关于英文版化学实验报告
篇一：英文版化学实验报告
Title: Preparation of Fe scrap from waste
(NH4) 2SO4.FeSO4.6H2O
The purpose of the experiment
Learn the method used scrap iron preparation of ferrous ammonium sulfate.
Familiar with the water bath, filtered, and evaporated under reduced pressure and crystallization basic working.
The experimental principle, the iron and sulfuric acid to generate reactive ferrous sulfate, ferrous sulfate and ammonium sulfate in an aqueous solution of equal molar interaction, becomes less soluble blue generate ferrous ammonium sulfate.
Fe+H2SO4=FeSO4+H2 (gas)
FeSO4+ (NH4)2SO4+6H2O=(NH4)2SO4.FeSO4.6H2O Usually ferrous rocks are easily oxidized in air, but after the formation of relatively stable perfunctory, not to be oxidized.
Experiment to use instruments, scales, constant temperature water bath, pumps, basins, cups, 10ml graduated cylinder, asbestos mesh, glass, tripod, alcohol lamp, funnel.
Iron pieces to a solid pharmaceutical use, use of acid ammonium sulfate and 3mol / l of sulfuric acid, concentrated sulfuric acid.
The experiment was divided into four steps.
The first step Said iron powder 4g into a beaker and then 50ml 10ml, 3mol / L H2SO4 was added to the same beaker. The second step will be the beaker is heated to no more bubbles, and then filtered hot and the filtrate was then filled in 100ml beaker. The third step, called 4g (NH4)2SO4, and the resulting
ammonium sulfate and 5.3ml of water to form a saturated solution, and then add it to the ferrous sulfate solution, adjusted with concentrated sulfuric acid to PH = 1. A fourth step, the third step the solution was heated in a water bath to the surface until the film is crystallized, it was slowly cooled and
then filtered under reduced pressure to stand finally dried, weighed and the yield was calculated. The results obtained 8.1g bluish powdery
crystals. Have this result we can calculate yield, starting with the first step we tried to know the amount of iron, should this we can calculate the theoretical sulfate ferrous sulfate is 0.03mol, then ferrous sulfate obtained by the
0.03molFeSO4 theoretical value of ammonium. FeSO4+（NH4）2SO4+6H2O=FeSO4.(NH4)2SO4.6H2O 0.03molX mol X=0.03mol
m=XM=0.03molⅹ392g/mol=11.76g
Yield = the actual value of the formula is divided by the theoretical value by 100%.it will be calculated into the data obtained in a yield of 68.9%.
篇二：英文版化学实验报告
The preparation of alkali type copper carbonate
The first:the experiment purpose
1.Master the methods of alkali type copper carbonate prepared and principle
2.Through the design experiment to cultivate independent design ability and chemical research thinking
The second:the experimental principle
The solubility of Cu(OH)2and CuCO3 are similar, With Cu2(OH)2CO3 solid precipitation in the solution.
2CuSO4+2Na2CO3+H2O==Cu2(OH)2CO3↓+2Na2SO4+CO
2↑
The third:the experimental steps
1.Solution preparation
Disposes 0.5 mole of each litre acid sour coppers and sodium carbonate solution each 100 milliliters.
2.The feeding order and raw material compare the exploration
According to 2:1.6,2:2,2:2.4,2:2.8 allocated proportion, is accepted after passing an examination the surface disposition acid sour copper and the sodium carbonate solution, joins in separately 8 test tubes, joins rapidly the sulfuric acid copper solutions in the sodium carbonate solution, vibrates about other constant temperature ten minutes as for 75 degrees Celsius water baths in, the inversion feeding order recreates one time, the observation has the precipitation speed, quantity how many and the color,
discovers the optimum condition.
3.Temperature exploration
According to the above optimum condition, takes the acid sour copper solutions and the sodium carbonate solution separately under 50, 75 and 100 degrees Celsius responded that, discovers the optimum temperature.
