Multiple Choice
In the chemical formula for table salt, NaCl, how many atoms of sodium (Na) are present in one formula unit?
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3. Chemical Reactions
Naming Ionic Compounds
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What is the correct name for the compound with the formula Ba(OH)_2?
A
Barium hydroxide
B
Barium hydrogen oxide
C
Barium dihydroxide
D
Barium oxide
Verified step by step guidance1
Identify the cation and anion in the compound. In Ba(OH)\_2, Ba is the cation (barium ion) and OH is the anion (hydroxide ion).
Recognize that OH is the hydroxide ion, which is a common polyatomic ion with a charge of -1.
Since there are two hydroxide ions, the formula shows Ba(OH)\_2, indicating one barium ion balances two hydroxide ions.
Name the compound by stating the cation name first (Barium) followed by the name of the anion (hydroxide).
Combine the names without adding prefixes for the number of hydroxide ions because the charge balance is implied, resulting in the name 'Barium hydroxide'.
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