The element I chose is Sulfur. Sulfur’s symbol is S‚ and it’s in the Chalcogen family. Sulfur has a lot of roles to play in our bodies. It’s also one of the abundant elements in our bodies with a mass percentage of 0.2. Sulfur’s atomic number is 16‚ and its Mass number is 32.066. In addition‚ Sulfur is a non-metal. Sulfur has multiple physical and chemical properties; one of the physical properties is that Sulfur is insoluble in water. A chemical property for Sulfur is that it’s a very reactive element
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combine to form a more complex product. A + B ? AB The combination of iron and sulfur to form iron (II) sulfide is an example of a synthesis reaction: 8 Fe + S8 ? 8 FeS Learn More About Synthesis Reactions Chemical Decomposition or Analysis Reaction In a decomposition reaction a compound is broken into smaller chemical species. AB ? A + B The electrolysis of water into oxygen and hydrogen gas is an example of a decomposition reaction: 2 H2O ? 2 H2 + O2 Single Displacement or Substitution Reaction
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that way if you believe in the power of change. Hydrogen fuel is that change for the automobiles of the future. Hydrogen has been used for decades‚ but mostly for commercial use. Each year‚ we get closer to removing the oil company’s choke hold on our wallets. It’s time to drive with a lighter purse and a cleaner environment and it’s time for hydrogen fuel. The two largest points of debate with hydrogen fuel are cost and production Hydrogen fuel is a cheaper alternative to our current source
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forms. Organic arsenic is combined with carbon and hydrogen‚ where inorganic binds with elements such as oxygen‚ chlorine and sulfur. Common inorganic compounds of arsenic are trivalent arsenic and pentavalent arsenic; and two reocurring organic compounds are monomethyl arsonic acid and roxarsone. Arsenic is released into the air by volcanoes‚ erosion of minerals and metals‚ and through industrial processes. Weathering of rocks containing sulfides causes dissolution of arsenic into rain‚ rivers‚
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Periodic Table Trends: Atomic Radius - half of the distance between the centers of two atoms that are touching each other decreases moving left to right increases moving top to bottom Ionization Energy - energy required to remove an electron increases moving left to right decreases moving top to bottom Electron Affinity - ability to accept an electron alkaline earth elements have low electron affinities halogens have high electron affinities noble gases have electron affinities near zero
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at pH = 7 would be: A. +2 B. +1 C. 0 D. -1 E. -2 5. The sequence of monomers in any polymer is this type of structure: A. primary structure B. secondary structure C. tertiary structure D. quaternary structure E. All of these 6. Hydrogen bonds are most important in this type of structure in proteins: A. primary structure B. secondary structure C. tertiary structure D. quaternary structure E. All of these 7. The overall folding of a single protein subunit is called: A
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content typically varies between 5 and 100 ptb. Chlorides Crude oil brine analysis varies‚ with 75 percent sodium chloride‚ 15 percent magnesium chloride‚ and 10 percent calcium chloride considered average. Chloride salts are the source of hydrogen chloride that is evolved during distillation. Magnesium chloride is the most prolific producer of HCI with calcium chloride and sodium chloride ranking second and third‚ respectively‚ in HCl production. As the concentration of a chloride decreases
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GRADE 11 CHEMISTRY (30S) Final Practice Examination Answer Key GRADE 11 CHEMISTRY (30S) Final Practice Examination Answer Key IInstructions The final examination will be weighted as follows Modules 1–3 Modules 4–6 The format of the examination will be as follows: Part A: Fill-in-the-Blanks Part B: Multiple Choice Part C: Short Answer Total Marks Include units with all answers as required. Useful Information You will need the following in order to complete this examination: n n n n 15–20% 80–85%
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Year 8 geography- global organization. Part A Organization 1 amnesty international a) what is Amnesty international Amnesty international is a democratic organization which is not funded by the government or other political party that complains to the government or other organizations for abusing human rights or falling to protect people. Plus amnesty international defends human rights for people whenever there are violated. b) what does amnesty international do The things that amnesty international
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Kinetics of Hydrogen Peroxide February 22‚ 2007 Chem. 1130 TA: Ms. Babcock Room 1830 Chemistry Annex PURPOSE OF THE EXPERIMENT Kinetics of Hydrogen Peroxide The major purpose of this experiment is to determine the rate law constant for the reaction of hydrogen peroxide and potassium iodide. In this experiment‚ the goal will be to try to measure the rate law constant at low acidity‚ since at low acidity‚ anything less than 1.0 x 10-3M‚ the effect of the hydrogen ion is negligible. To calculate
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