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Chemistry 161 Lab 8 - VSEPR - 1 Prelab Questions: (1) Draw the Lewis structures of the following compounds: (a) GeH4 (b) PH3 (c) H2Se (d) AsCl5 (e) ClF3 (f) XeF2 (g) SF6 (h) BrF5 (2) What does the word “VSEPR” stand for? Objective: In this lab you will study molecular geometry using VSEPR. Procedure: At the beginning of the lab you will be given a summary sheet that includes a list of molecules. You will have to draw their Lewis structures. You will use your Lewis structures to build your molecules using both the computer program and the balland-stick model. The Instructions about the use of the computer program and the set of ball-and-stick model will be provided at the beginning of the lab. Your task will be to fill out your summary sheet based on the results of your activities. Questions : (1) Explain why a lone pair of electrons might take up more space than the bonding pair. (2) If you are using the ball-and-stick model, what does each ‘ball’ represent? Each “stick”? (3) Draw the Lewis structure of O3 with a O-O-O backbone and with a cyclic backbone (three oxygen atoms in a ring). Discuss VSEPR of both structures. Discuss the bond angles. Can you tell which structure is more stable? Postlab: Your summary sheet has to be filled out and taped to the notebook. The postlab will also include the answers to the questions.