4. Lewis structure of HCCl3, trichloromethane o cloroform.

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1. Calculate the total number of valence electrons of all the atoms in the molecule.

Wrong. Check the valence electrons of C, H and Cl.
Correct 7 electrons for each Cl, 4 electrons for the C atom y 1 electron for the H atom. Total 26 electrons
Wrong. Check the valence electrons of C, H and Cl.

2. Select the central atom:

Correct. Is the less electronegative atom, excluding H. C
Wrong. Is the less electronegative atom, excluding H.

3. How many electrons are used to form single atoms:

Wrong. There are three C-Cl bonds and one C-H bond. All together require more than 6 electrons.
Correct. The four bonds require 8 electrons
Wrong. There are four bonds that require less than 10 electrons.

4. How many additional electrons are require to complete the valence shell of the terminal atoms?

Wrong. With four additional electrons each chlorine atom does not complete the octeto.

Wrong. With five additional electrons each chlorine atom does not complete the octeto.
Correct. With six additional electrons each chlorine atom can complete the octeto. Total 18

5. ¿How many additional electrons are needed to complete the octeto of the central atom??

Correct. The central atom, C, has already completed the octeto.
Wrong. The central atom, C, has already completed the octeto and does not require more electrons.
Wrong. The central atom, C, has already completed the octeto and does not require more electrons.

6. How is the geometry of the molecule? Estructuras

Wrong. This geometry is not the most stable for compounds of type AX4. Read more
Wrong. This geometry is not the most stable for compounds of type AX4. Read more
Correct Carbon, with a AX4 environment, has a distorted tetrahedral structure. Animation

7. Is the molecule polar? electronegativity y polarity

Wrong. The C-Cl bonds are polar and the dipolar moments don´t cancel each other.
Correct The C-Cl bonds are polar and the dipolar moments don´t cancel each other. Polarity

8. ¿What type of orbital is used by the central atom? Structures

Wrong. The four C-X bonds require more than three orbital.
Correct The carbon atom will use sp3 orbitals