10-item Test On Formula Writing

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This 10-item test will measure how well you understood the rules in writing down the correct chemical formulas of compounds. You have 5 minutes to complete the test. Identify the correct chemical formula of the given compound. Tick the letter that corresponds to your answer.

*Numbers in the chemical formulas are supposed to be treated as subscripts.


Questions and Answers
  • 1. 

    Carbon tetrachloride

    • A.

      CaCl4

    • B.

      CCl4

    • C.

      Ca4Cl

    • D.

      C4Cl

    Correct Answer
    B. CCl4
    Explanation
    Carbon tetrachloride is represented by the chemical formula CCl4. The prefix "tetra" indicates that there are four chlorine atoms bonded to a central carbon atom. Therefore, option CCl4 is the correct representation of carbon tetrachloride. The other options, CaCl4, Ca4Cl, and C4Cl, do not accurately represent the composition or structure of carbon tetrachloride.

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  • 2. 

    Copper (II) oxide 

    • A.

      CuO

    • B.

      Cu2O

    • C.

      CuO2

    • D.

      Cu2O2

    Correct Answer
    A. CuO
    Explanation
    Copper (II) oxide is represented by the chemical formula CuO. The Roman numeral II in the name indicates that copper has a +2 oxidation state in this compound. The formula Cu2O represents copper (I) oxide, where copper has a +1 oxidation state. CuO2 and Cu2O2 are incorrect formulas and do not represent any known compounds. Therefore, the correct answer is CuO.

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  • 3. 

    Sodium hypochlorite

    • A.

      NaClO4

    • B.

      NaClO3

    • C.

      NaClO2

    • D.

      NaClO

    Correct Answer
    D. NaClO
    Explanation
    Sodium hypochlorite is represented by the formula NaClO. The formula indicates that it is composed of one sodium atom (Na), one chlorine atom (Cl), and one oxygen atom (O). The subscript of 1 for each element indicates that there is only one atom of each element in the compound. Therefore, the correct answer is NaClO.

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  • 4. 

    Aluminum hydroxide

    • A.

      Al(OH)3

    • B.

      Al(OH)2

    • C.

      AlOH

    • D.

      AlO

    Correct Answer
    A. Al(OH)3
    Explanation
    The correct answer is Al(OH)3 because aluminum hydroxide is a compound that consists of one aluminum atom bonded with three hydroxide ions. The chemical formula Al(OH)3 accurately represents this composition, while the other options do not. Al(OH)2 represents a compound with only two hydroxide ions, AlOH represents a compound with only one hydroxide ion, and AlO represents a compound without any hydroxide ions. Therefore, Al(OH)3 is the correct formula for aluminum hydroxide.

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  • 5. 

    Copper (II) sulfate pentahydrate

    • A.

      Cu2SO4 . 5H2O

    • B.

      CuSO . 5H2O

    • C.

      CuSO4 . 5H2O

    • D.

      Cu2(SO4)2 .5H2O

    Correct Answer
    C. CuSO4 . 5H2O
    Explanation
    The correct answer is CuSO4 . 5H2O. This is because the compound is copper (II) sulfate pentahydrate, which is represented by the chemical formula CuSO4 . 5H2O. The formula Cu2(SO4)2 .5H2O is incorrect because it suggests that there are two copper atoms and two sulfate ions, which is not the case.

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  • 6. 

    Potassium permanganate

    • A.

      KMnO5

    • B.

      KMnO4

    • C.

      KMnO3

    • D.

      KMnO2

    Correct Answer
    B. KMnO4
    Explanation
    Potassium permanganate is represented by the chemical formula KMnO4. The correct answer, KMnO4, matches the given chemical formula. The other options, KMnO5, KMnO3, and KMnO2, do not match the correct chemical formula for potassium permanganate.

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  • 7. 

    Carbon dioxide

    • A.

      C2O

    • B.

      CO3

    • C.

      CO2

    • D.

      CO

    Correct Answer
    C. CO2
    Explanation
    The correct answer is CO2. Carbon dioxide is a chemical compound composed of one carbon atom bonded to two oxygen atoms. The formula CO2 represents this composition accurately. The other options provided in the question, C2O, CO3, and CO, do not correctly represent the composition of carbon dioxide.

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  • 8. 

    Hydrochloric acid

    • A.

      HClO4

    • B.

      HClO

    • C.

      HClO3

    • D.

      HCl

    Correct Answer
    D. HCl
    Explanation
    Hydrochloric acid is represented by the chemical formula HCl, which matches the given answer. HClO4, HClO, and HClO3 are not hydrochloric acid, but rather perchloric acid, hypochlorous acid, and chloric acid respectively. Therefore, the correct answer is HCl.

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  • 9. 

    Hyposulfurous acid

    • A.

      H2SO4

    • B.

      H2SO5

    • C.

      H2SO3

    • D.

      H2SO2

    Correct Answer
    D. H2SO2
    Explanation
    H2SO2 is the correct answer because it corresponds to the compound hyposulfurous acid. The formula H2SO2 indicates that the acid contains two hydrogen atoms and one sulfur atom. The prefix "hypo-" suggests that the acid has one less oxygen atom than the related sulfuric acid (H2SO4). Therefore, H2SO2 is the appropriate formula for hyposulfurous acid.

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  • 10. 

    Ammonium acetate

    • A.

      NH4C2H3O2

    • B.

      NH4(C2H3O2)2

    • C.

      (NH4)2C2H3O2

    • D.

      (NH4)2(C2H3O2)2

    Correct Answer
    A. NH4C2H3O2
    Explanation
    Ammonium acetate is a compound that consists of the ammonium ion (NH4+) and the acetate ion (C2H3O2-). The formula NH4C2H3O2 represents one ammonium ion and one acetate ion, which is the correct formula for ammonium acetate. The other options either have incorrect subscripts or include multiple ammonium or acetate ions, which would result in a different compound.

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Sep 28, 2009
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    Mcabana
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