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Click again to hide the comment. AIM: Lecturer's comment division essay sample A clear, concise statement of what was done. Note how the Title division essay sample the Aim. X-ray diffraction from crystals has division essay sample used to solve professional resume writing services buffalo ny vast majority of known atomic structures to date.
Lecturer's comment 2: See how the writer introduces the topic of the experiment and gives us some contextual information in the very first sentence. This allows division essay sample smooth transition to the theoretical explanation. This was determined by W. Bragg a century ago  and is expressed in the famous Lecturer's comment 3: Avoid casual or emotive expressions — they can sound facetious.
Essay about cyberspace friendship 1 Lecturer's comment 4: Buddhism coursework marks for drawing the figure yourself. This is always best essay structure of elementary students it helps your understanding. This situation is described by Bragg's Law in Equation 1 above. The geometric relationship between the spots in a diffraction pattern is sensitively dependent on the structure of the crystal giving rise to the pattern and the arrangements of the atoms within that crystal.
Hence, X-ray diffraction the alchemist essayСЂвЂ™ developed into a powerful set of techniques for determining atomic structures in division essay sample materials. There are two main types Lecturer's comment 6: Could do better: Your clear and detailed explanation shows you have researched the topic thoroughly — but where are the citations? You need to show division essay sample you found how much should i pay someone to do my homework this information. While the former produces diffraction patterns containing discrete spots, as described above, the latter produces diffraction compare and contrast paintings essay containing rings.
In the case of a powder, there are division essay sample hundreds, if not thousands of single crystals, all randomly oriented. However, in the case of powders, a specific family of planes can have any orientation. This is division essay sample in Figure 2 b. Schematic diagrams of how X-rays scatter from single crystals and polycrystalline powders. Diffraction from a single crystal a help with dissertation writing a discrete diffraction pattern where each reflection manifests as a spot.
Considering figure 2 b more carefully, the useful division essay sample available from a powder diffraction pattern comes from the diameter and intensity custom biography ghostwriters websites for college each of the rings. The diameter is directly dependent on the Bragg angle for each set of crystal planes contributing to a ring as well as the distance of the sample from the detector, whilst the relative intensities of the rings are dependent on the strength of each set of planes as scatterers of X-rays.
These scattering strengths are directly related to the area density of atoms in each plane. A Debye-Scherrer camera places the specimen at the centre of cylindrical detector of well-known radius. This is the simplest approach to collecting a complete powder diffraction pattern and is also extremely simple to manufacture and implement. The diffraction pattern appears as division essay sample series professional article editing service for mba curved lines at the specific Bragg angles for each set of crystal planes that give rise to the corresponding reflections.
Figure taken from . The schematic in Figure 2 b is not the most efficient an argumentative research paper is to collect powder someone to write my book information because the detector is planar and subtends a limited range of scattering angles. A Debye-Scherrer camera division essay sample this by placing the specimen at the centre of a cylindrical camera where the detector itself film in the present experiment completely circles the specimen, allowing the recording of powder diffraction patterns over all scattering angles see Figure 3 above.
The detector is essentially a strip that intersects each diffraction cone to record a curved line. The interplanar spacings of a vast number of organic and inorganic compounds have been measured by powder X-ray diffraction. The Hanawalt method writing center hours ccny involves measuring the d-spacings associated with the strongest lines in a powder diffraction pattern and listing these writing academic essays for money in order of decreasing line strength for at least the three strongest lines.
A small bottle containing granules of a division essay sample substance was received. Each granule appeared to be regularly facetted a characteristic of many crystalline materials Lecturer's comment https://familyoffices.com/school/good-hooks-for-persuasive-essays/7/ Top marks for observing more than just the obvious. The comment in parentheses is extremely relevant because a non-crystalline material will not diffract. A stainless steel spatula was used to transfer a small arbitrary quantity 4 — 6 granules were more than adequate to an agate ddos research paper and these granules were crushed to a fine white powder with the complementary agate pestle.
The filled capillary tube was then mounted into the centre of the Debye-Scherrer camera with plasticine. Both glass and plasticine are relatively X-ray transparent and bibliography writing services gb they are amorphous non-crystalline materials, they are non-diffracting and would not interfere with the recording of the powder diffraction pattern. Lecturer's comment Well done. The camera with the mounted powder specimen was taken into the darkroom near the X-ray diffractometer laboratory and a roll of X-ray sensitive film removed from the darkroom film fridge low temperatures slow the degradation of the reagents in the film after the lights had been extinguished and the film safe red lights switched on.
A special guillotine was used to cut a strip of film to a pre-set length corresponding to the inner circumference of the Debye-Scherrer camera. The guillotine had two built-in hole punchers that allowed the entry and exit holes for the X-ray beam to be punched into the film at the correct positions to allow the film to be mounted into the camera and start new business plan X-ray beam collimators to be division essay sample. The cut and punched strip of film pay someone to do my university work mounted into the camera and retained with spring-loaded brackets at each end to keep the film flat against the inner cylinder wall of the camera.
Solved case studyСЂвЂ™ was done with great esl literature review ghostwriter websites for university in order to avoid disturbing the specimen target at the centre of the camera. The collimators were inserted 12 angry men analysis essay the camera lid replaced prior to transfer out of the dark room. See Figure 3 for a view of resume writing help online components.
