Question 1

Which of the following statements best explains why the properties of table sugar (sucrose, $\mathrm{C_{12}H_{22}O_{11}}$) are different from those of its component elements?

Accepted Answer

When elements combine to form a compound, they do so in fixed ratios and the resulting compound has unique properties distinct from its elements.

Question 2

According to the Law of Constant Composition, which of the following is true for any pure sample of water?

Accepted Answer

The mass ratio of oxygen to hydrogen is always $8.0:1$.

Question 3

Which of the following best distinguishes a compound from a mixture?

Accepted Answer

A compound has a fixed, definite proportion of elements, while a mixture has variable proportions.

Question 4

If you change the subscript in the chemical formula $\mathrm{CO}$ to $\mathrm{CO_2}$, what is the result?

Accepted Answer

You have created a completely different compound with different properties.

Question 5

Which of the following is the correct empirical formula for hydrogen peroxide, given its molecular formula is $\mathrm{H_2O_2}$?

Accepted Answer

$\mathrm{HO}$

Question 6

How many oxygen atoms are present in one formula unit of $\mathrm{Mg(NO_3)_2}$?

Accepted Answer

6

Question 7

Which of the following substances is classified as a molecular element?

Accepted Answer

Chlorine gas ($\mathrm{Cl_2}$)

Question 8

Which of the following is the correct chemical formula for the ionic compound formed between magnesium and chlorine?

Accepted Answer

$\mathrm{MgCl_2}$

Question 9

What is the correct name for the compound $\mathrm{FeCl_3}$?

Accepted Answer

Iron(III) chloride

Question 10

Which of the following is the correct name for $\mathrm{KNO_3}$?

Accepted Answer

Potassium nitrate

Question 11

What is the correct formula for ammonium sulfate?

Accepted Answer

$\mathrm{(NH_4)_2SO_4}$

Question 12

Which of the following is the correct name for $\mathrm{N_2O_5}$?

Accepted Answer

Dinitrogen pentoxide

Question 13

Which of the following is the correct name for $\mathrm{H_2SO_4}$ (aq)?

Accepted Answer

Sulfuric acid

Question 14

A sample of ammonia ($\mathrm{NH_3}$) is decomposed and found to contain 14.0 g of nitrogen and 3.0 g of hydrogen. What is the mass ratio of nitrogen to hydrogen in ammonia?

Accepted Answer

$4.7:1$

Question 15

Which of the following best describes the basic unit of an ionic compound?

Accepted Answer

A formula unit composed of cations and anions in a 3D array

Question 16

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

Accepted Answer

Nitrous acid

Question 17

Which of the following is the correct formula for calcium phosphate?

Accepted Answer

$\mathrm{Ca_3(PO_4)_2}$

Question 18

Which of the following is a correct statement about naming binary molecular compounds?

Accepted Answer

The more metal-like element is named first, and prefixes indicate the number of each atom.

Question 19

Which of the following is the correct name for $\mathrm{NaClO}$, the active ingredient in household bleach?

Accepted Answer

Sodium hypochlorite

Question 20

A compound contains 2 atoms of aluminum and 3 groups of sulfate ($\mathrm{SO_4^{2-}}$). What is its correct chemical formula?

Accepted Answer

$\mathrm{Al_2(SO_4)_3}$

Chapter 5: Molecules and Compounds – Study Notes for Introductory Chemistry

Study Guide - Practice Questions

Study Guide - Flashcards