Materials Lab Report

Procedure- The procedure for this lab includes many simple steps and a few different things we are testing. Our first Procedure was to combine water and salt to see what kind of reaction it would make. First we fill the graduated cylinder with 100 ml of water. We then measured 1.0 grams of table salt on a balance to get an accurate amount. After, we took the measured amount of salt and poured it into the water filled beaker. Lastly, we watched and recorded the reaction.

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

15. Which parameter of glass is measured with bromoform and bromobenzene mixtures in a column?

Examine a piece of nichrome wire. On the data sheet, record the color and the luster of the metal. Use a forceps to hold the wire in the flame of your burner for about two minutes (recall where the hottest part of the flame is located). Describe the appearance of the wire while held in the hottest part of the flame. Allow the wire to cool and reexamine it. From your observations, determine if there was a physical or a chemical change. Give specific reasons for your conclusions. Save the nichrome wire for step #2.

The specimen ends were not thick or had moving wedge grips to keep it secure in the holders of the servo-hydraulic load frame. The movement of the specimen in the machine causes some of the data to be an inaccuracy. Also, the transverse strain causes issues with the strain gages that are called transverse sensitivity. The transverse sensitivity affects the accuracy of the data that is being collected for the transverse strain more than the longitudinal strain. This is greatly seen in the percent difference in the strain values such as in one case the Longitudinal strain was .4% while the transverse strain was 30%. Another issue with the strain gages was that if the strain gages weren’t properly placed on the specimen the data accuracy would

cpy. As seen in the time domain as well, the distribution of fracture in time is essentially random.

In this project, C. Elegans are hermaphrodite worms that will be used since they are easy to maintain in lab, as well as have short life cycles. The gene that the project attempted to knockdown in C. Elegans with RNAi treatment is the unc-22 gene. RNAi disrupts gene expression in the presence of double stranded RNA (dsRNA) that is complementary to target gene sequence. The unc-22 gene codes for a muscle protein called twitchin in wild-type worms. The Unc-22 is required for muscle regulation and maintenance in C.Elegans. To verify that the RNAi treatment worked, would check the unc-22 mRNA levels in the worms, in addition to phenotype observation.

This is done through a change in temperature. Over time, two objects that are in direct contact will

The purpose of this lab is to use chemical and physical properties to identify a material. We are working on observing, inferring and predicting. We are learning if the properties of materials that appear similar can be used to tell them apart.

In a test tube, 0.5mL of the sample will be added with 0.5 mL of water and shaken vigorously. Take note for its solubility by parts (0.5mL is one part). Keep adding parts of the solvent until the sample is soluble. If not, add until ten parts of the solvent and determine its solubility. To separate test tubes, water will be replaced with ethanol, chloroform, ether, and acetone as solvents. Same procedures were

Due to the assumptions that it demonstrates a linear distribution for plane strains throughout the laminate thickness and that out of plane strains can therefore be ignored.

Scrunch up a small piece of aluminum foil and put it in a second test tube. Set it in the test-tube rack. With the graduated cylinder, quantify 2 mL of Solution D and add it to the test tube.

We also became aware of how to perform mass measurements using three different balances. Upon weighing the penny we found that the results from all the scales where within 0.08g of each other. The results from weighing 2 pennies was not much different with a deviation of 0.04g between all three scales. For the glass beaker we obtained two results as the maximum on the analytical balance is 200g, the object we weight was well over this weight. We did however get to compare the top loader and the triple beam balances. The difference in these two scales was 0.16g. Because we do not have a true mass value for the penny we cannot prove that the mass measurements are accurate although they are precise as we received the same value each time we put the object on the balance. When we performed the volume measurement we dispensed 10-ml in to all three measuring devices using the pipet. We found that on the 10-ml graduated cylinder the colored solution passed the 10-ml line. Similarly, on the 50-ml beaker the solution was over 0-ml yet under 20-ml which left us inconclusive results. Lastly the 50-ml graduated cylinder measured 10.1ml which was the most accurate of the three measuring devices. Ultimately the 50-ml beaker and the 10-ml graduated cylinder proved not to be accurate which is supported by the data. The only measurement that proved to be more

According to the Griffith theory of failure, the critical point ought to be the centre where the ratio of compression to tension (in terms of magnitude) is 3. With a principal stress ratio of 3, failure ought to result from the application of the tensile stress alone, without any complication from the simultaneous compression parallel to the eventual rupture plane.

In 1869, the Russian chemist Dmitry Mendeleyev organized the elements in a table according to their atomic weights. Dmitry Mendeleyev organized the elements based off their physical and chemical properties. In the experiment, the similarities and differences in the properties of the representative elements in Group I, II, III, AND IV is observed. The trend in the acidity or the basicity of the elements in the third period of the periodic table are observed using H2O and HCl. The purpose of the lab is to explore the reactivity trends of metals, halogens and third party elements in groups and periods of the periodic table.