Formula Writing And Naming Compounds
This 40-item test will measure how well you understood the rules in writing down the correct chemical formulas of compounds as well as naming compounds given the chemical formulas. You have 30 minutes to complete the test.
*Numbers are always treated as subscripts. *Mispelled words / Incorrectly entered answers are marked wrong.
Questions and Answers
- 1.
Multiple Choice: Name the compound CaF2
- A.
Calcium difluoride
- B.
Calcium bifluoride
- C.
Calcium fluoride
- D.
Calcium fluorine
Correct Answer
C. Calcium fluorideExplanation
The compound CaF2 is named calcium fluoride because it consists of one calcium ion (Ca2+) and two fluoride ions (F-). The name is determined by combining the name of the cation (calcium) and the name of the anion (fluoride), with the suffix "-ide" added to the anion name. Therefore, the correct name for CaF2 is calcium fluoride.Rate this question:
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- 2.
Multiple Choice: Name the compound CS4
- A.
Carbon sulfide
- B.
Monocarbon tetrasulfide
- C.
Carbon tetrasulfide
- D.
Monocarbon sulfide
Correct Answer
C. Carbon tetrasulfideExplanation
The compound CS4 is named carbon tetrasulfide because it consists of one carbon atom bonded to four sulfur atoms. The prefix "tetra-" indicates the presence of four sulfur atoms, and "sulfide" indicates the presence of sulfur. The name "carbon" specifies the element that is bonded to the sulfur atoms. Therefore, the correct answer is carbon tetrasulfide.Rate this question:
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- 3.
Multiple Choice: Name the compound HMnO4
- A.
Permanganic acid
- B.
Manganic acid
- C.
Hydromanganic acid
- D.
Hydropermanganic acid
Correct Answer
A. Permanganic acidExplanation
The compound HMnO4 is named permanganic acid. This is because the compound contains the element manganese (Mn) and has a -1 oxidation state for the hydrogen ion (H), resulting in the formula HMnO4. The prefix "per-" indicates that the compound has one more oxygen atom than the related compound manganic acid, which is why it is named permanganic acid.Rate this question:
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- 4.
Multiple Choice: Name the compound ZnS
- A.
Zinc sulfur
- B.
Monozinc sulfide
- C.
Monozinc monosulfide
- D.
Zinc sulfide
Correct Answer
D. Zinc sulfideExplanation
The compound ZnS is named zinc sulfide because it consists of zinc (Zn) and sulfur (S) atoms. The name follows the convention of using the element's name followed by the root of the non-metal element with the suffix "-ide" to indicate a binary compound.Rate this question:
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- 5.
Multiple Choice: Name the compound AlPO5
- A.
Aluminum perphosphate
- B.
Aluminum phosphate
- C.
Aluminum phosphite
- D.
Aluminum hypophosphite
Correct Answer
A. Aluminum perpHospHate -
- 6.
Multiple Choice: Name the compound KNO2
- A.
Potassium hyponitrite
- B.
Potassium nitrite
- C.
Potassium nitrate
- D.
Potassium pernitrate
Correct Answer
B. Potassium nitriteExplanation
The compound KNO2 is named potassium nitrite.Rate this question:
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- 7.
Multiple Choice: Name the compound Sn(OH)4
- A.
Tin (IV) hydroxide
- B.
Tin hydroxide
- C.
Stannous hydroxide
- D.
Tin (II) hydroxide
Correct Answer
A. Tin (IV) hydroxideExplanation
The correct answer is tin (IV) hydroxide. This is because the compound Sn(OH)4 contains tin (Sn) in its highest oxidation state, which is +4. The Roman numeral IV indicates the oxidation state of tin. Hydroxide (OH) is a polyatomic ion with a charge of -1, and since there are four hydroxide ions in the compound, the overall charge of the compound is -4. Therefore, the correct name for this compound is tin (IV) hydroxide.Rate this question:
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- 8.
Multiple Choice: Name the compound NH4HCO3
- A.
Ammonium hydrocarbonate
- B.
Ammonium carbonate
- C.
Ammonium tricarbonate
- D.
Ammonium bicarbonate
Correct Answer
D. Ammonium bicarbonateExplanation
NH4HCO3 is the chemical formula for ammonium bicarbonate. This compound is formed by the combination of ammonium ions (NH4+) and bicarbonate ions (HCO3-). The name "ammonium bicarbonate" accurately reflects the composition of the compound, with "ammonium" indicating the presence of the ammonium ion and "bicarbonate" indicating the presence of the bicarbonate ion. The other options listed in the question do not accurately represent the composition of NH4HCO3.Rate this question:
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- 9.
