Multiple Choice
What is the correct name for the compound with the formula Al(NO3)3?
2
views
3. Chemical Reactions
Naming Ionic Compounds
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following is the correct chemical formula for calcium oxide?
A
Ca_2O
B
CaO
C
CaO_2
D
Ca_2O_3
Verified step by step guidance1
Identify the elements involved: calcium (Ca) and oxygen (O).
Determine the common charges (oxidation states) of each element: calcium typically forms a +2 charge (Ca^{2+}), and oxygen typically forms a -2 charge (O^{2-}).
To form a neutral compound, the total positive charge must balance the total negative charge. Since Ca^{2+} and O^{2-} have charges of equal magnitude but opposite sign, they combine in a 1:1 ratio.
Write the chemical formula by placing the symbols of calcium and oxygen with their respective subscripts reflecting the ratio needed to balance charges. Since the charges are equal and opposite, the formula is CaO.
Verify that the formula is electrically neutral by confirming that the sum of the charges from calcium and oxygen equals zero.
2:11mWatch next
Master Ionic Compounds Naming with a bite sized video explanation from Jules
Start learningRelated Videos
Related Practice
Naming Ionic Compounds practice set
Problem sets built by lead tutorsExpert video explanations