The purpose of this lab was to be able to use physical characteristics to determine the identity of an unknown compound. The data from this experiment classified aluminum as metallic; ascorbic acid, paraffin, palmitic acid, sucrose, graphite, and water as molecular; sodium chloride as ionic. In order to determine this, 3 tests were conducted. The first test was to test the conductivity of each substance at room temperature. In this test, only graphite and aluminum conducted.
These color changes indicate a chemical change, which show that a reaction had occurred. In the first step when o-vanillin and p-toludine, imine was formed. The color change from green to orange suggests that imine appears as orange colored. In the second step, the addition of sodium borohydride reduced the imine into another derivative, which was yellowish lime color. The solution turned clear when acids and anhydrides was added, which indicated the precipitate were dissolved.
As the compound was reacting, the aluminum pieces were also dissolving, with only a few pieces left inside. The process of the second reaction included the adding of a new substance which consisted of sulfuric acid. The sulfuric acid along with potassium aluminum hydroxide, was yielded to produce aluminum hydroxide, potassium sulfate, and water. This reaction was both a precipitation reaction and an acid-base reaction. Once the sulfuric acid was added, the reaction became very chunky.
One of the reactions you observed resulted in this product: NaCl + H2O + CO2 (g)? What well did this reaction occur in? Describe how the observations for this reaction support your answer. B BoldI ItalicsU Underline Bulleted list Numbered list Superscript Subscript70 Words A reaction I observed in number 1.)
The solid aluminum hydroxide mixed with the sulfuric acid reforms into an aqueous aluminum sulfate in the water that was also formed. In this reaction, the aluminum sulfate created in the second reaction is being used up with the excess sulfuric acid in the third. This process was initiated as soon as the precipitate formed, but only time allowed for the formation of aluminum sulfate. Thus, the solution was heated up to speed up the reaction. Once this step was completed, the solution appeared smooth and clear again, representing the aqueous aluminum
In this reaction NaOH was added to the Cu(NO3)2. The solution developed a precipitate which made the clear solution become cloudy and uniform in color (blue). The physical color change was demonstrated through the formation of the precipitate. The third step was the formation of CuO. In this reaction, the Cu(OH)2 product was heated on a hot plate and stirred continuously until the solution became colorless and a dark precipitate formed.
Introduction: The purpose of this experiment is to demonstrate the different types of chemical reactions, those including Copper. There are different types of chemical reactions. A double displacement reaction is a chemical process involving the exchange of bonds between two reacting chemical species. A a decomposition reaction is the separation of a chemical compound into elements or simpler compounds and the single-displacement reaction is a type of
Examining Generational Change toward the American Dream in Two kinds Two kinds, a short story by Amy Tan, explores the relationship between an immigrant mother and her first generation daughter. The mother, who has faith in the American dream, values the belief that to be happy, you have to be famous and change yourself; Ni Kan, the daughter, yearns for a personality of her own. Tan characterize these women as foils to each other. As a result of them being foils, they’re relationship is strained and they never have a close bond until Ni Kan grows older. Tan uses these characters to show that with each generation the American dream is changed.
Elemental copper with its elemental charge of 0 will transform to (Cu+2) when reacted with nitric acid, which is an oxidation-reduction (redox) reaction. In reaction two, once the copper has dissolved, 20 mL of 6.0 M NaOH was added to the beaker, while the solution is being stirred. The precipitation reaction is observed since (Cu+2) transform into solid copper (II) hydroxide Cu(OH)2 with sodium hydroxide (NaOH). In the third reaction, the beaker was heated on a hot plate until the solution begins to boil because at this point, the blue Cu(OH)2 has been converted to black CuO. When heated, Cu(OH)2 will decompose into copper (II) oxide and water, which is a decomposition reaction. In reaction four, 5 mL of 6.0 M H2SO4 (sulfuric acid) was added to the mixture and within minutes of stirring, all the black CuO dissolved.
Introduction The intent of this experiment is to understand how hot and cold water interact with each other by combining clear hot water and black ice cold water. I hope to learn more about how hot and cold water interact with each other. As of now, I know that cold water is denser than hot water. Knowing this I formed my hypothesis.
A foil is most commonly defined as a character who contrasts with another character. Foils are all around you, yet they usually go unnoticed. The Wicked Witch and Glinda the Good Witch. Peter Pan and Captain Hook. Shrek and Donkey.
Everyone knows the simple and easy experiment of vinegar and baking soda, but do you really know how it works. This paper will not only explain what makes these two very different chemicals react, but also what materials you will need to accomplish this easy science experiment. Baking soda and vinegar are two different chemical with two very different uses, they are not really even supposed to be used for a science experiment, take vinegar for example, some individuals use vinegar for cooking. Baking soda has a very different use, it is used for bee-stings. When vinegar and baking soda are combined, the hydrogen ions in the vinegar interact with the sodium and bicarbonate in the baking soda.
I noticed quickly that there was a mystery to how one substance can change into another. I had to find out more. As I sat there waiting, it dawned on me that this change would be gradual. After an hour, there had only been a slight variation in the color, but that change still meant something.
The signs of a chemical reaction was change in color, and smell of burning paper. The Law of Conservation Mass was not violated by the experiment. After the experiment the mass had slightly decreased. This does not show mass being destroyed but what most likely happened was the paper burning and the fumes being released into the air.
Certain chemicals added to the plastic so that its tendency to burn is eliminated or
