Chemical Formulas - 1st Attempt

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Quizzes Created: 5 | Total Attempts: 3,682
Questions: 20 | Attempts: 340

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Chemical Formulas - 1st Attempt - Quiz

This quiz tests students ability to name and/or write chemical formulas for covalent and ionic compounds, hydrates, and acids.


Questions and Answers
  • 1. 

    Write the formula for calcium hydroxide

    Explanation
    The correct answer is Ca(OH)2, which represents calcium hydroxide. In this formula, Ca represents the symbol for calcium, and (OH)2 represents two hydroxide ions. Calcium hydroxide is a compound that consists of one calcium ion (Ca2+) and two hydroxide ions (OH-). The formula accurately represents the composition and structure of calcium hydroxide.

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  • 2. 

    Write the formula for hydrosulfuric acid

    Explanation
    Hydrosulfuric acid is represented by the chemical formula H2S. The formula indicates that the compound consists of two hydrogen atoms (H2) bonded with one sulfur atom (S). This is a covalent compound, meaning that the hydrogen and sulfur atoms share electrons to form bonds. The formula accurately represents the composition of hydrosulfuric acid, with the ratio of two hydrogen atoms to one sulfur atom.

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  • 3. 

    Write the formula for Iron (II) oxide

    Explanation
    The formula for Iron (II) oxide is FeO. Iron (II) refers to the oxidation state of iron in the compound, which is +2. The oxide ion has a charge of -2. Therefore, to balance the charges, one iron ion with a +2 charge combines with one oxide ion with a -2 charge to form FeO.

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  • 4. 

    Write the formula for dinitrogen dioxide

    Explanation
    The formula for dinitrogen dioxide is N2O2 because the compound consists of two nitrogen atoms (N2) and two oxygen atoms (O2). The subscript 2 indicates that there are two atoms of each element in the molecule.

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  • 5. 

    Write the formula for scandium bromide

    Explanation
    The formula for scandium bromide is ScBr3. This means that the compound is made up of one scandium atom and three bromine atoms. The number 3 indicates that there are three bromine atoms present in the compound.

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  • 6. 

    Write the formula for sodium hypochlorite

    Explanation
    Sodium hypochlorite is represented by the chemical formula NaClO. This formula indicates that sodium (Na) is combined with chlorine (Cl) and oxygen (O) to form the compound. The subscript numbers indicate the ratio in which these elements are combined, with one sodium atom, one chlorine atom, and one oxygen atom present in each molecule of sodium hypochlorite. Therefore, NaClO accurately represents the formula for sodium hypochlorite.

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  • 7. 

    Write the formula for phosphoric acid

    Explanation
    Phosphoric acid is represented by the chemical formula H3PO4. The formula indicates that each molecule of phosphoric acid consists of three hydrogen atoms (H) bonded to one phosphorus atom (P), which is in turn bonded to four oxygen atoms (O). This formula accurately represents the composition and structure of phosphoric acid.

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  • 8. 

    Write the formula for sodium hydrogen carbonate

    Explanation
    The formula for sodium hydrogen carbonate is NaHCO3.

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  • 9. 

    Write the formula for acetic acid

    Explanation
    The correct answer is CH3COOH. This is the formula for acetic acid, which is a weak acid commonly found in vinegar. The formula indicates that it contains one carbon atom (C), two hydrogen atoms (H), and three oxygen atoms (O). The "CH3" group represents a methyl group, and the "COOH" group represents a carboxyl group, which is characteristic of organic acids.

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  • 10. 

    Write the formula for mercury (I) sulfate

    Explanation
    The formula for mercury (I) sulfate is Hg2SO4. This formula indicates that there are two atoms of mercury (Hg) and one molecule of sulfate (SO4) in the compound. The subscript 2 after Hg indicates that there are two atoms of mercury bonded together. The sulfate ion (SO4) consists of one sulfur atom and four oxygen atoms. Therefore, the correct formula for mercury (I) sulfate is Hg2SO4.

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  • 11. 

    Write the name for CsBr

    Explanation
    The correct name for CsBr is cesium bromide.

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  • 12. 

    Write the name for SO3

    Explanation
    The correct name for SO3 is sulfur trioxide because the compound consists of one sulfur atom and three oxygen atoms. The prefix "tri-" indicates the presence of three oxygen atoms, while "oxide" indicates the presence of oxygen. Therefore, the compound is named sulfur trioxide.

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  • 13. 

    Write the name for TiO2

    Explanation
    The correct answer is "titanium (IV) oxide" because it follows the naming convention for compounds containing a metal and a nonmetal. In this case, "titanium" represents the metal element, while "oxide" indicates the nonmetal element oxygen. The Roman numeral "IV" is used to denote the oxidation state of the titanium atom, which is +4 in this compound.

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  • 14. 

    Write the name for Au3PO4

    Explanation
    The correct name for Au3PO4 is gold (I) phosphate. This is because Au3 represents the gold ion with a +1 charge, and PO4 represents the phosphate ion. The Roman numeral I indicates that gold has a +1 oxidation state in this compound. Therefore, the correct name for this compound is gold (I) phosphate.

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  • 15. 

    Write the name for K2O2

    Explanation
    The correct answer is potassium peroxide because K2O2 is a compound composed of potassium (K) and oxygen (O). The name "potassium peroxide" is derived from the fact that it contains two oxygen atoms (peroxide) bonded to each potassium atom.

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  • 16. 

    Write the name for H2SO3

    Explanation
    Sulfurous acid is the correct name for H2SO3. It is a weak acid that is formed when sulfur dioxide dissolves in water. The name "sulfurous" indicates the presence of sulfur in the compound, while "acid" indicates its acidic nature. The formula H2SO3 represents the two hydrogen atoms bonded to the sulfur atom, and the three oxygen atoms bonded to the sulfur atom. Therefore, sulfurous acid is the appropriate name for this compound.

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  • 17. 

    Write the name for OF2

    Explanation
    The correct answer for the name OF2 is oxygen difluoride. This compound consists of one oxygen atom bonded with two fluorine atoms. The prefix "di-" indicates that there are two fluorine atoms present in the molecule. Therefore, the name "oxygen difluoride" accurately represents the composition of this compound.

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  • 18. 

    Write the name for HI

    Explanation
    The correct answer is "hydroiodic acid" because it is the accepted name for the compound HI. HI is a binary acid composed of hydrogen and iodine. The naming convention for binary acids involves using the prefix "hydro-" followed by the name of the nonmetal with the suffix "-ic" and the word "acid" at the end. In this case, the nonmetal is iodine, so the name becomes "hydroiodic acid."

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  • 19. 

    Write the name for Br4O9

    Explanation
    The correct name for the compound Br4O9 is tetrabromine nonoxide. This name indicates that the compound contains four bromine atoms (tetra-) and one oxygen atom (-nonoxide). The prefix "tetra-" is used to denote four, while "non-" is used to indicate the presence of one oxygen atom. Therefore, tetrabromine nonoxide accurately describes the composition of the compound.

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  • 20. 

    Write the name for PH3

    Explanation
    The correct name for PH3 is phosphorous trihydride. This is because the compound consists of one phosphorus atom bonded to three hydrogen atoms. The prefix "tri-" indicates the presence of three hydrogen atoms, while "phosphorous" refers to the phosphorus atom. Therefore, the name "phosphorous trihydride" accurately describes the composition of the compound.

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  • Mar 20, 2023
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  • Aug 31, 2010
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