Multiple Choice: Name the compound Pb3(BO3)4
- A.
Lead borate
- B.
Lead perborate
- C.
Lead (IV) borate
- D.
Lead (IV) perborate
Correct Answer
C. Lead (IV) borateExplanation
The correct answer is lead (IV) borate. This compound is named using the Stock system for naming compounds, which involves indicating the oxidation state of the metal ion in parentheses after its name. In this case, the oxidation state of lead is +4, so it is named lead (IV) borate.Rate this question:
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- 10.
Multiple Choice: Name the compound C3H8
- A.
Carbon hydrogen
- B.
Carbon hydride
- C.
Tricarbon octahydride
- D.
Carbon octahydride
Correct Answer
C. Tricarbon octahydrideExplanation
The compound C3H8 is named tricarbon octahydride because it consists of three carbon atoms and eight hydrogen atoms. The prefix "tri-" indicates the presence of three carbon atoms, and the prefix "octa-" indicates the presence of eight hydrogen atoms. Therefore, tricarbon octahydride is the correct name for this compound.Rate this question:
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- 11.
Identification: Name the compound MgO2
Correct Answer
magnesium peroxideExplanation
MgO2 is named magnesium peroxide because it consists of magnesium (Mg) and oxygen (O) atoms. The subscript 2 in the formula indicates that there are two oxygen atoms present for every magnesium atom. Therefore, the compound is named magnesium peroxide.Rate this question:
- 12.
Identification: Name the compound HBrO
Correct Answer
hypobromous acidExplanation
HBrO is the chemical formula for hypobromous acid. Hypobromous acid is a weak acid that is formed when bromine reacts with water. It is a powerful oxidizing agent and is commonly used as a disinfectant. Hypobromous acid is also used in organic synthesis and as a bleaching agent.Rate this question:
- 13.
Identification: Name the compound Li3N
Correct Answer
lithium nitrideExplanation
Li3N is the chemical formula for lithium nitride. In this compound, three lithium atoms are bonded to one nitrogen atom. The name "lithium nitride" accurately describes the composition of the compound, with "lithium" representing the lithium atoms and "nitride" representing the nitrogen atom.Rate this question:
- 14.
Identification: Name the compound NaClO
Correct Answer
sodium hypochloriteExplanation
The compound NaClO is called sodium hypochlorite.Rate this question:
- 15.
Identification: Name the compound P2O3
Correct Answer
diphosphorus trioxideExplanation
The compound P2O3 is named diphosphorus trioxide. The prefix "di-" indicates that there are two phosphorus atoms in the compound, and the prefix "tri-" indicates that there are three oxygen atoms. Therefore, the correct name for P2O3 is diphosphorus trioxide.Rate this question:
- 16.
Identification: Name the compound Cr2(CO3)3 . 4H2O
Correct Answer
chromium (III) carbonate tetrahydrate
chromic carbonate tetrahydrateExplanation
The compound Cr2(CO3)3 . 4H2O is named chromium (III) carbonate tetrahydrate or chromic carbonate tetrahydrate. This is because it contains chromium (III) ions (Cr3+) bonded to carbonate ions (CO3^2-) and four water molecules (H2O). The use of "chromium (III)" indicates the oxidation state of the chromium ion, while "carbonate" indicates the presence of carbonate ions in the compound. The term "tetrahydrate" specifies that there are four water molecules associated with each formula unit of the compound.Rate this question:
- 17.
Identification: Name the compound Fe2O3
Correct Answer
iron (III) oxide, iron oxide, ferric oxideExplanation
The compound Fe2O3 is commonly known as iron (III) oxide or ferric oxide. This name is derived from the fact that it consists of two iron (Fe) atoms bonded to three oxygen (O) atoms. The Roman numeral III in the name indicates that the iron atom has a +3 oxidation state, which is characteristic of the compound. Iron (III) oxide is a reddish-brown solid that is commonly found in nature as the mineral hematite. It is used in various applications, including as a pigment, in the production of steel, and as a catalyst.Rate this question:
- 18.
Identification: Name the compound AgNO3
Correct Answer
silver nitrateExplanation
The compound AgNO3 is named silver nitrate. This is because it consists of silver (Ag) and nitrate (NO3) ions. The cation (Ag+) is named first, followed by the anion (NO3-), with the suffix -ate indicating that it is a polyatomic ion. Therefore, the correct name for AgNO3 is silver nitrate.Rate this question:
- 19.
