Question 1

Which of the following statements best explains why water (H$$_2O) $$has properties dramatically different from its constituent elements, hydrogen and oxygen?

Accepted Answer

When hydrogen and oxygen combine to form water, a new compound is formed with entirely new properties due to chemical bonding.

Question 2

Which of the following compounds is an example of an ionic compound?

Accepted Answer

CuCl$$_2$$

Question 3

What is the empirical formula for glucose, C$$_6H$_{12}O$_6$$?

Accepted Answer

$$\mathrm{CH}_2\mathrm{O}$$

Question 4

Which statement correctly describes the difference between a molecular formula and an empirical formula?

Accepted Answer

The molecular formula shows the actual number of atoms of each element in a molecule, while the empirical formula shows the simplest whole-number ratio of those atoms.

Question 5

Which of the following elements can form an expanded octet in a Lewis structure?

Accepted Answer

Phosphorus (P)

Question 6

What is the correct formula for the ionic compound formed between calcium and chlorine?

Accepted Answer

$$\mathrm{CaCl}_2$$

Question 7

Which of the following compounds would be expected to have the highest lattice energy?

Accepted Answer

$$\mathrm{MgO}$$

Question 8

What is the name of the compound with the formula Fe$$_2O$_3$$?

Accepted Answer

Iron(III) oxide

Question 9

Which of the following is the correct name for the compound Na$$_2SO$_4$$?

Accepted Answer

Sodium sulfate

Question 10

What is the correct formula for magnesium cyanide?

Accepted Answer

$$\mathrm{Mg(CN)_2}$$

Question 11

Which of the following is the correct name for the hydrate CoCl$$_2$$·6H$$_2O$$?

Accepted Answer

Cobalt(II) chloride hexahydrate

Question 12

Which of the following compounds is a molecular compound?

Accepted Answer

CO$$_2$$

Question 13

What is the correct name for the molecular compound N$$_2O$_4$$?

Accepted Answer

Dinitrogen tetraoxide

Question 14

A compound is found to contain 43.64% phosphorus and 56.36% oxygen by mass. What is the empirical formula of the compound?

Accepted Answer

$$\mathrm{P}_2\mathrm{O}_5$$

Question 15

Which of the following pairs of molecules have the same empirical formula?

Accepted Answer

C$$_2H$_4$$ and C$$_3H$_6$$

Question 16

Butanedione has an empirical formula of C$$_2H$_3O $$and a molar mass of 86.09 g/mol. What is its molecular formula?

Accepted Answer

$$\mathrm{C}_4\mathrm{H}_6\mathrm{O}_2$$

Question 17

If the FDA recommends a daily sodium intake of 2.4 g, what mass of NaCl (in grams) can you consume within the guidelines? (Molar mass NaCl = 58.44 g/mol, Na = 22.99 g/mol)

Accepted Answer

6.09 g

Question 18

Which of the following best describes a triple covalent bond?

Accepted Answer

Two atoms share three pairs of electrons.

Question 19

Which of the following is the correct name for P$$_2O$_5$$?

Accepted Answer

Diphosphorus pentoxide

Chapter 4: Molecules and Compounds – Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards