To limit the amount of errors or contamination in any procedure lab safety rules, gloves, and the aseptic technique was strictly enforced throughout the experiment. The first step to identifying the unknown bacterium was the Streak Plate Method. This method is used to isolate a pure culture from a mixed culture. Also, this method included streaking a tryptic soy agar (TSA) plate into four quadrants, and later incubating the plate for 24 hours.
One of the most difficult challenges that faces our society about water pollution is cleaning after a body of water have been contaminated. Our design team aimed to design a sufficient water filter that would improve the water quality in a body of water have been contaminated. An ideal body of water should be contaminant free, with a high potential Hydrogen (pH) and Nitrogen Dioxide (DO) level. Low pH and DO level which could cause health hazards to individuals who used the water as a drinking water. 2.
The Honors Earth Science classes went to the Susquehanna River to solve a problem. The problem was not knowing if the is healthy. The classes want to know if the river is healthy, because the students live near the river, and it affects the classes everyday lives. To answer the problem, the classes did a series of tests, and made physical observations at various islands in the river. The students used test kits and other tools to test pH, temperature, phosphate, nitrate, turbidity, and dissolved oxygen.
Develop a hypothesis regarding which water sources you believe will contain the most and least contaminants, and state why you believe this. Be sure to clearly rank all three sources from most to least contaminants. Hypothesis = Least contaminants: tap water Medium contaminants:
Results/Discussion In the first experiment the class used chlorine 36 that was in the middle of a metal plate that was placed under Geiger counter and the starting measurement was 30 mm from the detector to the last reading was 84 mm. As the plate containing chlorine 36 was moving away from the Geiger tube the amount of counts were decreasing until the fourth measurement at semi 3 mm was 2476.5 average clicks. The fourth set must been the right distance away from Geiger counter to pick up on gamma radiation of the chlorine 36 however, the radiation is being admitted could've been beta for the radiation this is unlikely because the mass of the nucleus did not change. After this experiment was ran calculations for the log D which is log distance
In conclusion, the objective of the experiment was met since the process of osmosis was observed and
An experiment was conducted to determine the dissolved oxygen, phosphate and nitrate in Freshwater Creek on 22nd February 2016 at 10:46 am. The same tests were done by students previously however in this report only the recent 2 years results will be taken into consideration for comparing trends, anomalies and interrelationships. The recommended levels of dissolved oxygen saturation is 85%. The dissolved oxygen saturation last year was 85% at water temperature 22.9° and 2 years ago being 92% at water temperature being 23.1°. However this years it was recorded to be 80% at water temperature of 27.2° (see appendix 1 for the raw data table and calculations of Dissolved Oxygen).
The control group for the experiment was the dialysis bag and potato cores that were immersed in distilled water. Because the experiment was based on the change in molarities, distilled water was a good control because distilled water is pure and has no concentration of any solution. The experimental groups for this experiment were the dialysis bag and the potato
Develop a hypothesis on the ability of your filtration technique to remove contaminants. Hypothesis = For this dirty water can be treated it will then be clean and drinkable water 2. Based on the results of your experiment, would you reject or accept the hypothesis that you produced in question 1? Explain how you determined this.
Filtration involves passing the solution through a porous material that will keep solid particles from passing through, but allows liquid to move through it. You will use several hazardous chemicals in this experiment. List the reagents and their
Effectiveness of UV Light on Contaminated Water 1 Effectiveness of UV Light on Contaminated Water: The study of how UV rays disinfect water William Stadtlander Honors Biology Leya Joykutty Period 8 December 8th, 2015 Effectiveness of UV Light on Contaminated Water 2 The purpose of this project is to investigate the disinfecting properties of sunlight(UV Light). The control group is the 3 types of lake water, and the variable groups are the water exposed to sunlight. The independent variable is the strength and different types of lights used, also the time under the light.
One area that was made was that we forgot to time the rate that the water dripped into the graduated cylinder at the beginning so we started timing the rate a little late. At most we started to time the rate about a minute or two into the process. On the instructions it said that we had to clean our device by running tap water through it until the water becomes clear but we skipped that step and went right into pouring the contaminated water into our device. Skipping the step of cleaning our device most likely changed the results of the turbidity a bit by increasing the chances of more contaminants entering into the filtered water. Additionally, some of the contaminated water did not go through the filter paper because it shifted during the process which resulted in it not catching all of the particles.
However, in real life, there are several ways to purify water, including boiling, chemical treatment, and filtration. A study published in the Journal of Environmental Health Sciences found that ceramic water filters are an effective way to remove bacteria from contaminated water sources (Wegelin et al., 1998). Nutrient Requirements: In the book, the characters struggle to find food, and they are forced to hunt and gather their own food. However, it is important to understand the nutrient requirements of the human body to survive.
Introduction: In this lab, of water in a hydrate, or a substance whose crystalline structure is bound to water molecules by weak bonds, is determined by heating up a small sample of it. By heating, the water of hydration, or bound water, is removed, leaving only what is called an anhydrous compound. Based on the percent water in the hydrate, it can be classified as one of three types: BaCl2O ⋅ 2H20, with a percent water of about 14.57%, CuSO4
Basically, this method involved making thin film around the round bottom flask. The active ingredient and surfactant were dissolved in organic solvent such as chloroform to get clear and homogenous mixture. The organic solvent was removed by rotary evaporation and forming dry thin film of dissolved components. The thin film was thoroughly
