Top-Rated Free Essay

Protein and Initial Chemical Test

Good Essays
Summer Mitchell 10/04/13
Analysis and Conclusion
1. Why was the water tested for each of the initial chemical tests?
The water was tested for each initial chemical test because it served as the controlled variable. Since water is pure oxygen and hydrogen unlike Glucose and Starch, one variable may be observed.
2. Biuret reagent will turn your skin brownish-purple. Explain why this occurs.
Biuret reagent will turn your skin a brownish-purple because Iodine detects protein in a substance by changing the color to a brown or purple shade, and since your skin contains protein it will also change color.
3. When greasy food is spilled on clothing, why is it difficult to clean with water alone?
Water cannot remove grease water is polar and grease is non-polar. They are immiscible. So when they are mixed they stay separate. But when soap or detergent is applied to the grease stain with water, the substances are allowed to mix. In more scientific terms soap molecules have ionic “heads” that dissolve in water and non polar “tails” that dissolve in grease.
4. Which food substances contain lipids? Are these results expected or not? Explain.
The eggs and chicken contained lipids. These results were expected because chicken is meat, and all meats contain lipids, and the eggs contain it also because the chickens lay them.
5. Which food substances contain simple sugars? Are these results expected or not? Explain.
The 7up and yogurt contain simple sugars. These results were expected because sugar is added to these artificial flavors are added to these substances to give them a better taste.
6. Which food substances contained starch? Are these results expected? Explain.
The potato contained starch. This was expected because I know a medium sized potato can contain up to 30 grams of carbohydrates.
7. Which substances contained protein? Are these results expected or not? Explain.
The chicken and the eggs contained protein. This was expected because proteins are found in meats and I know egg whites contain protein while the yolk contains lipids.
8. What organic molecule did we not test that is important (maybe the most important) to life? Why do you think this is the case? Give an example of how this organic molecule test can be used in a court of law.
We did not test Nucleic acids. It is one of the most important molecules because it is the building blocks of all organisms. Without nucleic acids there’d be no DNA and DNA sends messages and information for your cells to function. RNA is also made of nucleic acids. RNA is what copies the information from DNA and takes it to ribosomes. RNA is extremely important to the cell because it carries genetic information. RNA is responsible for the making of many vital proteins. The cell cannot live without RNA.
9. In a paragraph, describe what you learned from this lab. How might testing like this be applied in the real world? How does this relate to what we have been studying in class?
I learned from this lab that there are three solutions called Benedict, Biuret, and Iodine that indicate if a substance contains simple sugars, protein, and starch, and that very food contains them. I also learned that why water alone cannot remove oil because of the opposite bonds, polar and non-polar. These concepts are applied to the world when scientist wants to find out what a substance contains. This relates to what we are studying in class because with these solutions and knowledge on elements, we can determine if simple sugars, proteins, or carbohydrates are present.

You May Also Find These Documents Helpful

  • Satisfactory Essays

    The positive test for starch is adding iodine solution. In the experiment, the starch solution had the most dramatic reaction with the iodine solution. It turned to an opaque bluish-purple solution while other samples all turned to a colour related to orange and yellow other than the vegetable oil. But the vegetable oil was more translucent than completely opaque.…

    • 466 Words
    • 2 Pages
    Satisfactory Essays
  • Satisfactory Essays

    In this lab there are I complete two different tests. The procedure was relatively the same for each test. I would first add 3ml of a given substance to a test tube, followed by 5 drops of either Biuret Reagent or Iodine. Once the agent is added, I swirled the two substances and then observed the results. The first was to test proteins, and the second, was to test starches.…

    • 419 Words
    • 3 Pages
    Satisfactory Essays
  • Better Essays

    Helmensteine, A. (n.d). Why Is It Harder to Rinse off Soap with Soft Water?. In Slippery When Wet. Retrieved febuary 27th, 2012, from http://webcache.googleusercontent.com/search?q=cache:KEvT2bgYF1IJ:chemistry.about.com/od/howthingsworkfaqs/a/softwaterrinse.htm+why+does+latherability+allow+for+better+cleaning&cd=1&hl=en&ct=clnk&gl=us&client=firefox-a.…

    • 2897 Words
    • 8 Pages
    Better Essays
  • Good Essays

    review

    • 711 Words
    • 3 Pages

    Detergents are made up of things called surfactants. They are substances that lower the surface tension of water, allowing the dirt or stain to be removed from the clothing. Oxidizing agents are also in detergents, they act as bleaches. The last ingredient is enzymes. They speed up the chemical reactions to get the stains out quicker.…

