Multiple Choice
How many bromide ions are needed to combine with one aluminum ion to form a neutral ionic compound?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following pairs of formulas represents one ionic compound and one molecular compound?
A
CH4 and NH3
B
KBr and MgO
C
H2O and O2
D
NaCl and CO2
Verified step by step guidance1
Step 1: Understand the difference between ionic and molecular compounds. Ionic compounds are formed from metals and nonmetals where electrons are transferred, resulting in positive and negative ions. Molecular compounds are formed from nonmetals sharing electrons covalently.
Step 2: Identify the nature of each compound in the given pairs by looking at the elements involved. For example, NaCl consists of sodium (a metal) and chlorine (a nonmetal), which typically forms an ionic compound.
Step 3: Recognize that CO2 consists of carbon and oxygen, both nonmetals, which form covalent bonds, making CO2 a molecular compound.
Step 4: Compare the other pairs: CH4 and NH3 are both molecular compounds (nonmetals only), KBr and MgO are both ionic compounds (metal + nonmetal), and H2O and O2 are both molecular compounds (nonmetals only).
Step 5: Conclude that the pair NaCl (ionic) and CO2 (molecular) correctly represents one ionic and one molecular compound.
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