Chemical Naming & Formulas
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.Rate this question:
- 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).Rate this question:
- 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.Rate this question:
- 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.Rate this question:
- 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.Rate this question:
- 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)2Explanation
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.Rate this question:
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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. WaterExplanation
Dihydrogen monoxide is H2O--water.Rate this question:
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- 8.
What is the chemical formula for tin?
- A.
Sn
- B.
Ti
- C.
Sn2
- D.
Ti2
Correct Answer
A. SnExplanation
Tin is just an element and it is not one of the seven diatomic elements. Just write the symbol of the element.Rate this question:
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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. HydratesExplanation
Hydrates absorb water.Rate this question:
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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. +5Explanation
The easiest way to determine the charge of an ion in an ionic compound is to crisscross the subscripts back up to charges.Rate this question:
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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. NeExplanation
There are 7 diatomic elements: H2,O2,N2,Cl2,Br2,I2,F2.Rate this question:
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- 12.
Which of the following compounds is an acid?
- A.
BCl3
- B.
HNO3
- C.
H2O
- D.
C2H2
Correct Answer
B. HNO3Explanation
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).Rate this question:
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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 nonahydrateExplanation
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.Rate this question:
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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) sulfideExplanation
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).Rate this question:
- 15.
Name Cl2.
Correct Answer
Chlorine
chlorineExplanation
This is not a compound--there is only one element--So....just name the element.Rate this question:
- 16.
Name the compound N2O4.
Correct Answer
dinitrogen tetroxideExplanation
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.Rate this question:
- 17.
What is the name of Ca(NO3)2?
Correct Answer
calcium nitrate
Calcium Nitrate
Calcium nitrateExplanation
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).Rate this question:
- 18.
Name HBr.
Correct Answer
hydrobromic acid
Hydrobromic acid
Hydrobromic AcidExplanation
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.Rate this question:
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Mar 13, 2024Quiz Edited by
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Apr 29, 2009Quiz Created by
Wack213
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