关于英文版化学实验报告

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英文实验报告用词

Abstract:The purpose of this experiment was to investigate the effect of pH on the crystallization of silver nitrate. By varying the pH of the silver nitrate solution, we aimed to observe and analyze the changes in the crystalline structure and growth rate of the silver nitrate crystals. The experiment involved preparing solutions of different pH levels, adding silver nitrate, and observing the crystallization process under controlled conditions. The results were analyzed using microscopic examination and data analysis techniques.Introduction:Silver nitrate, AgNO3, is a chemical compound commonly used in various applications, including photography, medicine, and the synthesis of other compounds. The crystallization of silver nitrate is a process that involves the formation of ordered structures from a disordered liquid state. The pH of the solution can significantly influence the crystallization process, as it affects the solubility and ion concentrations of the silver nitrate. This experiment aimed to explore the impact of pH on the crystallization of silver nitrate and its resulting crystal structure.Materials and Methods:1. Materials:- Silver nitrate (AgNO3) pellets- Distilled water- pH indicator paper- Beakers- Glass stirring rods- Microscopes- Data collection sheets2. Methods:a. Preparation of pH Solutions:- We prepared a series of pH solutions ranging from 2 to 10 using a pH meter and pH buffer solutions.- The pH solutions were mixed thoroughly and allowed toequilibrate before use.b. Preparation of Silver Nitrate Solutions:- We dissolved 0.1 g of silver nitrate in 10 mL of each pHsolution to obtain a 0.01 M silver nitrate solution.- The solutions were stirred for 10 minutes to ensure complete dissolution.c. Crystallization Process:- We transferred 5 mL of each silver nitrate solution into separate beakers.- The solutions were allowed to crystallize undisturbed for 24 hours at room temperature.- During the crystallization process, the solutions were periodically observed for changes in crystal formation.d. Microscopic Examination:- After crystallization, a small amount of each solution was placed on a microscope slide.- The slides were examined under a light microscope to observe the crystal structures and growth patterns.e. Data Analysis:- The observed crystal structures were documented and compared across different pH levels.- The size, shape, and growth rate of the crystals were measured and recorded.Results:1. pH Influence on Crystallization:- At pH 2, the solution exhibited rapid crystallization with the formation of small, needle-like crystals.- As the pH increased to 4, the crystallization rate slowed down, and the crystals became larger and more rounded.- At pH 6, the crystals were large, well-formed, and exhibited a cubic structure.- At pH 8, the crystals were still large but showed a decrease in size and a more irregular shape.- At pH 10, the crystallization process was significantly slower, and the crystals were small, amorphous, and difficult to observe under the microscope.2. Crystal Structure Analysis:- The crystal structures observed under the microscope varied with pH levels.- At pH 2, the crystals had a hexagonal prism shape, indicating a well-defined crystal lattice.- At pH 4, the crystals had a rhombic shape, suggesting a change in crystal lattice.- At pH 6, the crystals were cubic, which is the most common crystal structure for silver nitrate.- At pH 8, the crystals were octahedral, indicating a further change in crystal lattice.- At pH 10, the crystals were amorphous, suggesting a lack of long-range order.Discussion:The results of this experiment demonstrate that the pH of the silver nitrate solution significantly influences the crystallization process and the resulting crystal structure. As the pH increases, the crystallization rate decreases, and the crystal shape and structure change accordingly. This observation is consistent with the understanding that changes in pH alter the solubility and ion concentrations of silver nitrate, thereby affecting the crystallization process.The crystalline structures observed under the microscope were consistent with the literature, with the cubic structure being the most common for silver nitrate at neutral pH. The changes in crystal shape and structure with varying pH levels can be attributed to the different ion concentrations and interactions that occur at different pH conditions.Conclusion:In conclusion, this experiment has shown that the pH of the silver nitrate solution plays a crucial role in the crystallization process and the resulting crystal structure. By varying the pH, we were able to observe the changes in crystal shape, size, and growth rate. This experiment provides valuable insights into the factors that influence the crystallization of silver nitrate and can be useful in controlling the crystallization process for various applications.References:1. Chatterjee, S., & Ray, D. (2013). Crystal growth. New York: Taylor & Francis.2. Barus, R. M. (2006). The chemistry of crystallization. New York: Oxford University Press.3. Basu, A., & Basu, R. (2012). Crystallography. New York: John Wiley & Sons.4. Scherer, G. (2008). Fundamentals of Crystal Growth. New York: Springer Science & Business Media.。

