What You Need To Know for the Chemistry Regents Exam The Test The Chemisty Regents Exam is broken down into three sections: Part A: 35 mulitple choice questions from all units covered over the course of the school year. Part B: Approximately 25 questions‚ with a mix of short answer and multiple choice. Questions focus on the Reference Tables‚ graphing‚ and laboratory experiments. Part C: Approximately 15 short answer questions‚ most broken down into smaller parts. This is often an
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by Saponification Saponification is a process whereby the soaps are prepared by hydrolyzing fats or oils under alkaline conditions. It is also the alkaline hydrolysis of esters using alkaline solutions. Fats/ Vegetable oils + concentrated alkalis – soap + glycerol (Fats- tallow from cow) ( Vegetable oils – palm oil or olive oil) For example‚ - Glyceryl tristearates ❑ is a naturally occuring esters ❑ found in fats or oils. Example of soap‚
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loss of acid from the body‚ and increasing bicarbonate in the body. This can be caused by vomiting. What are acidosis and alkalosis? Acidosis and alkalosis are terms used to describe the abnormal conditions that result from an excess of acid or alkali (base) within the blood. Normal blood pH must be maintained within a narrow range of 7.35-7.45 to ensure the proper functioning of metabolic processes and the delivery of the right amount of oxygen to tissues. Acidosis refers to an excess of acid
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called irritant contact dermatitis. This condition arises from working with substances that physically damage the skin when they came into contact with it. Among the chemicals that can cause this type of damage are many in common use such as acids and alkalis and organic solvents can dissolve the skin’s protective layer of oils‚ leaving it dry‚ cracked and vulnerable. Some strong irritants can cause immediate damage‚ resulting in serious skin burns. Many weaker substances may require days of contact before
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Background Research Scanning Tunneling Microscope; or STM‚ allows scientists to image or display crystalline material surfaces down to an atomic level. Basically; it shows the formation of surface atoms on conducting and semi-conducting materials such as metals‚ or metalloids. First invented by Gerd Binnig and Heinrich Rohrer in 1981; the Scanning Tunneling Microscope used quantum tunneling to extract atomically resolved images to understand the morphology of crystalline surfaces including both
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Edward Dickson CHE101 DS-01 Experiment Date 7/21/2013 Report Submitted 7/21/2013 Title: Experiment #8: Ionic Reactions Purpose: In this lab we will work with aqueous solutions of ionic substances and determine if they are soluble. If the solution appears milky than it is known as a precipitate reaction‚ meaning it is soluble‚ and that the ions separated and became surrounded by water. Precipitates in this experiment are electrically uncharged. To identify which compounds are
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Have you ever bothered to read patient information leaflets before taking medicine? That is the leaflet that often comes with a pack or box of medicine telling you everything you need to know about the medication. A recent report revealed that lack of clarity and trust affected patient’s attitude to information in prescription leaflets. According to the report‚ the patients sometimes see the information as ‘’scary’’ or ‘’confusing.’’ This has raised concerns about the quality of patient information
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he called them triads. In 1817‚ Dobereiner noticed that the atomic weight of strontium‚ Sr‚ was halfway between the weights of calcium and barium‚ which these elements possess similar chemical properties. He also noticed the same pattern for the alkali metal triad (Li/Na/K) and the halogen triad (Cl/Br/I). In 1829 Dobereiner proposed the Law of Triads which Middle element in the triad had atomic weight that was the average of the other two elements. Later‚ other scientists found other triads
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Tollen’s Reagent ( Ammonia cal silver nitrates). CH3–CHO+ [O] CH3COOH 3. From alkyl nitriles: Compounds having a cyanide ( –CN) group are called nitriles. Hydrolysis of an alkyl nitrile on boiling with mineral acid or alkalis yield corresponding carboxylic acid . R–CN +H2O RCOOH +NH3 CH3–CN + 2H2O+HCL CH3COOH + NH4CL 4. BY OXIDATIVE CLEAVAGE OF ALKENES: Alkenes when heated with alkaline KMNO4 are cleaved at double
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The equipment needed when making standard solutions includes; a volumetric flask‚ a glass beaker‚ two plastic weighing boats‚ scales‚ a spatula‚ and the sodium hydroxide. When using glassware in experiments‚ it must be flushed out to make sure that cross contamination does not happen and that the only thing that would then be coating the beaker is the distilled water. When all of the glassware has been cleaned‚ some sodium hydroxide should be placed in a plastic weighing boat next to the scales
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