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Importance Of Practicing Safety Measures In The Laboratory
Importance Of Practicing Safety Measures In The Laboratory
Traditional experimental methods
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Alanna Crowley, Deeyana Desronvil Honors Chemistry Period 6 Group 4 Topic: Tooth Erosion Due Date: October 7,2017 (2) Background Research The experiment, focuses on the effects of acidic drinks on teeth. In this experiment, the scientist is trying to answer which liquids; Arnold Palmer, Coffee, Coca Cola, V8 Splash Tropical Blend, and crest pro-health toothpaste, affect your tooth enamel the most. The Independent Variable are four ounces of each liquid, and the dependent variable is the staining of teeth. The Constants are the toothpaste, toothbrush, the amount of time the eggs stay in the liquid, and the type of eggs used. The units used while measuring the effect of liquids on teeth is ounces. …show more content…
The scientist determined how much caffeine, and sugar was in each liquid. In order from least to greatest dealing with the amount of sugar in each liquid, is Coffee, V8 Splash Tropical Blend, Arnold Palmer, then Coca Cola. From least to greatest dealing with caffeine is Coca Cola, V8 Splash Tropical Blend, Arnold Palmer, then Coffee. As a result, the scientist believes that if the different liquids are placed in different cups with the eggs, and left for a week, then the Coffee will have the biggest effect on the eggs, because it has the most caffeine and sugar. To test this hypothesis, the scientist will start by pouring four ounces of each liquid into four different cups, and an egg in each cup. The scientist will check on the eggs every day for one week to observe and collect any noticeable changes on the eggs. The scientist will then record our data in our lab
Data table 1 Well plate Contents Glucose concentration A 3 drops 5% sucrose + 3 drops distilled water Negative B 3 drops milk+3 drops distilled water Negative C 3 drops 5% sucrose +3 drops lactase Negative D 3 drops milk +3 drops lactase 15+ E 3 drops 20% glucose +3 drops distilled water 110 ++ Questions B. In this exercise, five reactions were performed. Of those reactions, two were negative controls and one was a positive control.
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
The experiment was conducted in three parts: Part A of the experiment consisted of extracting caffeine from an aqueous solution; Part B consisted of using three different compounds: benzoic acid, succinic acid, and sodium benzoate; and the last part of the experiment consisted of using a solid neutral compound with an acid or base impurity.
The purpose of this study is to prove that this author’s spouse who claims she is an expert in tasting certain expensive coffee beverages cannot tell the difference when a less expensive substitute is prepared in the same manner and served to this self-proclaimed expert. Many people claim they can tell the difference between certain coffees, such as Folgers vs. Maxwell House, Starbucks vs. Seattle’s Best vs. Starbucks, and so on. For this project, the author intends to prove that his spouse cannot actually tell the difference between her favorite expensive Keurig brewed Emeril’s Big Easy Bold and any other brand coffee when both are prepared in the exact same manner and served side by side. To make this test more interesting and inviting the author and his spouse or test subject made a little wager that if she could achieve a 75% accuracy rate throughout the course of the experiment then she would receive the tablet of her choice in addition to her Christmas gifts versus as a part of her Christmas gifts. On the flipside of this wager, if she could not achieve the 75% accuracy mark, then the author would receive permission to upgrade his ticket choice for a 2014 Dallas Cowboys game. Results of this wager are revealed at the end of the project. In order to properly conduct this experiment a proclamation or hypothesis must be made.
The purpose of this experiment was to test which brand of whitening toothpaste is the most effective. The original hypothesis was that Crest 3D White Advanced Toothpaste be the most effective, while Arm & Hammer Advanced Whitening Toothpaste will be the least successful in whitening the tiles. The hypothesis also stated that the Sensodyne and Colgate brands will be equally as effective, while being more sufficient than Arm & Hammer, but less than Crest. The hypothesis was partially supported as Arm & Hammer was the least effective and Crest was the most. However, Sensodyne was more sufficient than Colgate. This was clearly displayed on the graphs
Dependent variable: We are measuring the time taken for the pink indicator to turn clear when hydrochloric acid is added to it. Independent variable: We are changing the molar of hydrochloric acid we are adding to the gelatine cubes. The molars range from 1-3.
