Classes of Chemical Reactions
Whenever a reaction takes place, energy is changed as well when the substances react chemically. Scientists have taken these changes in energy and generalized them. Scientists can take these generalizations and discover more about the nature and tendencies of matter. In this lab, the purpose was to perform seven reactions, write down their equations, and identify the type of reaction. In this lab report, several methods of displaying this information will be applied.
Synthesis
1. A piece of Magnesium was obtained at about two centimeters in length. The strip was thin and easily bent or twisted. It had a metallic surface and was brittle. It was silver in color. A flame from a Bunsen burner was held to the Mg, and it ignited, giving off a brilliant white light. Looking directly into the light resulted in temporary blindness, which would explain the warning on the procedures that strongly suggested not looking directly into the light. After the flame had extinguished itself due to lack of fuel, the Mg had turned from a metallic strip to an off-white powder, which crumbled at the slightest irritation. The magnesium had bonded with the oxygen gas in the air from the energy that was applied to it and formed magnesium oxide. The type of reaction was a synthesis reaction, as is shown by this equation.
2Mg(s) + O2(g) = 2MgO(s)
2. A piece of copper was obtained. It was a small, rounded wire that could be bent, although with a greater difficulty than the Mg strip from the previous account. It was copper in color (never saw that one coming, didja) and had a metallic luster. The copper was put in the flame of a Bunsen burner and after several seconds, it began to blacken. The flame was applied to it for about a minute and a half, and the copper appeared silvery under intense heat, but when it was removed from the flame, the silver color quickly faded. The copper strip was now black all over, and the change in color suggested that a chemical change had occurred. The Cu had reacted with the oxygen in the air and formed copper oxide. The black color could be scraped off, but only in small slivers. It would crumble when it was irritated with a great deal of pressure, respectively. It was a synthesis reaction as displayed by the equation here.
Cu(s) + O2(o) = CuO2
An elements¡¦ reaction to certain substances may be predicted by its placement on the Periodic Table of Elements. Across a period, an element on the left will react with more vigor than one on the right, of the same period. Vertically, as elements are sectioned into groups, the reaction of each element increases as you move down in the same group. With this in mind, the reactions of the substances involved in this experiment may be hypothesized, observed, and validated.
This process is then repeated. In the second trial, the Mg ribbon did not completely dissolve and the results were thrown out. The third trial (referred to as the second in the following analysis due to the exclusion of the previous one) was successful, and measurements can be seen below. We then moved onto the second reaction using magnesium oxide and hydrochloric acid in the fume hood. We measured 200.1 mL of HCl and placed it in the calorimeter, and an initial temperature reading was taken.
Aim: The aim of this experiment was to determine the empirical formula of magnesium oxide.
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We all know the saying, “Don’t judge a book by it’s cover.” Similarly, every element in the periodic table has its’ own story and its’ own unique meaning. However, the average high schooler simply associates these elements as something used in their chemistry classes. In fact, the elements seen on the periodic table actually have much more to do in our daily lives and in history than most people know. While giving a whole new perspective to the meaning of Chemistry, author Sam Kean successfully recounts the hidden tales through humor and wit in his bestselling novel The Disappearing Spoon: And Other True Tales of Madness, Love, and the History of the World from the Periodic Table of Elements. Specifically, Chapter 15, “An Element of Madness,” addresses the lives of several “mad scientists” associated with selenium, manganese, palladium, barium, and roentgenium that ultimately led to their downfall.
== Refer to, Chemistry Lab #1 – What’s the substance? However, I changed some of procedures during my experiment, here is the changes I made in this experiment: * I only used the toothpick to place a small amount of each sample on a separate piece of paper, instead of the spatula.
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There is nothing quite as impactful and terrifying as going through and surviving a natural disaster being Hurricane Harvey. My experience with a hurricane of this caliber transformed the way I view the world and has made me realize the importance of being ready for everything including the impossible.
In the Classifying Elements lab, the main purpose was to determine what characteristics would be used to divide the chemical elements into groups with similar properties. In order to place elements into groups two tests were held: test one was used to determine the physical properties of the substances such as being shiny or dull, and malleable or brittle. Test two was held to determine the chemical properties of the substances such as, the reaction when HCl or CuCl2 is added. After studying the two test results, it was certain that these substances could be placed in groups based upon the similar characteristics, such as physical and chemical properties.
And the symbol equation for it is:. Na2S2O3 + 2HCl, S + SO2 + 2Na + H2O. Before conducting my experiment, I will research into, amongst other things, the factors that affect the rate of a reaction. This is so that I may have enough information to understand the effect of temperature on the rate of a reaction and also gain appropriate understanding to make a suitable prediction as to what the outcome of my experiment will be. Reactions occur when the particles of reactants collide together continuously.
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he decomposed mercury II oxide into its elements by heating it. Karl Wilhelm Scheel, a
3 cm of magnesium ribbon generally has a mass of 0.04 g and yields 40 cm3 of hydrogen when reacted with excess acid. 50 cm3 of 1M hydrochloric in this experiment is in excess.
To control the rates of chemical reactions is imperative to the continued existence of our species. Controlled chemical reactions allow us to move forward in society, constantly. We find new ways to provide light and heat our homes, cook our food, and pursue in crafts that benefit our society. There are, however, just as there are advantages, disadvantages to the efficiency of controlling the rate of reactions, which in some cases can be fatal to our scientific development and progression. The growth of humankind necessitates that we must be able to control the rate of chemical reactions.
The next era is the end of the 17th century- mid 19th century also known as “traditional chemistry”. In the 1700’s, Johann J. Beecher discovered a substance called phlogiston. When substances burn, phlogiston is supposedly added from the air to flame the object that’s burning. Charles Coulcomb the ...