6. Consider the molecules CHs, NCl3, BFs, and CO2 a. In which compound are the b

Question

6. Consider the molecules CHs, NCl3, BFs, and CO2 a. In which compound are the bonds most polar? b. Which compound on the list has the most nonpolar bonds? 7. Which of these would you expect to be least soluble in cyclohexane (CsHe)? The most soluble? Circle your answer. Explain. a. Least soluble NaC CaHs CH3CH2OH b. Most soluble NaCl Explanation 8. Consider the following four compounds MgCl2 NH3 CH4 CO a. Which of the compounds above is more likely to be a crystalline solid at room temperature? Explain. b. Place the four substances in order of increasing boiling point

Explanation / Answer

Q6

a)

i.

CH4 = nonpolar, will be tetrahedrla, not enough electron distribution for dipole formation

ii.

NCl3 --> lone pair is present, reppeals bonded chlorine atoms, so expect polar molecule

iii.

BF3 = this has 120° angle between all species, since there are no lone pairs ( octect exception )

this i snon polar

iv)

CO has O=C=O

180° angle beteween cancels poles

so

the most poalr is NCl3

b)

the most nonpolar bonds -->

BF3 = B = 2.0, F = 4.0; 4-2 = 2;

CH4 = C-H = 2.5-2.1

CO2 = C-O = 3.5 and 2.5 = 1.0

therefore

C-H bond

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