Multiple Choice
Which of the following is the correct chemical formula for calcium hydroxide?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for sodium oxide?
A
Na2O
B
NaO
C
Na2O2
D
NaO2
Verified step by step guidance1
Identify the ions involved: Sodium (Na) typically forms a +1 cation (Na\^+), and oxygen (O) typically forms a -2 anion (O\^{2-}).
Determine the ratio of sodium ions to oxide ions needed to balance the charges so the compound is electrically neutral.
Since each sodium ion has a +1 charge and each oxide ion has a -2 charge, you need two sodium ions to balance one oxide ion.
Write the chemical formula by placing the number of each ion as subscripts: two sodium ions and one oxide ion gives Na\_2O.
Verify that the total positive charge (+2 from 2 Na\^+) balances the total negative charge (-2 from 1 O\^{2-}), confirming the formula Na\_2O is correct.
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