Multiple Choice
Which of the following chemical formulas represents ammonium nitrate?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for barium chloride?
A
BaCl
B
Ba2Cl2
C
BaCl2
D
Ba2Cl
Verified step by step guidance1
Identify the charges of the ions involved: barium (Ba) is a group 2 metal and forms a cation with a charge of +2, written as $\mathrm{Ba^{2+}}$.
Chloride (Cl) is a halide ion with a charge of -1, written as $\mathrm{Cl^-}$.
To form a neutral compound, the total positive charge must balance the total negative charge. Since barium has a +2 charge, two chloride ions, each with a -1 charge, are needed to balance it.
Write the chemical formula by combining one barium ion with two chloride ions, resulting in $\mathrm{BaCl_2}$.
Verify that the formula is electrically neutral: $+2$ from barium and $2 \times (-1) = -2$ from chloride sum to zero.
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