Identification: Name the compound SnSiO5
Correct Answer
stannic persilicate
tin (IV) persilicateExplanation
The compound SnSiO5 is known as stannic persilicate or tin (IV) persilicate. This compound is made up of tin (IV) ions (Sn4+) and persilicate ions (SiO5^4-). The use of the term "stannic" indicates that the tin ion is in its highest oxidation state of +4. Persilicate refers to the presence of the silicate ion (SiO5^4-), which is a polyatomic ion composed of silicon and oxygen atoms. Therefore, stannic persilicate or tin (IV) persilicate accurately describes the composition and oxidation state of the compound SnSiO5.Rate this question:
- 20.
Identification: Name the compound NaHSO4
Correct Answer
sodium bisulfate, sodium hydrogen sulfateExplanation
Sodium bisulfate (NaHSO₄) consists of sodium (Na⁺) and the bisulfate (HSO₄⁻) ion. It is often used in various applications, including as a pH adjuster in pools and a cleaning agent. The compound features a hydrogen sulfate ion, hence the alternative name sodium hydrogen sulfate. Understanding chemical nomenclature helps in identifying the composition and potential uses of compounds in different contexts.Rate this question:
- 21.
Multiple Choice: What is the correct chemical formula of the compound copper (II) oxide?
- A.
CuO
- B.
Cu2O
- C.
Cu2O2
- D.
CuO2
Correct Answer
A. CuOExplanation
The correct chemical formula for the compound copper (II) oxide is CuO. Copper (II) indicates that the copper ion has a charge of +2, and oxide indicates that the oxygen ion has a charge of -2. Therefore, to balance the charges, one copper ion combines with one oxygen ion to form CuO.Rate this question:
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- 22.
Multiple Choice: What is the correct chemical formula of the compound barium acetate?
- A.
BaC2H3O2
- B.
Ba(C2H3O2)2
- C.
Ba2C2H3O2
- D.
Ba2(C2H3O2)2
Correct Answer
B. Ba(C2H3O2)2Explanation
Barium acetate is a compound made up of barium ions (Ba2+) and acetate ions (C2H3O2-). The correct chemical formula for barium acetate is Ba(C2H3O2)2, which indicates that there are two acetate ions bonded to one barium ion.Rate this question:
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- 23.
Multiple Choice: What is the correct chemical formula of the compound calcium sulfide?
- A.
CaS2
- B.
Ca2S
- C.
Ca2S2
- D.
CaS
Correct Answer
D. CaSExplanation
Calcium sulfide is composed of one calcium ion (Ca2+) and one sulfide ion (S2-). Therefore, the correct chemical formula for calcium sulfide is CaS.Rate this question:
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- 24.
Multiple Choice: What is the correct chemical formula of the compound potassium permanganate?
- A.
KMnO4
- B.
K2MnO4
- C.
KMnO3
- D.
K2MnO3
Correct Answer
A. KMnO4Explanation
Potassium permanganate is a compound composed of the elements potassium (K), manganese (Mn), and oxygen (O). The correct chemical formula for potassium permanganate is KMnO4, which indicates that there is one potassium atom, one manganese atom, and four oxygen atoms in the compound.Rate this question:
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- 25.
Multiple Choice: What is the correct chemical formula of the compound hydrogen peroxide?
- A.
HO2
- B.
H2O
- C.
H2O2
- D.
HO
Correct Answer
C. H2O2Explanation
Hydrogen peroxide is a compound made up of two hydrogen atoms and two oxygen atoms. Therefore, the correct chemical formula for hydrogen peroxide is H2O2.Rate this question:
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- 26.
Multiple Choice: What is the correct chemical formula of the compound sodium iodate?
- A.
NaIO
- B.
NaIO2
- C.
NaIO3
- D.
NaIO4
Correct Answer
C. NaIO3Explanation
The correct chemical formula for the compound sodium iodate is NaIO3. This is because sodium (Na) has a charge of +1 and iodate (IO3) has a charge of -1. To balance the charges, we need one sodium ion and one iodate ion, resulting in the formula NaIO3.Rate this question:
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- 27.
Multiple Choice: What is the correct chemical formula of the compound silicon tetrahydride?
- A.
Si4H4
- B.
Si4H
- C.
SiH4
- D.
SiH
Correct Answer
C. SiH4Explanation
The correct chemical formula of the compound silicon tetrahydride is SiH4. Silicon tetrahydride is a covalent compound consisting of one silicon atom bonded to four hydrogen atoms. The formula SiH4 indicates that there is one silicon atom and four hydrogen atoms in the compound.Rate this question:
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- 28.
Multiple Choice: What is the correct chemical formula of the compound plumbic cyanate?
- A.
Pb(CNO)4
- B.
PbCNO4
- C.
Pb4CNO
- D.
