Greetings, hopefully this folders will be helpful for solving the rest of pre la
ID: 546815 • Letter: G
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Greetings, hopefully this folders will be helpful for solving the rest of pre lab questions Greetings, hopefully this folders will be helpful for solving the rest of pre lab questions Copper From Start to Finish: A Sequence of Chemical Reactions Prepared by Megan Quinn, Yuhong Wu, and Michelle, Greene Purpose Observe the physical changes and measure the percent recovery of copper after a series of chemical reactions Summary The Law of Conservation of Mass states that in a reaction, the mass of the products is equal to the mass of the reactants (Crowell). Copper is an element that can be dissolved and precipitated through a series of chemical reaction. Based on the Law of Conservation of Mass, the starting mass of a copper sample should be equal to the mass of the copper sample recovered at the end of the reactions. Chemical reactions are processes in which a substances change into other substances; the physical manifestations of a chemical reaction include color changes, heat content changes, gases production, and precipitates formation (Askew). The chemical transformations that copper undergoes throughout the experiment are shown below. The percent recovery for copper will be calculated at the end of the reaction series as relative measure of how well the experiment was conducted. Background Overal Chemical Reaction In this experiment copper will undergo a variety of chemical reactions. There are six main types of chemical reactions in chemistry: oxidation-reduction, decomposition, synthesis, double displacement, precipitation, and acid-base. The first transformation in the series is an oxidation reduction reaction followed by a double displacement precipitation reaction, decomposition reaction, synthesis reaction, and ending with an oxidation - reduction reaction resulting in the formation of copper. Decomposition reactions involve breaking a compound into its elemental parts (in this experiment the decomposition is performed by heat). There are two types of synthesis reactions: when two elements combine to form a compound and when two compounds Copper From Start to Finish-Explanation / Answer
5.a .phenopthelene indicator
5.b phenopthalene dont show any color in acidic medium and exhibits pink color in the basic medium
6.a If the blue color of the reaction mixture doesn't disappear it means sufficient Mg has not been added.
6.b. HCl oxidezes Mg to Mg+2 along with H2 gas. If the bubbles stop coming while adding the HCl to the reaction mixture it means all the Mg has been oxidized
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