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1. Count the total number of valence shell (NT) for all the atoms in this molecule. this anion.
Wrong. They are more than 12 electrons
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Right. The number of valence electrons is
14
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Wrong. Not so many electrons.
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2. Selecciona el átomo central:
Right. In general is the less electronegative atom, excluding H atoms.
Central atom: carbon.
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Wrong. In general is the less electronegative atom, excluding H atoms.
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3. How many electrons are used in single bonds?:
Wrong. There are five bonds and each bond requires two electrons.
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Right. Five single bonds require
10 electrons
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4. To complete the valence shell the terminal atoms need (electrons).
Right. Three hydrogen atoms share two electrons with the carbon atom.
One share two electrons with the oxygen atom. All have saturated their valence shell. No more electrons needed.
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Wrong. The hydrogen atoms have saturated
their valence shell through C-H and O-H bonds.
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5. How many additional electrons need the central atom?
Right. The carbon atom also completes the valence shell through
four single bonds. Three C-H bonds and one C-O bond. Los cuatro electrones restantes. The remaining four electrons
will be located
on the oxygen atom.
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Wrong. The carbon atom already completes the eight electrons around.
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Wrong The carbon atom already completes the eight electrons around.
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6. How is the geometry around the central atom in this molecule? Structures
Wrong. The carbon atom has an environment
of type AX4. Check the structures table.
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Wrong. The carbon atom has an environment
of type AX4. Check the structures table.
enlace.
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Right The carbon atom has an environment
of type AX4 associated with a tetrahedral geometry of the four bonds.
Tetrahedral
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7. ¿Is this molecule polar? Electronegativity y Polarity
Wrong. This molecule has a polar bond
mainly due to the C-O-H unit.
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Correct This molecule has polar bonds
and the resulting dipolar moment is non zero.
Dipols
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8. ¿What orbital uses the central atom? Orbitals
Wrong.One "sp" hybridization involves only two positions
around the central atom.
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Wrong. One sp2 hybridization only involves three
positions around the central atom.
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Correct The four sp3
orbitals locate two lone electron pairs and two bonding (shared) pairs.
sp3 orbitals
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