Multiple Choice
What is the correct chemical formula for iron(III) phosphide?
1
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3. Chemical Reactions
Naming Ionic Compounds
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What is the correct name for the ionic compound formed from Sr and P?
A
Strontium diphosphide
B
Strontium phosphate
C
Strontium phosphorus
D
Strontium phosphide
Verified step by step guidance1
Identify the elements involved: Sr (Strontium) is a metal and P (Phosphorus) is a nonmetal, so they form an ionic compound.
Determine the charges of the ions: Strontium typically forms a +2 ion (Sr^{2+}), and phosphorus forms a -3 ion (P^{3-}) as the phosphide ion.
Balance the charges to find the correct formula: To balance +2 and -3 charges, find the least common multiple, which is 6. This means 3 Sr^{2+} ions and 2 P^{3-} ions combine to form Sr_3P_2.
Name the compound using the cation name followed by the anion name: The cation is 'Strontium' and the anion is 'phosphide' (the name for P^{3-} ion).
Combine the names without prefixes for ionic compounds: The correct name is 'Strontium phosphide' because ionic compounds do not use prefixes like 'di-' or 'tri-' in their names.
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