Scelta multipla
Which of the following is the correct chemical formula for sodium oxalate?
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3. Chemical Reactions
Naming Ionic Compounds
Scelta multipla
Which of the following is the correct chemical formula for aluminum oxide?
A
Al3O2
B
AlO2
C
Al2O3
D
AlO
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Identify the charges of the ions involved: aluminum typically forms a +3 charge (Al^{3+}), and oxygen typically forms a -2 charge (O^{2-}).
To write the correct formula for aluminum oxide, balance the total positive and negative charges so that the compound is electrically neutral.
Determine the smallest whole number ratio of aluminum ions to oxide ions that balances the charges. This means finding the least common multiple (LCM) of the charges 3 and 2.
Use the LCM to find the number of each ion: since the LCM of 3 and 2 is 6, you need 2 aluminum ions (2 × +3 = +6) and 3 oxide ions (3 × -2 = -6) to balance the charges.
Write the chemical formula by placing the number of each ion as subscripts: Al_{2}O_{3}.
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