Investigation to find out if changes in concentration of acid affect the rate of a chemical reaction :: GCSE Chemistry Coursework Investigation

Investigation to find out if changes in concentration of acid affect the rate of a chemical reaction PLANNING – Title – Investigation to find out if changes in concentration of acid affect the rate of a chemical reaction. Introduction – The rate of reaction can be defined as the speed at which a reaction takes place. The rate of reaction tells us how quickly a chemical reaction has happened. There are many things that can affect the rate of reaction, (some of these are shown in figure 1 below.) In this coursework I am going to investigate what effect the change in acid concentration has on a chemical reaction. I will do this through a series of experiments, where I will change the concentration of hydrochloric acid by mixing it with water. I will measure the reaction by recording the amount of gas given off in 60 seconds for each experiment. I plan to keep the total amount of liquid used in the experiments at a constant 20ml. This way I can measure the concentration of the acid I use each time. Aim – To find out if the rate of reaction is effected by the concentration of an acid. Variables – I have decided to focus on the effect concentration of acid has on the rate of reaction. To get accurate results, I have to make sure all my experiments are run fairly. To achieve this I will keep all my variables constant, except the one I’m investigating, the concentration of the acid. The temperature, equipment and amount of substances I use will be kept the same for all my experiments. I will also make sure the substances I use are all prepared in the same way before each experiment. This will avoid change in surface area. (E.g. I wont crush a substance one time and keep It whole the next) In all my experiments I will keep the magnesium whole. To control the temperature of the acid, I will use a thermometer to monitor it and make sure the temperature is the same for each experiment I do. (this will most likely be at room temp. around 27degrees.) All my equipment will be kept identical to any other one of my experiments, and I will use the same size measuring cylinder (20ml) to measure out the acid and water. The concentration of the acid is the only variable I will change throughout my investigation. I will do this by weakening the solution with water, starting with a very acidic solution and gradually diluting it. This will be done by measuring the water and acid in the Investigation to find out if changes in concentration of acid affect the rate of a chemical reaction :: GCSE Chemistry Coursework Investigation Investigation to find out if changes in concentration of acid affect the rate of a chemical reaction PLANNING – Title – Investigation to find out if changes in concentration of acid affect the rate of a chemical reaction. Introduction – The rate of reaction can be defined as the speed at which a reaction takes place. The rate of reaction tells us how quickly a chemical reaction has happened. There are many things that can affect the rate of reaction, (some of these are shown in figure 1 below.) In this coursework I am going to investigate what effect the change in acid concentration has on a chemical reaction. I will do this through a series of experiments, where I will change the concentration of hydrochloric acid by mixing it with water. I will measure the reaction by recording the amount of gas given off in 60 seconds for each experiment. I plan to keep the total amount of liquid used in the experiments at a constant 20ml. This way I can measure the concentration of the acid I use each time. Aim – To find out if the rate of reaction is effected by the concentration of an acid. Variables – I have decided to focus on the effect concentration of acid has on the rate of reaction. To get accurate results, I have to make sure all my experiments are run fairly. To achieve this I will keep all my variables constant, except the one I’m investigating, the concentration of the acid. The temperature, equipment and amount of substances I use will be kept the same for all my experiments. I will also make sure the substances I use are all prepared in the same way before each experiment. This will avoid change in surface area. (E.g. I wont crush a substance one time and keep It whole the next) In all my experiments I will keep the magnesium whole. To control the temperature of the acid, I will use a thermometer to monitor it and make sure the temperature is the same for each experiment I do. (this will most likely be at room temp. around 27degrees.) All my equipment will be kept identical to any other one of my experiments, and I will use the same size measuring cylinder (20ml) to measure out the acid and water. The concentration of the acid is the only variable I will change throughout my investigation. I will do this by weakening the solution with water, starting with a very acidic solution and gradually diluting it. This will be done by measuring the water and acid in the

