Question 1

Which of the following best explains why chemical bonds form between atoms?

Accepted Answer

To lower the potential energy of the charged particles (electrons and protons) that compose atoms.

Question 2

Which type of bond is most likely to form between a sodium atom (Na) and a chlorine atom (Cl)?

Accepted Answer

Ionic bond, because sodium is a metal and chlorine is a nonmetal.

Question 3

A sample of water is always found to contain 11.2% hydrogen and 88.8% oxygen by mass. Which law does this observation illustrate?

Accepted Answer

Law of Definite Proportion

Question 4

Which of the following is the empirical formula for a compound with the molecular formula $$C_6H_{12}O_6$?

Accepted Answer

$$CH_2O$$

Question 5

Which statement correctly distinguishes between a molecular formula and an empirical formula?

Accepted Answer

A molecular formula shows the actual number of atoms of each element in a molecule, while an empirical formula shows the simplest whole-number ratio of atoms.

Question 6

Which of the following best describes the structure of an ionic compound in the solid phase?

Accepted Answer

A regular three-dimensional array (lattice) of alternating cations and anions.

Question 7

Which of the following is a correct structural formula for water?

Accepted Answer

$$H-O-H$$

Question 8

If a compound has the molecular formula $$B_2H_6$$, what is its empirical formula?

Accepted Answer

$$BH_3$$

Question 9

Which of the following best describes what the spheres in a space-filling molecular model represent?

Accepted Answer

The electron cloud of the atom.

Question 10

Which of the following compounds is composed of covalent bonds?

Accepted Answer

CO$$_2$$

Question 11

A student is given the molecular formula $$C_2H_4O_2$$ for acetic acid. What is the empirical formula?

Accepted Answer

$$CH_2O$$

Question 12

Which of the following statements about molecular and empirical formulas is correct?

Accepted Answer

The empirical formula may be the same as the molecular formula for some compounds.

Question 13

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between two nonmetal atoms.

Question 14

Which of the following is the correct empirical formula for a compound with the molecular formula $$CCl_4$$?

Accepted Answer

$$CCl_4$$

Question 15

Which of the following best explains why water ($$H_2O) is a $$compound and not a mixture?

Accepted Answer

Water always has a fixed ratio of two hydrogen atoms to one oxygen atom.

Question 16

Which of the following is NOT a correct representation of a compound?

Accepted Answer

Atomic number

Question 17

Which of the following best describes the information conveyed by a structural formula?

Accepted Answer

It shows the type, actual number, and arrangement of atoms in a molecule.

Question 18

Which of the following is a real-world example of a covalent compound?

Accepted Answer

Carbon dioxide (CO$$_2)$$

Question 19

Which of the following best describes the process that occurs when a metal reacts with a nonmetal to form an ionic compound?

Accepted Answer

The metal atom transfers one or more electrons to the nonmetal atom.

Question 20

Which of the following statements about Lewis structures is correct?

Accepted Answer

Lewis structures represent valence electrons as dots around the chemical symbol.

lecture 14

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