4.According to 2, 3 step exploration optimum condition prepares the final product, and with the distilled water lavation, finally dries and calls heavily.(Enlarges ten times with conical flask to do)
The fourth:the experimental items
Instrument and material: The balance, the beaker, the glass rod, the Volumetric flask, the test tube, the filter flask,the Buchner funnel, the Erlenmeyer flask
Chemicals: Copper carbonate, sodium sulfate
The fifth:the experimental result
1.By the step 2, the observation phenomenon optimum condition is equal to for the cupric sulfate compared to the sodium carbonate 2:
2.4, the feeding order for joins the sulfuric acid copper solutions to the sodium carbonate solution in.
2.By the step 3, the observation phenomenon optimum temperature is 75 degrees Celsius
3.According to the copper sulfate solution than sodium carbonate
solution is 2:2. 4, ten times magnification, alkali type copper carbonate was zero point five grams, according to the reaction equation calculation yield.
2CuSO4+2Na2CO3+H2O==Cu2(OH)2CO3↓+2Na2SO4+CO 2↑
2 1
0.5*0.02 X
2/(0.5*0.02)=1/X
X=0.005
M[Cu2(OH)2CO3]=0.005*222=1.11g
Productive rate:0.5/1.11*100%=45%
The sixth : Questions
1. Which cupric salt suit the system to take the cupric basic carbonate? Answer:Cu(NO)3 or CuSO4
2. The reaction temperature has what influence to this experiment?.
Answer:The temperature excessively is low, the response speed is slow; The hyperpyrexia, the Cu2(OH)2CO3 decomposition is CuO.
3. Reaction is carried out at what temperature will appear
Brown product? What is the brown substance?
Answer: The temperature is equal to 100 degrees Celsius and this brown material is CuO.
篇三：化学专业英语实验报告
In the physiological saline the sodium chloride content determination
one, the experimental goal
1、 the study silver nitrate standard solution configuration and the demarcation method
2、 the grasping law raises Si Fa to determine the chloride ion the method principle two, the experimental principle With AgNO3 standard solution titration Cl - Ag + + Cl - = = AgCl，At ph 7.0 -10.5 available fluorescent yellow do indicator (HFIn)
HFIn = = FIn (yellow) + H +
Sp before: excessive, AgCl precipitation adsorption of Cl - AgCl Cl - + FIn - (yellow-green)
After Sp: Ag +, excessive AgCl precipitation Ag + adsorption, adsorption FIn - reprecipitation AgCl, Ag + + FIn - = = AgCl, Ag +, FIn - (pink) The finish color changes: from yellowish green to orange Three, instruments and reagents
Equipment and materials：Acid type buret (150 ml), taper bottle (250 ml), volumetric flask (100 ml), pipette (20 ml, 10 ml), measuring cylinder (100 ml, 10 ml), beaker (100 ml), brown reagent bottles (500 ml), analytical balance, platform scale. The reagent and drug: Analysis of AgNO3 (s, pure), NaCl (s, analysis of pure), physiological saline, fluorescent yellow - starch. Fourth, the experimental steps
Accurately moving 25 ml concentration is 0.7064 mol ╱ L of silver nitrate standard solution in the middle of 250 ml volumetric
flask, dilute to scale as a standard solution titration.
Accurately moving saline 10.00 ml to 250 ml conical flask, add 50 ml water, 3 drops of fluorescent yellow indicator, 5% starch indicator 5 ml, under continuous agitation, using silver nitrate
standard solution titration to solution from yellow to pink is the end point. Record the consumption volume of silver nitrate standard solution, parallel determination of 3, calculate the sodium chloride content in saline and relative mean deviation.
