It binds with starch so the more starch, the darker the solution was. We also used a blank solution with no starch to set the spectrometer to zero. The spectrometer was used to compare the absorbency of the starch in the control solutions and the non-control solutions over time. Amylase was the last solution added to start the initial breakdown of the starch. Adding it at one minute intervals allowed the students to see how much starch the amylase was actually breaking down over time.
Graphically, it would appear that Styrofoam is the best calorimeter because it remains steady throughout the trial, but this does not connect with the calculated calorimeter constants. Based on the calculations, the next best insulator after cloth towels is aluminum foil, and then paper towels. On the contrary, it would make more sense if Styrofoam was the next best insulator after the cloth towels based of the graphs. Conclusion: In conclusion, the purpose of the experiment was to determine which of several common substances are the best thermal insulating materials. From the data collected, it is observed that the best cup calorimeter out of all the given materials is ceramic.
This is the equation of the reaction. (Clear) (Clear) (Soluble) (Gas) (Yellow precipitate) (Clear) (Clear) (Soluble) (Gas) (Yellow precipitate) Sodium thiosulphate + hydrochloric acid → sodium chloride+ sulphur dioxide + water + sulphur This makes the solution go cloudy This makes the solution go cloudy Na₂S₂O₃ + 2HCl → 2NaCl + SO₂ + H₂O + S Variables There are different things that we had to control during the experiment to ensure the results were reliable, we had to keep the temperature the same, although this was not 100% accurate because we did it at room temperature and we doubt that this would have changed within the 30 minute experiment time. The X that we were looking at during the experiment had to be the same X on the same piece of paper to eliminate any changes of the X, we also had to make sure the distance we kept between the piece of paper and the person who was looking the same, we did this by leaning our arms on the table and looking vertically down without bending our backs at all. We thought it was best to use the same person so the visual ability to see the X
I do not need to do an experiment on them to know that chemicals are not safe for children. The experiment that I have chosen to do is make a lava lamp in a water bottle. The items needed are water, salt, oil, a bottle, and food coloring. My observation is that oil and water will not mix and that the food coloring will sink and mix with the water. The question that I have posed is:
Yes because a substances density is specific and it can be used to tell one object from another but not on a very accurate scale. Conclusion: 1. Results of main object: 2: Secondary objectives and or trends: • Pipet used to transfer small amounts of water • Balance is used to measure the mass • Graduated cylinder is used to measure the volume of the water The surface looked like it had double dipped when it was in the graduated cylinder. 2. Possible experimental errors: a) Putting a little too much water into the graduated cylinder.
For the food test that use to determine the of presence protein we use Biuret test instead of Million’s Test. The reason why we are choosing the Biuret test is because the Millon’s Test cannot have positive result on specific protein such as gelatine due to the gelatin had no tyrosine beside the Million’s Test will show positive result on every substance which had the tyrosine including non protein substance. So we used albumin solution and it will only show positive result on protein only. Objective -To determine the presence of reducing sugar by carrying of Benedict’s test -To determine the presence of non reducing sugar by carrying out Hydrolysis process by using dilute hydrochloric acid. -To show the presence of starch by carrying out iodine test.
For both the Human Amylase and Fungal Amylase the results yielded somewhat similar outcomes. At zero degrees Celsius there was some starch present. The same applied for the test tubes in the forty degrees Celsius. The test tubes in the sixty degrees Celsius no starch formation was present. And at ninety five degrees Celsius, all of the starch was present.
Body: I. Main Point: Water fluoridation A. Simply put, water fluoridation is the practice of adding chemicals to drinking water in an attempt to raise the naturally occurring fluoride ion to about 1mg per liter in the belief that this will reduce the occurrence of dental problems such as tooth decay. i. originally the practice used sodium fluoride water fluoridation is now accomplished through the use of silicofluorides. This crude product is an approximately 25% solution of hydrofluosilicic acid and a highly toxic hazardous waste of the phosphate fertilizer industry.
We can determine which of these emulsions is a mixture of tiny droplets of oil in water, or tiny droplets of water in oil using fat-soluble and water-soluble dyes. Food coloring is a water-soluble dye and so will stain the components in a sample that are made up of mostly water. Food coloring does not easily stain fats. You should observe either tiny clear bubbles within a colored matrix, or tiny colored bubbles within an unstained matrix. A vinaigrette salad dressing is the oil in water (or vinegar) variety, along with milk and mayonnaise.
This wide melting range also indicated impurities. Discussion: The procedure used to isolate the caffeine from a tea bag is very particular. The first step is to submerge the tea bag in hot water, much like when making tea to drink. This separates the soluble fraction from the insoluble cellulose, non-hydrolyzable, and tannins. This step is slightly different from brewing tea because only 10 mL of water is used.