Lewis Dot Structures: Sigma & Pi Bonds

Place the following in order of  decreasing bond length around the central element. SiO3 2–        CO2        CO 3 2– A) CO2 > SiO3 2– > CO3 2– B) CO2 > CO3 2– > SiO3 2– C) CO3 2– > CO2 > SiO3 2– D) CO3 2– > SiO3 2– > CO2 E) SiO3 2– > CO3 2– > CO2

Which molecule in each pair has the shortest bond length? I. O2 vs. N2           II. H 2O or H 2S         III. NO + or NO -   a. I. N2   II. H2O      III. NO + b. I. N2   II. H2O      III. NO - c. I. O2   II. H2O      III. NO + d. I. O2   II. H2S      III. NO - e. I. N2   II. H2S      III. NO -

Select the strongest bond in the following group.  (a) C−S (b) C−O (c) C=C (d) C=O (e) C−F

Which statement best explains why the sigma (σ) bond is stronger than the pi (π) bond? (a) Sigma bonds involve more electrons than pi bonds. (b) Sigma bonds are shorter than pi bonds. (c) There is greater overlap of orbitals in the end-to-end form of sigma bonds. (d) Single bonds are always stronger than double of triple bonds. (e) The question is incorrect, sigma bonds are weaker than pi bonds

Choose the covalent bond below that is the strongest (highest bond energy). a.  N=O b.  N-O c.  N-N d.  N=N e.  N-C

When the carbon-carbon bonds in ethane (C2H6), ethene (C2H4), and benzene (C6H6), are arranged in order of increasing length (shortest bonds first), what is the correct order? a) C2H6 < C2H4 < C6H6 b) C2H4 < C2H6 < C6H6 c) C6H6 < C2H4 < C2H6 d) C2H4 < C6H6 < C2H6

Examine each of the following molecules. Which molecule has the shortest carbon-nitrogen bond?  

Select the strongest bond in the following group. a. C-S b. C=N c. C=O d. C=C e. C-F  

Which of the following statements about covalent bonds between nitrogen atoms is correct? a) The bond length for a nitrogen single bond is shorter than for a nitrogen double bond b) The bond energy for a nitrogen single bond is smaller than for a nitrogen double bond c) The bond energy for a nitrogen single bond is larger than for a nitrogen double bond d) Both a and b e) Both a and c

Identify the shortest bond. A) triple covalent bond B) single covalent bond C) double covalent bond D) all of the above bonds are the same length

Select the compound with the shortest and strongest carbon-carbon bond.a. H2C=CH2b. C2H6c. H-C≡C-CH3d. H2C=C=CH2e. H3C-CH2-CH3

Which compound has the longest carbon-carbon bond length?A) CH3CH3B) CH2CH2C) HCCHD) all bond lengths are the same

In which of the following molecules is the carbon-carbon bond likely to be the strongest?a. H3CCH3b. H2CCH2c. CH3CH2Fd. HCCHe. H2CO

Which is the longest bond? A) N — N B) N ≡ N C) N = N D) All three bond lengths should be about the same

Which of the following has the longest bond?N2NO-N22+NO22-O22-

Which of the following diatomic molecules has the shortest bond length?A) N2B) O2C) F2D) Cl2E) Br2

Consider the following covalent bond radii:       Single      Double      Triple C     77 pm      67 pm      60 pmN     75 pm      60 pm      55 pmO     74 pm      60 pm        -S     102 pm        -             -What is the approximate length of the NN bond in nitrogen hydride (HNNH) using the table values?1. 150 pm2. 135 pm3. 110 pm4. 60 pm5. 55 pm6. 120 pm 

Consider the lattice energies of the following Group 2A compounds: BeH2, 3205 kJ/mol; MgH2, 2791 kJ/mol; CaH2, 2410 kJ/mol; SrH2, 2250 kJ/mol; BaH2, 2121 kJ/mol.Assuming that all of these compounds have the same three-dimensional arrangement of ions in the solid, which of these compounds has the shortest cation-anion distance?