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Unformatted text preview: obennoskey (blo242) – Pre-lab 5 – Lyon – (52635) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points What is the main objective of the synthetic procedure that you are going to carry out in the laboratory? 1. The main objective is to make obser- vations and then develop a theory that will explain our observations. 2. The main objective is to compare a syn- thetic procedure with a natural procedure. 3. The main objective is to create a crystal sample for subsequent analysis. correct 4. The main objective is to verify that den- sity is an intensive property. 5. The main objective is to complete the experiment in less than 90 minutes. 6. The main objective is to convert toxic reagents into a more environmentally safe form for disposal. Explanation: The main objective of any chemical synthe- sis procedure is to create the desired chemical product. 002 10.0 points You will begin your synthetic procedure by reacting ammonium iron (II) sulfate hexahy- drate, Fe(NH 4 ) 2 (SO 4 ) 2 · 6H 2 O, with oxalic acid, H 2 C 2 O 4 . What is the main product of this reaction? 1. All of the given responses are correct. correct 2. The main product of this reaction is FeC 2 O 4 · 2H 2 O. 3. The main product of this reaction is iron (II) oxalate dihydrate. 4. The main product of this reaction is an in- termediate on the way to our final product. 5. None of the given responses is correct. 6. The main product of this reaction is a yellow precipitate. Explanation: The main product of this reaction is iron (II) oxalate dihydrate, FeC 2 O 4 · 2H 2 O, which is a yellow precipitate and is an intermediate compound in the overall synthetic procedure. 003 10.0 points Once the iron (II) oxalate dihydrate, FeC 2 O 4 · 2H 2 O, precipitate is formed, why does it need to be gently boiled for a few minutes before it can be separated from the reaction mixture? How will the solid FeC 2 O 4 · 2H 2 O be separated from the reaction mixture? 1. The precipitate needs to be boiled to increase the crystal size. The FeC 2 O 4 · 2H 2 O will be separated from the reaction mixture by pouring off the liquid and leaving the solid precipitate behind. correct 2. The precipitate needs to be boiled to reduce the crystal size and create finer parti- cles. The solid FeCcles....
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This note was uploaded on 04/14/2010 for the course CH CH302 taught by Professor Mccord during the Spring '10 term at University of Texas at Dallas, Richardson.
- Spring '10