Ionic Compounds Chemistry: Polyatomic Ions Quiz

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Zohra Sattar, PhD, Chemistry |
Chemistry Expert
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Dr. Zohra Sattar Waxali earned her doctorate in chemistry and biochemistry from Northwestern University, specializing in the metallomes of cardiac cells and stem cells, and their impact on biological function. Her research encompasses the development of arsenoplatin chemotherapeutics, stapled peptide estrogen receptor inhibitors, and antimicrobial natural products. With her expertise, Dr. Waxali ensures the accuracy and relevance of our chemistry quizzes, contributing to a comprehensive understanding of chemical principles and advancements in the field.
, PhD, Chemistry
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Ionic Compounds Chemistry: Polyatomic Ions Quiz - Quiz

Welcome to the Polyatomic Ions Quiz! This quiz is designed to test your knowledge of polyatomic ions, essential components in chemistry. Polyatomic ions are groups of atoms with an overall electrical charge, forming an integral part of numerous chemical compounds.

A polyatomic ion is seen as a molecule that has been ionized by gaining or losing electrons. In a polyatomic ion, the group of covalently bonded atoms carries a net charge because the total number of electrons in the molecule is not equal to the total number of protons in the molecule.

This quiz offers an opportunity to enhance your Read moreknowledge and proficiency in handling polyatomic ions. Get ready to explore the world of chemical compounds and molecular formulas in this engaging and educational quiz on polyatomic ions!


Polyatomic Ions Questions and Answers

  • 1. 

    What is the name of this chemical? NH4+

    • A.

      Ammonium

    • B.

      Nitrite

    • C.

      Nitrate

    • D.

      Hydroxide

    • E.

      Acetate

    Correct Answer
    A. Ammonium
    Explanation
    NH4+ is known as the ammonium ion. In chemistry, it's a positively charged polyatomic ion (ion with more than one atom). It's formed by the protonation of ammonia (NH3). The other options in the list - Nitrite (NO2-), Nitrate (NO3-), Hydroxide (OH-), and Acetate (CH3COO-) are names of different ions and don't correspond to the given chemical formula, NH4+.

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  • 2. 

    What is the name of this chemical? CrO42-

    • A.

      Phosphate

    • B.

      Carbonate

    • C.

      Chromate

    • D.

      Sulfite

    • E.

      Sulfate

    Correct Answer
    C. Chromate
    Explanation
    The chemical with the molecular formula CrO₄²⁻ is known as Chromate. This polyatomic ion consists of one chromium atom bonded to four oxygen atoms, and its negative charge indicates a net charge of -2. In chemical reactions, chromate ions play a role in various processes, contributing to the diversity of chemical compounds.

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  • 3. 

    What is NO2?

    Correct Answer
    nitrogen dioxide
    Explanation
    NO2 is the chemical formula for nitrogen dioxide. It is a reddish-brown gas with a strong odor. Nitrogen dioxide is a pollutant commonly found in urban areas and is a major component of smog. It is produced from the combustion of fossil fuels, such as in vehicle engines and power plants. Nitrogen dioxide can have harmful effects on human health, particularly on the respiratory system, and it also contributes to environmental problems such as acid rain and the formation of ground-level ozone.

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  • 4. 

    Acetate can be shown as C2H3O2- or CH3COO-.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Acetate can indeed be represented as C2H3O2- or CH3COO-. These are both valid chemical formulas for the acetate ion, which is a negatively charged ion. The formula C2H3O2- shows the molecular composition of acetate, with two carbon atoms, three hydrogen atoms, and two oxygen atoms. The formula CH3COO- represents the structural formula of acetate, showing the arrangement of atoms in the molecule. Both formulas are commonly used to represent acetate in chemical reactions and equations. Therefore, the statement is true.

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  • 5. 

    What is CO32- called?

    • A.

      Chromate

    • B.

      Phosphate

    • C.

      Nitrite

    • D.

      Carbonate

    • E.

      Sulfate

    Correct Answer
    D. Carbonate
    Explanation
    The chemical formula CO₃²⁻ corresponds to the carbonate ion. Carbonate is a polyatomic ion composed of one carbon atom bonded to three oxygen atoms, carrying a charge of -2. It is a versatile ion found in various compounds, including common substances like calcium carbonate, which is a key component of limestone and chalk.

