Question 1

Which of the following bonds is the most polar covalent bond?

Accepted Answer

$$\mathrm{O-H}$$

Question 2

Which of the following ions or atoms has the largest atomic radius?

Accepted Answer

$$\mathrm{I^-}$$

Question 3

Which element below has the largest first ionization energy?

Accepted Answer

Neon

Question 4

Given the empirical formula of ascorbic acid is $$\mathrm{C_3H_4O_3}$$ and its molecular weight is $$176.13\ \mathrm{g/mol}$$, what is its molecular formula?

Accepted Answer

$$\mathrm{C_6H_8O_6}$$

Question 5

What is the hybridization of the central carbon atom in formaldehyde ($$\mathrm{H_2CO}$$)?

Accepted Answer

$$\mathrm{sp^2$}$$

Question 6

A 12 oz can of Red Bull contains 111 mg of caffeine ($$\mathrm{C_8H_{10}N_4O_2}). If $$you consume seven cans, how many molecules of caffeine have you ingested? (Molar mass of caffeine = $$194.19\ \mathrm{g/mol}$$, $$N_A = 6.022 	imes 10$$^{23}$$)

Accepted Answer

$$2.41 	imes 10$$^{21}$$

Question 7

Which of the following best describes the electron geometry and molecular geometry of ammonia ($$\mathrm{NH_3$}$$)?

Accepted Answer

Electron geometry: tetrahedral; Molecular geometry: trigonal pyramidal

Question 8

Which of the following statements about resonance structures is correct?

Accepted Answer

Resonance structures differ only in the arrangement of electrons.

Question 9

What is the bond order of cyanide ($$\mathrm{CN^-}) $$based on its molecular orbital diagram?

Accepted Answer

3

Question 10

Which of the following best explains why $$\mathrm{$$XeCl_4$$} is $$nonpolar?

Accepted Answer

The molecule has polar bonds but a square planar geometry, so the dipoles cancel.

Question 11

A combustion analysis of a 5.00 g sample of styrene produces $$0.0169 kg of$$ $$\mathrm{CO_2$}$$ and $$3.46 mL of$$ $$\mathrm{H_2O} ($$density $$= 1.00\ \mathrm{g/mL}). $$What is the empirical formula of styrene?

Accepted Answer

$$\mathrm{C_8H_8}$$

Question 12

Which of the following atoms has the most negative electron affinity?

Accepted Answer

Sulfur

Question 13

Which of the following best describes the hybridization of the central atom in $$\mathrm{$$XeCl_4$$}$$?

Accepted Answer

$$\mathrm{sp^3$d^2$$}$

Question 14

Which of the following is the correct Lewis structure for $$\mathrm{N_3$^-}$$?

Accepted Answer

A linear structure with one triple bond, one single bond, and a negative charge on an end N

Question 15

Which of the following best describes the types of bonds in $$\mathrm{H_2CO} ($$formaldehyde)?

Accepted Answer

2 $$\sigma C-H$$, 1 $$\sigma C=O$$, 1 $$\pi C=O$$

Exam 2 Study Guide: Chemical Bonding, Molecular Structure, and Quantitative Chemistry

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