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chemical reaction, 메탈 반응에 관한 화학or 물리 실험 리포트

Chemical Reactions : Reactions of MetalsLab 6PHYS – 101Technical Physical SciencePurpose:The purpose of this lab is to predict and observe the experiment between metals and other compounds then write the balanced formulas for chemical reactions with metals.Objectives:To understand elements, especially metals state and characteristics then to recognize the difference in an element in states.To study properties of various metals and predict the compound reactions.To perform and observe the reactions of various compounds.To identify the chemical reactions by reacting metals with other compounds.To write balanced chemical equations for each single and double displacement reactions.BackgroundElements have electrons in their shells and the elements want to be inert by the reaction of electrons outer shell. This phenomenon occurs to make the elements loss or gain electrons and lead to chemical reaction as like compound metals and nonmetals. When the elements loss or gain electrons are chargedew substances, it shows some bubbles or color changes or precipitates.This experiment follows two types of replacement reactions:Single or Simple Replacement ReactionsThe general form A + BC B + ACA is an element and BC is usually an aqueous ionic compound or an acid.When they replaced new ionic compound with AC, B is new substance.If B is a metal it will appear as precipitates, and if it is a gas, it will appear as bubbles. The active metals, which are IA and IIA in Periodic Table, produce a hydroxide and hydrogen gas when they react with water. Above the activity series, if A has a higher activity than B, a single displacement reaction will happen, but if A has lower activity than B, it will not happen.Ca + 2Ag(NO3) Ca(NO3)2 + 2AgIonic compound --Solid metallic deposits2Al + 6HCl 2AlCl3 + 3H2Acids – Hydrogen gas2Na + 2H2O 2 NaOH + H2Water—Hydrogen gasDouble displacement reactionsThe general form AB + CD AD + CBTwo substances AB and CD are usually aqueous ionic compounds or acids, andtrate, Ca(NO3)2Lead (II) nitrate, Pb(NO3)2Potassium iodide, KIPotassium chromate, K2CrO4ProcedureLab Safetywear gogglesuse protective glovesproperly dispose of waterIn this lab, we try to check the experiment reactions at a distance of time. Metals will be reacted with other compound, and there will be a difference on the chemical properties of the reactants and products. Some reaction can be observed immediately, others may take few minutes.For each reactionWrite a chemical reaction and describes what occurred.Write a correct balanced equation each reactant.Determine whether the reaction is in agreement with the activity series table.Single Displacement ReactionsReactions of Metals (Al, Mg, Zn, & Cu) with Hydrochloric AcidReactions of Metals (Al, Mg, & Zn) with Copper(II) chloride solutionReactions of Metals (Al, Mg, & Zn) with Calcium nitrate solutionUsing the data activity series information, predict the reaction for each metal with ionic compound solutions.Using the test tubes in e2HClZnCl2+H2Cu+HClN RobservationReactedRapidly bubbled, released gas.Slightly purple clear liquidReacted.Rapidly bubbled, released gas.Going to be clear liquid.ReactedRapidly bubbled, released gas.Clear liquidNo reacted, no gas.Liquid color changed –> HCl cleaned up Cu surfacePredictionCorrect?yesyesyesyesCuCl2PredictionmetalsmetalsmetalsBalanced formula2Al+3 CuCl22AlCl3 + 3CuMg+ CuCl2MgCl2 + CuZn + CuCl2Zn Cl2 + CuobservationReacted.Little bubbled.Clear liquid, brown solid precipitates.Reacted.Unclear light green liquid, brown solid precipitates.Reacted.Blue liquid with black solid precipitates.PredictionCorrect?yesyesyesCa(NO3)2PredictionAl+Ca(NO3)2 N RMg+Ca(NO3)2N RZn+Ca(NO3)2N RBalanced formulaAl, Mg, and Zn those metals activity level is lower than Ca. It will be not react with Ca(NO3)2observationNo reactionNo reactionNo reactionPredictionCorrect?yesyesyesTable 2- Double Displacement Reactionspp: precipitatesPb(II)(NO3)2AgNO3Ca(NO3)2Ba(CH3CO2)2KIBalanced formulaPb(II)(NO3)2+2KI 2Kts showed how the metal reacted with other compound substances according to the activity series table and confirmed the prediction.Metals with an acid produced a new substance with Hydrogen gas, metals with higher activity metal ionic compound produced solid metallic deposits and metals with lower activity metal ionic compound did not reacted. These single displacement reactions balanced equations are in the data table1.Also, we did double displacement reactions;We used two chemical compound solutions, which are metal and other ionic compounds. We put them together in each spot in the plate. Lead (II) nitrate, Silver nitrate, Calcium nitrate, and Barium Carbonate are used in combination with Potassium iodide, Sodium sulfate, Potassium Chromate, and Sodium carbonate.The results showed how two aqueous ionic compounds exchanged to make new substances with precipitates. Most precipitates’ color depends on the characteristic of the precipitate elements. Some of the combined solution did noton.

자연과학| 2011.09.28| 8페이지| 2,000원| 조회(93)

metal reaction, Chemical Reaction, single ..

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