英语演讲化学实验ppt

Chemistry experiment is the basis of chemistry, and chemistry is closely related to our life. We themselves all cannot do without the development of chemistry. So I hope you can change the chemistry of prejudice and love chemistry.
This is the experiment of preparing carbon monoxide. Although there are some mistakes, but overall more successful.
This is a reducing sugar experiment by Fehling reagent test.
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Chemical experiment
As a basic discipline, the development of chemistry is based on the experiment. Since ancient times, European alchemists and Chinese alchemists have begun to conduct chemical experiments For thousands of years, chemical experiments have made countless people fall in love with chemistry . Therefore, let us enjoy the beauty of chemical experiments

英语作文,实验报告[5篇材料]

英语作文,实验报告[5篇材料]第一篇：英语作文,实验报告请根据下列内容，写一篇短文，说明整个实验的内容。

实验目的：不打烂鸡蛋取走蛋壳实验器材：一个玻璃杯，一个小锅，水，一个鸡蛋，醋(vinegar)约250毫升实验步骤：1.把鸡蛋放在锅中煮十五分钟左右；2.把煮熟的鸡蛋放到玻璃杯中；3.往玻璃杯中倒醋，醋要漫过鸡蛋；4.让鸡蛋仔醋中浸泡24小时。

实验结果：24小时后，鸡蛋壳完全消失。

实验结论：醋中的酸性物质(acid)与蛋壳中的碳酸钙(calcium carbonate)反应生成二氧化碳(carbon dioxide)，蛋壳(shell)消失。

注意：词数：100—120。

写作指导：文章体裁是_______,因此时态可以是_______,全文可以这样分段：内容及要点信息常用句型及词汇：实验目的：the aim of the experiment is to…;in order to find out…;we carry out an experiment to…;with the purpose of…;in the hope of实验器材：you need…;the following things are neededwill be used实验步骤或方法：cookboil,fill…in,weigh,wait,place,react反应,form；first,first of all,next,second,after that,finally, in the end,at last, for 15minutes,24hours later…实验结论：from this we can conclude…we can learn from the experiment…we can find out that…the result is…you can seediscover…连词成句，再用上恰当的过渡词连句成篇：1.这个实验的目的是取走蛋壳而不打烂鸡蛋。

英文实验报告格式范文

英文实验报告格式范文英文实验报告格式范文Title: The Effect of Temperature on Enzyme ActivityAbstract:The purpose of this experiment was to determine how temperature affects the activity of the enzyme amylase. Three different temperatures were tested: 10°C, 25°C, and 45°C. The results showed that the rate of reaction increased as the temperature increased up to 45°C. However, at temperatures above 45°C, the rate of reaction began to decrease due to denaturation of the enzyme. The optimal temperature for amylase activity was found to be 45°C. These findings have important implications for the use of enzymes in industrial processes. Introduction:Enzymes are biological catalysts that speed up chemical reactions without being consumed in the process. They are essential for life and are used in a wide range of industrial processes. Enzyme activity is affected by a number of factors, including temperature, pH, and substrate concentration. Temperature is one of the most important factors affecting enzyme activity. Enzymes have an optimal temperature at which they work most efficiently. At temperatures above or below thisoptimal temperature, the rate of reaction decreases. At very high temperatures, enzymes can become denatured and lose their ability to function.Materials and Methods:The experiment was performed using a solution of amylase enzyme and starch. Three test tubes were prepared, each containing 5 mL of the enzyme solution and 1 mL of starch solution. The test tubes were then heated to three different temperatures: 10°C, 25°C, and 45°C. The temperature was controlled using a water bath. A control test tube was also prepared, containing the same amount of enzyme and starch, but no temperature was applied. The reaction was allowed to proceed for 10 minutes, after which the test tubes were removed from the water bath and the absorbance of each solution was measured using a spectrophotometer.Results:The results showed that the rate of reaction increased as the temperature increased up to 45°C. At 10°C, the rate of reaction was very slow, with an absorbance reading of 0.010. At 25°C, the rate of reaction was faster, with an absorbance reading of 0.035. At 45°C, the rate of reaction was the fastest, with an absorbance reading of 0.080. However, at temperaturesabove 45°C, the rate of reaction began to decrease due to denaturation of the enzyme. The control test tube had an absorbance reading of 0.005, indicating that no reaction had taken place.Discussion:The results of this experiment demonstrate that temperature has a significant effect on the activity of the enzyme amylase. The optimal temperature for amylase activity was found to be 45°C. At temperatures above this, the enzyme began to denature and lose its activity. These findings have important implications for the use of enzymes in industrial processes. Industries that use enzymes must carefully control the temperature of their processes to ensure that the enzymes work efficiently.Conclusion:This experiment has shown that temperature has a significant effect on the activity of the enzyme amylase. The optimal temperature for amylase activity was found to be 45°C. These findings have important implications for the use of enzymes in industrial processes, where temperature control is crucial for ensuring efficient enzyme activity.。

