I know of people getting caught out after paying someone from an online site for an assignment. When I worked tutoring we made a practice of checking photo ids for exams as a group of overseas students had decided that identity substitution was profitable. I don’t use identity substitution for exams as it is too costly. Maybe in a subject im struggling in i will think about it. And there were of course the ones we had no proof of where a student who couldn’t string three words of English together in a tutorial would hand in a perfectly worded essay. Unimelb system requires you to submit assignments online not by hand. Luckily the sub contracting wasn’t often of a very high quality as far as the subject matter was concerned-we tried to set topics where students who had actually attended tutorials would have a distinct advantage in getting a decent mark.
I always make sure it is high quality; how do you think i get close to full marks every time? And i attend every tutorials but yet to see any assignments that give advantage to those that go. And of course if they were actually doing the course that year, then plagiarism detection comes into play. I have a student copy of turnitin. It’s too bad exams are typically weighted around the 70% mark. All my other subjects so far are 60%. I can hire people to take the exam for me for chemistry but i like to have some imperfections in my report card not just all H1s. And if you are getting really high marks for assignments; you only need 70% in the exam for a H1. Also none of my breadth subjects have exams; they are all assignment/essay based. So that is ¼ of all my subjects automatically a H1 without me putting one second of effort into it. I can concentrate on only the 3 other subjects now. Nice troll attempt but Victoria has common external exams in year 12. It’s not a joke system like up far north where they don’t have any such exams. Anyway i am going to pay someone to sit my GAMSAT for me so i can get into medicine after my undergrad. It is expensive but well worth it.
Fructose, glucose and lactose show positive result in this test. All monosaccharides are reducing sugars. Many disaccharides, like lactose, also have a reducing form, as one of the two units may have an open-chain form with an aldehyde group. However, sucrose, in which the anomeric carbons of the two units are linked together, are non-reducing disaccharides since neither of the rings is capable of opening. Polysaccharides (sugars with multiple chemical rings) are non-reducing sugars. So, starch and cellulose which are polysaccharides have negative result in Fehling’s test. Distilled water is not reducing sugar also shows negative result. Fehling test is the common test which is used to determine the presence of reducing sugar. Fructose, lactose and glucose are reducing sugars which give brick red precipitate after the solutions are heated. 1. 5 ml of Benedict’s reagent and 2 ml of carbohydrate are added to a test tube and each tube is shook thoroughly.
2. All the tubes are placed in a boiling water bath at the same time. The solutions are heated for 5-6 min. 3. Any changes in color, in the transparencies and in the formation and color of any precipitate are observed and recorded. 4. Later, 4 drops of 3M HCl are added to 5 ml of 1 % sucrose solution and is heated in the boiling water bath for 5 min. 5. 1 % starch solution is treated in the same way but the heating period was extended to 25-30 min. 6. 1-2 ml of each of solution is applied with Benedict’s test in the same manner as before. 7. The results are compared with those obtained without acid treatment. The Benedict’s test is used to detect the presence of reducing sugars (sugars with a free aldehyde or ketone group) such as glucose, fructose and lactose. All monosaccharides are reducing sugars; they all have a free reactive carbonyl group.
Some disaccharides have exposed carbonyl groups and are also reducing sugars. Lactose which is disaccharides also called reducing sugar as it has the exposed carbonyl groups. Other disaccharides such as sucrose and starch are non-reducing sugars and will not react with Benedict’s solution. Benedict’s reagent is a mild oxidant with CuSO4, Cu (II) sulfate, as one of the reagents. 1 oxide,Cu2O. If there a small or large amount of the reducing sugar present, the color would range from green to brick red respectively. 2H2O Sucrose indirectly produces a positive result with Benedict’s reagent if heated with dilute hydrochloric acid prior to the test, although after this treatment it is no longer sucrose. The addition of HCl hydrolysed the non-reducing sugar, as it split it up into its component monomers. The monomers are reducing sugars which gave the positive result on the second reducing sugar test. The acidic conditions and heat break the glycosidic bond in sucrose through hydrolysis. The products of sucrose decomposition are glucose and fructose, both of which can be detected by Benedict’s reagent, as described above.