1. The background section lists observations can indicate that a chemical reacti

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: a. Part 1: 2Al(s) + 3CuC12(aq) 3Cu(s) + 2AICI3(aq) b. Part 2: CaC12(aq) + Na2CO3(aq) 2 NaCl(aq) + CaCO3(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

There are multiple questions here . i am allowed to answer only 1 at a time. I will answer 1st question for you.Please ask other as different question

1.

Any chemical reaction can be declared complete is there is no change in color of products.
a.
Here Cu(s) is being formed. So reddish color will indicate that reaction has occured.
b.
Here CaCO3(s) is formed which is white in color.
So white color will indicate that reaction has occured

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