英文实验报告作文

英文实验报告作文Experiment Report。

The experiment was a total disaster. Nothing went according to plan. The chemicals spilled everywhere, the equipment malfunctioned, and the results were completely unexpected. It was a complete mess from start to finish.I couldn't believe how poorly everything turned out. I had spent weeks preparing for this experiment, and it all fell apart in a matter of minutes. It was frustrating and disappointing, to say the least. I had high hopes for this project, but it was a total bust.Despite the failure of the experiment, I learned a valuable lesson. I learned that not everything in science goes as planned, and sometimes you have to be prepared for the unexpected. It was a humbling experience that taught me the importance of perseverance and adaptability in the face of challenges.Moving forward, I will take this experience as a learning opportunity. I will use it to improve my skills and become a better scientist. I will be more cautious in my preparations, double-check my equipment, and be ready to pivot if things don't go as expected. This experiment may have been a failure, but it will not define me as a scientist.In conclusion, the experiment was a disaster, but it was also a valuable learning experience. It taught me important lessons about resilience, adaptability, and the unpredictable nature of science. Despite the setbacks, I am determined to continue pursuing my passion for research and discovery. Failure is just a stepping stone on the path to success.。

英文实验报告

英文实验报告Experimental ReportTitle: The Effects of Temperature on the Growth of Tomato Plants Introduction:This experiment aims to investigate the effects of temperature on the growth of tomato plants. Tomatoes are one of the most widely cultivated crops, and their yield is influenced by various environmental factors, including temperature. Understanding the impact of temperature on tomato plant growth is essential for optimizing their cultivation conditions.Materials and Methods:1. Tomato seeds: Variety X2. Planting pots: 10 cm in diameter3. Potting soil4. Thermometer5. Light source6. Watering can7. Experimental chambers set to different temperatures: 15°C, 20°C, 25°C, 30°C, and 35°C.8. Measuring tapeProcedure:1. Plant tomato seeds in the planting pots filled with potting soil.2. Water the pots regularly to keep the soil moist.3. Place the pots in the experimental chambers set to the different temperature conditions.4. Ensure that each temperature condition has an equal number ofpots.5. Maintain a light source to provide consistent illumination throughout the experiment.6. Measure the height of the tomato plants every seven days using the measuring tape.7. Record the growth data for each temperature condition over a four-week period.Results:The following table presents the average plant height (cm) for each temperature condition:Temperature (°C) | Week 1 | Week 2 | Week 3 | Week 4----------------------------------------------------15 | 3.5 | 7.2 | 12.1 | 18.420 | 4.1 | 8.7 | 14.5 | 22.025 | 4.7 | 9.3 | 16.3 | 25.630 | 3.9 | 7.8 | 13.6 | 20.135 | 2.8 | 5.6 | 10.4 | 16.2Discussion:Based on the results, it is evident that temperature significantly affects the growth of tomato plants. Optimum growth was observed at a temperature of 25°C, where the plants had the highest average height throughout the four-week period. At lower temperatures (15°C and 20°C), the growth rate was slower, while at higher temperatures (30°C and 35°C), the growth rate decreased significantly. This indicates that extreme temperatures can negatively impact tomato plant growth.Conclusion:The experiment confirms that temperature plays a crucial role in the growth of tomato plants. The optimal temperature for tomato plant growth was found to be 25°C, whereas lower and higher temperatures resulted in reduced growth. These findings highlight the importance of maintaining suitable temperature conditions for maximizing tomato crop yields in agricultural practices.。

