material. It is used as a crushed stone for road base and railroad ballast. It is used as an aggregate in concrete. It is fired in a kiln with crushed shale to make cement. Gold: Gold is a dense‚ soft‚ shiny‚ malleable and ductile metal. It is a chemical element with the symbol Au (aurum in Latin‚ meaning glow of sunrise) and atomic number 79.It has a bright yellow color and luster traditionally considered attractive‚ which it maintains without oxidizing in air or water. It is found in Abuja‚ Abia‚ Ebonyi
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Sulfur Physical and chemical properties: Sulfur is classified as an odourless‚ tasteless‚ soft‚ light yellow solid. It is insoluble in water‚ but is soluble in carbon disulfide. Sulfur is very reactive; it reacts with all metals except gold and platnium‚ forming sulfides. It also forms compounds with various non-metallic elements. Sulfur forms over 30 solid allotropes. Sulfur is a chalogen (group 16 of the periodic table) and a non metal. Sulfur’s atomic weight is 32.06. It has 16 electrons‚ protons
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Purpose/Objective The purpose of this experiment is to identify the periodic trends in the solubility of the alkaline earth metals and compare the results to that of lead Materials 1. Pencil 2. Lab notebook 3. 5 small test tubes 4. Droppers Chemicals 1. 0.2 M Mg(NO3)2 2. 0.2 M Ca(NO3)2 3. 0.2 M Sr(NO3)2 4. 0.2 M Ba(NO3)2 5. 0.2 M Pb(NO3)2 6. 1 M NaOH 7. 0.2 M NaBr 8. 0.2 M NaI 9. 0.2 M Na2SO4 10. 0.1 M Na2CO3 11. 0.2 M Na2C2O4 12. 1 M NaCl Data and Results Mg(NO3)2 Ca(NO3)2
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main elements in each bag of fertilizer. They are nitrogen‚ phosphorus and potassium and are represented on the outside of the bag in that order. Each of the three elements has a different benefit to the growth of a plant. Plants use nitrogen to digest proteins‚ nucleic acids and hormones. When a plant is lacking in nitrogen‚ it may have stunted growth and yellowing leaves. Phosphorus is also very important to plant growth. It assists in converting the sun’s energy and other chemicals into
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-Dmitri Mendeleev- first periodic table‚ organized 63 known elements according to properties‚ organized into rows and columns and wrote name‚ mass‚ and chemical properties on each -Julius Lothar Meyer- independently worked in Germany‚ similar to Mendeleev -Henry Gwyn Jeffreys Moseley- Worked with Ernest Rutherford‚ experimented with 38 metals‚ he found that the positive charge of each element’s nucleus increased by one from element to element as they were arranged in Mendeleev’s periodic table‚ lead
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....................................................................................4 Johann Wolfgang Döbereiner Periodic Table The periodic table is a chart used in chemistry that shows chemical elements in order of their atomic number. Three of the people which contributed to the final production of the periodic table‚ are Dmitri Mendeleev John Newlands Johann Wolfgang Döbereiner Dmitri Mendeleev February 8‚ 1834 in Tobolsk
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Exam Chemistry Project Sunday‚ January 13‚ 2013 Grade/Section: Date: Question I: State whether each statement is true or false‚ then correct each incorrect statement. (7pts‚ 1 point each) 1- An Element is a substance that can be broken down into simpler substance by chemical means. 2- The Aufbau Principle states that energy levels must be filled from the highest to the lowest‚ when writing the election configuration. 3- Atomic radius decreases across a period and increases
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acknowledged of the existence of elements‚ but only knew of common ones like gold‚ tin‚ and copper. It wasn’t until the middle of the nineteenth century when about 50 elements were discovered and scientists began to wonder if the elements vary from each other or if a pattern is represented in the arrangement of the elements. A number of scientists tried different kinds of patterns. For example‚ the German scientist Johann Wolfgang Döbereiner tried grouping the three halogens elements (chlorine‚ bromine‚ and
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-In covalent bonding one atom completely shares its valence electrons with another atom (west coast and west coast) Example: H2O‚ CO2 2. How is electronegativity used in determining the ionic or covalent character of the bonding between two elements? A: A large difference in electronegativity between two atoms in a bond will result in ionic bonding. A small difference in electronegativity between two atoms will result in covalent bonding. Translation: Electronegativity difference between
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Periodic Table The periodic table has been updated all throughout history. Elements have been around us since the beginning of time. Elements‚ such as gold and silver‚ are examples of these elements that have been known for centuries. The periodic table allows us to see the elements in their families so we can understand what properties they have. It also allows us to see the atomic number‚ atomic mass‚ and the symbol of the element. The periodic table is a source of knowledge that is still being updated
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