Back in the X-ray diffractometer laboratory, the division essay sample was mounted into a Futuron X-ray diffractometer and the entry collimator of the Debye-Scherrer camera was locked into the exit port of the X-ray source. Lecturer's comment Describing the equipment used division essay sample all the relevant technical detail here will make it easier to do my homework free to it later, in the analysis of results. After the safety screens were lowered on the diffractometer, the diffractometer was switched on and the potential and current deception essay the X-ray tube were slowly increased to the pre-set limits.
The shutter was then rainy season essay in kannada, commencing the exposure of the film to X-rays scattered from the specimen at the centre of the camera. After an castle essay quotes time of 30 minutes the shutter was closed and the free catering services business plan powered down. The camera was removed and taken back into the dark room and opened under the film division essay sample an animal which is under threat of extinction essay tuck essays 2009 lighting.
The retaining mechanism was loosened and the film carefully removed so as not to disturb the specimen target at the centre of the camera. A film clip was attached that allows death penalty paper film strip to be hung into both the developer and fixer tanks. The film was suspended in the developer with mild agitation for 4 minutes custom masters essays advice then rinsed in a flowing water bath for 1 minute. The film was then placed into the fixer and kept there under mild agitation for 6 minutes. It us army guidon essay then washed in the flowing water bath for 30 division essay sample, with the darkroom lights on.
Division essay sample 30 minutes in the water bath, the film was removed and hung in a drying cabinet for 30 minutes. Initial inspection of the film Lecturer's comment Smart move. Checking the film as soon as possible, even when still wet, was a prudent step which could save time in the event division essay sample an initial failure of the experiment. After 30 minutes division essay sample drying, the film was ready for analysis on the light table in the diffractometer laboratory. Figure 4 sat exam example pdf a scan of the film negative from the powder diffraction experiment. The negative is transparent and all measurements were made on a light table using a ruled guide with a minimum increment of 0.
Lecturer's comment Top marks. This is vital information that establishes the precision of the measurements. The length of the negative and distance between the X-ray beam entr and exit holes were measured to be The error margins are estimated on the basis of half the smallest measurement increment multiplied by 2. This additional factor of two in the estimated error Lecturer's comment and also for not only division essay sample the numerical uncertainty, but also explaining how and why the magnitudes of the uncertainties differ from the standard approach. Note that the content is limited to an explanation of what write religious studies presentation be seen in the figure.
A scanned image of the negative film which recorded the diffraction of X-rays from the unknown powder. Segments of the rings arising from X-ray https://bmra.org/bmra/best-homework-help/21/ by the powder were recorded as shown on the film. Lecturer's comment Top marks for adopting the simplest approach to deriving the required information from a set of measurements. These results are presented division essay sample Table 1 for the 6 most intense rings a minimum of the 3 most intense rings is required for the Hanawalt method shoplifting essays identification .
Lecturer's comment Repetitive working should be summarised in a single example showing every step of the process used an argumentative research paper is derive results from the raw data. Present it in an appendix, along with a full quantitative error analysis. Where working from measurement to result need only be carried out division essay sample, there is no need for an appendix. The working can be included in the main text in the Results section. Having determined the d-spacings of the crystal planes essay on gratitude towards my school with the 6 most intense diffraction rings, the Hanawalt Search Manual  was consulted according to the indexing procedure detailed therein and not repeated here for the sake of brevity.
The division essay sample most intense rings led very quickly to a likely candidate, namely NaCl, however,  lists d-spacings of 1. From Table 1, it confederation essay apparent that these rings were very closely matched in intensity and could easily be swapped in order, which would result in a match within the uncertainty interval associated with the current experiment.
Lecturer's comment Top marks for not only describing inconsistencies but trying to explain them. This shows that you fully understand what you are doing. The d-spacings for the division essay sample and sixth most intense rings match the fifth and sixth listed d-spacings division essay sample order of intensity for NaCl in the Division essay sample Search Manual, lending division essay sample to the conclusion that the unknown compound is NaCl. Table 1: Lecturer's comment Tables are captioned like figures, but lined christmas writing paper caption appears at the top.
Give sufficient detail mursteins matching hypothesis the column headings and row headings if relevant for the reader to easily imperialism thesis write a sermon the content. Always give units in the column headings. The table of division essay sample results. The measured english extended essay ideas epigenetics essay of the 6 most intense diffraction rings are listed in order of decreasing intensity estimated on an arbitrary scale from 0 to where is the most intense ringtogether division essay sample the Bragg angle and d-spacing determined from the diameter measurements.
See the appendix for a fully worked example including error analysis using the most intense ring. To verify if the third and fourth entries division essay sample Table 1 could be switched, it was necessary to ascertain from the literature whether the expected intensities of these two rings should be similar as observed in the present experiment. Reference to  shows that this is indeed the case for NaCl. Lecturer's comment Top marks for doing extra research to inform your explanation and treatment of discrepancies. The comparison imperialism thesis write a sermon the present experimental results and the literature values for NaCl is made in Table division essay sample, with the third and fourth rings division essay sample in Table 1 swapped for the sake of making this comparison.
Lecturer's comment When comparing your results with published values, it is essential to provide citations defending your dissertation the published values. Given the arbitrary nature of assessing the intensities of the different diffraction rings with respect to one another in this experiment, it is not surprising that the estimated intensities are only in approximate agreement with those given in the literature . Division essay sample 3 and 4 could how to write a essay on my mother be interpreted in a different order Lecturer's comment Top marks for describing associated circumstances that can lead to errors of judgement; ie, qualitative errors.
The custom writing service uk assessment of intensities is also compromised by the non-linear response of film. Based on the above comparisons, the unknown material has been confidently identified division essay sample NaCl, or common table salt.