객관식
What is the correct name for the compound with the formula NH4CN?
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3. Chemical Reactions
Naming Ionic Compounds
객관식
Which of the following is the correct chemical formula for the ionic compound barium iodide?
A
BaI
B
Ba2I2
C
Ba2I
D
BaI2
검증된 단계별 안내1
Identify the ions involved: barium forms a cation with a charge of +2 (Ba^{2+}), and iodide forms an anion with a charge of -1 (I^{-}).
Determine the ratio of ions needed to balance the overall charge of the compound. Since barium has a +2 charge and iodide has a -1 charge, two iodide ions are needed to balance one barium ion.
Write the chemical formula by combining one barium ion with two iodide ions, ensuring the total positive and negative charges cancel out.
Express the formula with the cation first followed by the anion, using subscripts to indicate the number of each ion: BaI_{2}.
Verify that the formula is electrically neutral by confirming that the total positive charge (+2 from Ba^{2+}) equals the total negative charge (2 × -1 from 2 I^{-}).
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