Writing Formulas For Polyatomic & Monatomic Ions

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Writing Formulas For Polyatomic & Monatomic Ions - Quiz

This is a practice quiz for writing formulas for polyatomic and monatomic ions, include correct charges. Don't worry about using subscript or superscript. Instead use ^ for superscript. For example, for CO32-, just type CO3^2-.


Questions and Answers
  • 1. 

    Nitrate

  • 2. 

    Sulfite

    Explanation
    Sulfite (SO3^2-) is a negatively charged polyatomic ion that consists of one sulfur atom bonded to three oxygen atoms. The "2-" superscript indicates that the ion has a charge of -2. Sulfite ions are commonly found in compounds such as sodium sulfite (Na2SO3) and potassium sulfite (K2SO3). The correct answer simply identifies the formula and charge of the sulfite ion without providing any further explanation.

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  • 3. 

    Azide

  • 4. 

    Cyanide

    Explanation
    Cyanide is represented by the chemical formula CN^1-, where CN is the cyanide ion and the superscript - indicates its charge of -1. The cyanide ion consists of a carbon atom bonded to a nitrogen atom, with a triple bond between them. The negative charge indicates that the ion has gained one electron, resulting in a total of 10 electrons. Cyanide is a highly toxic compound that can inhibit cellular respiration by binding to cytochrome c oxidase, preventing the cells from using oxygen.

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  • 5. 

    Oxalate

    Explanation
    Oxalate is represented by the chemical formula C2O4^2-. The superscript 2- indicates that the oxalate ion has a charge of -2. The formula C2O4 represents the combination of two carbon atoms and four oxygen atoms. The -2 charge means that the ion has gained two extra electrons, resulting in a negative charge.

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  • 6. 

    Phosphate

    Explanation
    Phosphate (PO4^3-) is a polyatomic ion consisting of one phosphorus atom bonded to four oxygen atoms. The superscript 3- indicates that the ion has a charge of -3, meaning it has gained three electrons. Phosphate is commonly found in biological systems and is an essential component of DNA, RNA, and ATP. It plays a crucial role in energy transfer and storage, as well as in the formation of bones and teeth.

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  • 7. 

    Thiocyanate

    Explanation
    Thiocyanate (SCN^1-) is an anion that consists of a sulfur atom bonded to a carbon atom through a triple bond, and the carbon atom is further bonded to a nitrogen atom. The negative charge on the thiocyanate ion is due to an extra electron, resulting in a total charge of -1. Thiocyanate is commonly found in various chemical compounds and is known for its ability to form complex compounds with metal ions.

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  • 8. 

    Hydroxide

    Explanation
    The correct answer is OH^1-. Hydroxide (OH^1-) is a negatively charged polyatomic ion consisting of one oxygen atom and one hydrogen atom. It is commonly found in many chemical compounds and is known for its basic properties. The negative charge of the hydroxide ion is due to the extra electron it possesses.

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  • 9. 

    Sulfate

    Explanation
    Sulfate is a polyatomic ion with a charge of 2-. The chemical formula for sulfate is SO4^2-. The superscript 2- indicates that the ion has a charge of 2-, meaning it has gained two extra electrons. The sulfate ion is formed when sulfuric acid (H2SO4) loses two hydrogen ions (H+) and forms a compound with the remaining sulfate group (SO4). The sulfate ion is commonly found in various compounds and minerals and is important in many chemical reactions and industrial processes.

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  • 10. 

    Nitrite

    Explanation
    Nitrite (NO2^1-) is an anion that consists of one nitrogen atom and two oxygen atoms. The superscript -1 indicates that the ion carries a single negative charge. Nitrite is commonly found in various chemical compounds and is used in industrial processes, as well as in food preservation. It is also a byproduct of the nitrogen cycle in the environment.

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  • 11. 

    Thiosulfate

    Explanation
    Thiosulfate is a polyatomic ion with the chemical formula S2O3^2-. It consists of two sulfur atoms bonded to three oxygen atoms. The negative charge on the ion indicates that it has gained two electrons. Thiosulfate is commonly used in various chemical reactions and industrial processes. It is also used in photography as a fixing agent to remove unexposed silver halide from photographic film or paper.

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  • 12. 

    Borate

    Explanation
    The correct answer is BO3^3-. The chemical formula BO3^3- represents a borate ion, which is a negatively charged polyatomic ion consisting of one boron atom and three oxygen atoms. Borate ions are commonly found in borate minerals and are also used in various industrial applications, such as in the production of glass and ceramics.

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  • 13. 

    Chlorate

    Explanation
    Chlorate (ClO3^1-) is an anion that consists of one chlorine atom bonded to three oxygen atoms. The negative charge on the ion indicates that it has gained one extra electron to achieve a stable electron configuration. Chlorate ions are commonly found in compounds such as sodium chlorate (NaClO3) and potassium chlorate (KClO3) and are used in various industrial applications, including as an oxidizing agent and in the production of explosives.

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  • 14. 

