2n-2), and an alkanol which has the same formulae as an alkane only that is has a hydroxide molecule which replaces one of the hydrogen atoms (refer to figure 3 and
From these properties of bonds we will see that there are two fundamental types of bonds--covalent and ionic. Covalent bonding represents a situation of about equal sharing of the electrons between nuclei in the bond. Covalent bonds are formed between atoms of approximately equal electronegativity. Because each atom has near equal pull for the electrons in the bond, the electrons are not completely transferred from one atom to another. When the difference in electronegativity between the two atoms in a bond is large, the more electronegative atom can strip an electron off of the less electronegative one to form a negatively charged anion and a positively charged cation. The two ions are held together in an ionic bond because the oppositely charged ions attract each other as described by Coulomb's Law.
" Carbon is used in diamonds, petroleum oil, radiocarbon dating, smoke detectors, kerosine, gasoline, carbon fiber. Alcin is a member of the Council of the United States. Organic chemistry is the study of carbon and its compounds (Alcin). Carbon is less than one percent of all matter. Carbon is part of every living thing (Gangson).
Though many people fail to realize it, chemistry is a subject essential to everyday life, due to the fact that it is the branch of science that deals with the identification of the substances of which matter is composed. But what we must understand is that everything in the universe is composed of matter, hence chemistry is necessary in learning more about the world and universe that we live in. There are many careers and fields affiliated with chemistry that people pursue to learn more about the composition of the universe, but for now, let us examine the logistics of three of these careers. These three careers involving chemistry are geochemistry, environmental chemistry, and chemical engineering.
According to Birkett’s,A (2011), hydrocarbons include in the petrol which contains carbon atoms and hydrogen atoms. Both play an important role as a fuel because carbon dioxide is a combination of carbon atom and two oxygen atom and water (H20) is a combination of two hydrogen with oxygen. Gasoline or the other name for petrol has a characteristic which is transparent, petroleum-derived liquid that is used primarily as a fuel in internal combustion engines as stated in WordNet (r) 3.0 (2006). Petroleum contains of organic compounds with a many of additives obtained by the fractional distillation of petroleum. In North America, they just called petrol as gas in daily life. Some of the country such as United Kingdom, Republic of Ireland, India, and Australia and in most of the other Commonwealth countries called petrol in common name.
Throughout my school career I have always loved chemistry. In Chemistry there was always a sense that there was more, there was always something new and exciting to be discovered and theories to be proven (or even disproven). Chemistry was the main subject with a real practical aspect to it during school and it is this, along with my genuine fascination with the subject, which fuels my desire to study it further.
Sazlberg, Hugh W. From Caveman to Chemist: Circumstances and Achievements. Washington, D.C.: American Chemical Society, 1991.
Chemistry is the most fascinating science to me. Chemistry applies to all things in the universe; living or non-living. Everything is made of elements which are made up of atoms of a certain atomic number. Thereafter I took AP Chemistry, I knew I had to choose a career in the field of chemistry. I understand and enjoy learning about chemistry. Chemistry is important, interesting, and ever expanding. Therefore, I must pursue a career in Chemistry.