Saturday or Sunday post about my Science notebooks (SNS- Science Notebook Saturday). I did my first in my Algebra II class in high school back in the 90’s, and I loved the organization of it all! I have been using notebooks for the past 3 years and I have found that composition notebooks are the best! Now for the interior set up. Hopefully you can go to the dollar tree and get a package of these small manila envelopes (8 for a dollar). Each envelope will be used for 2 kids. Just have the kids lick it closed and cut it in half. Now you have a little pocket perfect to hold homework (folded in half), a protractor, and “THE TEST” formula sheet. Now the students cant say they didn’t have a ruler to do that perimeter homework you assigned. Now just glue it into the inside of the front cover. You can always reinforce with tape if needed. Make a cover page however you want, and then a table of contents (TOC). So it’s worth putting in there. We use the front and the back of each page (I would not have enough pages if I didn’t) We use 5 individual pages for our table of contents. This is the only back page we don’t use. Its the back of the title page. Another thing you could add is an Index to the back of the journal for all the new vocabulary you will teach. I did this in my 1st semester journal but I didn’t keep up with it, and I noticed that the kids would never use it to go back and find their pages. They would use the TOC. It’s up to you. I liked teaching them the “why” we have an index and how to use and make it, but they just didn’t use it often enough.
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This same goes for starch. But since starch has larger component compare to sucrose so it took a longer time to hydrolyse. That the purpose of heat it in longer time compare to sucrose. Without the addition of acid to sucrose solution, starch solution, the test given is negative. The solutions remain clear blue after the addition of Benedict’s reagent and heating. Tap water is used only to show the example of negative result of Benedict’s test. Thus it will not show any changes compare to the carbohydrates. Benedict’s test is the common test which is used to determine the existence of reducing sugar. Fructose, lactose, and glucose are reducing sugars which give positive test. Starch and sucrose are non reducing sugars which give positive results after adding hydrochloric acid. Test tubes, test tube rack , dropper. 1. Few drop of 0.01M iodine in 0.12M KI added to 1% starch and cellulose solutions.
2. Any changes to the colour are observed. Starch gives positive result in Iodine test as the color of solution change from yellow to dark blue. The immediate formation of a vivid blue color indicates amylose. Vivid blue coloration forms due to the polyiodide complex formed. 4)-glycosidic bond. This give cellulose to be a straight polymer therefore, it can’t coil around iodine to produce blue colour as starch does. Only starch gives the color of vivid blue, this is because it contains amylase. The iodine molecules slip inside of the amylase coil. The amylose, or straight chain portion of starch, forms helices where iodine molecules assemble, forming a dark blue color. The Iodine test is used to test for the presence of starch. Starch is a type of polysaccharide carbohydrate which is made up of amylose and amylopectin. It is one of the main sources of carbohydrate and present naturally in plant. Amylose in starch form dark blue complex with iodine. To test the solubility in hot water and digestion by amylase.
Test tubes, test tube holder, glass rod, test tube rack, fume cupboard, 2 centrifuge tubes, analytical balance, cylinder, graduated pipette, pipette filler, 2 evaporator dishes. 10 The weight of the evaporator dishes is measured again. 11 The solubility results are recorded and tabulated. In this activity, the solubility is defined as the percentage ratio of the weight of dried supernatant to the weight of the dry starch. Solubility can be interpreted as the amount of the dissolved compound that is present in the test solution. From the calculations done, we can see that starch, with a percentage of solubility at 0.01860 %, whereas cellulose have 0.002000 %. Starch and cellulose are two very similar polymers. In fact, they are both made from the same monomer, glucose, and have the same glucose-based repeat units. Since the sugar molecules contain the hydroxyl group or -OH, Thus it can form hydrogen bonds with water molecules, which makes it soluble in water, but only to a limited extent. However, the glucose units in starch are connected by alpha linkages while the glucose units in cellulose are connected by beta linkages.