The purpose of this experiment was to make a conclusion on why Mr. R’s lawn was turning yellow, and dieing around his drainage pipe. In this experiment there were different lab groups that tested out different chemical products, that would be washed down a drain. There was a wide assortment of products that were tested in this experiment, for example, windex was one of the products being tested. On our experimental days, we would take our product, and add it to the water supply of our grass. My lab group experimented with windex. Our hypothesis was, if windex was added to the daily water supply of grass, then the grass will turn yellow and die because of the chemicals in the windex.
Our hypothesis was rejected because, our grass didn’t
start to die from the windex or turn yellow. The only difference that we had discovered, was the Windes only stunted the growth of the grass. Our plant started out at a similar height with the rest of the plants, but after the first day of adding to windex, and on the second day of observing, we noticed that our plants growth started to hinder and grow only a substantial amount. Our plant started out at a height of 7.6 centimeters and the control group started out at 6.4 centimeters. On the second day, our plant had only slightly increase in height, compared to the control group. The second day's data was 8.6 centimeters for our plant and 12.2 centimeters for the control plant. Our plants increase in height when compared to the control group wasn't that much when compared to group 6, who used rubbing alcohol, whose plant actually decreased in height and died. There plant started out at 7 centimeters, but declined in height to 6.5 and eventually ended up being 3.5 centimeters, at the end of the experiment. But, we also learned that there are products, for example shaving cream, that can increase the growth rate of your grass. The first groups grass started out at 7.6 centimeters and ended up to be 15 centimeter, at the end of the experiment. The shaving cream, we learned actually helped to improve the growth rate of the grass. All in all, my group and I learned that certain chemicals if they happen to seep into your lawn, can damage, and actually kill your grass. But, we also learned that, even though there are some products that are harmful, there are actually products that can help to improve the growth of your grass. A few errors that could account for experimental error could be not properly measuring the windex in the eye dropper. Even though one eye dropper squeeze has about an average amount of liquid each time, it still should hinder and be more or less every time you use the eyedropper. Also, this could be changed by just measuring the amount of windex used in a beaker and then just dumping it onto the plant. If certain plants data varied from one plant to the other, why did certain chemicals in the products cause the data to differentiate between the groups and why did these chemicals cause these growth defects?
The unknown bacterium that was handed out by the professor labeled “E19” was an irregular and raised shaped bacteria with a smooth texture and it had a white creamy color. The slant growth pattern was filiform and there was a turbid growth in the broth. After all the tests were complete and the results were compared the unknown bacterium was defined as Shigella sonnei. The results that narrowed it down the most were the gram stain, the lactose fermentation test, the citrate utilization test and the indole test. The results for each of the tests performed are listed in Table 1.1 below.
Alcohol, which is the nucleophile, attacks the acid, H2SO4, which is the catalyst, forming oxonium. However, the oxonium leaves due to the positive charge on oxygen, which makes it unstable. A stable secondary carbocation is formed. The electrons from the conjugate base attack the proton, henceforth, forming an alkene. Through this attack, the regeneration of the catalyst is formed with the product, 4-methylcyclohexene, before it oxidizes with KMnO4. In simpler terms, protonation of oxygen and the elimination of H+ with formation of alkene occurs.
The purpose of this experiment was to identify which brand of mint gum holds its flavor the longest. The four brands I chose were Orbit, Trident, Ice Breakers, and Wrigley's Doublemint My hypothesis was that Trident brand would last the longest and Wrigley's Doublemint would last the shortest. I did not use any people in my test. I chewed the same amount of gum at a time and the gum was all the same flavor, mint. All the gum was bought at the same time from the same store. I chewed the four brands of gums between periods of time. When chewing, I timed myself with a stopwatch. When I believed the gum ran out of flavor, I stopped the timmer and recorded the time. My hypothesis was incorrect. Instead of Trident, Orbit lasted the longest. However
Going into details of the article, I realized that the necessary information needed to evaluate the experimental procedures were not included. However, when conducting an experiment, the independent and dependent variable are to be studied before giving a final conclusion.
