Please also make sure the Lewis structures are hand drawn (not copied/pasted from the internet) and include your HANDWRITTEN name and date on the drawing itself. Please make sure that each picture includes your photo ID. Insert the pictures of each molecular model in the VSEPR Model column. For molecules with more than one internal atom, more than one geometry must be identified.ĭata Table 1. Since the molecule only has one central atom, there is only one geometry. Note that lone pairs (pink paddles) are disregarded when determining the molecular geometry. By comparing the structure around the carbon atom to the diagrams in Figure 11, it may be concluded that the molecular geometry is trigonal planar. Identify the molecular geometry of the molecule. Since the molecule only has one central atom, only one description is needed.ġ. There are no lone pairs around the carbon atom. A double bond contains 4 electrons a single bond contains 2 electrons. How many bonds and electron pairs surround the central atom(s)?Ĭarbon is surrounded by a total of three bonds: 1 double bond + 2 single bonds. The carbon atom in the middle is the central atom- it is surrounded by two oxygen atoms and one hydrogen atom.Ģ. There is only one central (or interior) atom in this molecule. What is the central atom? If there is more than one interior atom, list each. The completed molecule should have no “open” or unfilled holes.ġ. To create a single bond, use one of the short, inflexible connectors. To create a double bond, use TWO of the long, flexible gray connectors. Note: Consult Table 1 to determine which pieces represent the C, H, and O atoms. Although the molecule has two Lewis structures, you only need to build one molecule. Use your molecular modeling kit to create a CHO2- molecule. Hint: CHO2- has resonance structures, and there are two forms of the drawn molecule. Thus, C + H + O2 + e- = 4 + 1 + (2)6 + 1 = 18 The total number of valence electrons in CHO2 - is 18.ġ. The negative charge indicates the presence of an additional electron. Carbon is in group IV of the periodic table hydrogen is in group I oxygen is in group VI. How many valence electrons does CHO2- have? Use the periodic table to calculate the total.Īnswer: 18 electrons. Practice questions from Part 1: Practice Describing Molecular Structures (Answers Provided)ġ.
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