Dilute Lab Report Results

The objective of the experiment “Keeping it Liquid” was to figure out what it takes to keep a compound in a liquid form which caused a phase change. A phase change is when a substance changes from one state or phase to another. There are three main phases that normally occur and they are called Evaporation, Deposition, and Melting. Evaporation is where a liquid changes to a gas. An example of evaporation is when water drops form on the glass of a cold drink on a warm day. Deposition is where a gas vapor goes directly into the solid phase without becoming a liquid first. An example of Deposition often occurs on windows during the winter months. While Melting is where a solid turns into a liquid. Melting occurs when ice turn into a liquid when

In the lab titled “Mixed Substances,” our objective was to see how properties of individual substances compare with properties of mixed substances. A mixture is a combination of two or more substances that are mixed physically but not chemically. For example, trail mix would be a mixture due to the dissimilar parts combined physically. There are two types of mixtures, homogeneous and heterogeneous. Homogeneous mixtures are uniform in structure or composition.

The objective of this experiment was to calculate the mass of hydrogen collected and to compare it to the theoretical mass of hydrogen that should have been produced based on the limiting reagent off this reaction.

In the second part of the experiment, they took 3 test tubes, one containing a small amount of potassium chloride, one with a like amount of potassium chlorate, and one that contained a solution obtained from adding distilled water to the crucible, that was used in the first part of the experiment, and heated it for about a minute, and then they added 10 ml of distilled water to each and stirred. In each of the tubes, they added 5 drops of dilute (6 M) nitric acid and 5 drops of 0.1 M silver nitrate solution, then stirred each test tube and observed carefully.

The mole is a convenient unit for analyzing chemical reactions. Avogadro’s number is equal to the mole. The mass of a mole of any compound or element is the mass in grams that corresponds to the molecular formula, also known as the atomic mass. In this experiment, you will observe the reaction of iron nails with a solution of copper (II) chloride and determine the number of moles involved in the reaction. You will determine the number of moles of copper produced in the reaction of iron and copper (II) chloride, determine the number of moles of iron used up in the reaction of iron and copper (II) chloride, determine the ratio of moles of iron to moles of copper, and determine the number of atoms and formula units involved in

The purpose of this lab was to identify unknown bacteria cultures using various differential tests, and my unknown bacteria is #17. The identification of these unknown cultures was accomplished by separating and differentiating possible bacteria based on specific biochemical characteristics. Whether the tests performed identified specific enzymatic reactions or metabolic pathways, each was used in a way to help recognize those specifics and identify the unknown cultures. The differential tests used to identify the unknown cultures were Gram stain, Catalase, Mannitol Salt Agar (MSA), Blood Agar, Novobiocin, Coagulase, and DNAse (Alachi, 2007).

2. (5 pts) List and explain the names and affiliations of the various characters/stakeholders in this story – I’m looking for us to use the story to map out the complexities that are generally associated with solving public health puzzles – the stakeholders you list and explain here should apply to many of the cases we consider going forward.

In this experiment, the limiting reactant of all trials was the magnesium while the excess reactant was the hydrochloric acid. This means that, in this reaction, the magnesium is used up completely first, leaving extra hydrochloric acid behind. This was found through stoichiometry, as the reactants were converted into each other through mass-mass calculations. As such, through stoichiometry, it was discovered that magnesium was the limiting reactant as 2.5 grams of magnesium requires 7.5g or 7.5ml (Note: 1g = 1ml) of hydrochloric acid to react. On the other hand, 50g of hydrochloric acid requires approximately 17g of magnesium to react, which is far from the original amount had. Likewise, if 2.5g of magnesium, the largest amount of magnesium

2. When 2.00 g of NaOH were dissolved in 49.0 g water in a calorimeter at 24.0 ˚C, the temperature of the

The 1 mL was then added to 9mL springwater to create the first 10 mL solution of 10 mM. The next group took 1 mL from this solution and dilute it further in 9 mL of water. This process continued for each group after. Each group took 1 mL from the previous solution until all of the concentrations were

Stover, C. K., Pham, X. Q., Erwin, A. L. Mizoguchi, S. D., Warrener, P. Hickey, M. J., Brickman, F.S. LOlson, M. V. (2000) Complete genome sequence of Pseudomonas aeruginosa PAO1, an opportunistic pathogen. Nature: International journal of science. Nature 406: 959-964. Retrieved from https://www.nature.com/articles/35023079#main

In the Affinity Chromatography experiment we were purifying our Con A proteins. In general, affinity chromatography is a technique that is used for isolating a protein, in our case Con A from a large amount of other macromolecules. Our protein of interest is captured using a microbead matrix while we let everything else flow through the column. The Sephadex matrix is made of cross-linked glucose or dextran and because our Con A has an affinity for glucose it is able to bind to those beads. In general, we began by equilibrating our column with NaCl, then poured Jack Bean Meal Extract which so happens to contain Con A through our column, the Con A then binded to the Sephadex beads, and finally we eluded with a dextrose solution so that

The flask was labeled solution #4. The molarity for each of the four solutions was calculated and recorded in data tables in the lab notebook. The absorbance at 600nm was found by placing a sample of each solution in the spectrophotometer and recorded in the lab notebook data tables (Table 1B). A plot was made in Excel of the absorbance at 600nm vs. the concentration for each solution (Graph 1B).

Background Information: According to Steven S. Zumdahl and Donald J. DeCoste (Introductory Chemistry: A Foundation), “a double replacement reaction occurs when two cations and two anions are transferred. A precipitation reaction takes place when two aqueous solutions dissolve in water, and a solid forms between one of the cations and one of the anions” (Zumdahl/Donald 187). Zumdahl and Donald also say that evidence of a precipitate includes a color change, gas production, transfer of electrons, or the formation of water. All of these types of evidence occurred in this lab. Signs that a reaction has taken place

The petroleum lab and environmental reflect the major focus of the lab well. The abstract concisely communicates the purpose of the lab, the approach, the results, and the significances of the findings. The electrical lab doesn’t have an abstract but sometimes instructors do not require an abstract section. The environmental lab does a better job at writing the abstract because it’s shorter and more direct to the point, therefore easier to understand.