Fifth, data recording and processing
Formula: ρ = V×MrNaCl×CAgNO3 x 100
The average deviation d=0.01300 dr=d/ρ×100%=0.13%
高一化学的实验报告相关内容:半导体工艺化学实验报告 实验名称：硅片的清洗实验目的：1.熟悉清洗设备2.掌握清洗流程以及清洗前预准备实验设备：1.半导体兆声清洗机（SFQ-1006T）2.SC-1；SC-2实验背景及原理：清洗的目的在于清除表面污染杂质，包括有机物和无机物。... 化学实验报告的范例 化学实验报告的范例【1】化学实验报告格式例一定量分析实验报告格式（以草酸中h2c2o4含量的测定为例）实验题目：草酸中h2c2o4含量的测定实验目的：学习naoh标准溶液的配制、标定及有关仪器的使用；学习碱式滴定管的使用，练习滴定操作。... 卤素元素的化学性质实验报告 一、教学目标（一）掌握Cl2、Br2、I2的氧化性及Cl-、Br-、I-还原性。（二）掌握卤素的歧化反应（三）掌握次氯酸盐、氯酸盐强氧化性（四）了解氯化氢HCl气体的实验室制备方法（五）了解卤素的鉴定及混合物分离方法二、教学的方法及教学手段... 《排水集气法》的化学实验报告 实验名称:排水集气法实验原理：氧气的不易容于水仪器药品:高锰酸钾，二氧化锰，导气管，试管，集气瓶，酒精灯，水槽实验步骤:①检----检查装置气密性。... 关于英文版化学实验报告 篇一：英文版化学实验报告Title: Preparation of Fe scrap from waste(NH4) 2SO4.FeSO4.6H2OThe purpose of the experimentLearn the method used scrap iron preparation of ferrous ammonium sulfate.... 化学实验报告模板 如何写化学实验报告呢?那么，下面是给大家分享的化学实验报告模板，供大家阅读参考。化学实验报告模板12NaOH+CuSO4=Cu(OH)2[此有一个箭头表沉淀]+Na2SO4氢氧化钠溶液和加入硫酸铜溶液反应成氢氧化铜沉淀和硫酸钠Cu(OH)2=[等... 化学实验报告 初高中想必精彩接触化学实验，那么，下面是给大家整理收集的化学实验报告，供大家阅读参考。化学实验报告11:实验目的，具体写该次实验要达到的要求和实现的任务。... 化学探究实验报告集锦 篇一：化学探究实验报告1化学探究实验报告1（实验A）实验名称：小苏打加白醋后的变化反应实验目的：探究小苏打和白醋混合后的化学反应实验过程：1，将两药匙小苏打加
化学实验报告英文 Chemical Experiment Report Introduction: Chemical experiments play a crucial role in the field of chemistry as they allow scientists to observe and understand the behavior of various substances and their reactions. This report aims to present the findings and observations from a recent chemical experiment conducted in the laboratory. Experimental Procedure: The experiment focused on the synthesis of a compound through a series of chemical reactions. Firstly, the required chemicals were gathered, including reactants, catalysts, and solvents. Careful measurements were made to ensure the accurate mixing of the substances. The experiment involved several steps, each with specific reaction conditions and timeframes. The reactions were conducted in a controlled environment, maintaining a constant temperature and pressure. The progress of each reaction was monitored using various analytical techniques, such as spectroscopy and chromatography. Results and Observations: The experiment yielded fascinating results and provided valuable insights into the chemical properties of the substances involved. The reaction kinetics were carefully studied, and the reaction rates were determined. This information can be crucial in understanding the efficiency of the reaction and optimizing the
Preparation of n -bromobutane 一、Purpose 1、Study the principle and method of preparing n-butyl bromide from n-butyl alcohol by treatment with sodium bromide and concentrated sulfuric acid 2、Learn the technique of reflux with a gas trap apparatus and washing. 二、Principle n-Butyl bromide can be easily prepared by allowing n-butyl alcohto react with sodium bromide and concentrated sulfuric acid. Main reactions ： NaBr + H 2SO4 → HBr + NaHSO4 24 H SO 322232222CH CH CH CH OH HBr CH CH CH CH Br H O +???→+ Secondary reactions ： 24H SO 32223222CH CH CH CH OH CH CH CH=CH H O ???→+； ()24H SO 32223222222CH CH CH CH OH CH CH CH CH O H O ???→+ 24222H SO HBr Br SO H O +??→++ 三、Materials n-butyl alcohol ：4mL Sodium bromide ：5g Concentrated sulfuric acid ：2.5mL/6mL Anhydrous calcium chloride:0.5g 10% aqueous sodium hydroxide:5mL 四、Primary reagent And Product physical constants
