Multiple Choice
Which of the following is the correct chemical formula for ammonium sulfide?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for calcium permanganate?
A
Ca2MnO4
B
Ca(MnO4)2
C
Ca2(MnO4)3
D
CaMnO4
Verified step by step guidance1
Identify the ions involved: calcium ion (Ca) and permanganate ion (MnO4). Calcium typically forms a Ca^{2+} ion, and permanganate is a polyatomic ion with a charge of MnO4^{-}.
Determine the charges of each ion: Ca^{2+} has a charge of +2, and MnO4^{-} has a charge of -1.
Balance the total positive and negative charges to form a neutral compound. Since Ca^{2+} has a +2 charge and MnO4^{-} has a -1 charge, two permanganate ions are needed to balance one calcium ion.
Write the chemical formula by placing the calcium ion first, followed by the permanganate ion with a subscript of 2 to indicate two permanganate ions: Ca(MnO4)2.
Confirm that the formula is electrically neutral by checking that the total positive charge (+2 from Ca^{2+}) equals the total negative charge (2 × -1 from two MnO4^{-} ions).
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