This experiment will last several laboratory periods. A table of accepted value of metals and their densities was given out to each group so they could match the. Determine the mass of a 150 mL beaker and record. Must: Explain what a precipitate is — E Should: Be able to use different tests to identify metal and non-metal ions — C Could: Explain how to identify common salt — sodium chloride — B Keywords: Ion, precipitate, qualitative, cation and anion. The enthalpy of reaction is the result of the difference in potential energies of the reactants and the products. The instructor verified this to be correct.
That is, any heat that flows out of a reaction must flow into the surroundings, and vice versa. Let the crucible cool on the clay triangle for 60 seconds. Where did the specimen come from, and what methods were used to identify it? In part D, you will measure the heat of solution of ammonium phosphate. People usually make this generalization, but they are wrong. Interactive Poster Session Once your group has completed your work, prepare a whiteboard that you can use to share and justify your ideas.
In Part C, you will measure the heat of neutralization for the reaction of phosphoric acid and ammonia. The purpose of this lab was to identify an unknown microorganism by using various differential tests. The black-legged tick or the deer tick is the principle vector of this disease Lyme. If our assumption that the calorimeter apparatus is not involved in the heat transfer is correct, then the two sides of the equation should be equal. Ans: The environmental pathway for the vector of this disease would be a forested habitat. Research: In today's world, almost everything we do needs power from fossil fuels or waterfalls.
The tested elements are sodium, lithium, potassium and calcium and each of them were placed in a beaker filled with water. The acid reacts with a base to produce water and a salt. This test will be conducted in Part A of this lab. To test this you will be checking the melting point, solubility, and conductivity of various substances. The Einstein-Debye model of describes the low temperature behavior. Methods Determine cation present in compound based upon a flame test. In other words, we can assume that the thermodynamic universe is composed of the system and the surrounding water.
Pseudomonas aeruginosa is a gram negative rod shaped bacteria that was first discovered in 1882 by a pharmacists named Carle Gessard 2. The sample was heated in a boiling water bath for 10 minutes to allow for the hydrolysis of thioacetamide producing H2S. Also knowledge of different bacteria helped others. The amount of heat that flows into or out of the surroundings is determined with a technique called calorimetry heat measurement. This report discloses the basic laboratory instruments will be used in each of our practices. The container was then tared so the scale would.
A lab report should not be. An unknown bacterium was handed out by Dr. The work term in reactions that do not involve gases is zero, so all of the energy change results in heat. The use of an insulated container Styrofoam cup in this experiment allows us to assume that there is no heat transferred through the calorimeter walls. In contrast to taking the most energy to raise its temperature 1 ºC, this means that it also takes the longest to cool down.
Listen Read phonetically Dictionary - View. This means that water has the highest heat capacity. When the hydrate metal salt crystal is heated, the attractions to the water are broken by the heat energy and the water escape from the crystal. Table 1: Tests and Results for Gram Negative Bacteria Test Purpose Reagents or Media Observations Results Gram Stain To determine whether the bacteria was gram negative or gram positive Crystal violet, Iodine, Alcohol, Safranin Red Rods Gram Negative bacteria Casein To determine if the enzyme casease was produced to break down the milk enzyme casein Milk Agar white opaque Milk Agar changed color where bacteria was smeared, turning a brown color Positive, the bacteria produced casease The first test performed on the gram positive bacteria was the Nitrate Test which turned red after adding reagents giving a positive result meaning the bacteria reduced nitrate into nitrite or something further. Contrary to this, studies have found that B. The second test performed was a Urea Test which also gave a clear positive result confirming that unknown gram positive bacteria as Staphylococcus epidermidis because Staphylococcus aureus gives a negative result. It is also one of the few bacteria to synthesize a protein capsule.
The most accurate way of determining density is dividing mass by volume. Ans: The signs and symptoms the young graduate student presented, show evidence of Lyme disease. Normally I think of metals as being very hot and staying hot, but this experiment proved how metals actually cool very quickly. Bacteria, Bacteriology, Genus 1226 Words 4 Pages Unknown Report 3. This immediately ruled two of the gram positive bacteria Bacillus cerus and Bacillus subtilis. Another purpose is to understand how fireworks work. Antibiotic resistance, Bacteria, Gram staining 1085 Words 4 Pages Jordan Hansen Unknown Lab Report Professor Zelman April 9, 2012 Identifying an Unknown Bacteria Introduction Knowing the identity of a microorganism is extremely beneficial.
This deduction was reached for a couple reasons. Upon reviewing the identification tables, the deciding biochemical test was the Casein test which tests for the production of the enzyme casease to break down the milk protein casein. St Louis: St Louis Community College at Meramec, 2011. Slowly pour all the acid into the beaker containing the hydrogen carbonate. It had many well isolated colonies. It showed Gram positive rods. 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.