英文版的化学实验报告 英文版的化学实验报告 Introduction: Chemical experiments are an essential part of scientific research and education. They provide valuable insights into various chemical reactions and help us understand the properties and behavior of different substances. In this report, we will discuss the process and findings of a chemical experiment conducted to investigate the reaction between hydrochloric acid and sodium hydroxide. Experimental Procedure: 1. Materials: The materials used in the experiment included hydrochloric acid (HCl), sodium hydroxide (NaOH), distilled water, a burette, a conical flask, a pH meter, and a magnetic stirrer. 2. Preparation: A solution of hydrochloric acid was prepared by diluting a given volume of concentrated hydrochloric acid with distilled water. Similarly, a sodium hydroxide solution was prepared by dissolving a specific amount of sodium hydroxide pellets in distilled water. 3. Setup: The burette was filled with the sodium hydroxide solution, and the conical flask was placed on the magnetic stirrer. The pH meter was calibrated according to the manufacturer's instructions. 4. Titration: The hydrochloric acid solution was slowly added to the conical flask while stirring continuously. The pH meter was used to monitor the change in pH during the titration process. The addition of hydrochloric acid was stopped when
Title The title for the lab report may be provided by your lecturer. If not, you will need to make up your title. It should be brief, informative, and interesting. It is not usually a sentence. You should aim to provide just enough information in the title to avoid it being overly general. The key is to be concise and meaningful. Check with your lecturer if you need to include a title page and ensure all the relevant information is supplied. This will include your name, student number, date of the experime nt, the demonstrator’s name and the group you belong to. Introduction The introduction should be clear and concise. It should tell the reader what to expect in the report. An introduction generally includes the following elements: ? Problem – State the issue investigated by the experiment. ?Background –Briefly summarise previous research on the topic and narrow the scope of the study. ? Objectives – State the aim of the experiment and state the methods used. ? Hypothesis – If this is not already given, you must formulate this in unambiguous terms. The introduction is written in the past tense following the scientific style of writing. Materials and methods This section should contain a clear enough explanation of how you conducted the experiment so that someone wishing to replicate the procedure may be able to do so. Here you should describe the experimental design, the treatments and the apparatus you used. You should follow the rules for the conventional descriptions of chemicals. The standard practice is not to use trade names for chemicals. Instead you should use the generic or chemical names. Standard apparatus should be described in proper technical terms. Also, you should describe the procedures and methods of measurement you used. At the end of this section you should provide details of how you analysed the data. If this involved lengthy statistical calculations, these should be attached as an