    Permanganate

    Explanation
    Permanganate is a polyatomic ion with a charge of 1-. Its chemical formula is MnO4^1-. The Mn represents the element manganese, and the O represents oxygen. The 4 subscript indicates that there are four oxygen atoms bonded to the manganese atom. The 1- superscript indicates that the ion has a charge of 1-, meaning it has gained one electron to achieve a stable configuration.

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  • 15. 

    Hydrogen carbonate or bicarbonate

    Explanation
    The correct answer is HCO3^1-. This is the chemical formula for hydrogen carbonate or bicarbonate ion. It consists of one hydrogen atom (H), one carbon atom (C), and three oxygen atoms (O). The superscript -1 indicates that the ion carries a single negative charge. Hydrogen carbonate ions are commonly found in many chemical reactions and biological processes, such as buffering systems in the blood and carbon dioxide transport in the body.

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  • 16. 

    Perchlorate

    Explanation
    Perchlorate is an anion with the chemical formula ClO4^1-. The superscript -1 indicates that the ion carries a single negative charge. The ClO4^1- ion consists of one chlorine atom bonded to four oxygen atoms, with each oxygen atom carrying a single negative charge. This arrangement gives the ion a tetrahedral shape. Perchlorate is a strong oxidizing agent and is commonly used in rocket propellants, explosives, and fireworks. It can also be found in certain medications and as a contaminant in water sources.

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  • 17. 

    Chromate

    Explanation
    Chromate is a polyatomic ion with a charge of 2-. The chemical formula for chromate is CrO4^2-. In this ion, there is one chromium atom bonded to four oxygen atoms. The oxidation state of chromium in chromate is +6, while the oxidation state of oxygen is -2. The 2- charge indicates that the chromate ion has gained two electrons to achieve a stable configuration.

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  • 18. 

    Peroxide

    Explanation
    The correct answer is O2^2-. This is because peroxide refers to a compound that contains the peroxide ion, which is O2^2-. The superscript 2- indicates that the ion has a charge of -2, meaning it has gained two electrons. The peroxide ion consists of two oxygen atoms bonded together, and it is commonly found in compounds such as hydrogen peroxide (H2O2).

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  • 19. 

    Hydrogen phosphate

    Explanation
    Hydrogen phosphate is represented by the chemical formula HPO4^2-. The superscript 2- indicates that the ion has a charge of -2, meaning it has gained two extra electrons. The presence of the hydrogen atom in the formula indicates that one of the oxygen atoms has been replaced by a hydrogen atom. Hydrogen phosphate is a polyatomic ion that is commonly found in various compounds and is important in many biological and chemical processes.

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  • 20. 

    Iodate

  • 21. 

    Hypochlorite

    Explanation
    The correct answer is ClO^1-. Hypochlorite is a chemical compound that contains the hypochlorite ion, which is represented as ClO^1-. The superscript 1- indicates that the ion has a charge of -1, meaning it has gained one electron. Hypochlorite is commonly found in bleach and is used as a disinfectant and oxidizing agent.

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  • 22. 

    Formate

    Explanation
    The correct answer is HCOO^1-. The notation "HCOO^1-" represents the formate ion, which is a polyatomic ion with a charge of -1. The ion consists of one carbon atom bonded to two oxygen atoms and one hydrogen atom. The carbon atom is in the +4 oxidation state, while the oxygen atoms are in the -2 oxidation state. The hydrogen atom has a +1 oxidation state. The formate ion is commonly found in salts and is used in various chemical reactions and industrial processes.

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  • 23. 

    Acetate (There are two possible answers)

    Explanation
    The correct answer is C2H3O2^1- and CH3COO^1-. These are two different representations for the same chemical formula, which is the acetate ion. The ion has a negative charge of 1- and is commonly found in compounds such as sodium acetate or potassium acetate. Both representations accurately describe the composition and charge of the acetate ion.

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  • 24. 

    Periodate

  • 25. 

    Chlorite

    Explanation
    Chlorite refers to the chemical compound ClO2^1-, where Cl represents the element chlorine and O represents oxygen. The superscript -1 indicates that the ion carries a negative charge, meaning it has gained one electron. This ion, known as chlorite, is commonly found in various industrial processes and is used as a disinfectant and bleaching agent.

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  • 26. 

    Dichromate

    Explanation
    Dichromate refers to the chemical compound Cr2O7^2-. This compound consists of two chromium atoms bonded to seven oxygen atoms. The charge of the dichromate ion is 2-, indicated by the superscript -2. The correct answer simply states the chemical formula of dichromate, which is Cr2O7^2-.

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  • 27. 

    Bromate

    Explanation
    Bromate is represented by the chemical formula BrO3^1-. The superscript -1 indicates that the ion carries a single negative charge. This ion is formed when bromine reacts with oxygen and gains three oxygen atoms, resulting in a negative charge to balance the positive charge of the bromine atom.

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  • 28. 

    Ammonium

    Explanation
    Ammonium (NH4^1+) is a positively charged polyatomic ion composed of one nitrogen atom and four hydrogen atoms. It is formed when ammonia (NH3) accepts a proton (H+) to become NH4^1+. The superscript "+1" indicates the charge of the ion, which means it has one more proton than electrons. Ammonium is commonly found in various compounds and is important in biological and chemical processes.

