Question 1

Which of the following statements best describes the difference between ionic and covalent compounds?

Accepted Answer

Ionic compounds are formed between metals and nonmetals with electron transfer, while covalent compounds are formed between nonmetals with electron sharing.

Question 2

What is the correct formula for a compound formed between calcium (Ca, Group 2) and nitrogen (N, Group 15)?

Accepted Answer

Ca$_2$N$_3$

Question 3

A magnesium atom (Mg) loses two electrons to form an ion. What is the charge and classification of this ion?

Accepted Answer

Mg$^{2+}$, cation

Question 4

Which of the following ions is correctly matched with its group number and charge?

Accepted Answer

Group 16: $-2$

Question 5

Lead (Pb) has a $+2$ charge and chlorine (Cl) has a $-1$ charge. What is the correct formula for the compound they form?

Accepted Answer

PbCl$_2$

Question 6

Which statement about the carbonate ion (CO$_3^{2-}$) is correct?

Accepted Answer

It contains one carbon atom, three oxygen atoms, and has a $-2$ charge.

Question 7

Which of the following best explains why charges must balance when forming ionic compounds?

Accepted Answer

To ensure the compound is electrically neutral.

Question 8

A student is asked to build the formula for aluminum oxide. Aluminum is in Group 13 and oxygen is in Group 16. What is the correct formula?

Accepted Answer

Al$_2$O$_3$

Question 9

Which of the following compounds is covalent?

Accepted Answer

CO$_2$

Question 10

Nitrogen trichloride (NCl$_3$) is formed by bonding nitrogen and chlorine. Which statement about its bonding is correct?

Accepted Answer

Each chlorine atom forms a single covalent bond with nitrogen.

Question 11

Which of the following best describes the behavior of molecules in covalent compounds?

Accepted Answer

Molecules exist independently and move freely, especially in liquids.

Question 12

If sodium (Na, Group 1) reacts with sulfur (S, Group 16), what is the correct formula for the resulting ionic compound?

Accepted Answer

Na$_2$S

Question 13

Which of the following is a correct step in determining the formula for an ionic compound?

Accepted Answer

Identify each element and its group number on the periodic table.

Question 14

A student is building the formula for potassium oxide. Potassium is in Group 1 and oxygen is in Group 16. What is the correct formula?

Accepted Answer

K$_2$O

Question 15

Which of the following is a real-world example of where the carbonate ion (CO$_3^{2-}$) is found?

Accepted Answer

Blood, bones, rocks, rivers, and shells

Question 16

What is the total number of valence electrons in a molecule of nitrogen trichloride (NCl$_3$)?

Accepted Answer

$26$

Question 17

Which of the following best describes the process of forming a cation?

Accepted Answer

An atom loses electrons, resulting in a positive charge.

Question 18

Why is it important to understand the process of building compounds rather than just memorizing formulas?

Accepted Answer

Understanding the process allows you to predict and construct new compounds correctly.

Question 19

Which of the following is true about the octet rule in covalent bonding?

Accepted Answer

Atoms share electrons to achieve eight electrons in their valence shell.

Question 20

A compound is formed between barium (Ba, Group 2) and fluorine (F, Group 17). What is the correct formula?

Accepted Answer

BaF$_2$

Chemical Formulas, Ion Charges, and Types of Compounds

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