Thermite demo CER 2022 Prachi Patel

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Purdue University *

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112

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Chemistry

Date

Dec 6, 2023

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pdf

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2

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CHM 11100 Activities and Explorations Claim, Evidence, Reasoning Thermite Demonstration due November 20 at 11:59 PM, worth 10 points Instructions: Upload your work on this page to Brightspace by typing or writing your responses and saving the file as a pdf file with your first and last name and uploading that file. You can also take pictures of your written work and paste them in! Only use the PDF format, don’t use Pages, HEIC, or docx. Watch the Thermite reaction demonstration and answer the following questions. 1. (1 pts) Casey claimed that the thermite reaction was an exothermic reaction, identify at least 2 pieces of evidence from the video that support her claim (the reaction is exothermic). The reaction is exothermic because there was a lot of heat and spark given off. The heat was going from the system to the surroundings. The system lost energy through sparks. 2. This is a rendering of the thermite reaction. Include labels and a description for the following: (1 pt) The system (Hint: What is in the crucible, the cup in the ring stand?), The system is the Iron oxide, Aluminum, and Potassium permanganate with the glycerin (1 pt.) the surroundings, and The surrounding is everything else including the crucible, the sand, the air in the atmosphere, and the ring stand. (1 pt.) draw an arrow or arrows to describe the flow of energy between system and surroundings (which way does it flow, system to surroundings, or surroundings to system?). 3. (3 pts.) Write a balanced chemical equation for the thermite reaction showing all states of reactants and products. Assign oxidation numbers to all elements in the reactants and products. Fe 2 O 3 (s) + 2Al(s) à 2 Fe(l) + Al 2 O 3 (s) Fe=+3 so Fe 2 =+6 O=-2 so O 3 =-6 Al=0 Fe=0 Al=+3 so Al 2 =+6 O=-2 so O 3 =-6
4. Write out reasoning for the following claim: The thermite reaction is exothermic. (We are giving you the claim!) Reasoning: (3 pts) Assemble an argument by connecting your observations and evidence to the claim to justify why the reaction is exothermic. Explain your reasoning and use scientific principles about heat flow that we have explored in class. You must discuss the energy flows in the reaction and what evidence you have for that energy exchange (you can use your picture drawn in #2!). The thermite is an exothermic reaction. It is an exothermic reaction because the light that was given off during the reaction indicated that the heat was being released. If the heat is being released it is going from the system to the surrounding. That’s the arrows are on two are going to the surroundings from the system. In exothermic heat is given off and it goes from the system to the surroundings; that is why this reaction is exothermic.
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