Question 1

Which of the following best explains why PFAS compounds are difficult to break down in the environment?

Accepted Answer

They contain strong C-F bonds that require high energy to break.

Question 2

Which household product is most likely to contain PFAS based on its chemical properties?

Accepted Answer

Stain-resistant furniture

Question 3

What is the main difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the exchange of electrons, while covalent bonds involve the sharing of electrons.

Question 4

Which of the following is the correct formula for sodium chloride?

Accepted Answer

$\mathrm{NaCl}$

Question 5

Given the following ions: $\mathrm{Ca^{2+}}$ and $\mathrm{Cl^-}$, what is the correct formula for the compound they form?

Accepted Answer

$\mathrm{CaCl_2}$

Question 6

Which of the following ions is known as the hydronium ion?

Accepted Answer

$\mathrm{H_3O^+}$

Question 7

A mixture of hydrogen and oxygen gases is placed in a sealed container. Which statement is true about the ratio of hydrogen to oxygen in the mixture?

Accepted Answer

The ratio can vary and is not fixed.

Question 8

Which of the following is a covalent compound?

Accepted Answer

$\mathrm{H_2O}$

Question 9

What is the charge on the sulfate ion?

Accepted Answer

$-2$

Question 10

Which of the following is the correct name for $\mathrm{NO_3^-}$?

Accepted Answer

Nitrate ion

Question 11

Which of the following best describes the role of oxygen in combustion?

Accepted Answer

It is necessary for combustion to occur.

Question 12

Which of the following is a correct example of a polyatomic ion?

Accepted Answer

$\mathrm{PO_4^{3-}}$

Question 13

What is the correct name for $\mathrm{HCO_3^-}$?

Accepted Answer

Bicarbonate ion

Question 14

Which of the following is a real-world application of sodium bicarbonate?

Accepted Answer

Used as baking soda in households

Question 15

Which of the following best describes the process of mechanochemical PFAS destruction?

Accepted Answer

Breaking strong C-F bonds using mechanical energy and a solid reactant like CaO

Question 16

Which of the following is the correct formula for the compound formed between potassium ($\mathrm{K^+}$) and sulfate ($\mathrm{SO_4^{2-}}$)?

Accepted Answer

$\mathrm{K_2SO_4}$

Question 17

Which of the following is the correct name for $\mathrm{ClO_3^-}$?

Accepted Answer

Chlorate ion

Question 18

Which of the following is a correct example of a covalent bond?

Accepted Answer

The bond between two hydrogen atoms in $\mathrm{H_2}$

Question 19

Which of the following ions has a charge of $+1$?

Accepted Answer

$\mathrm{Na^+}$

Question 20

Which of the following is the correct formula for the compound formed between aluminum ($\mathrm{Al^{3+}}$) and sulfate ($\mathrm{SO_4^{2-}}$)?

Accepted Answer

$\mathrm{Al_2(SO_4)_3}$

Introduction to Chemical Compounds: Ionic and Covalent Bonds, PFAS, and Common Ions

Study Guide - Practice Questions