appendix. Results and discussion This section should be organised in a systematic way such that you first present the results and then discuss them. To report on results you should describe what happened. This is perhaps the most important section of your report because it is where you report the data upon which your conclusions are based. Accuracy, clarity of expression and systematic presentation of the data (e.g., use of tables, graphs, figures, diagrams, etc.) are key factors here. Take note that tables and figures do not simply repeat information given in the text –they are meant to summarise, amplify, or complement it. You should report first the results that bear directly on the title of your lab report. Any other interesting findings should follow this. If the experiment had more than one hypothesis, you may want to organise your results in a way that reflects this. A key
报告编号：YT-FS-8612-63 分析化学实验报告范文 (完整版) After Completing The T ask According To The Original Plan, A Report Will Be Formed T o Reflect The Basic Situation Encountered, Reveal The Existing Problems And Put Forward Future Ideas. 互惠互利共同繁荣 Mutual Benefit And Common Prosperity
分析化学实验报告范文(完整版) 备注：该报告书文本主要按照原定计划完成任务后形成报告，并反映遇到的基本情况、实际取得的成功和过程中取得的经验教训、揭露存在的问题以及提出今后设想。文档可根据实际情况进行修改和使用。 实验题目:草酸中h2c2o4含量的测定 实验目的: 学习naoh标准溶液的配制、标定及有关仪器的使 用; 学习碱式滴定管的使用，练习滴定操作。 实验原理: h2c2o4为有机弱酸，其ka1=5、9×10-2，ka2=6、 4×10-5、常量组分分析时cka1>10-8，cka2>10-8， ka1/ka2<105，可在水溶液中一次性滴定其两步离解的 h+: h2c2o4+2naoh===na2c2o4+2h2o 计量点ph值8、4左右，可用酚酞为指示剂。 naoh标准溶液采用间接配制法获得，以邻苯二甲
酸氢钾标定: -cook -cooh +naoh=== -cook -coona +h2o 此反应计量点ph值9、1左右，同样可用酚酞为指示剂。 实验方法: 一、naoh标准溶液的配制与标定 用台式天平称取naoh1g于100ml烧杯中，加50ml 蒸馏水，搅拌使其溶解。移入500ml试剂瓶中，再加200ml蒸馏水，摇匀。 准确称取0、4~0、5g邻苯二甲酸氢钾三份，分别置于250ml锥形瓶中，加20~30ml蒸馏水溶解，再加1~2滴0、2%酚酞指示剂，用naoh标准溶液滴定至溶液呈微红色，半分钟不褪色即为终点。
化学是一门以实验为基础的学科。化学上的许多理论和定律都是从实验中发现归纳出来的。同时，化学理论的应用、评价也有赖于实验的探索和检验。虽然到了近代乃至现代，化学的飞速进步已经产生了各种新的研究方法，但是，实验方法仍然是化学不可缺少的研究手段。新课程改革将科学探究作为突破口，科学探究不但是一种重要的学习方式，同时也是中学化学课程的重要内容，它对发展学生的科学素养具有不可替代的作用。而化学实验是科学探究的重要形式。 用化学实验的方法学习化学，既符合化学的学科特点也符合学生学习化学的认识特点，是化学教学实施素质教育的基本手段。新课程标准提倡学生独立进行或合作开展化学实验研究。通过化学实验能激发学生的学习兴趣，帮助学生通过使用探究形成化学概念、理解化学基础理论、掌握化学知识和技能，培养学生的科学态度和价值观，帮助学生发展思维能力和训练实验技能，从而达到全面提高学生的科学素养的目的。 一、对新课程标准下的中学化学实验的认识 《普通高中化学课程标准》明确了高中化学课程的基本理念：立足于学生适应现代生活和未来发展的需要，着眼于提高21世纪公民的科学素养，构建“知识与技能”、“过程与方法”、“情感态度与价值观”相融合的高中化学课程目标体系。“知识与技能”即过去的“双基”;“过程与方法”是让学生掌握学习的方法，学会学习;“情感态度与价值观”是人文关怀的 体现。所以新的课程理念的核心是“让学生在知识探索的过程中，在知识、学法、人文等 方面得到发展。”其中第5条特别强调：“通过以化学实验为主的多种探究活动，使学生体 验科学研究的过程，激发学习化学的兴趣，强化科学探究的意识，促进学习方式的转变，培养学生的创新精神和实践能力。”[1]高中化学课程由2个必修模块和6个选修模块组成，其中“化学实验”是作为一个独立的模块有别于以往教材的处理，突出其重要的地位。 教育部2001年颁发的《基础教育课程改革纲要》为化学课程改革指明了方向，根据新的 教学理念及由此产生的新课程标准，对照新旧教材，我们不难发现新课程在实验教学方面有以下几个主要方面的转变： 1、从只注重培养实验操作能力向培养实验思维能力和培养实验操作能力并重转变，改变 以往为“教”设计实验变为“学”设计实验，使实验更好地配合学生的主动学习，打破以往教 师垄断实验方案的设计向教师帮助、指导学生参与实验方案的设计的转变，这就是所谓的化学实验的探究化[2]。改变化学实验“照方抓药”式的现状的关键，是加强化学实验的探 究化设计，这对于更好发挥化学实验的功能，促进学生科学素养主动、全面的发展具有重要的意义。例如：必修1中“验证铁能否与水蒸气反应”的探究实验，教材一方面提供了实 验必要的仪器和药品，让学生来设计实验方案;另一方面又提供了一个实验方案，让学生 参考并尝试利用该方案进行实验，最后让学生小结交流探究活动的收获。这样的实验教学，在指导学生学习设计实验的同时又锻炼了学生进行实验探究的动手能力。 另外，新课标不再硬性划分演示实验和学生实验，而是给教师创造性和学生的主动性提供空间。教师通过实验创设学习情景，为学生提供可观察的化学现象和实验操作，其活动指向是学生自主观察、分析思考、交流讨论、实验研究，不是教师单纯的表演或展示。从这