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  • 29. 

    Oxide

  • 30. 

    Hydride

    Explanation
    The correct answer is H^1- because the symbol "H" represents the element hydrogen, and the superscript "-1" indicates that it has gained one extra electron, resulting in a negative charge. This makes it a hydride ion, which is a negatively charged hydrogen atom.

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  • 31. 

    Magnesium Ion

    Explanation
    The correct answer is Mg^2+ because it represents a magnesium ion with a positive charge of 2. The superscript 2+ indicates that the ion has lost two electrons, resulting in a positive charge.

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  • 32. 

    Hydrogen Ion

    Explanation
    The given correct answer, H^1+, represents a hydrogen ion. This ion has a positive charge, indicated by the superscript "+". Hydrogen ions are formed when a hydrogen atom loses its electron, resulting in a single proton remaining. This ion is commonly found in acidic solutions and plays a crucial role in various chemical reactions and biological processes.

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  • 33. 

    Nitride

    Explanation
    Nitride is a negatively charged ion with a charge of -3, represented as N^3-. This means that it has gained three extra electrons to achieve a stable electron configuration. Nitride ions are formed when nitrogen atoms gain three electrons through the process of ionization. The negative charge on the nitride ion is indicated by the superscript -3.

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  • 34. 

    Iron (II) Ion

    Explanation
    The given correct answer is Fe^2+. This indicates that the ion being referred to is the Iron (II) ion. The notation Fe^2+ represents an iron atom that has lost two electrons, resulting in a positive charge of 2+.

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  • 35. 

    Chloride

    Explanation
    The correct answer is Cl^1-. This notation represents the chloride ion, which has a charge of -1. The superscript 1 indicates that there is only one chloride ion present. Chloride is a negatively charged ion that is commonly found in compounds such as sodium chloride (NaCl) and calcium chloride (CaCl2). It plays important roles in various biological and chemical processes.

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  • 36. 

    Fluoride

    Explanation
    Fluoride is represented by the symbol F and has a charge of -1, as indicated by the superscript 1-. The superscript represents the charge of the ion, and in this case, it indicates that fluoride has gained one electron, resulting in a negative charge. This charge allows fluoride to easily form compounds with other elements, such as sodium fluoride (NaF) or calcium fluoride (CaF2).

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  • 37. 

    Bromide

  • 38. 

    Iodide

    Explanation
    Iodide is represented by the symbol I^1-. The superscript 1- indicates that the iodide ion has a charge of -1, meaning it has gained one electron. This charge is due to the iodine atom gaining an electron to achieve a stable electron configuration. The iodide ion is commonly found in compounds such as potassium iodide (KI) and sodium iodide (NaI).

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  • 39. 

    Sulfide

    Explanation
    The correct answer is S^2- because sulfide is an anion that has a charge of -2. The superscript 2- indicates that the sulfide ion has gained two electrons, resulting in a negative charge.

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  • 40. 

    Aluminum Ion

    Explanation
    Al^3+ refers to the aluminum ion with a charge of +3. In chemical reactions, aluminum tends to lose three electrons to achieve a stable electron configuration, resulting in the formation of Al^3+. This ion is commonly found in various compounds and plays a significant role in many industrial applications. Its charge and properties make it useful in processes such as metal plating, water treatment, and the production of aluminum-based products.

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  • 41. 

    Iron (III) Ion

    Explanation
    The given answer, Fe^3+, represents the Iron (III) ion. The superscript 3+ indicates that the ion has a positive charge of 3. This means that the ion has lost three electrons, resulting in a positive charge. The symbol Fe represents the chemical element Iron. Therefore, Fe^3+ is the correct representation of the Iron (III) ion.

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  • 42. 

    Sodium Ion

    Explanation
    The correct answer is Na^1+ because it represents a sodium ion with a positive charge of +1. The superscript 1+ indicates that the sodium ion has lost one electron, resulting in a net positive charge. Sodium ions are commonly found in salts and are important for various biological processes in the body.

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  • 43. 

    Lithium Ion

    Explanation
    Lithium Ion refers to an atom of lithium that has lost one electron, resulting in a positive charge of +1. The symbol Li^1+ represents this lithium ion, with the superscript indicating the positive charge.

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  • 44. 

    Calcium Ion

    Explanation
    The correct answer is Ca^2+ because it represents a calcium ion with a charge of +2. The superscript 2+ indicates that the ion has lost two electrons, giving it a positive charge. Calcium ions are important in many biological processes, including muscle contraction, nerve signaling, and bone formation.

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  • 45. 

    Titanium (IV) Ion

    Explanation
    The correct answer is Ti^4+. This notation represents the titanium ion with a charge of +4. The superscript of 4 indicates that the ion has lost four electrons, resulting in a positive charge. Titanium is a transition metal and can form ions with different charges depending on its oxidation state. In this case, the Roman numeral IV indicates that the ion has an oxidation state of +4.

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  • Jan 23, 2023
    Quiz Edited by
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  • Jun 15, 2010
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    Hope4flower
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