Frida Kahlo HSC

Friday Kohl â€Å"Art can be an expression of personal experience† Discuss this statement in reference to the life of Friday Kohl. Friday Kohl was described as â€Å"the first woman in the history of art to address with absolute and uncompromising honesty, general and specific themes which exclusively affect women† by life-long lover, Diego Riviera. As a Mexican female artist in the 20th century, Friday's themes expressed in her artworks were considered highly explicit at the time.She was fine artist who used autobiographical through her extensive output f self-portraits. They are evidence of her need for self-expression and her exploration of identity. She overcame many difficult events including polio, long recovery from a serious car accident, two failed marriages, and several miscarriages some having a direct influence on her art. She used these experiences, combined with Mexican and Native American cultural and stylistic influences, to create highly personal painti ngs.Kohl used personal symbolism mixed with Surrealism to express her suffering and anguish through her work. A viewer might classify her paintings as Surrealism, but she considered her art to be realistic. In reference to the statement â€Å"art can be an expression of personal experience†, Kohl has produced a plethora of artworks which express her personal experience. Kohl's many works from 1926 until her death in 1954 were each a response to an event, personal experience or the result of her own personal exploration into her heritage or identity.On September 17th, 1925 one single event changed Kohl's entire future. She was injured in a collision of a tram and a bus in which she suffered serious injuries in the accident, including a broken spinal column, a broken collarbone, broken ribs, a broken pelvis, eleven fractures in her right leg, a crushed and dislocated right foot, and a dislocated shoulder. An iron handrail pierced her abdomen and her uterus, which seriously dama ged her reproductive ability. After this she was bedridden for months and as she states â€Å"Without giving it any particular thought, I started painting†.This accident also provide many direct influence to her artworks including a small drawing â€Å"Accident† (1925), which portrays a scene with no consideration to the rules of respective and the images of the collision, her broken body lying on the road and her own face looking down upon her can be seen. Also in her later work â€Å"The Broken Column† (1944), this painting is a direct response to her body health slowly deteriorating to the point where she had to wear a metal corset. In the painting Friday is the centre image, with an Ionic column broken in several places as a symbol of her spine.All over her body sharp nails are embedded in her skin which expresses the immense pain which is also highlighted by the desolate, fissured landscape which ads a feel of loneliness. Friday is well known for her unique ness, this developed early in her life with the help of her loving father, Wilhelm Kohl (1872-1941), he provided her with a passion for art as he was a photographer she describes him as an â€Å"immense example to me of tenderness, of work and above all of understanding†.Her affection towards her father is expressed in the painting â€Å"Portrait of my Father† (1951), where she clearly expresses with the bannered across the bottom of the painting his accomplishments ND by positioning him with the tool of his trade a plate-back camera, her respect for him. As a young child Friday suffered from polio, which stunted the growth of her right foot, during her convalescence she spent a lot of time with her father learning how to use a camera and color photographs – experiences which were useful for her later painting.Friday Kohl's self-portraits carried highly personal messages and helped her to shaped her idea of her own self; by creating herself anew in her art, she could find her way to her identity. Such is expressed in â€Å"The Two Friday's† (1939) is a double elf-portrait, which is a complex image, filled with symbolism. This revealing, if enigmatic, work is a direct response to Kohl's divorce from her life-long lover Diego Riviera, and expresses her personal feeling towards the situation. The duality Kohl feels is revealed by contrasting costumes, Mexican and European.The painting is filled with the pain she felt at the separation from Riviera. Kohl has painted two versions of herself – one Friday, wears a Victorian dress, is the one Riviera loved and the other, on the right, dressed in simple Athena dress, is the Friday he no longer eves. The two Friday's hold hands and are also connected by an artery that flows between their two hearts. The Friday on the left-hand side controls the blood flow with surgical clamps and the open artery on her lap may refer to the end of her marriage with Riviera.The Friday on the right-hand s ide holds a small portrait of Riviera as a child. Friday on the right can also symbolism Catholic representations of the Sacred Heart of Jesus and the Friday on the left has her chest ripped open which could be in reference to the Aztec sacrificial practices. A turbulent sky fills the background, and focus is on inner identity and the desiring body. The doubling or split self and the contradictory pairing of an inner and outer reality being played out in the body suggest a surreal vision.Her many self-portraits show an indication of how her style developed over her career, when comparing her earliest self-portrait â€Å"Self-portrait in a velvet dress† (1926) to her later â€Å"Self-portrait time flies† (1929) there is a clear indication of development in style and attention to symbolism. Details like her simple looting, colonial earring, pre-colonial necklace, indicating pre-Columbian and colonial cultural influences, are an obvious progression from her earlier work.A nother example is in the two portraits â€Å"Portrait of Alicia Gallant† (1927) and â€Å"Portrait of my sister Christina† (1928), in these early portraits her style still orientated towards European-influenced Mexican portrait painting of the 19th-century, differ from the later portraits, which reveal a clear trend towards Mexicans, Mexican national consciousness. Her many personal influences are also expressed within many of her arks, she had a love of Chinese poetry which is represented in the subject for the painting â€Å"Portrait of Miguel N.Lira† (1927), her interest in Aztec rituals is represented in the composition of the painting â€Å"My birth† (1932) where the position of the woman giving birth is a direct reference to the goddess Tolerated and her passion for nature and life is represented as a motif in several paintings, including â€Å"portrait of Luther Burbank† (1931) a famed horticulturalist for his unusual passion for vegetable a nd fruit hybrid. In this paint he is depicted as half tree, half human.Her work for he first time turning away from straightforward reality into external reality. Skeleton at bottom relates to her favorite subject – birth of life through death which reflects on her personal experience in the car crash she suffered. The Mexican Revolution which began in 1910 had an effective influence upon the young Friday (only 3 at the time), who would later claim to be born in 1910 as to state she and the new Mexico were born at the same time.Though there are no artworks dedicated solely to the revolution and its effect upon her, it is clear in some of her works the effect the evolution and its figures had upon her like â€Å"Nucleus of Creation† (1945) and â€Å"Self- Portrait dedicated to Leon Trotsky' (1937), the prominent figure and Kohl shared a brief affair and she presented to him on his birthday November 7th, the anniversary of the Russian Revolution.Her idea of creation in relation to sexuality and birth is a recurring theme in many of her later paintings including â€Å"Flower of Life† (1943), depicting a pollinating flower as a powerful representation of sexuality, also in â€Å"Sun and Life† (1947), where the amorphous plant forms are symbols of female and male initial alongside the life-giving sun in the centre and especially in the painting â€Å"Nucleus of Creation† (1945), this painting was directly inspired by the book â€Å"Moses the Man and Monotheistic Religion† by Sigmund Freud, the central figure is the abandoned baby Moses which resembles Diego Riviera surrounded by a fetus, a large sun, an egg being fertilized by sperm and also many influential figures of time including Stalin, Ghanaian and Jesus. Friday was influenced by her inability to have a child and this is a topic she explores through many of her works, in 1932 while in Detroit, United States Kohl suffered a miscarriage which is represented in the pain ting â€Å"Henry Ford Hospital† (1932), where the artist is shown as a small, naked, vulnerable figure in an enormous bed in the front of a vast plain with an industrious, cityscape on the horizon. The bed is stained with blood and flowing from her hand are images of a fetus, flower and other images linked to her miscarriage.Her miscarriage is also depicted in â€Å"My Birth† (1932), where Friday illustrates her own birth where she appears lifeless. Friday's work as a female artist in the 20th century has ad a profound impact on successive female artists. She suffered an early death at the age of 47, and like many artists since her death her work has achieved more popularity than during her life. In the sass Friday Kohl achieved a cult figure status; she is well-known for her adjoining eyebrows and explicitly, yet heavily personal work. Therefore in reference to the statement â€Å"art can be an expression of personal experience†, Friday Kohl's work would suppor t this as many events in her life led to the creation of many artworks. (1620 words)

