In constructing your models, use the following guidelines: (a) Each ball represents an atom, while each stick or spring represents a bond. Use a stick for a single bond, and springs for double and triple bonds. Use TWO springs to construct a double bond and THREE springs to construct a triple bond. (b) Use the black balls for carbon atoms, making sure all 4 holes get filled with a stick or spring. (c) Use the red balls for oxygen atoms, making sure both holes get filled with a stick or spring. (d) Use the yellow balls for hydrogen atoms, making sure the lone hole gets filled with a stick or spring. (e) Use the green balls for chlorine atoms, making sure the lone hole gets filled with a stick or spring. Use the orange balls for fluorine atoms, making sure the lone hole gets filled with a stick or spring. (f) (g) Use the purple balls for bromine atoms, making sure the lone hole gets filled with a stick or spring. (h) Hydrogen and halogen atoms should be positioned towards the exterior of the molecule. (1) Carbon atoms should be positioned towards the interior of the molecule. (6) If a molecule calls for a lot of one type of atom and just a few of another type of atom, then the atoms "of many" should be positioned towards the exterior of the molecule, while the atoms "of few" should be positioned towards the interior of the molecule. PROBLEM 4. The basic procedure: 1. Build 2 models of bromodichloromethane. Provide a condensed structural formula. 2. Set aside one of the models and LEAVE IT ALONE. DRAW IT. 3. Take the other model and have Br switch places with one of the Cl's. This is called an exchange. DRAW THE NEW MOLECULE. For the post-lab, make the following observation: 1. How does the new molecule (step 3 above) compare with the original (step 2 above)? Choose ONLY one of the following answers. They are: identical to each other; stereoisomers; constitutional isomers; or completely unrelated. 2. Using at least one complete sentence, discuss a characteristic shared (or not shared) between the two molecules that leads you to your answer to #1 above.