2013 Title: Observations of Chemical Changes Purpose: To observe some properties of chemical reactions and to associate chemical properties with household products. Procedure: In this experiment I used a 96-well plate to hold each of the chemical reactions that occurred during this lab. Using a pipet‚ I added two drops of one chemical with two drops of another chemical and observed the effects of each reaction. Data Table 1: Experimental Data Well # | Chemicals | Observations | |
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Knight (2015) said "When hides are soaked in a solution of chromium‚ this helps to cross-link their strands of collagen proteins into a mesh‚ making the leather more elastic and water-resistant". Chromium is a very rigid metal with a very firm chemical composition and is widely used in stainless steel (alloy steel) manufacture. When Chromium is supplemented to steel‚ it becomes harder‚ shinier‚ and corrosion resistance. Chromium is one of the hardest metals with an incredibly high melting point
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is made of atoms. He based his theory on two laws: the law of conservation of mass and the law of constant composition. The law of conservation of mass says that matter is not created or destroyed in a closed system. If a chemical reaction is preformed‚ the amount of each element we had has to be the same before and after the reaction. In other words‚ if we combine
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cards for each of the known elements. On each card‚ he recorded an element’s atomic weight‚ valence electron‚ and other chemical and physical properties. Then he tried arranging the cards in various ways to see if any pattern could be created. Eventually he was successful. He saw that‚ when the elements were arranged in ascending order according to their weights‚ their properties were shown in an orderly manner. He also found three places in the periodic table where elements were missing. Mendeleev
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Purpose The purpose of this lab was to observe chemical changes which result in different properties. Procedure First all materials needed for experiment were gathered. Using a sanitized scissor‚ all the pipets were cut open at the very top of the pipet. The 96 well plate was used for combining the chemicals to see what the reactions were and the 12 well plate was used for holding the pipets filled with chemicals that had been opened. In column 1 row A of the 96 well plate; two drops of NaHCO3 was
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need to be reduced to produce the metals as elements. Metals are very useful to us because of their special properties. Reduction means removal of oxygen or gain of electrons. Carbon is a good chemical reducing agent because it readily combines with oxygen‚ but it is only useful for the metals below it in the Reactivity Series. In the process of electrolysis‚ the positive metal ions in the compound gain electrons to become atoms of the elements. METAL METHOD OF EXTRACTION Potassium
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all over the world discovering unusual patterns on the rocks and mountains of certain places. Within the discoveries found all around the world scientists have found a few rare chemical elements in the process of the search. Some of the chemical elements included were the iridium‚ cosmic space dust‚ the isotope plutonium 244 and sulfur as well. Currently‚ the main suspect behind this
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under normal conditions are all examples of physical properties. b. chemical property – A chemical property of a substance describes its chemical reactions with other substances. The chemical property of sodium states that sodium will react with water to form hydrogen gas. c. physical change – A physical change include changing shape‚ volume‚ or physical state. For example when water changes to ice. d. chemical change - A chemical change always involves the formation of a new substance. Gas bubbles
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The universe is comprised of one hundred eighteen elements that either occur naturally or as laboratory productions. Of these‚ six of them are crucial to the vitality and sustainment of life. These include carbon‚ hydrogen‚ nitrogen‚ oxygen‚ phosphorus‚ and sulfur. For a molecule to be considered organic‚ it must contain rings or chains of carbon (Volesky). A molecule is a chemical species encompassing several or many nonmetal atoms. The atoms bond covalently. In other words‚ the electrons in the
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- an Ancient Greek philosopher who was born in Abdera‚ Thrace‚ Greece. He was an influential philosopher who formulated an atomic theory for the universe. Antoine Lavoisier (1778 & 1783) - A French nobleman and chemist central to the 18th-century Chemical Revolution and a large influence on both the histories of chemistry and biology. He recognized and named oxygen in 1778 and hydrogen in 1783 Joseph Louis Proust (1799) - a French chemist which discovered each pure compound has its own characteristic
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