Multiple Choice
Which of the following formulas represents chromium(III) oxide?
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3. Chemical Reactions
Naming Ionic Compounds
Multiple Choice
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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