First place a small amount of the spinach provided in the mortar, just enough to cover its bottom; combined with the sand provided to break down the call walls. A 1:1 mixture of hexane and acetone was determined to best solvent for this extraction. Knowing this add one mL of the pure hexane and one mL of the pure acetone to the mortar. Grind the contents until the cell walls have been adequately broken. Transfer the mixture to a centrifuge tube to separate the sample into layers, to help remove the water. Once the sample is finished spinning extract the organic layer and place in a test tube.…
In order to experiment with distinct components of a mixture, they must be first separated so they can be observed individually. This is accomplished in this lab by the technique called thin layer chromatography (TLC). TLC involves a stationary phase, which the TLC plates as well as a mobile phase, which could be one of two solvents used: ethanol-acetone for TLC. Dyes in a sample separate consequently because of their unique polarities. As a result, nonpolar substances travel further than polar substances in this process. The separation of a mixture into its components by TLC transpires because the distinctive components of a mixture interact to different extents with the stationary and mobile phases.…
Insert completed data tables for each part of the lab. Be sure that the data tables are organized and include units when necessary.…
a. Dry ice (CO2) sublimes (changes from a solid to gas) at -78 ⁰C at standard atmospheric pressure.…
A buffer is a solution that resists changes in pH when H+, OH-, or H20 is added. By using standard lab equipment, a lab pro diagnostic tool, and acidic and basic solutions, the pH can be found. By recording the pH while adding a base or an acid gradually to a buffer solution you can find the capacity of each buffer to resist drastic changes in pH. The best buffers will keep a solution from becoming either too acidic or basic with the addition of a strong base or acid.…
If you wish to have any answers considered for a re-grade, your exam must be completed in INK.…
You have carried out a first-hand investigation to compare the reactivity of an alkene with its corresponding alkane.…
3-hydroxy-3methylglutaryl-CoA reductase (HMGR) catalyzes the formation of mevalonate in the biosynthesis of sterols and isoprenoids. The activity of this enzyme is regulated physiologically through synthesis, degradation and phosphorylation to maintain to maintain the concentration of the mevalonate-derived products. Transcription and translation of HMGR increase when the concentrations of products of mevalonate pathway are low while on the other hand when the concentrations are high, the intracellular HMGR concentration decreases rapidly. The third level of regulation is achieved by phosphorylation of S872 by AMP-activated protein Kinase, which decreases the enzyme’s activity.…
CHAPTER 4 REACTIONS IN AQUEOUS SOLUTION MULTIPLE CHOICE QUESTIONS 4.1 Which of the following compounds is a strong electrolyte? E A. H2O B. O2 C. H2SO4 D. C6H12O6 (glucose) E. CH3COOH (acetic acid) Answer: C 4.2 Which of the following compounds is a strong electrolyte?…
2. For each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table.…
In the study, scientists speculate that clay hydrogels provided a platform for chemicals to come together and form complex biomolecules. Experiments using water samples that resemble ancient seawater have shown that clay forms a hydrogel under certain conditions. Hydrogel is a network of polymer chains that has the ability to soak-up huge quantities of water. Basically, these gels are super-sponges. Over billions of years, the trapped chemicals reacted and formed biochemicals such as proteins and DNA.…
There are twelve key principles of green chemistry that are used to evaluate how green a reaction may be. A green reaction prevents waste before it is created with little to no toxicity. Green experiments should be designed to maximize the starting materials into the final products while minimizing toxicity. Raw materials should be renewable and products should break down and not persist in the environment while reducing derivatives. All experiments should be performed in real time with use of catalysts while minimizing potential chemical accidents.…
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Find the combination that will give a gas as a product A. AgNO3(aq) + NaI(aq) B. HCl(aq) + Na2CO3 (aq)…
The findings will better inform researchers across the world of how to make their biomaterials appropriately sticky for stem cells to grow.…
Assistant Examiners (AEs) will be contacted by their team leader (TL) through Scoris™, by e-mail…