Multiple Choice
Which of the following is the correct chemical formula for aluminum chromate?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for table salt?
A
CaCl2
B
Na2SO4
C
NaCl
D
KCl
Verified step by step guidance1
Understand that table salt is the common name for sodium chloride, a compound formed from sodium (Na) and chlorine (Cl).
Recall that sodium (Na) is a Group 1 element with a +1 charge when it forms ions, and chlorine (Cl) is a Group 17 element with a -1 charge when it forms ions.
Since the charges of Na+ and Cl- are equal and opposite, they combine in a 1:1 ratio to form a neutral compound.
Write the chemical formula by placing the symbols of sodium and chlorine together without any subscripts, as the ratio is 1:1, resulting in NaCl.
Verify that the other options (CaCl2, Na2SO4, KCl) represent different compounds: CaCl2 is calcium chloride, Na2SO4 is sodium sulfate, and KCl is potassium chloride, none of which are table salt.
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