Binary Compound Quiz
Questions: 16 · 10 minutes
1. In Cu2O, oxygen contributes a total charge of -2. What is the Stock-system name of the compound?
Copper(I) oxide, because each copper ion has a +1 charge
Copper(II) oxide, because each copper ion has a +2 charge
Dicopper oxide, using molecular prefixes for an ionic compound
Copper(I) dioxide, incorrectly indicating two oxygen atoms
2. Consider H2O, NaOH, CO, and CaCO3. Which are binary compounds?
H2O only, excluding carbon monoxide
NaOH and CaCO3, despite each containing three elements
All four compounds, regardless of the number of elements
H2O and CO, because each contains exactly two elements
3. Which definition best describes a binary compound?
A compound made from two identical ions
A mixture of two substances in any proportion
A molecule containing exactly two atoms
A pure substance containing exactly two different elements
4. Using molecular-compound prefixes, what is the name of N2O5?
Nitrogen oxide, with both prefixes omitted
Dinitrogen oxide, accounting only for the nitrogen subscript
Nitrogen pentoxide, omitting the prefix for two nitrogen atoms
Dinitrogen pentoxide, representing two nitrogen and five oxygen atoms
5. Sodium forms Na+ ions and sulfur forms S2- ions. Which formula balances their charges?
Na2S, with two sodium ions for each sulfide ion
NaS2, with one sodium ion for two sulfide ions
Na2SO4, which introduces oxygen and a sulfate ion
NaS, with the ions combined in a one-to-one ratio
6. Two containers are labeled KBr and KBrO3. Which statement correctly identifies the binary compound?
Both are binary because both substances are potassium salts
Only KBrO3 is binary because the presence of oxygen determines the category
Only KBr is binary because it contains exactly two different elements
Neither is binary because both formulas contain more than two total atoms
7. A sample is labeled FeCl3. Because each chloride ion has a -1 charge, what is the compound's Stock-system name?
Iron(I) chloride, assigning iron a +1 charge
Iron(II) chloride, assigning iron a +2 charge
Iron(III) chlorate, incorrectly treating the anion as chlorate
Iron(III) chloride, assigning iron a +3 charge
8. An unknown binary substance is a high-melting solid. It does not conduct electricity as a solid but does conduct when molten. Which classification best fits the evidence?
A nonpolar molecular compound with weak intermolecular forces
An ionic compound with mobile ions in the molten state
A polar molecular compound made only of neutral molecules
A metallic element with freely moving electrons in the solid state
9. A binary compound has the formula XCl2. If each chloride ion is Cl-, what charge must each X ion have?
Positive two, balancing two negative chloride charges
Positive one, balancing only one chloride charge
Negative one, giving all three ions negative charges
Negative two, matching rather than balancing the chloride total
10. Which formula correctly represents sulfur hexafluoride?
S6F, placing the six on sulfur rather than fluorine
S6F6, assigning six atoms to both elements
SF6, showing one sulfur atom and six fluorine atoms
SF5, showing only five fluorine atoms
11. Magnesium has an oxidation state of +2 in MgO. Because the compound is neutral, what is oxygen's oxidation state?
Positive two, which would make the total charge positive
Negative two, which balances magnesium's positive charge
Negative one, which would not fully balance magnesium
Positive one, which would add another positive charge
12. Aluminum forms Al3+ ions and oxygen forms O2- ions. Which neutral formula do they produce?
Al2O3, using two aluminum ions and three oxide ions
AlO, using one ion of each element
AlO2, using one aluminum ion and two oxide ions
Al3O2, using three aluminum ions and two oxide ions
13. What is the standard name for CO2?
Carbon monoxide, indicating one oxygen atom
Carbon dioxide, indicating two oxygen atoms
Carbon oxide, with no numerical prefix
Dicarbon monoxide, indicating two carbon atoms
14. A student is asked to write the formula for phosphorus trichloride. Which response is correct?
P3Cl, placing the subscript three on phosphorus
PCl3, showing one phosphorus atom and three chlorine atoms
PCl, omitting the quantity expressed by the prefix tri-
P3Cl3, assigning a subscript of three to both elements
15. Magnesium transfers electrons to oxygen when MgO forms. How should MgO be classified?
A metallic mixture because magnesium is a metal
A binary molecular compound with shared electrons
A binary ionic compound made of oppositely charged ions
A ternary ionic compound containing three elements
16. Which formula represents a binary compound?
NaOH, which contains sodium, oxygen, and hydrogen
CaCO3, which contains calcium, carbon, and oxygen
NaCl, which contains only sodium and chlorine
NH4NO3, which contains nitrogen, hydrogen, and oxygen