Pb4(CNO)4
Correct Answer
A. Pb(CNO)4Explanation
The correct chemical formula for the compound plumbic cyanate is Pb(CNO)4. This formula indicates that there is one lead (Pb) atom bonded to four cyanate (CNO) groups. The parentheses around CNO indicate that the cyanate group is treated as a single unit.Rate this question:
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- 29.
Multiple Choice: What is the correct chemical formula of the compound carbon dioxide?
- A.
C2O2
- B.
C2O
- C.
CO2
- D.
CO
Correct Answer
C. CO2Explanation
Carbon dioxide is a compound composed of one carbon atom and two oxygen atoms. The correct chemical formula for carbon dioxide is CO2.Rate this question:
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- 30.
Multiple Choice: What is the correct chemical formula of the compound periodic acid?
- A.
HIO3
- B.
HIO
- C.
HIO4
- D.
HIO2
Correct Answer
C. HIO4Explanation
Periodic acid is a compound that consists of one iodine atom, one hydrogen atom, and four oxygen atoms. The correct chemical formula for periodic acid is HIO4.Rate this question:
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- 31.
Identification: What is the correct chemical formula of the compound hydrochloric acid?
Correct Answer
HClExplanation
The correct chemical formula for hydrochloric acid is HCl. This is because hydrochloric acid consists of one hydrogen atom (H) and one chlorine atom (Cl), and the formula represents the combination of these two elements.Rate this question:
- 32.
Identification: What is the correct chemical formula of the compound aluminum hydroxide?
Correct Answer
Al(OH)3
Al (OH)3Explanation
The correct chemical formula for the compound aluminum hydroxide is Al(OH)3. The formula represents one atom of aluminum (Al) bonded to three hydroxide (OH) groups. The correct notation for the formula does not include any spaces between the elements or parentheses.Rate this question:
- 33.
Identification: What is the correct chemical formula of calcium chloride dihydrate?
Correct Answer
CaCl2.2H2O
CaCl2 . 2H2OExplanation
The correct chemical formula for calcium chloride dihydrate is CaCl2.2H2O. This formula indicates that there are two molecules of water (H2O) associated with each molecule of calcium chloride (CaCl2). The dot in between CaCl2 and 2H2O represents the presence of water molecules as a hydrate.Rate this question:
- 34.
Identification: What is the correct chemical formula of the compound ferrous oxide?
Correct Answer
FeOExplanation
The correct chemical formula for the compound ferrous oxide is FeO. This formula indicates that the compound consists of one iron (Fe) atom and one oxygen (O) atom. The term "ferrous" refers to the iron being in its +2 oxidation state, which is why the chemical symbol for iron is Fe and not Fe2+. The formula FeO is commonly used to represent this compound in chemical equations and formulas.Rate this question:
- 35.
Identification: What is the correct chemical formula of the compound pernitric acid?
Correct Answer
HNO4 - 36.
Identification: What is the correct chemical formula of the compound magnesium borate?
Correct Answer
Mg3(BO3)2
Mg3 (BO3)2Explanation
The correct chemical formula for the compound magnesium borate is Mg3(BO3)2.Rate this question:
- 37.
Identification: What is the correct chemical formula of the compound strontium dichromate?
Correct Answer
SrCr2O7Explanation
The correct chemical formula of the compound strontium dichromate is SrCr2O7. This formula indicates that the compound contains one strontium atom (Sr), two chromium atoms (Cr), and seven oxygen atoms (O). The subscript numbers indicate the number of atoms of each element present in the compound.Rate this question:
- 38.
Identification: What is the correct chemical formula of the compound hyposulfurous acid?
Correct Answer
H2SO2Explanation
Hyposulfurous acid is a compound that contains hydrogen (H) and sulfur (S). The chemical formula H2SO2 indicates that there are two hydrogen atoms and one sulfur atom present in the compound. The subscript 2 after the hydrogen (H) indicates that there are two hydrogen atoms bonded to the sulfur atom. Therefore, the correct chemical formula for hyposulfurous acid is H2SO2.Rate this question:
- 39.
Identification: What is the correct chemical formula of the compound sodium persilicate?
Correct Answer
Na4SiO5
Na4 SiO5Explanation
The correct chemical formula for the compound sodium persilicate is Na4SiO5. The formula consists of four sodium (Na) atoms, one silicon (Si) atom, and five oxygen (O) atoms. The presence of the subscript numbers indicates the number of atoms of each element in the compound.Rate this question:
- 40.
Identification: What is the correct chemical formula of the compound potassium iodide?
Correct Answer
KIExplanation
The correct chemical formula for potassium iodide is KI. This formula represents a compound made up of one potassium atom (K) and one iodine atom (I). Potassium iodide is commonly used as a source of iodine in various applications, including medicine and photography.Rate this question:
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