Which metals make the best battery? Discard the water and measure the mass of the metal. As a result, various laboratory tests were performed to an unknown microbe Unknown 1 found in the water of a nearby pond. Classify unknown compound based on physical characteristics of said compound. Materials and Methods Over a two week period, eight prepared types of test media were provided to identify the assigned unknown mixed. The in-lab assignment must be completed by the end of the lab period. In actuality, hot water is more dangerous than hot metal. These experiments separated and differentiated bacteria based upon specific.
We embarked on the project with the knowledge that we would have to identify a Gram + as well. Classification is based on whether there is formation of precipitates or not when metal cations react with the reagent. Introduction Every material and step in the lab is very important. As well as using the quadrant method to further isolate the colonies, a sample was taken from the best colony on the original streak and gram stained. Centers for Disease Control and Prevention, 02 Apr. Bacteria, Gram positive bacteria, Gram staining 584 Words 4 Pages main idea of this experiment was to correctly identify the unknown bacteria, 3.
The clear yellow supernate was decanted into a clean dry test tube. This aids in the recognition of which microbes are harmful or pathogenic as well as those that may be beneficial to us in some way. This experiment was used to determine the accuracy and precision of different volumetric measuring devices, as well as determining the density of an unknown metal. Repeat the above for each metal. Introduction The construction of ionic salt is based on a certain cation and a certain anion. For example, if 500 J of heat were produced when 0. Remember: An argument is not just an answer to the question.
Do not put the metal samples in the sink. Recommended to wash off immediately. Singapore: Panpac Education Pte Ltd. This is the most energy any substance takes to raise its temperature 1 ºC. These reports can contribute a significant amount of marks and yet little time or attention is devoted in understanding on how to write them well. I assert that all ideas and discussion of data contained herein is my own work unless otherwise referenced. In Part C, you will measure the heat of neutralization for the reaction of phosphoric acid and ammonia.
Waste Disposal All solutions may be flushed down the sink with plenty of water. Most, like solar power and wind power, require certain weather conditions not common in many locations. The sample was heated in a boiling water bath for 10 minutes. Ans: The signs and symptoms the young graduate student presented, show evidence of Lyme disease. The minus sign in equation 1 simply implies that the heat flows in opposite directions relative to the system and its surroundings. Seeing that no negative Gram stains were observed, a different approach was taken.
Subtract the mass of the products from the mass of the reactants and record. The 100ml Graduated cylinder was filled with water and a rubber stopper. Introduction: The purpose of this lab was to determine the identity of an unknown bacteria slant culture using a series of differential tests. This experiment will also determine if our bacteria is a fermenter of sugars and if it is catalase positive. This report may require more than 2 pages with data tables. . It is of great importance to recognize and identify the different instruments and laboratory tools, because in this way will we be able to use them properly and also to call them by name and know why.
The experimental procedures show the identity of the substance but not the amount of the present agents. Also knowledge of different bacteria helped others. The calorimeter constants seem fairly close, but that difference affected the result of the heat capacity of my metal greatly. One instance where it is important to interpret the tests is in the medical field. Chemistry, Chloride, Hydrogen 1678 Words 7 Pages test is a procedure used by chemists to identify the presence of specified metal ions, based on the color the flame that appears along with it when it's heated. The experiment was done by applying methods in order to identify an unknown bacterium. Van Nostrand's Encyclopedia of Chemistry.
Consultation with the Professor, confirmed the two unknown bacteria correctly as Pseudomonas aeruginosa and Staphylococcus epidermidis. Group I Ag+, Hg+, 3. If I had gotten the same calorimeter constant for both trials, then the heat capacity of the metals would have came out nearly equal. After observation, a sample was taken from the isolated colony on the streak plate and another streak plate was done with that, trying to further isolate the colonies. The results supported our hypothesis that when temperature increased, metabolic rate decreased. The separation of cations depends on the difference in their propensity to form precipitates.
Into the crucible, add approximately 2. Results The first test performed on the gram negative bacteria, was a Casein Test. The five groups of cations and the characteristics of these groups are as follows: i. People usually make this generalization, but they are wrong. Knowing the heat capacity of water, it is possible to find how well its environment insulates it. The only gram negative bacteria that shows a positive result on the Casein Test is Pseudomonas aeruginosa, therefore correctly confirming the unknown gram negative bacteria. Density, Fundamental physics concepts, Liquid 1631 Words 5 Pages Lab Report Purpose: The purpose of this lab experiment was to learn about the different densities of different kinds of metal.
Mass the beaker containing the reacted solution and record. Solution Preparation You will be given copper and 4 unknown metals identified only as M 1 through M 4. Background: There is a lot of importance that comes with testing urine. In contrast to taking the most energy to raise its temperature 1 ºC, this means that it also takes the longest to cool down. This chemical acts as a growth inhibitor for many other bacteria and some fungi, which allows B. Part A: Validating the Assumption about Insulation 8 Measure the temperature of the water in the calorimeter cold water by inserting the thermistor through the hole in the cup lid.