Question 1

Which of the following statements best explains why water (H2O) is a liquid at room temperature while hydrogen (H2) and oxygen (O2) are gases?

Accepted Answer

Water has stronger intermolecular forces due to hydrogen bonding, resulting in a higher boiling point.

Question 2

Which formula represents the empirical formula for hydrogen peroxide (H2O2)?

Accepted Answer

$\mathrm{HO}$

Question 3

What is the correct name for the compound Fe2S3?

Accepted Answer

Iron(III) sulfide

Question 4

Which of the following is a polyatomic ion?

Accepted Answer

$\mathrm{NO_3^-}$

Question 5

What is the formula mass of methane ($\mathrm{CH_4}$)? (Atomic masses: C = 12.01 amu, H = 1.01 amu)

Accepted Answer

$\mathrm{16.05\ amu}$

Question 6

Which of the following compounds is classified as a molecular compound?

Accepted Answer

$\mathrm{CO_2}$

Question 7

What is the correct systematic name for $\mathrm{MgSO_4 \cdot 7H_2O}$?

Accepted Answer

Magnesium sulfate heptahydrate

Question 8

Which of the following is the correct formula for cobalt(II) phosphate?

Accepted Answer

$\mathrm{Co_3(PO_4)_2}$

Question 9

A compound is found to contain 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is its empirical formula?

Accepted Answer

$\mathrm{CH_2O}$

Question 10

Which of the following is the correct name for $\mathrm{HNO_2}$?

Accepted Answer

Nitrous acid

Question 11

What is the correct formula for rubidium sulfide?

Accepted Answer

$\mathrm{Rb_2S}$

Question 12

Which of the following is a binary molecular compound?

Accepted Answer

$\mathrm{CO_2}$

Question 13

What is the correct name for $\mathrm{P_4S_{10}}$?

Accepted Answer

Tetraphosphorus decasulfide

Question 14

Which of the following is the correct formula for lithium dichromate?

Accepted Answer

$\mathrm{Li_2Cr_2O_7}$

Question 15

Which of the following is the correct formula for the acid named hydrofluoric acid?

Accepted Answer

$\mathrm{HF}$

Question 16

A sample of maleic acid has an empirical formula of $\mathrm{C_2H_2O_3}$ and a molar mass of 116 g/mol. What is its molecular formula?

Accepted Answer

$\mathrm{C_4H_4O_6}$

Question 17

Which of the following is the correct name for $\mathrm{PbCl_4}$?

Accepted Answer

Lead(IV) chloride

Question 18

Which of the following is the correct formula for ammonium sulfate?

Accepted Answer

$\mathrm{(NH_4)_2SO_4}$

Question 19

Which of the following is the correct formula for ethyne?

Accepted Answer

$\mathrm{C_2H_2}$

Question 20

Which of the following statements about acids is correct?

Accepted Answer

Acids are molecular compounds that release hydrogen ions ($\mathrm{H^+}$) when dissolved in water.

Chapter 3: Molecules, Compounds, and Chemical Equations – Structured Study Notes

Study Guide - Practice Questions