71 date added to the copper chloride 10. The Laboratory Investigations section s

Question

71 date added to the copper chloride 10. The Laboratory Investigations section suggests that the zinc should be a solution with stirring. Why do you think that stirring is suggeste 11. Your laboratory instructor may ask you to consalt a reference source for laboratory techniques, in order to review Bunsen burner use. If so, what reference did you use? Reference (o) What safety precautions should you take when using a Bunsen burner as part of the experiment? by i impartant to dy the d e aer e ioncompletet (o) How will you know when the copper is completely dry? (d) Why should you avoid overheating the copper? (e) Why shouldn't you weigh hot objects? 12. Given a compound with the hypothetical formula CuCl, calculate the following. (Note: CusCh is mot necessarily the empirical formula of your unknown copper chloride compound.) (a) molar mass, g/mol (b) percent Cu, % (c) percent CL%

Explanation / Answer

Question 10- Stirring simply moves the reactant molecules around, allowing them to interact with the solid pieces of undissolved reactant and transporting the product away in the bulk of the solution. It also keeps the temperature homogeneous.

Question 11 b- Any residual moisture would interfere with the reaction. Also, the weight and volume measured would be compromised.

Question 11 d- A film of copper oxide would form on the surface because of overheating.

Question 11 e- Weighing hot products can damage the balance. Any products formed (oxide layers etc) or vapors evaporated would cause the measurement to be erroneous.

Question 12 a- Molar mass of Cu3Cl2 would be 261.5440 g/mol

12 b- percent Cu= (63.546x3)/261.544= 72.8895 %

12 c- percent Cl= (35.453x2)/261.544= 27.1105 %

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