Following directions, paying attention, and being careful were the harder tasks. Before one starts any experiment, it is important to always be cautious and use safety first. Even though Professor Demor gave each of the eleven groups an opportunity to create their own experiment, there were specific rules each of us were still required to follow. Each group was required to use a minimum of ten duckweed plants. We were also required to use a maximum of 50 ml of solution of our choice. Lastly, professor gave us a maximum of nine cups for replication. We did not have to use all nine, it was up to us. Every group was different, but this is what our group experimented. Our group decided to see what effect high phosphate and nitrogen levels had on the growth of duckweed. The phosphate level was 100 ppm and the nitrogen level was 1760 ppm. As a group we set up three replicas cups with 50 ml of solution and one cup with 50 ml of regular pond water. After filling the cups with the right amount of solution, we took the duckweed out of the original container, using a _________ and placed it into the proper cups. In order to see a major difference amongst duckweed growth, we used 10 duckweed plants per cup, most having only 1-3 fronds. After that, we labeled the cups properly. To stop contamination, all cups were covered with plastic wrap and was securely held down with a rubber band. Lastly, once everyone finished, we were asked to place
Fair test: To make this experiment a fair test, I will set out a table
The hypothesis to this experiment is "if you place a plant under water in direct sunlight, then it will produce oxygen bubbles." In this experiment the independent variable where the plant is placed. The dependent variable is the water the plant is put in. Your controlled variable would both be the type of water used and the type of plant used. The conclusion to this experiment would still ben your hypothesis because its true which is " if you place a plant under water in direct sunlight, then it will produce oxygen bubbles." The only flaws in this experiment were that they used the same type of water and they did not try any other water. I believe that this experiment is
In the Macromolecules lab we tested for different thing such as reducing sugar, starch, and protein. In the reducing starch experiment we tested three different macromolecules. Each macromolecules was tested for sugar and how we indicated how much sugar was in each macromolecules was because the color would change. Some of the colors it would change to would be light blue (no sugar), light green (a trace of sugar), yellow (low sugar) Orange (moderate), red orange (high). Seven tubes were tested that had 10 drops of a different liquid such as onion juice, potato juice, sucrose, glucose, distilled water, reducing sugar, and starch solution. In the Iodine starch test water, starch, milk, tofu, and apples was tested. The blue indicated
experiment because the outcome of an experiment is not predicted on the basis of a single
LAB REPORT 1st Experiment done in class Introduction: Agarose gel electrophoresis separates molecules by their size, shape, and charge. Biomolecules such as DNA, RNA and proteins, are some examples. Buffered samples such as glycerol and glucose are loaded into a gel. An electrical current is placed across the gel.
The objective of this project is to use afterimages to investigate color perception in the human eye. Afterimages are the sights you see whenever you stare at a light for too long. Everybody has probably experienced an afterimage. The hypothesis of this experiment is if you look at a bright image for 5 seconds, then the afterimage will be 9 seconds because the afterimage always lasts longer than the amount of time you stare at the image. The control of this experiment is staring at the red image for 5 seconds. The independent variable is how long you stare at the image. The dependent variable is how long the afterimage appears.The constants of this project will be the same light and image and the same eye.
All in all, this was a very fun and hands on experiment. The abiotic features, such as, the water and the soil, had drastic changes to them as well, and the biotic features; such as, the wheat grass and the anacharis plant, were majorly affected in this experiment, our hypothesis was that we thought that we could neutralize laundry detergent, vinegar and distilled water, so that there won’t be any difference in the growth of the wheatgrass, and the health of the anacharis plant between the control bottle and the two test bottles. We were also observing if one type of vinegar/laundry detergent solution polluted the water more that the other. We made the prediction that the white vinegar would pollute that water more because apple cider is made from more natural substances. My group and I were incorrect, about our hypothesis, but the prediction about the pollution was correct. Both of the wheat grass plants from both of the test columns eventually died.
The experimenters manipulate the independent variable and examine whether there is any effect on the dependent variable. The dependent variable depends on the independent variable.
The study will include 60 first grade students that will be randomly selected and divided into two groups for this experiment. There will be a control group and an experimental group consisting
There is also the potential of human error within this experiment for example finding the meniscus is important to get an accurate amount using the graduated pipettes and burettes. There is a possibility that at one point in the experiment a chemical was measured inaccurately affecting the results. To resolve this, the experiment should have been repeated three times.