Lab 5 Experiment of Absorption I. Objectives 1. Unde rstand the configuration of an absorption column 2. Determine the overall volumetric gas phase mass transfer coefficient , K Y α 3. Understand the characteristics of single-film resistance. II. Principles In gas absorption process, a solute component is absorbed by contacting with a liquid phase, in which the component is soluble. In this experiment, water is used to remove ammonia from air. The absorption of NH 3 in water is gas phase controlled. The gas phase coefficient approximately equals to the overall mass-transfer coefficient. Based on this, the overall volumetric mass-transfer coefficient can be evaluated. When the mole fraction of solute in liquid is less than 10%, the equilibrium correlation obeys Henry ’s law. The overall mass-transfer coefficient is ()m Y Y h Y Y G K ??-= 21α (1.26) where, h = height of packed section, m K Y α= overall volumetric gas phase mass transfer coefficient , kmol/m 3﹒h Y = mole ratio of solute to solvent in gas phase; Y 1, inlet value; and Y 2, outlet value ΔY m = logarithm average driving force for gas phase III. Apparatus (1). Ammonia absorption apparatus and the process Figure 1.7 presents a diagram of the gas absorption unit to be employed in this experiment. This unit consists of 3 rotameters, 4 manometers, 2 thermometers, 2 buffer tanks, an effluent gas analyzer and an absorption tower. An air-ammonia mixture is introduced to the bottom of the column and pure water is sprayed from the top of the column. The air flowing upward contacts with water stream flowing downwards, which absorbs ammonia. 26 Fig. 1.7 Gas absorption apparatus 1—packed tower; 2—sprayer; 3—packed section; 4—grid; 5—air blower; 6—by-pass valve; 7—buffer tank;
化学实验报告英文版 Chemical Experiment Report Introduction: In this experiment, the aim was to investigate the effects of different concentrations of a reactant on the rate of a chemical reaction. The reaction between hydrochloric acid (HCl) and sodium thiosulfate (Na2S2O3) was chosen as the model system. The rate of this reaction can be determined by measuring the time taken for the solution to become opaque due to the formation of a precipitate of sulfur. Materials and Methods: 1. Chemicals: - Hydrochloric acid (HCl) - Sodium thiosulfate (Na2S2O3) - Distilled water 2. Apparatus: - Beakers - Stopwatch - Measuring cylinder - Glass rod - Pipette 3. Procedure: 1. Prepare five different solutions of sodium thiosulfate with concentrations
篇一：英文版化学实验报告 Title: Preparation of Fe scrap from waste (NH4) The purpose of the experiment Learn the method used scrap iron preparation of ferrous ammonium sulfate. Familiar with the water bath, filtered, and evaporated under reduced pressure and crystallization basic working. The experimental principle, the iron and sulfuric acid to generate reactive ferrous sulfate, ferrous sulfate and ammonium sulfate in an aqueous solution of equal molar interaction, becomes less soluble blue generate ferrous ammonium sulfate. Fe+H2SO4=FeSO4+H2 (gas) FeSO4+ (NH4)2SO4+6H2O=(NH4) Usually ferrous rocks are easily oxidized in air, but after the formation of relatively stable perfunctory, not to be oxidized. Experiment to use instruments, scales, constant temperature water bath, pumps, basins, cups, 10ml graduated cylinder, asbestos mesh, glass, tripod, alcohol lamp, funnel. Iron pieces to a solid pharmaceutical use, use of acid ammonium sulfate and 3mol / l of sulfuric acid, concentrated