Multiple Choice
Which of the following formulas represents chromium(III) oxide?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for the ionic compound sodium chromate?
A
Na2Cr2O7
B
NaCr2O7
C
Na2CrO4
D
NaCrO4
Verified step by step guidance1
Identify the ions involved in the compound sodium chromate. Sodium forms the ion Na\textsuperscript{+}, and the chromate ion is CrO\textsubscript{4}\textsuperscript{2-}.
Determine the charges of each ion: Na\textsuperscript{+} has a +1 charge, and CrO\textsubscript{4}\textsuperscript{2-} has a -2 charge.
Balance the total positive and negative charges to make the compound electrically neutral. Since each chromate ion has a -2 charge, you need two sodium ions (each +1) to balance one chromate ion.
Write the formula by combining the ions in the ratio that balances the charges: two Na\textsuperscript{+} ions for every one CrO\textsubscript{4}\textsuperscript{2-} ion, resulting in Na\textsubscript{2}CrO\textsubscript{4}.
Verify that the formula Na\textsubscript{2}CrO\textsubscript{4} corresponds to sodium chromate, distinguishing it from other related compounds like sodium dichromate (Na\textsubscript{2}Cr\textsubscript{2}O\textsubscript{7}).
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