Multiple Choice
What is the correct chemical formula for the compound lead(II) cyanide?
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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 Sc(ClO_4)_3?
A
Scandium trichloride
B
Scandium chloride
C
Scandium perchlorate
D
Scandium chlorate
Verified step by step guidance1
Identify the cation and anion in the compound formula Sc(ClO_4)_3. Here, Sc is the cation (Scandium) and ClO_4 is the anion (perchlorate).
Recognize that ClO_4 is the perchlorate ion, which is a polyatomic ion with a charge of -1.
Determine the charge on the scandium ion. Since there are three perchlorate ions each with a -1 charge, scandium must have a +3 charge to balance the compound electrically.
Use the name of the cation (Scandium) followed by the name of the anion (perchlorate) to name the compound. Since scandium has only one common oxidation state (+3), no Roman numeral is needed.
Combine the names to get the correct name: 'Scandium perchlorate'. This reflects the cation and the polyatomic anion present in the compound.
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