Question 1

Which statement best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the complete transfer of electrons between atoms with very different electronegativities, while covalent bonds involve the sharing of electrons between atoms with similar electronegativities.

Question 2

What is the electronic configuration of a neutral carbon atom?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^2$$

Question 3

Which of the following pairs of elements is most likely to form an ionic bond?

Accepted Answer

Lithium and Fluorine

Question 4

What is the main reason atoms form chemical bonds?

Accepted Answer

To achieve a stable noble gas electron configuration

Question 5

Which of the following molecules contains a bond with the greatest polarity?

Accepted Answer

HF

Question 6

How many valence electrons does a neutral nitrogen atom have?

Accepted Answer

5

Question 7

Which of the following best explains why fluorine has a higher electronegativity than lithium?

Accepted Answer

Fluorine has more protons and is closer to filling its valence shell, so it attracts electrons more strongly.

Question 8

When drawing Lewis structures, what is the first step you should take?

Accepted Answer

Count the total number of valence electrons for all atoms in the molecule.

Question 9

Which of the following ions has the same electron configuration as neon?

Accepted Answer

F$$^-$$

Question 10

A molecule of ammonia (NH$$_3) $$has how many lone pairs of electrons on the central atom?

Accepted Answer

1

Question 11

Which statement about the octet rule is correct?

Accepted Answer

Atoms tend to gain, lose, or share electrons to achieve eight electrons in their valence shell, similar to noble gases.

Question 12

What is the formal charge on the oxygen atom in a hydroxide ion (OH$$^-$$)?

Accepted Answer

$$-1$$

Question 13

Which of the following best describes a lone pair?

Accepted Answer

A pair of electrons located on a single atom and not involved in bonding.

Question 14

Which of the following is the correct electron configuration for a fluoride ion (F$$^-$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$

Question 15

Which of the following molecules is most likely to have a central atom with an incomplete octet?

Accepted Answer

BF$$_3$$

Question 16

What is the total number of valence electrons in a molecule of carbon dioxide (CO$$_2$$)?

Accepted Answer

16

Question 17

Which of the following best explains why ionic solids have high melting points?

Accepted Answer

They have strong electrostatic attractions between oppositely charged ions.

Question 18

In the reaction between lithium and fluorine to form LiF, which atom loses electrons and which gains electrons?

Accepted Answer

Lithium loses electrons and fluorine gains electrons.

Question 19

Which of the following is the best definition of electronegativity (EN)?

Accepted Answer

The ability of an atom to attract electrons in a chemical bond.

Question 20

Which of the following statements about the formation of urea from ammonium cyanate is correct?

Accepted Answer

It demonstrates the conversion of an inorganic compound to an organic compound.

Introduction to Organic Chemistry: Atomic Structure, Bonding, and Lewis Theory

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