Science: Naming Chemical Compounds Worksheet

Question 1

Write the correct name for the ionic compound NaCl.

Accepted Answer

The correct name for NaCl is sodium chloride. Sodium forms a positive ion and chlorine forms the chloride ion.

Question 2

Write the correct chemical formula for calcium oxide.

Accepted Answer

The correct formula for calcium oxide is CaO. Calcium forms a 2+ ion and oxide forms a 2- ion, so they combine in a 1:1 ratio.

Question 3

Write the correct name for FeCl3.

Accepted Answer

The correct name for FeCl3 is iron(III) chloride. Each chloride ion has a 1- charge, so three chloride ions require an iron ion with a 3+ charge.

Question 4

Write the correct chemical formula for aluminum sulfide.

Accepted Answer

The correct formula for aluminum sulfide is Al2S3. Aluminum forms a 3+ ion and sulfide forms a 2- ion, so the charges balance with 2 aluminum ions and 3 sulfide ions.

Question 5

Write the correct name for CO2.

Accepted Answer

The correct name for CO2 is carbon dioxide. The prefix di- shows that there are two oxygen atoms.

Question 6

Write the correct chemical formula for dinitrogen pentoxide.

Accepted Answer

The correct formula for dinitrogen pentoxide is N2O5. The prefix di- means 2 nitrogen atoms and penta- means 5 oxygen atoms.

Question 7

Write the correct name for Cu2O.

Accepted Answer

The correct name for Cu2O is copper(I) oxide. Oxide has a 2- charge, so each of the two copper ions must have a 1+ charge.

Question 8

Write the correct chemical formula for magnesium nitrate.

Accepted Answer

The correct formula for magnesium nitrate is Mg(NO3)2. Magnesium forms a 2+ ion and nitrate is a 1- polyatomic ion, so two nitrate ions are needed.

Question 9

Write the correct name for N2O4.

Accepted Answer

The correct name for N2O4 is dinitrogen tetroxide. The prefix di- shows 2 nitrogen atoms, and tetra- becomes tetr- before oxide.

Question 10

Write the correct chemical formula for iron(III) hydroxide.

Accepted Answer

The correct formula for iron(III) hydroxide is Fe(OH)3. Iron(III) is Fe3+ and hydroxide is OH1-, so three hydroxide ions are needed to balance the charge.

Question 11

Write the correct name for NH4Cl.

Accepted Answer

The correct name for NH4Cl is ammonium chloride. NH4+ is the ammonium ion and Cl- is the chloride ion.

Question 12

Write the correct chemical formula for sulfur hexafluoride.

Accepted Answer

The correct formula for sulfur hexafluoride is SF6. The prefix hexa- shows that there are 6 fluorine atoms bonded to sulfur.

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Science: Naming Chemical Compounds

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