Classical Civilizations of Ancient Greece, Rome, and China...

Throughout history, there have been many civilizations, empires, colonies, and tribes that have impacted the world. The civilizations of Greece, Rome, and China have done this, but what sets them apart from the others is their lasting significance and lasting impact they had on the world. For this reason, they are considered classical civilizations. To describe how Greece, Rome, and Han China are classical, there are three systems that are used; these are Economic, Social, and Political. Out of these three classical civilizations, Greece came first in history. An important invention of Greece was its plumbing systems. Greece was the first to create plumbing and now it is almost unheard of for a house anywhere on earth to not have a†¦show more content†¦Next on the timeline is Rome. Ancient Rome, like America, borrowed many ideas from the Greeks to create and advance structural ideas. In this way, they adapted their plumbing systems, but improved it by inventing public latrin es. We might think of this as an advancement, but Rome had areas where pots were placed in a circle to go to the bathroom, and the waste would drop down into a river or stream (the plumbing system). This was a huge improvement in their sanitary conditions. The Romans acquired other ideas from places other than Greece. In the political division, there was the Roman law where its standards were extremely influenced by the teachings of Stoic philosophers. The principles were based on common sense and practical ideas. Much of modern laws, including the legal systems of many European countries along with the United States, have been influenced by the long lasting Roman law. Again with importance, Rome’s agriculture and trade played a big role in Roman life. Agriculture was the most important industry in the empire and everything else depended on it. Most Romans relied on the food grown in their local area and all other food and luxuries were only for the rich and they got them th rough trade. Rome, being along the Mediterranean Sea, had a enormous trading system and also had roads connecting it to far off places such as Persia and southern Russia. And connecting this huge empire was its sole language, the Latin language. Latin, in theShow MoreRelated Contributions of Ancient Civilizations Essay820 Words   |  4 Pagesformed civilizations. A civilization is a community characterized by elements such as a system of writing, a development of social classes, and cities. Early civilizations such as ancient Greece, classical Rome, Mesopotamia, and classical China have made many contributions to society that still affect people in the modern world. The inventions, progress, and contributions of the people of these ancient civilizations and others have shaped the world that we all live in today. 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