Week 2 Lab Essay examples

1. Record your hypothesis about what will happen when Biuret solution is mixed with the solutions from test tubes 1, 2, 3, and 4 here. Be sure to use scientific reasoning to support your hypothesis.

Based on the results of your experiment, would you reject or accept each hypothesis that you produced in question 1? Explain how you determined this.

The experiment aimed at determining the quality of drinking water through the examination and comparison of the level of contamination in tap water, Fiji bottled water and Dasani bottled water. Through the experiment the researcher wanted to prove that bottled water is worth the cost. The methods used included the ammonia test strip experiment, the chloride test strip experiment, the 4 in 1 test strip experiment, the phosphate test strip experiment and the iron test strip experiment, which were simultaneously performed for the three water samples. The results indicated that bottled water tend to be less contaminated as compared to tap water, thus making them safe for drinking and effective for preventing waterborne diseases. the Dasani water had the lowest level of contamination, followed by the Fiji water, with the tap water having the highest level of water contamination.

My hypothesis was supported because there were some contaminants that were visible and there were some that were not visible. One of the contaminants that was visible with sample c was copper which was orange. Copper is an orange/red metal and it can be found in small amounts (less than 1 parts per million) in natural, ground, and surface water. However, elevated amounts may occur if corrosive water completely gets dissolved with copper water. This will only happen if corrosive water stays unmoving with copper water for six or more hours which will likely make the water more unsafe for drinking. It will be more unsafe for drinking because it can give a bitter taste and can cause discoloration in the water. Copper is also a contaminant that

All the water type is brown and the mixture showed it. For this experiment there where different contaminates with the water. For the tap water it was the dark water and it had a bad smell to it of dirt. When it came to the water with oil it had a light brown which also had a dirt smell. The one with the vinegar water it had a grey color. This one had better and clean water. The last one with the laundry soap it was the darkest brown. I think to my surprise was the tab water with the soil mixture. With that being said the vinegar and soil mixture seemed to be cleaner then all of them.

Fig. 1. This picture illustrates the process of quality assurance of drinking water from the Nestle Company (1).

My science fair topic is how does the location of water affect the pH and turbidity. I chose this topic because water pollution is a big problem because the water may no longer be drinkable. Thee hypothesis is, the water sample from my pool will have the least amount of turbidity and highest pH because we put chlorine in the water and it is cleaned often. The manipulated variable is the water samples. The responding variable is the water pH and turbidity. The manipulated variable would be the amount of water, turbidity tube, technique the pH kit and turbidity tube is used, pH kit, and environment. There isn’t very much fresh water and we need to conserve it, polluting the water just wastes it which doesn’t help. I want to learn how to measure how safe the water may be by testing pH and turbidity. I also wanted to learn about how pH affects water and what turbidity is. Water is very important for many organisms so everyone should help conserve.

Abstract: The main objective of this lab was to determine how to effectively measure and compare bacteria in different water sources, specifically in this lab by using Coleman Drinking Water Purification Tablets. The tablets did not eliminate bacteria to the level found in tap water, however they were still very effective at eliminating bacteria. The tablets as a result can be trusted by the user to remove any unnecessary health risk when drinking water from an untreated source.

I accept my hypothesis because there was no sign of vegetable oil after filtration. I accept my hypothesis because there were definite signs of vinegar after filtration. I accept my hypothesis because there were still signs of detergent after filtration, but there was less than before. I accept my hypothesis because all of the large contaminants were filtered out but some smaller ones were still present because the water is not completely clear. I reject my hypothesis because all of the water types are pretty even regarding their chemical components.

When it comes to the topic of safety of Tap water or Bottled water, most of us or the Food and Drug Administration or the Environmental Protection Agency enthusiast will readily agree that “without a doubt, we have a drinking water system that’s the envy of the world,” that “it’s an urban myth that Bottled water is safer than Tap Water.” Where this agreement usually ends, however, is on the question of whether Bottled Water or Tap Water is safe for consumption. But the truth remains that “some

The solution turns white/ creamy in color. There is visible precipitate and the gas above the liquid is no longer visible.

“If you want to go beyond that small percentage of people who are already environmentally and scientifically aware, you have to make your work somehow link with a passion, interest, or profession of someone who isn 't interested in science or nature” (Nalini Nadkarni, n.d.). Like most who are not fully educated on a subject until they research it or take a course on it, I was not aware of the overall importance or impact that environmental science had on my everyday life and the world around me. One of the major things that have been brought to my attention in this course is environmental issues, and what I can do to help improve them.

There were several different objectives for this lab. It introduced the thermomechanical properties of thermoplastics, and provide familiarity with dynamic mechanical analysis (DMA) of thermoplastics. These DMA results were interpreted using time temperature superposition (TTS) and the master curve as a design tool, this could be used to determine the linear viscoelastic range and observe the creep behaviour of high density polyethylene (HDPE). Gaining familiarity with dynamic properties of HDPE was also intended for this lab.

This book has a very unique and exciting design and look. The book focuses on current environmental issues that face the world. It is extremely interactive and is presented in the perspective of four characters. These characters

The town’s natural resources must provide a source of food, shelter, and energy. Once the students have finished their town creations, we will hang them and have students explain them. Next, we will hand out greenhouse gas explanation sheets and go over some of the basic types of emissions, and discuss which ones might be produced by each town. This segment of our lesson is particularly important because it gets students thinking about how the actions of their local communities can have a big impact on the environment. In our last lesson component we will show students pictures of different ecosystems and have them decide whether these sources contribute to pollution, and if so, how they can be reduced. This will serve as both a summative assessment of students’ knowledge and a call to action to help protect the local environment.