sulfuric acid. The experiment was divided into four steps. The first step Said iron powder 4g into a beaker and then 50ml 10ml, 3mol / L H2SO4 was added to the same beaker. The second step will be the beaker is heated to no more bubbles, and then filtered hot and the filtrate was then filled in 100ml beaker. The third step, called 4g (NH4)2SO4, and the resulting ammonium sulfate and of water to form a saturated solution, and then add it to the ferrous sulfate solution, adjusted with concentrated sulfuric acid to PH = 1. A fourth step, the third step the solution was heated in a water bath to the surface until the film is crystallized, it was slowly cooled and
英文实验报告范文 求一篇英文的化学试验报告范文（ Chemistry Lab sample (This is one of my Chemistry 11 lab assignment。) Title: Cooling and Heating Curves of a Pure Substance Objectives: to investigate the cooling process for liquid paradichlorobenzene to investigate the heating process for solid paradichlorobenzene to determine and compare the melting and freezing temperatures of paradichlorobenzene Materials: Apparatus: rin stand and ring support buret clamp bunsen burner; wire gauze with ceramic centre; test tube(18mm*150mm); beaker(400ml); 2 thermometers; lab apron; safety goggles. Reagent: paradichlorobenzene Procedure: It's freaking long for this lab and I can't type them all out. Basically, it is just what you do to complete the lab and
英文版弗兰克赫兹实验报告 Franck-Hertz Experiment Purposes 1. Measure the first excitation potential of argon atom, and prove the existence of atom?s energy level, thereby strengthen the understanding of energy quantization. 2. Learn the microcosmic graphic of the energy exchange which occurs with the collision of electron and atom, and then explore the main physical factors influencing the process. 3. Excise to operate oscilloscope skillfully. Equipment Franck-Hertz experiment instrument, digital oscilloscope. Principle Atom in normal state can neither IA radiate nor absorb energy, which is in a U G2AA stable state called stationary state. The G 2 energy value to which a certain stationary U G2KG 1 state corresponds is energy level. The K U G1K F stationary state corresponding to the
化学性质实验报告 有机实验报告 糖、氨基酸和蛋白质的鉴定 一、糖的鉴定 糖类化合物：又称碳水化合物，是多羟基醛或多羟基酮及其缩聚物和某些衍生物的总称，一般由碳、氢与氧三种元素所组成。 实验目的： （1）进一步了解糖的化学性质；（2）掌握鉴定糖的方法及其原理。 （一）-萘酚试验（molish)糖类化合物一个比较普遍的定性反应是molish反应。即在浓硫酸存在下，糖与-萘酚(molish试剂）作用生成紫色环。 实验方法 取3支试管，编号，分别加入0.5 ml 0.5%的各待测糖水溶液，滴入2滴molish试剂（-萘酚的乙醇溶液），摇匀。把试管倾斜450，沿管壁慢慢加入约1ml浓硫酸（切勿摇 动），小心竖直后仔细观察两层液面交界处的颜色变化。硫酸在下层,试液在上层样品：葡萄糖、蔗糖及淀粉 解释: 糖被浓硫酸脱水生成糠醛或糠醛衍生物，后者进一步与 -萘酚缩合生成紫红色 物质，在糖液和浓硫酸的液面间形成紫色环。 （二） fehling试验 （1）实验原理 fehling试剂：含有硫酸铜和酒石酸钾钠的氢氧化钠溶液。 硫酸铜与碱溶液混合加热，生成黑色的氧化铜沉淀。若同时有还原糖存在，则产生黄色或砖红色的氧化亚铜沉淀。为防止铜离子和碱反应生成氢氧化铜或碱性碳酸铜沉淀，fehling试剂中需加入酒石酸钾钠，它与cu2＋形成的酒石酸钾钠络合铜离子是可溶性的络离子。
（2）操作方法 取4支试管，编号，分别加入fehling试剂i和ii 各0.5ml。摇匀并置于水浴中微热后，分别加入5滴待测糖溶液，振荡后置于沸水浴中加热2 ~ 3min，取出冷却，观察颜色变化及有无沉淀析出。fehling试剂 i：称取3.5 g硫酸铜溶于100 ml蒸馏水中, 得淡蓝色的fehling试剂 i。 fehling试剂ii：将17g酒石酸钾钠溶于20ml热水中，然后加入20 ml含 5 g naoh的水溶液，稀释至100 ml得无色透明的 fehling试剂 ii。 样品：葡萄糖、果糖、蔗糖及麦芽糖 解释: 硫酸铜与碱溶液混合加热，生成黑色的氧化铜沉淀。若同时有还原糖存在，则产生黄色或砖红色的氧化亚铜沉淀。 （三） benedict试验 （1）实验原理：benedict试剂是fehling试剂的改良。benedict 试剂利用柠檬酸作为 cu2+的络合剂。 benedict试剂：取17.3 g柠檬酸钠和10 g 无水碳酸钠溶于80 ml水中，再取1.73 g结晶的硫酸铜溶解在10 ml水中，慢慢将此溶液加入上述溶液，用水稀释至100 ml得 benedict试剂。 （2）操作方法 用benedict试剂代替fehling试剂重复以上实验，取4支试管，编号，分别加入benedict试剂 0.5ml。摇匀并置于水浴中微热后，分别加入5滴待测糖溶液，振荡后置于沸水浴中加热2 ~ 3min，取出冷却，观察颜色变化及有无沉淀析出。 样品：葡萄糖、果糖、蔗糖及麦芽糖 解释: 硫酸铜与碱溶液混合加热，生成黑色的氧化铜沉淀。若同时有还原糖存在，则产 生黄色或砖红色的氧化亚铜沉淀。 （四）成脎试验
