Periodic Classification of Elements Classification of Elements according to electron configuration ( type of subshell being filled) *valence electrons –outer electrons of atom which are those involved in chemical bonding ; accounts for similarities in chemical behavior among elemens within each of this groups * Representative elements/ Main Group elements * Group 1A-7A * Incompletely filled s/ p subshells * Display a wide range of physical and chemical properties
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TECH0701: Measuring the Melting Points of Compounds and Mixtures Introduction This exercise dealt with the melting points of pure mandelic acid and benzoic acid. The eutectic temperature and composition of mandelic and benzoic acid mixtures were determined. And finally‚ an unknown was identified by its mixtures and melting point. The melting point of a compound is used by organic chemists not only to identify the compound‚ but also to establish its purity. To determine the melting point two
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CSEC CHEMISTRY NOTES ON SOLUBILITY OF COMPOUNDS IN WATER and SATURATED SOLUTION Reference: Chemistry‚ a Concise Revision Course for CXC by Anne Tindale From Chemistry for CSEC by Tania Chung-Harris and Mike Taylor Factors that influence solubility Temperature * The solubility of solids in liquids generally increases as temperature increases. * The solubility of gases in liquids generally decreases as temperature increases. (gases are less soluble in warm water than in cold water)
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Here’s a good example from engineering. An aerospace engineer might want to graph the lift of a wing versus the size of the wing‚ and he wants to show everything from an insect wing all the way up to a jumbo jet. A fly’s wing is maybe 0.1 inch long‚ and a jumbo jet wing might be 1000 inches long (about 80 ft). It would be pretty tough to put more than one insect on that graph - if you scale the wing length axis to fit on a sheet of paper‚ all the points for insect wings would be jammed up against
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Tony Robbins introduces these chapters by continuing to talk about and develop in our minds the potential of compound interest. He gave some great examples that showcase how such a little amount of money can blossom into more money than you could have ever imagined. In the first chapter Tony Robbins really drive home the incredible value on committing to a percentage of money that you will set aside every time you receive a paycheck. He stressed the importance of setting this percentage aside
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symptoms. However they may cause an "acid rebound"‚ a condition whereby the gastric acid returns in greater concentration after the drug effect has ceased. Moreover‚ this class of antacids is not suitable for all patients owing to its components. For example‚ the usually high concentration of sodium bicarbonate present in these chemical antacids may be inappropriate for patients afflicted with hypertension or kidney failure. Non Absorbable Antacids The non-absorbable antacids though less prone
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producing another action potential (Stillman‚ 2005). In this lab‚ compound action potentials (CAPs) will be measured from an isolated sciatic nerve from a cane toad‚ Bufo marinus. Compound action potentials are the total sum of action potentials from the multitude of neurons that compose a nerve (Stillman‚ 2005).
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Analysis of Alum‚ AlK(SO₄)₂ •12H₂O Purpose The purpose of the experiment is to confirm whether the compound is Alum. Introduction Percent composition is defined as part divided by whole multiplied by 100. Water of hydrogen is defined as the amount of water produced into a molecule prepared in an aqueous solution. Molecular formula indicates the actual numbers and type of atoms in a molecule (notes). Procedure The procedure in this experiment is to determine melting point and mole ratio of
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Discussion for Experiment 1 (Basic Laboratory Operations and Identification of a compound : Chemical Properties) In the first experiment‚ the precision of instrument was studied by measuring the mass of water for several times. The result shows that the mass measurement of the balance is precise since the masses of water in six trials are somewhat close. The reason that the masses of water in each trial are not identical may come from the high sensitivity of the balance that keep fluctuating due
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We underwent two different reaction schemes using Dipotassium phosphate (K2HPO4) and Potassium hydroxide (KOH) to isolate the compounds of pure Acetylsalicylic Acid/Aspirin and N-(4-hydroxyphenyl) Ethanimidate/Acetaminophen respectively from Excedrin. The first reaction scheme to undergo acid-base organic extraction was to isolate the most acidic compound in Excedrin with a weak base‚ K2HPO4. We isolated the aspirin using aqueous base extraction‚ with Dipotassium phosphate then treated with HCl
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