Question 1

Which of the following best describes the electron geometry and molecular geometry of carbon dioxide ($$\mathrm{CO_2$}$$)?

Accepted Answer

Electron geometry: linear; Molecular geometry: linear

Question 2

How many bonding electrons are present in the Lewis structure of nitrogen gas ($$\mathrm{N_2$}$$)?

Accepted Answer

$$6$$

Question 3

Which of the following molecules is polar and has a bent molecular geometry?

Accepted Answer

$$\mathrm{H_2O}$$

Question 4

What is the approximate bond angle in a molecule with tetrahedral electron geometry?

Accepted Answer

$$109.5^\circ$$

Question 5

Which of the following elements is most likely to form an ion with a $$2+$$ charge?

Accepted Answer

Magnesium ($$\mathrm{Mg})$$

Question 6

A molecule has three bonding pairs and one lone pair around the central atom. What is its molecular geometry?

Accepted Answer

Trigonal pyramidal

Question 7

Which of the following best describes the term 'electronegativity'?

Accepted Answer

The ability of an atom to attract electrons within a covalent bond

Question 8

Which of the following molecules does NOT have resonance structures?

Accepted Answer

$$\mathrm{H_2O}$$

Question 9

How many valence electrons are present in the Lewis structure of $$\mathrm{$$CCl_4$$}$$?

Accepted Answer

$$32$$

Question 10

Which of the following compounds is both linear in molecular geometry and polar?

Accepted Answer

$$\mathrm{CO}$$

Question 11

What is the formula for the compound formed between aluminum and bromine?

Accepted Answer

$$\mathrm{$$AlBr_3$$}$$

Question 12

Which of the following best represents the Lewis structure for the cyanide ion ($$\mathrm{CN^-}$$)?

Accepted Answer

:C\equiv N:^{-}

Question 13

Which symbol should be used between two resonance structures to indicate resonance?

Accepted Answer

$$\leftrightarrow$$

Question 14

Which of the following molecules has a trigonal planar electron geometry?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 15

How many lone pairs are on the central atom in the Lewis structure of $$\mathrm{NH_3$}$$?

Accepted Answer

$$1$$

Question 16

Which of the following best explains why $$\mathrm{CO_2$} is a $$nonpolar molecule even though it contains polar bonds?

Accepted Answer

The molecule is linear and the bond dipoles cancel each other out

Question 17

Which of the following elements is found in Group 17 (halogens) of the periodic table?

Accepted Answer

Bromine ($$\mathrm{Br})$$

Question 18

How many total electrons are shared in the Lewis structure of $$\mathrm{O_2$}$$?

Accepted Answer

$$4$$

Question 19

Which of the following molecules has a square planar molecular geometry?

Accepted Answer

$$\mathrm{$$XeF_4$$}$$

Question 20

Which of the following statements about the periodic table is correct?

Accepted Answer

Electronegativity increases from left to right across a period

Chemical Bonding and Molecular Geometry: Study Notes for Chapter 10

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