重结晶英文实验报告

Objective:The objective of this experiment was to purify a compound through the process of recrystallization, which involves dissolving a solid in a suitable solvent, allowing it to slowly crystallize out, and then isolating the pure crystals.Materials:- Impure solid compound- Solvent (selected based on solubility in hot and cold conditions)- Beaker- Stirring rod- Filter paper- Buchner funnel- Desiccator- Analytical balance- Heat source (e.g., hot plate)- ThermometerProcedure:1. Solvent Selection:- A suitable solvent was chosen based on the solubility of the compound in hot and cold conditions. The compound should be highly soluble in the solvent at high temperatures but sparingly soluble at room temperature.2. Dissolution:- The impure solid compound was weighed accurately using an analytical balance.- The compound was added to a beaker containing a sufficient amount of the hot solvent. The beaker was placed on a heat source, and the mixture was stirred continuously until the compound completely dissolved.3. Cooling:- The hot solution was then allowed to cool slowly to room temperature. This could be achieved by placing the beaker in an ice bath or simply allowing it to sit undisturbed. It is crucial to cool the solution slowly to promote the formation of large, well-defined crystals.4. Crystallization:- Once the solution had cooled to room temperature, it was observed for the formation of crystals. The crystals began to form as the solubility of the compound decreased with temperature.5. Filtering:- The solution was then filtered through a Buchner funnel lined with filter paper to remove any remaining impurities and undissolved solid particles. The filter paper was washed with a small amount of the cold solvent to ensure that all the crystals were collected.6. Drying:- The collected crystals were transferred to a desiccator to remove any remaining solvent. The desiccator was left open for a sufficient amount of time to allow the crystals to dry completely.7. Analysis:- The purity of the crystals was analyzed using melting point determination. The melting point of the recrystallized compound was compared to the literature value to assess the purity.Results:- Solubility Data:- Solubility in hot solvent: [insert solubility value]- Solubility in cold solvent: [insert solubility value]- Crystallization Time:- Time taken for crystallization: [insert time value]- Purity Assessment:- Melting point of the recrystallized compound: [insert melting point value]- Literature melting point: [insert literature melting point value]- Conclusion regarding purity: [insert conclusion based on the comparison of melting points]Discussion:The recrystallization process was successful in purifying the compound, as evidenced by the higher melting point of the recrystallized crystals compared to the impure sample. The choice of solvent was critical in ensuring that the compound was highly soluble at high temperatures but sparingly soluble at room temperature. The slow cooling of the solution was also essential for the formation of large, well-defined crystals. The purity of the final product was confirmed by the melting point analysis, which indicated a high level of purity.Conclusion:This experiment demonstrated the effectiveness of the recrystallization process in purifying a solid compound. The careful selection of a suitable solvent and the control of cooling conditions are crucial factors in achieving a high-purity final product. The knowledge gained from this experiment will be valuable in future synthetic and purification processes.。

化学性质实验报告

糖、氨基酸和蛋白质的鉴定糖类化合物：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 ml %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。

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 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。

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篇一：英文版化学实验报告Title: Preparation of Fe scrap from waste(NH4)The purpose of the experimentLearn 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 50ml10ml, 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 resultingammonium 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 andthen filtered under reduced pressure to stand finally dried, weighed and the yield was calculated. The results obtained bluish powderycrystals. Have this result we can calculate yield, starting with the first step we tried to know the amount of iron, should this wecan calculate the theoretical sulfate ferrous sulfate is , thenferrous sulfate obtained by thetheoretical value of ammonium. FeSO4+（NH4）2SO4+6H2O=FeSO4.(NH4) molX=m=XM=ⅹ392g/mol=Yield = the actual value of the formula is divided by the theoretical value by 100%.it will be calculated into the dataobtained in a yield of %.篇二：英文版化学实验报告The preparation of alkali type copper carbonateThe first:the experiment purposethe methods of alkali type copper carbonate prepared andprinciplethe design experiment to cultivate independent design abilityand chemical research thinkingThe second:the experimental principleThe solubility of Cu(OH)2and CuCO3 are similar, With Cu2(OH)2CO3 solid precipitation in the solution.2CuSO4+2Na2CO3+H2O==Cu2(OH)2CO3↓+2Na2SO4+CO2↑The third:the experimental stepspreparationDisposes mole of each litre acid sour coppers and sodiumcarbonate solution each 100 milliliters.feeding order and raw material compare the explorationAccording to 2:,2:2,2:,2: 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.explorationAccording 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.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 itemsInstrument and material: The balance, the beaker, the glass rod, the Volumetric flask, the test tube, the filter flask,the Buchner funnel, the Erlenmeyer flaskChemicals: Copper carbonate, sodium sulfateThe fifth:the experimental resultthe step 2, the observation phenomenon optimum condition is equal to for the cupric sulfate compared to the sodium carbonate 2:, the feeding order for joins the sulfuric acid copper solutions to the sodium carbonate solution in.the step 3, the observation phenomenon optimum temperature is 75 degrees Celsiusto the copper sulfate solution than sodium carbonatesolution 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+CO2↑2 1* X2/(*)=1/XX=M[Cu2(OH)2CO3]=*222=Productive rate:/*100%=45%The sixth : Questions1. Which cupric salt suit the system to take the cupric basic carbonate? Answer:Cu(NO)3 or CuSO42. 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 determinationone, the experimental goal1、 the study silver nitrate standard solution configuration and the demarcation method2、 the grasping law raises Si Fa to determine the chloride ion the method principle two, the experimental principleWith AgNO3 standard solution titration Cl - Ag + + Cl - = = AgCl，At ph - 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 reagentsEquipment 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 stepsAccurately moving 25 ml co ncentration is 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 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 nitratestandard solution titration to solution from yellow to pink is the end point. Record the consumption volume of silver nitratestandard solution, parallel determination of 3, calculate the sodium chloride content in saline and relative mean deviation.Fifth, data recording and processingFormula: ρ = V×MrNaCl×CAgNO3 x 100The average deviation d= dr=d/ρ×100%=%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）；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。