The substance dissolves in water but not in alcohol, is transparent when dissolved in water, is electrically conductive when dissolved in water, dries white, and has a high melting point. Out of the four compounds we received to test, according to the data we collected, sodium carbonate was the one that would work the best as a fixative for the glaze. In the experiment we conducted you will notice that the independent variables were the different compounds, while the dependent variables were the results to the criteria that had to be met. Also, during our research, we found that sodium chloride and sodium carbonate worked better than sucrose and salicylic acid because they have ionic bonds. These conditions are more suitable for ionic bonds.
Osmotic pressure, one of the colligative properties previously discussed, is defined as the pressure used by the water flow through a membrane separating two solutions with different concentrations of various solutes. The purpose of this lab was to assist in the educating one upon the freezing points of a pure solvent compared to that of a solvent found within a nonvolatile solute, while at the same time understanding and gaining a greater depth of osmosis. I greatly enjoyed this lab, although I wish it could have been conducted in less time. Observations: I took note of several components of the lab conducted. The dialysis tubing was one I especially monitored, checking every hour with recordings.
Autoclaving is the most common method, it uses steam under pressure to sterilize instruments and is the most reliable method. When sterile or disinfected items are required in the care setting single use, disposable items are recommended. 2.2 Describe how and when cleaning agents are used Cleaning agents are substances which are used to remove dirt, dust, stains and bad smells from surfaces. The purpose of these in the care setting is to avoid the spread of dirt and contaminants. There are many different cleaning agents which will be used in different places and circumstances.
Our result would have been clearer to observe if we centrifuged it long enough because we might have lost some of the precipitate while washing it since it was not centrifuged long enough. 4. Answer the post lab questions: a. Zn + I2 + H2O Zn(OH)2 + I2 b. Zn(OH)2 + CH3COOH Zn(O2CCH3)2 c. A side reaction is an unwanted chemical reaction taking place that diminishes the yield of the desired product. d. In the synthesis of Zinc iodide, acetic acid was used because the aim of the experiment was to derive Zinc iodide. If we used water instead of acetic acid then zinc would have reacted with water and become Zinc hydroxide which would hinder our purpose.
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
Confidence Report For this experiment, we need to perform two reactions. I’m very confident for the results, because we used accurate amount of the chemicals and observed very carefully of the changes. Reaction I For the first reaction, we need 25 mL of 0.005 M lead nitrate and a clean 50 mL graduated cylinder. Add 1.4 mL of 0.025 M sodium carbonate into the cylinder. Set up the vacuum filtration apparatus.
Afsana Islam CHEM 106 – LAB Lab Report #4 03/02/2015 Focus Questions: Is mass conserved in the chemical reaction that you studied in lab? The mass of the zinc and iodine were definitely conserved. The mass did not change much after the chemical reaction occurred. Raw Data: Experiment # Mass of “R” boiling tube Mass of Zinc used in Mass of Iodine used in Mass of excess zinc and “R” boiling tube after r/h/c Mass of excess zinc and “R” boiling tube after r/h/c a 2nd time Mass of “P” boiling tube and boiling chip Mass of “P” boiling tube, boiling chip, and zinc iodide after h/c Mass of “P” boiling tube, boiling chip, and zinc iodide after h/c a 2nd time 1 40.63g 2.00g 3.00g 40.83g 40.83g 41.46g 45.29g 45.29g 2 40.63g 1.00g 2.00g 41.09g 41.09g 42.25g 44.60g 44.60g
Natural gas also isn’t high in nitrogen oxide or sulfur dioxide. It is more environmentally friendly to extract natural gas than burn coal. Hydraulic fracturing is the use of fluid and material to create or restore small fractures in a formation in order to stimulate production from new and existing oil and gas wells. This creates paths that increase
pylori can be performed easily and rapidly. However, blood antibodies can persist for years after complete eradication of H. pylori with antibiotics. Therefore, blood antibody tests may be good for diagnosing infection, but they are not good for determining if antibiotics have successfully eradicated the bacterium. The urea breath test (UBT) is a safe, easy, and accurate test for the presence of H. pylori in the stomach. The breath test relies on the ability of H. pylori to break down the naturally occurring chemical, urea, into carbon dioxide which is absorbed from the stomach and eliminated from the body in the breath.
These costs would include cost of inspections and further product testing to make sure that the new material was meeting quality standards. After the decision was made to continue to produce the “Super Plastic”, we started to see other costs start to develop. These new costs were more quality failure costs known as internal failure costs. These were costs that were caused from discovering the defects in the “Super Plastic” during production but before it reached the customer. This involved rework of items to correct the defects or scrapping the product because the item could not be corrected.