I. Introduction 1. What are molecules and polyatomic ions, and what are they m

I. Introduction
1. What are molecules and polyatomic ions, and what are they made of?
2. What are the factors that dictate the physical and chemical properties of molecules and polyatomic ions?
3. What are valence electrons and molecular shapes, and why are they important in understanding the relationship between structure and properties of molecules and polyatomic ions.
4. What are Lewis Dot Structures? What are VSEPR models?
5. What were the objectives of this experiment?
6. How did you use the ball-and-stick model to determine the molecular shape and polarity of molecules?
7. What did you learn from this experiment that reinforces your knowledge about VSEPR theory, molecular shapes and polarity of molecules?
II. Results Analysis
A. Data and Calculations
Complete all the activity by hand and take photos of the molecular models, if necessary. Submit the signed datasheet you completed in class.
B. Discussion
Part I Molecular Geometry Determination of Simple Binary Molecular Compounds
1. What is the molecular geometry of H2Se, CCl4?
2. Are they polar or non-polar? Briefly explain.
3. After you examined the ball-and-stick model, what influenced the angle and shape of these molecules? Briefly explain using the VSEPR theory.
Part II Molecular Geometry Determination of Other Molecular Compounds
1. What is the molecular geometry of H2CO and HCN?
2. Are they polar or non-polar? Briefly explain.
3. After you examined the ball-and-stick model, what influenced the angle and shape of these molecules? Briefly explain using the VSEPR theory.
Part III Molecular Geometry Determination of Polyatomic Ions
1. What is the molecular geometry of NH4+ and OH-?
2. Are they polar or non-polar? Briefly explain.
3. After you examined the ball-and-stick model, what influenced the angle and shape of these molecules? Briefly explain using the VSEPR theory.
Part IV Molecular Geometry Determination of Organic Compounds
1. What is the molecular geometry of the individual central atom of CH3COCH3 and CH3COOH?
2. What is the overall polarity of each molecule? Briefly explain.
3. After you examined the ball-and-stick model, what influenced the angle and shape of these molecules? Briefly explain using the VSEPR theory.
III. Conclusions
1. Why is ball-and-stick model useful in understanding the relationship between Lewis Dot Structures and molecular shapes of molecules and polyatomic ions?
2. What do electronic geometry represent and how did you use it in conjunction with the VSEPR theory in determining the angle and shape of the studied molecules and polyatomic ions?
3. How did the ball-and-stick models assist you in predicting the symmetry and polarity of the molecules?
4. What are the factors that influence the polarity of the molecules studied?
5. Why is the study of molecular shapes important in understanding the properties of matter? Why is it important to know the polarity of molecules? Give an example of its application.

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