Chemical Naming & Formulas

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Chemical Naming & Formulas - Quiz

This is a review quiz on Chemical Naming & Chemical Formulas. This covers naming and formulas of ionic and molecular compounds, acids and hydrates.


Questions and Answers
  • 1. 

    What is the chemical formula of silver nitrate.

    Explanation
    This compound is composed of a metal and nonmetals. Therefore, it is an ionic compound. You must get the symbol and charge of each ion (there's only one positive ion and one negative ion) and crisscross the charges.

    The first ion is silver. Silver's symbol and charge is Ag+1. We know silver is +1 because silver is always +1.

    The rest of the formula is therefore the 2nd ion--nitrate. Since it ends in -ate it is a polyatomic ion--look it up on your polyatomic ion chart. You'll find that nitrate is NO3 -1

    Write both ions next to each other and then crisscross the charges down to subscripts to get AgNO3.

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  • 2. 

    What is the chemical formula of carbon tetrachloride?

    Explanation
    Since this name has a prefix in it, you should recognize that it is a molecular compound. Use the prefixes to determine the chemical formula. Since carbon has no prefix there is only 1 carbon. Since chloride has the prefix tetra on it, we know there are 4 chlorine (chlorine with its ending changed to -ide).

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  • 3. 

    What is the chemical formula of hydrofluoric acid?

    Explanation
    Since the name states "acid" we know the compound starts with H. Acids are ionic compounds, so we need to get the symbol and charge of each ion. H+ is the first since it is an acid. Fluoric represents fluorine, F-. Crisscross the charges to get HF.

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  • 4. 

    What is the chemical formula of silicon dioxide octahydrate?

    Explanation
    You should recognize that hydrate means that water is attached to the compound. Octa- means 8. Therefore, 8 H2O are attached to the compound. The name of the compound is silicon dioxide. Since silicon dioxide has prefixes, use the prefixes to determine the chemical formula. Silicon with no prefix means 1 Silicon. Di on oxide means 2 oxygen--SiO2.

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  • 5. 

    What is the chemical formula of sodium oxide?

    Explanation
    This compound contains a metal & a nonmetal and therefore is an ionic compound. Get the symbol and charge of each ion and crisscross. Sodium is Na+ and oxide is just oxygen with a negative charge or O-2.

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  • 6. 

    What is the correct chemical formula for lead(II) acetate?

    • A.

      PbAc

    • B.

      Pb(C2H3O2)2

    • C.

      Pb(C2H3O2)4

    • D.

      PbC4H6O4

    Correct Answer
    B. Pb(C2H3O2)2
    Explanation
    This compound contains no prefixes so you know its an ionic compound. Determine the symbol and charge of each ion and crisscross. The Roman Numeral after lead indicates the charge of the lead--Pb+2. Acetate ends in -ate and is therefore a polyatomic ion. Look it up on your polyatomic ion chart and you'll find C2H3O2 -1.

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  • 7. 

    What is the common name for dihydrogen monoxide?

    • A.

      Ammonia

    • B.

      Water

    • C.

      Carbon dioxide

    • D.

      Methane

    Correct Answer
    B. Water
    Explanation
    Dihydrogen monoxide is H2O--water.

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  • 8. 

    What is the chemical formula for tin?

    • A.

      Sn

    • B.

      Ti

    • C.

      Sn2

    • D.

      Ti2

    Correct Answer
    A. Sn
    Explanation
    Tin is just an element and it is not one of the seven diatomic elements. Just write the symbol of the element.

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  • 9. 

    Ionic compounds that absorb water into their solid structure form

    • A.

      Nonpolar bonds

    • B.

      Molecules

    • C.

      Anhydrous substances

    • D.

      Hydrates

    Correct Answer
    D. Hydrates
    Explanation
    Hydrates absorb water.

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  • 10. 

    What is the ionic charge of the vanadium ion in the compound V2O5?

    • A.

      +2

    • B.

      -2

    • C.

      -5

    • D.

      +5

    Correct Answer
    D. +5
    Explanation
    The easiest way to determine the charge of an ion in an ionic compound is to crisscross the subscripts back up to charges.

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  • 11. 

    Which of these elements does not exist as a diatomic molecule?

    • A.

      Ne

    • B.

      F

    • C.

      H

    • D.

      I

    Correct Answer
    A. Ne
    Explanation
    There are 7 diatomic elements: H2,O2,N2,Cl2,Br2,I2,F2.

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  • 12. 

    Which of the following compounds is an acid?

    • A.

      BCl3

    • B.

      HNO3

    • C.

      H2O

    • D.

      C2H2

    Correct Answer
    B. HNO3
    Explanation
    Acids are compounds that typically start with a H+ ion. Only two of these compounds start with H and one of them is water (which is neutral--not an acid).

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  • 13. 

    What is the name of the compound whose formula is NaC2H3O2-9H2O?

    • A.

      Sodium carbonate hydrate

    • B.

      Sodium acetate hydrate

    • C.

      Sodium dicarbon trihydride dioxide water

    • D.

      Sodium acetate nonahydrate

    • E.

      Sodium acetate nonawater

    Correct Answer
    D. Sodium acetate nonahydrate
    Explanation
    A compound with -H2O at the end is a hydrate and it's name ends in hydrate. Name the rest of the compound the same as usual--since Na is a metal, it's an ionic compound and there should be no prefixes.

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  • 14. 

    What is the name for the compound FeS?

    Correct Answer
    iron(II) sulfide
    Iron (II) sulfide
    Iron(II) sulfide
    iron (II) sulfide
    Explanation
    FeS is a metal and a nonmetal--it's ionic--NO PREFIXES. Name the metal (iron). Iron is a transition metal so we need to add a Roman numeral to indicate it's charge. Sulfur's charge is -2 so Iron must be +2 to cancel it out. Then name the nonmetal changing its ending to -ide (sulfide).

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  • 15. 

    Name Cl2.

    Correct Answer
    Chlorine
    chlorine
    Explanation
    This is not a compound--there is only one element--So....just name the element.

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  • 16. 

    Name the compound N2O4.

    Correct Answer
    dinitrogen tetroxide
    Explanation
    The compound N2O4 is called dinitrogen tetroxide. It is an inorganic compound consisting of two nitrogen atoms (N2) and four oxygen atoms (O4). Dinitrogen tetroxide is a powerful oxidizer and is often used as a rocket propellant. It is a colorless liquid with a pungent odor and is highly reactive, especially with organic compounds.

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  • 17. 

    What is the name of Ca(NO3)2?

    Correct Answer
    calcium nitrate
    Calcium Nitrate
    Calcium nitrate
    Explanation
    If you see parentheses you know there is a polyatomic ion in the parentheses. Look up the name of that polyatomic ion (NO3 = nitrate). Then name the rest of the compound (Ca=calcium).

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  • 18. 

    Name HBr.

    Correct Answer
    hydrobromic acid
    Hydrobromic acid
    Hydrobromic Acid
    Explanation
    Since this starts with H, assume it's an acid. It is a binary acid (it has 2 elements) so the name is hydro-root-ic acid. Since the element other than hydrogen is bromine the name is hydrobromic acid.

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  • Current Version
  • Mar 13, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 29, 2009
    Quiz Created by
    Wack213

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