1A-Water/MSG: When shaken the water and MSG they mostly dissolve creating an orange gold color, the substance foams at the top from the vigorous shaking action yet still some MSG residue remains at the bottom of the test tube, it was unclear if the reason was because we did not mix it enough or rather we added too much MSG to the amount of water given. 1A-Alcahol/MSG: These two substances barely mix together leaving a transparent yellow tint to the alcohol as well as MSG that was unable to dissolve at the bottom of the test tube. We concluded that this residue was unable to be dissolved in this liquid because the amount of MSG remaining in the bottom of the test tube was around the same amount that was originally placed into the alcohol. 1B- Alcohol/Vegetable Oil: Created a foamy top layer, was semi unclear but as to the best of my observations the alcohol nearly completely dissolved the oil, leaving a foggy appearance to the once clear
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.
Name: ___________________________________ Date: ______________ Practice Test #3 ____ 1. When a precipitation reaction occurs, the ions that do not form the precipitate A) evaporate B) are cations only C) form a second insoluble compound in the solution D) are left dissolved in the solution E) none of these 2. An aqueous solution of potassium chloride is mixed with an aqueous solution of sodium nitrate. The complete ionic equation contains which of the following species (when balanced in standard form)? A) B) C) D) E) ____ 3.
Assume that you have tested an unknown sample with both biuret solution and Benedict’s solution and that both tests result in a blue color. What have you learned? This unknown sample is water. The water does not make these two reagents change the colors because the water does not contain any protein and carbohydrate. 7.
At the high pHs, the enzyme lactase is denatured and is no longer able to break down the sugar lactose in milk. Therefore, no glucose is present and the test strips remain blue. . The optimum range for the activity of lactase would be considered pH 2-7. The water control tube should match the tube with a
We also collected an accurate amount of acidified water, used to start the reaction. Everything before that point was done with accuracy so we believed it would be a successful experiment, however, we encountered a small problem while swirling the reactants in the”R” tube. The directions stated to swirl untill the solution is in room temperature and we followed this rule but other groups swirled until they saw the reaction getting to a pale yellow. We put the solution over the bunsen burner while it was still pretty brownish in color. For our second experiment, we did not repeat this possible mistake.
To get the right result for solution reaction to occur, it is base on the measuring liquid for each solution. You need to pour the right amount of each solution so you can determine the result of solution reaction (product) will occurs accurately. If you pour your solution (liquid) into a beaker not at the right point than you can’t find the result of solution reaction (product) accurately. You need to put a lid on top of a weighing bottle because you don’t want your solution to spill out and other stuff (oil, dirt, sweat) will get into a weighing bottle that can cause the mass is not accurate and not
These conditions are more suitable for ionic bonds. That is why the sucrose and salicylic acid did not have good results, because they have covalent bonds. There were a few sources of error that could be improved in the experiment. For example, when the substance was poured into the test tubes, some of the compound remained stuck to the weighing paper. If we used a stick resistant material for this step, the whole 1g would be accounted for.
They are both very soluble in alcohol and hexane so that doesn’t help, but in water ethyl ether is semi soluble and pentane is in soluble. This would make us lean toward pentane but we felt strongly that ethyl ether because of the density was a much better test because there is much less human error and the we asked about how do you decide if something is insoluble
This was so that the mussel samples would not go bad due to heat or harsh solvents. They were extracted with a mild solvent, and then concentrated by evaporation. The team found that the vapor was not toxic, but the residue after was. Other extractions were done to see how the residue separated when added with other mixtures of nonpolar solvents. In the toxic mussels, the visible light absorption spectrum revealed a pattern that was characteristic of phytoplankton pigments.