    • 711 Words
    • 3 Pages
    Good Essays
  • Satisfactory Essays

    Carbohydrate and Points

    • 614 Words
    • 3 Pages

    8.What was the purpose of using water as a sample in some of the tests performed in the lab? (2 points)…

    • 614 Words
    • 3 Pages
    Satisfactory Essays
  • Good Essays

    Lab 2 Bio 100

    • 525 Words
    • 3 Pages

    What was the purpose of using water as a sample in some of the tests performed in the lab? (2 points)…

    • 525 Words
    • 3 Pages
    Good Essays
  • Good Essays

    2.Yes, there were differences in how the food colouring behaved in water, oil and milk, before the soap was added. After adding the food colouring into the water, the food colouring slowly began moving towards the center of the Petri dish. After adding the food colouring into the milk, the food colouring instantly sinks towards the bottom of the Petri dish, and slowly disperses. After about one minute of the food colouring sitting on the bottom of the Petri dish, it then begins to move upwards once again and separates. After adding the food colouring into the oil, it stays in the same spot, not moving at all. Due to the substances containing different materials, each acts different…

    • 848 Words
    • 4 Pages
    Good Essays
  • Better Essays

    To find the solubility of the fats, oils, soaps, and detergents, each of them were placed into different solvents to see if they dissolved. None of the oils and fats were soluble in water (H2O), sodium hydroxide (NaOH), or hydrochloric acid (HCl), but they were soluble in toluene and partly soluble in acetone. Testing the soaps and detergents for their solubility in water is the most important solubility test because they should form a lather that allows them to clean easily. Most of the soaps and detergents did not readily dissolve in water, but with agitation they all began to break apart. The lard soap was the least soluble in water, while detergent 2 was the most. All of the rest of the soap and detergents were only slightly soluble when initially placed in the water. Detergent 2 was the most soluble in many of the other solvents while lard was the least. All of the soaps and detergents except detergent 2 were not soluble in both NaOH and HCl. Detergent 2 was slightly soluble in these two substances. While…

    • 1874 Words
    • 8 Pages
    Better Essays
  • Good Essays

    Macromolecules of Life

    • 671 Words
    • 4 Pages

    The test tube with the Glucose, Starch, and onion juice were the positive controls. The test tube with the distilled water was the negative control.…

    • 671 Words
    • 4 Pages
    Good Essays
  • Satisfactory Essays

    Godrej

    • 588 Words
    • 3 Pages

     Godrej Dish WashThe special concentrated formula works wonders on the toughest of grease effortlessly, leaving your ...read more…

    • 588 Words
    • 3 Pages
    Satisfactory Essays
  • Good Essays

    Feeding Frenzy Lab

    • 1668 Words
    • 7 Pages

    The purpose of this experiment is to determine what macromolecules are in the four different foods…

    • 1668 Words
    • 7 Pages
    Good Essays
  • Good Essays

    8. Surfactants are wetting agents that lower the surface tension of a liquid, allowing easier spreading, and lower the interfacial tension between two liquids. Surfactants improve water's ability to wet things, spread over surfaces, and seep into dirty clothes fibres. One end of their molecule is attracted to water, while the other end is attracted to dirt and grease. So the surfactant molecules help water to get a hold of grease, break it up, and wash it away. Soaps and detergents are both emulsifying agents and…

    • 1219 Words
    • 5 Pages
    Good Essays
  • Good Essays

    Johnson, H. S., & Ridlen, S. F. (2013). Eggs and Cholesterol. Retrieved from University of…

    • 859 Words
    • 4 Pages
    Good Essays
  • Good Essays

    Impurities that are present in the solution can be removed by extracting them from the original solvent into another solvent. This is done by mixing two immiscible (insoluble to one another) solvents (Manion, 2004). By mixing the solvents together rapidly the exchange of the desired product from one solvent will be transferred to the other and the impurities remain in the original solvent. The two solvent layers then completely separate from each other as they are immiscible. The process washing is the reverse process, it leaves the desired compound in the original solvent and the impurities are transferred to the second solvent (Manion, 2004).…

    • 1456 Words
    • 6 Pages
    Good Essays
  • Good Essays

    Biochemistry Output

    • 258 Words
    • 2 Pages

    A positive Biuret test indicates the presence of proteins in the filtrate. Biuret is used to test for proteins. It is a light blue color and changes to purple in the presence of protein, a polymer made of amino acids. It will not change color when only amino acids are present.…

    • 258 Words
    • 2 Pages
    Good Essays