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  • 6. 

    OH- can be described as which polyatomic ion?

    • A.

      Hydroxite

    • B.

      Phosphate

    • C.

      Hydroxide

    • D.

      Helium

    • E.

      Deoxyribose

    Correct Answer
    C. Hydroxide
    Explanation
    OH- is the chemical formula for the hydroxide ion. It consists of one oxygen atom bonded to one hydrogen atom and carries a negative charge. The hydroxide ion is commonly found in bases and plays a crucial role in many chemical reactions. Therefore, the correct description for OH- is hydroxide.

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  • 7. 

    Is NO3- nitrite or nitrate?

    Correct Answer
    nitrate, Nitrate
    Explanation
    NO3- is the chemical formula for nitrate. Nitrate is an ion that consists of one nitrogen atom bonded to three oxygen atoms. It has a -1 charge, which is indicated by the negative sign. Nitrite, on the other hand, has the chemical formula NO2- and consists of one nitrogen atom bonded to two oxygen atoms. Therefore, the correct answer is nitrate, not nitrite.

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  • 8. 

    What does the ion phosphate contain?

    • A.

      1 phosphorus, 4 oxygen, and a 3- charge 

    • B.

      1 phosphorus, 4 oxygen, and a 2- charge 

    • C.

      2 phosphorus, 4 oxygen, and a 3- charge

    • D.

      1 phosphorus, 5 oxygen, and a 2- charge 

    • E.

      2 phosphorus, 4 oxygen, and a 3- charge 

    Correct Answer
    A. 1 phosphorus, 4 oxygen, and a 3- charge 
    Explanation
    The ion phosphate (PO₄³⁻) contains 1 phosphorus atom and 4 oxygen atoms, each carrying a charge of 2⁻, resulting in a total charge of 3⁻ for the phosphate ion.
    So, the correct representation is: 1 phosphorus, 4 oxygen, to the third power negative.

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  • 9. 

    Does SO32- represent sulfate or sulfite?

    • A.

      Sulfite

    • B.

      Sulfate

    • C.

      Both

    • D.

      Neither

    Correct Answer
    A. Sulfite
    Explanation
    The correct answer is sulfite. SO32- represents sulfite because it has a 2- charge, indicating that it has gained two electrons. Sulfite is a polyatomic ion composed of one sulfur atom and three oxygen atoms. It is commonly used as a preservative in food and beverages. Sulfate, on the other hand, is represented by SO42- and has a 2- charge. It is also a polyatomic ion but consists of four oxygen atoms bonded to a sulfur atom.

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  • 10. 

    What is the difference between sulfate and sulfite?

    • A.

      There is no difference, they are the same thing.

    • B.

      Sulfate has one more oxygen than sulfite.

    • C.

      Sulfate has a positive charge while sulfite has a negative charge.

    • D.

      Sulfite has one less sulfur than sulfate.

    • E.

      Sulfate goes to the third power, while sulfite goes to the second.

    Correct Answer
    B. Sulfate has one more oxygen than sulfite.
    Explanation
    Sulfate and sulfite are both chemical compounds that contain sulfur and oxygen. The main difference between them is the number of oxygen atoms present. Sulfate has one more oxygen atom than sulfite. This difference in oxygen atoms affects their chemical properties and reactivity. Sulfate ions have a negative charge, while sulfite ions have a charge of -2. Therefore, the correct answer is that sulfate has one more oxygen than sulfite.

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Zohra Sattar |PhD, Chemistry |
Chemistry Expert
Dr. Zohra Sattar Waxali earned her doctorate in chemistry and biochemistry from Northwestern University, specializing in the metallomes of cardiac cells and stem cells, and their impact on biological function. Her research encompasses the development of arsenoplatin chemotherapeutics, stapled peptide estrogen receptor inhibitors, and antimicrobial natural products. With her expertise, Dr. Waxali ensures the accuracy and relevance of our chemistry quizzes, contributing to a comprehensive understanding of chemical principles and advancements in the field.

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