11. Which of the following statements about resonance is true? I. Resonance hybrids occur because a compound changes back and forth between two or more resonance structures. II. Resonance structures differ in the arrangement of electrons but not in the arrangement of atoms. III. Resonance hybrids contain delocalized electrons. IV. Resonance structures for a given compound always contribute equally to the resonance hybrid. V. Resonance structures occur when there are two or more valid Lewis structures for a given compound. VI. Resonance hybrids are a composite of resonance structures. a. I, II, V, VI b. I, II, V, VI c. II, III, IV, VI d. II, III, V, VI e. II, IV, V, VI 12. How many resonance forms will nitrate ion (NO3-) have? a. -1 b. 0 c. 1 d. 2 e. 3 13. A list of non-metals is given below. Which elements cannot exceed the octet rule? B Si N P O S F Cl a. Si, P, S, Cl b. B, N, O, F c. O, S, F, Cl d. B, Si, N, P e. All eight elements can exceed the octet rule. 14.Write the singly bonded Lewis dot structure for BF3. Which of the following statements best describes this structure? a. It obeys the octet rule on all atoms. b. It has less than an octet on at least one atom. c. It has a lone pair of electrons on the boron atom. d. It has less than an octet of electrons on all atoms. e. It exceeds the octet rule. 15. Using the VSEPR theory, give the electron pair orientation and predict the geometry of the following: a. CH3I b. SiH4 c. NF3 d. SCN– (C is the middle atom) e. H2S 16. Give the bond angles for the molecules given in #15
Formal Charges
Formal charges have an important role in organic chemistry since this concept helps us to know whether an atom in a molecule is neutral/bears a positive or negative charge. Even if some molecules are neutral, the atoms within that molecule need not be neutral atoms.
Polarity Of Water
In simple chemical terms, polarity refers to the separation of charges in a chemical species leading into formation of two polar ends which are positively charged end and negatively charged end. Polarity in any molecule occurs due to the differences in the electronegativities of the bonded atoms. Water, as we all know has two hydrogen atoms bonded to an oxygen atom. As oxygen is more electronegative than hydrogen thus, there exists polarity in the bonds which is why water is known as a polar solvent.
Valence Bond Theory Vbt
Valence bond theory (VBT) in simple terms explains how individual atomic orbitals with an unpaired electron each, come close to each other and overlap to form a molecular orbital giving a covalent bond. It gives a quantum mechanical approach to the formation of covalent bonds with the help of wavefunctions using attractive and repulsive energies when two atoms are brought from infinity to their internuclear distance.
Trending now
This is a popular solution!
Step by step
Solved in 3 steps with 1 images