Question 1

Which of the following statements best distinguishes an element from a compound?

Accepted Answer

A compound consists of two or more elements chemically combined in a fixed ratio, while an element is a pure substance made of only one type of atom.

Question 2

Which of the following is a molecular compound?

Accepted Answer

CO$$_2$$

Question 3

A student is given a white crystalline solid that dissolves in water to form a solution that conducts electricity. Based on this observation, the solid is most likely:

Accepted Answer

An ionic compound

Question 4

Which of the following correctly names the compound with the formula $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 5

What is the correct formula for magnesium nitrate?

Accepted Answer

$$\mathrm{Mg(NO_3$)_2}$$

Question 6

Which of the following compounds is named correctly?

Accepted Answer

$$\mathrm{Na_2SO_4}$$: Sodium sulfate

Question 7

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

Accepted Answer

Dinitrogen pentoxide

Question 8

A patient is prescribed potassium chloride as a supplement. What is the correct chemical formula for potassium chloride?

Accepted Answer

$$\mathrm{KCl}$$

Question 9

Which of the following compounds contains both ionic and covalent bonds?

Accepted Answer

$$\mathrm{$$NaNO_3$$}$$

Question 10

What is the correct name for $$\mathrm{$$CuSO_4$$}$$?

Accepted Answer

Copper(II) sulfate

Question 11

Which of the following formulas represents a binary ionic compound?

Accepted Answer

$$\mathrm{$$CaCl_2$$}$$

Question 12

Which of the following is the correct name for $$\mathrm{$$PCl_5$$}$$?

Accepted Answer

Phosphorus pentachloride

Question 13

A compound is named sodium carbonate. Which of the following is its correct formula?

Accepted Answer

$$\mathrm{Na_2CO_3}$$

Question 14

Which of the following is the correct name for $$\mathrm{Al_2$(SO_4$)_3}$$?

Accepted Answer

Aluminum sulfate

Question 15

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

Accepted Answer

Ionic compounds consist of ions held together by electrostatic forces, while molecular compounds consist of molecules held together by covalent bonds.

Question 16

What is the correct name for $$\mathrm{NH_4NO_3}$$, a common fertilizer?

Accepted Answer

Ammonium nitrate

Question 17

Which of the following is the correct formula for calcium phosphate, a compound found in bones?

Accepted Answer

$$\mathrm{Ca_3$(PO_4$)_2}$$

Question 18

A sample contains only molecules of $$\mathrm{SO_2$}. $$Which of the following best describes this sample?

Accepted Answer

A pure compound

Question 19

Which of the following is the correct name for $$\mathrm{K_2SO_4}$$?

Accepted Answer

Potassium sulfate

Question 20

Which of the following is the correct formula for dinitrogen tetroxide?

Accepted Answer

$$\mathrm{N_2O_4}$$

Elements, Compounds, and Chemical Nomenclature

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