객관식
Which of the following is the correct chemical formula for potassium oxide?
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3. Chemical Reactions
Writing Ionic Compounds
객관식
Which of the following is the correct chemical formula for aluminum carbonate?
A
Al(CO3)3
B
AlCO3
C
Al3(CO3)2
D
Al2(CO3)3
검증된 단계별 안내1
Identify the charges of the ions involved: aluminum typically forms a +3 charge (Al^{3+}), and the carbonate ion (CO_3) has a -2 charge (CO_3^{2-}).
To write the correct formula for aluminum carbonate, balance the total positive and negative charges so that the compound is electrically neutral.
Set up the charge balance equation: let the number of aluminum ions be x and the number of carbonate ions be y. Then, 3x (positive charges) must equal 2y (negative charges), or 3x = 2y.
Find the smallest whole number ratio that satisfies 3x = 2y. This ratio is x = 2 and y = 3, meaning 2 aluminum ions and 3 carbonate ions combine.
Write the chemical formula using the ratio found: Al_2(CO_3)_3, which shows 2 aluminum ions and 3 carbonate ions combined to form a neutral compound.