That teeth will rot faster in Coke than milk or water. That there will be a slight difference between milk and water substances on decay levels.
The scientific question investigated in this experiment was, “Which household object, when catapulted at a 45 degree angle, will travel the farthest?” The hypothesis in this experiment was, “If four household objects are catapulted at a 45 degree angle, then the standard white dice will travel the farthest.” The independent variable in this experiment is changing the object launched. The dependent variable in this experiment is the change in distance traveled. The control variables are using the same catapult, tape measure, location, and maintaining the same launch angle. The control group is the catapult which remains the same throughout the experiment. The experimental group consists of the four objects being catapulted. The procedures for this experiment go as follows: Step three, place an item in the cup on the arm of the catapult. Step four, pull back the arm until it cannot go back any further. Step five, carefully release the arm which will catapult the object into the air. Step six, record where the object initially lands.
Wiener, R. Constance, Richard J. Crout, and Michael A. Wiener. "Toothpaste use by children, oral
== = == Hypothesis for the experiment: After I conduct this experiment, I expect and suppose I can recognize and physical changes, identifying the difference these two kinds of changes. Also, I will be able to know some physical and chemical properties of copper (II) sulfate, water, iron, sodium carbonate, hydrochloric acid and magnesium and identify if it is a chemical change or physical change in each part of the experiment.
The purpose of this project was to discover how the pH level affects corrosion rate. The hypothesis was if the pH level affects the corrosion rate, then the lower the pH level is quicker the corrosion rate would be. This will happen because liquids below the pH level of 7 possess stronger acidic attributes. The effect of pH level on corrosion rate was determined by depositing a copper penny in each of three plastic cups, and then three different liquids by their pH levels, were assigned to be displaced into each cup formulating a chemical reaction to be observed. The results collected during this investigation contradicted with the intended result, this experiment was conducted to determine corrosion rate; Dana Puti Vingear (pH level: 4.5) 4 2/3 days, Tropicana Orange Juice (pH level 3.88) 6 1/3 days, and Sprite (pH level: 3.4) 8 days. The results showed that the hypothesis was refuted. This happened because the preconceived idea was that the liquid with the lowest pH level; Sprite, would have the quickest corrosion rate. Dana Puti Vinegar had the quickest corrosion rate proving the statement wrong, it was discovered that it contains ethanoic acid; acid containing twice the amount of carbon dioxide than a regular acid. To further understand this topic, future research could include; how does the amount of liquid incorporated affect the corrosion rate, how does the temperature of the liquid affect the corrosion rate, and how does the purity of iron affect the corrosion rate?
I picked the science experiment elephant toothpaste this year, because it seems interesting and fun. It is also a way to test if the removal of oxygen in these experiments will actually work. I have four different experiments. Two out of the four experiments I am testing, is to see if there is a different reaction time and size between yeast and potassium permanganate and the percentage of the hydrogen peroxide. My third and fourth are tests of elephant toothpaste is to see if adding cornstarch has a color reaction to the potassium iodide to make it look like it is “glowing”, or if the yeast and fluorescent dye will make it look “glowing”. I think the elephant toothpaste that uses 50% hydrogen peroxide and potassium permanganate will have the
Caffeine is a stimulant that most people are familiar with. Most typically we connect it with coffee and sodas, but it is also found in certain foods, such as chocolate. The amount of caffeine will vary within coffee brands and in different chocolate bars, but through analytical methods we can determine an amount in each. We can then compare the results to find whether there is more caffeine in chocolate or in coffee. For this experiment I will give a brief overview of caffeine, theobromine, coffee and chocolate. Through analytical methods, I will show that there is more caffeine present in a single serving of coffee than in a chocolate bar.
We all enjoy a sugary drink every now and again,some more than others. Have you ever wondered how this affects your teeth. All major liquid drinks have some type of sugar in it,whether it is sugar or a sugar base. The project that was experimented with is the effect of sugary drinks on the teeth.
Humans have two dentitions in their lifetime, i.e. the primary (deciduous) and secondary (permanent). Each dentition consists of teeth with different shapes, sizes and functions. The classes of teeth developed throughout our life span are: