The experimental was solution of vinegar and water. The Alka-Seltzer tablet dissolves more rapidly in water rather than the solution of vinegar and water. Confirmation of Hypothesis Contrary to the hypothesis of adding an additional acid to the solution of Alka-Seltzer and water, the time it took for the tablet of Alka-Seltzer to dissolve was not decreased. In fact, the solution of water, Alka-Seltzer tablet, and vinegar took the tablet 6.17 seconds more to dissolve the tablet of Alka-Seltzer. The amount of vinegar in the solution may have been the reason the tablet did not dissolve at a quicker rate.
With these solutions, the students were able to test whether not the amylase continues to break down starch with the presence of the carb cutter. Amylase mimics the enzyme activity that occurs in the body upon starch. The carb-cutter acts as the diet pills. The I2KI was used to add color to the solution. It binds with starch so the more starch, the darker the solution was.
Use a new glucose strip and record Data: Conclusion: According to my data, pH levels do, in fact, affect the results of Lactex. I say this because in my experiment, pre-enzyme, my solutions were all negative except for the soda. I used the test strips to determine if they were negative or positive solutions. After I put in the enzyme, Lactex, my results changed. Vinegar, Antacid, and Soap all became positive solutions after I put in the enzyme.
The silver nitrate test was conducted to test for the functional group of 2°and 3° alkyl halides as positive and negative controls were used. The silver nitrate test was conducted for a presence of the functional group alkenes and there were positive and negative control. The percent yield of dibromocholesterol collected was 91.98% and the percent yield of synthesized cholesterol collected was 140%. The percent recovery of the commercial cholesterol was 127%. This can only suggest there were some impurities in the synthesized cholesterol but other results prove it to be pure.
Online General Chemistry Titration of Acetic Acid in Vinegar Lab Manual pp158-167 When performing step 9 you want to remove all the NaOH from the beaker before adding acid (vinegar) to the beaker. If you do not remove the NaOH, it will react with the acid in the vinegar prior to starting the titration, making the vinegar appear less acidic than it really is. The next lab lists white vinegar as provided by the student. This one asks for brand and label information, yet implies the vinegar is provided by LabPaq. Results Sheet, Experiment 13 Brand of Vinegar used:________________ Acetic Acid % from bottle label_____________ | Initial NaOH Reading(estimate to 0.1 mL) | Final NaOH Reading(estimate to 0.1 mL) | Volume NaOH used(Final – Initial) | Trial 1 | 9.5 | 1.3 | 8.2 | Trial 2 | 9.6 | 1.4 | 8.2 | Trial 3 | 9.7 | 1.4 | 8.3 | Average Volume of NaOH used | 8.2 | Calculations: Normality of the acetic acid: .82 Mass of acetic acid: 49.2 % acetic acid (divide the grams, above, by the volume you used to get g/L): 4.92 Answer questions A-G in the lab manual: A.
5. How does the Mediterranean Diet influence your blood-lipid profile? By replacing some carbohydrate calories with olive oil calories, you can lower your triglyceride levels and maintain or even raise your HDL levels even before you lose a pound. 6. What is Syndrome X or Metabolic Syndrome and what are its characteristics?
INTRODUCTION AIM: The aim of this investigation is to determine and analyse the effects of temperature and light exposure on Vitamin C concentration of a sample orange juice solution by means of volumetric analysis in conducting colorimetric titration testing. HYPOTHESIS: It is predicted that exposure of juice solutions to elevated temperatures and concentrated ultra-violet light rays, will result in increased levels of degradation of Vitamin-C due to oxidation and thus decreased concentrations of Vitamin-C in comparison to control orange juice solutions unaffected by these independent variables. BACKGROUND INFORMATION: Vitamin C, scientiﬁcally identiﬁed as L-ascorbic acid (information on the enantiomers of ascorbic acid is provided in Appendix ___),is an essential nutrient for normal growth and development of the human body and many animals. It works as a co factor for enzymes essential for synthesis of collagen proteins and also assists the body in the process of healing wound, the maintenance of bones and teeth, and important processes involving ligaments, cartilage, tendons and blood vessels. Vitamin-C is unable to be stored (due to its water solubility) or synthesized by the human body and therefore must be acquired from dietary sources; primarily citrus fruits and vegetables.
Review the effect of pH on enzyme function. Students should understand that enzymes function best at specific pH levels (which vary depending on the enzyme). Non-optimal pH levels can affect the shape of the enzyme, thereby decreasing its effectiveness as a catalyst. Extreme pH levels can permanently denature the enzyme protein, whereas less extreme pH conditions may only temporarily alter . Lactase is effective at pH 2 – 7 (including dH2O) and therefore breaks down the lactose sugar in milk into glucose and galactose.
Then divide that by 30 to get 0.2 c) Cyanide affects respiration. How did the cyanide affect the sodium uptake? (Controversial too - I looked it up on Wikipedia and apparently it binds to cytochrome c in the mitochondria) (2? marks) Acts as a competitive inhibitor; Prevents mitochondria producing ATP for energy; Energy needed in active transport/sodium-potassium pump/co-transport; To remove sodium and maintain low concentration; OR Less respiration happening; Therefore glucose not being used up as quickly; Therefore rate of uptake of glucose slower; Glucose moves into cell by co-transport with sodium
How does concentration change the rate of reaction of limestone and Hydrochloric acid? By Chris Wilson Contents Page Introduction page 3 Preliminary and results Page 3 and 4 Method page 5 Prediction page 5 Table of Results Page 6 Table of averages page 7 Evaluation page 8 Conclusion Page 8, 9 and 10 How does concentration change the rate of reaction of limestone and Hydrochloric acid? The four things capable of changing the rate of reaction are, the surface area, the concentration, changing the temperature or adding a catalyst. In this experiment I will change the concentration of the acid as it is easy to control and easy to measure. I chose not to change the surface area due to the fact that it is very difficult to measure exactly the surface areas as a fine calibration is needed to measure this.