化学实验报告英语 Chemical Experiment Report Introduction Chemical experiments play a crucial role in the field of science and technology. They provide valuable insights into the properties and behavior of various substances. In this report, we will discuss a series of chemical experiments that were conducted in a laboratory setting. The experiments aimed to explore the effects of different variables on the reaction rate and product formation. Experiment 1: Reaction Rate and Concentration In this experiment, we investigated the relationship between reaction rate and concentration. We prepared a solution of hydrochloric acid and sodium thiosulfate. By varying the concentration of sodium thiosulfate and keeping the concentration of hydrochloric acid constant, we observed the time taken for the solution to turn cloudy. As expected, we found that a higher concentration of sodium thiosulfate resulted in a faster reaction rate. This experiment demonstrated the importance of concentration in determining the rate of a chemical reaction. Experiment 2: Temperature and Reaction Rate Temperature is another crucial factor that influences reaction rates. To study this, we heated a solution of potassium permanganate and oxalic acid to different temperatures. We then measured the time taken for the solution to change color. The results showed that an increase in temperature led to a significant
Effect of Type of Sugar on Glycolysis and Fermentation in Yeast Introduction: Many cells go through glycolysis and fermentation to break glucose down to carbon dioxide and ethanol (Black et al. 158 and 172). In glycolysis, glucose is converted to pyruvate, and in fermentation, pyruvate is converted to carbon dioxide and ethanol (Black et al. 158 and 172). Glycolysis and fermentation provide these cells, such as yeast, in this experiment, with energy (Peck). However, yeasts do not utilize all kinds of sugar in the same rate. Some sugars can even not be utilized by yeasts (Peck). This experiment aimed to study whether certain types of sugars can be utilized by yeast, if so, what is the different rate that the yeast utilize them. The rate was studied by measuring the rate that the systems produced carbon dioxide, one of final products of fermentation. The sugars being investigated were fructose, galactose, sucrose, maltose, and sactose. Rate that yeast utilized different sugars were compared with the rate that the yeast utilized glucose. The group of yeasts treated with glucose was positive control and that of yeast not treated by any sugar was negative control. In glycolysis, glucose is turned to fructose-6-phosphate, which is the phosphorylated form of glucose (Black et al. 159). Therefore, we expected that yeast would utilize fructose in similar rate as it utilizes glucose. Galactose is a geometric isomer glucose, which is not involved in the process of glycolysis. Hence we hypothesized that galactose cannot be utilized by yeast. Since each disaccharide molecule contains two subunits of monosaccharide monomers, yeast should decompose disaccharides into monosaccharides before going through glycolysis. Therefore, we