1. The background section lists observations can indicate that a chemical reacti
ID: 897391 • Letter: 1
Question
1. The background section lists observations can indicate that a chemical reaction has occurred. Using your observations recorded during lab (p. 10), what did you observe that would indicate that the following chemical reactions occurred Part 1: 2Al(s) + 3Cucl2(aq) 3Cu(s) + 2AICI3(aa) a. b. Part 2: CaCl2(aq) + Nazco,(aq) 2Naci(aq) + Caco,(s) 2. Offer one possible reason for the following observations. Be specific and discuss how your reason would affect the calculated value. Do not just list "random error" or "systematic error" as a cause. a. A percent yield greater than 100% for Part 2. b. An extremely small percent yield (ie.Explanation / Answer
1.
a. Aluminum reacts with copper(II) chloride, CuCl2, to form copper metal and aluminum chloride, AlCl3.
(metallic copper gets precipitated out)
b. The formation of the yellow gas indicates the presence of CO2. A solid is formed in the solution. The solid in the solution is CaCO3 (chalk).
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