Question 1

Which of the following best describes the difference between a compound and a molecule?

Accepted Answer

A compound is a group of atoms in a fixed ratio, while a molecule specifically refers to atoms held together by shared electrons.

Question 2

Which of the following is the correct empirical formula for a compound containing 2 sodium atoms and 2 chlorine atoms?

Accepted Answer

$$\mathrm{NaCl}$$

Question 3

When writing the chemical formula for a compound containing hydrogen and oxygen, which element is listed first and why?

Accepted Answer

Hydrogen, because it is more metallic than oxygen.

Question 4

Which of the following best explains why sodium and chlorine form an ionic compound?

Accepted Answer

Sodium loses an electron to become $$\mathrm{Na^+}$$ and chlorine gains an electron to become $$\mathrm{Cl^-}$$, resulting in electrostatic attraction.

Question 5

A sample contains $$0.25$$ moles of $$\mathrm{H_2O}. $$How many hydrogen atoms are present in the sample? (Avogadro's number $$= 6.022 	imes 10$$^{23}$$)

Accepted Answer

$$7.5 	imes 10$$^{23}$$

Question 6

Which of the following is the correct name for $$\mathrm{$$FeCl_2$$}$$?

Accepted Answer

Iron(II) chloride

Question 7

What is the correct formula for magnesium bromide, given that magnesium forms a $$2^+$$ ion and bromine forms a $$1^-$$ ion?

Accepted Answer

$$\mathrm{$$MgBr_2$$}$$

Question 8

Which of the following is a polyatomic ion?

Accepted Answer

$$\mathrm{CO_3$^{2-}}$$

Question 9

What is the correct name for $$\mathrm{H_2SO_4}$$?

Accepted Answer

Sulfuric acid

Question 10

Which of the following best describes the octet rule?

Accepted Answer

Most main group elements gain, lose, or share electrons to achieve a full valence shell of eight electrons.

Question 11

Which of the following molecules contains a triple bond?

Accepted Answer

$$\mathrm{N_2$}$$

Question 12

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity quantifies the ability of an atom in a bond to attract the bonding electrons.

Question 13

Which of the following best explains why $$\mathrm{H_2O} is a $$polar molecule?

Accepted Answer

Oxygen is more electronegative than hydrogen, creating a partial negative charge on oxygen and a partial positive charge on hydrogen.

Question 14

Which of the following is the correct Lewis structure for carbon dioxide ($$\mathrm{CO_2$}$$)?

Accepted Answer

O=C=O

Question 15

A student is asked to draw the Lewis structure for $$\mathrm{NO_3$^-}. $$How many total valence electrons should be used?

Accepted Answer

24

Question 16

Which of the following is the correct formula for dinitrogen tetroxide?

Accepted Answer

$$\mathrm{N_2O_4}$$

Question 17

Which of the following best describes a resonance structure?

Accepted Answer

A Lewis structure that is one of two or more valid representations of a molecule, differing only in the placement of electrons.

Question 18

Which of the following is the correct name for $$\mathrm{NH_4Cl}$$?

Accepted Answer

Ammonium chloride

Question 19

Which of the following is a correct statement about the formation of ionic compounds?

Accepted Answer

The total positive charge must equal the total negative charge, resulting in a neutral compound.

Question 20

Which of the following is the correct name for $$\mathrm{K_2SO_4}$$?

Accepted Answer

Potassium sulfate

Chapter 4: Basic Chemical Bonding – Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard