CHEM 1411 – General Chemistry I Practice Problems‚ Chapters 1–3 Chapter 1 – Chemistry: The Study of Change 1. Element‚ compound‚ homogeneous mixture (solution)‚ or heterogeneous mixture: a) orange juice b) brass c) 0.9% saline (NaCl) solution d) garden soil e) room air f) methane gas g) sodium metal h) N2 gas i) Cu(NO3)2 crystals (freshly-squeezed) 2. Define (some of these terms are found in Chapters 2 and 3): a) c) e) g) i) k) m) o) 3. b) d) f) h) j) l) n) compound physical change
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Amanda Jornd Experiment 7- Synthesis and Reactivity of tert-Butyl Chloride Via an SN1 Reaction Introduction/Background: Alkyl halides are compounds in which a halogen atom replaces a hydrogen atom of an alkane. Alkyl halides are classified as primary‚ secondary or tertiary depending on the number of alkyl substituents directly attached to the carbon attached to the halogen atom. The purpose of this lab was to properly prepare t-butyl chloride from t-butyl-alcohol in a concentrated hydrochloric
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I- :2S2O32I2 + 2e S4O62- + 2e 2I- The iodine/thiosulphate titration is a general method for determining the concentration of an oxidising agent solution. A known volume of an oxidising agent is added into an excess solution of acidified potassium iodide. The reaction will release iodine:Example: (a) With KMnO4 2MnO4- + 16H+ + 10I(b) With KIO3 IO3- + 5I+ 6H+ 3I2 + 3H2O 2Mn2+ + 5I2 + 8H2O The iodine that is released is titrated against a standard thiosulphate solution. From the stoichiometry of the
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which of the two will reacted with potassium iodide inside the breaker‚ as the latter passed from the beaker into the tube‚ the glucose/starch solution’s change of color showed that the potassium iodide was small enough that it able to pass through from the solution and into the bag. After the Benedict test‚ glucose from the bag was also founded small enough that it can exit from the bag and into and solution. In the end‚ glucose and potassium iodide was the only two that is capable to move freely
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A. MATTER * Nature of matter. * Describe the states of matter and explain their conversion in terms of the kinetic particle theory. * Describe and explain diffusion. * Describe dependence of rate of diffusion on molecular mass‚ qualitatively. * Experimental techniques Measurement. * Name appropriate apparatus for the measurement of time‚ temperature‚ mass and volume‚ including burettes‚ pipettes and measuring cylinders. Criteria of purity. * Identify substances
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Abstract Tamoxifen‚ most commonly sold under the brand name Nolvadex‚ is the most widely used drug in the treatment of breast cancer during both early and late stages. It belongs to a class of drugs known as SERMs (Selective Estrogen Receptor Modulators). SERMs work by blocking the estrogen receptors in breast cells to prevent any binding with estrogen. It is consumed orally as a tablet or as a liquid (Anon.‚ 2017). The following paper discusses the discovery of Tamoxifen‚ its laboratory synthesis
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CHEMISTRY TRIAL 2011 MARKING SCHEME PAPER 2 4541/2 http://cikguadura.wordpress.com © Trial2011 Hak Cipta Sekolah Berasrama Penuh SULIT SULIT 2 MARKING SCHEME FOR CHEMISTRY PAPER 2 4541/2 No. 1. (a) (i) (ii) Answer Zinc Mark 1 1 1 1 1 1 1. The presence of X/zinc atoms disrupts the orderly arrangements of copper atoms 2. This reduce the layers of atoms from sliding over one another easily Steel Silicon dioxide/silica /sand Heat resistant/can withstand with high temperature (iii) (b)(i)
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terms of productivity‚ illness‚ increased health care costs and death. Every day‚ more than 6‚000 children below the age of five die in India. More than half of these deaths are caused by malnutrition-mainly the lack of Vitamin A‚ iron‚ iodine‚ zinc and folic acid. About 57% of preschoolers and their mothers have subclinical Vitamin A deficiency. Anemia prevalence among children under five years is 69% and among women it is over 55% in a recently concluded national study. With the scientific
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this example‚ magnesium is above copper in the activity series so it is able to displace copper. An example of an anion replacement reaction is the reaction of bromine and potassium iodide‚ which produces potassium bromide and iodide (Br2 + 2KI 2KBr +I2). In this example‚ bromine replaces iodide in the potassium iodide
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List: Sodium carbonate solution Copper sulphate solution (Safety: High toxicity) Sodium hydroxide solution (Safety: Irritant) Ammonia solution (Safety: Toxic by inhalation) Potassium iodide solution (Safety: Mild irritant) Lead nitrate solution (Safety: Toxic) Sulphuric acid (Safety: Corrosive) Copper carbonate Silver Nitrate (Safety:
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