Multiple Choice
Which of the following is the correct chemical formula for aluminum chromate?
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 cobalt(II) bromide?
A
Co2Br
B
CoBr3
C
Co2Br3
D
CoBr2
Verified step by step guidance1
Identify the oxidation state of cobalt in cobalt(II) bromide. The Roman numeral II indicates that cobalt has a +2 charge, written as Co^{2+}.
Determine the charge of the bromide ion. Bromide is a halide ion with a charge of -1, written as Br^{-}.
To form a neutral compound, the total positive charge must balance the total negative charge. Since cobalt has a +2 charge and bromide has a -1 charge, two bromide ions are needed to balance one cobalt ion.
Write the chemical formula by combining one Co^{2+} ion with two Br^{-} ions, resulting in CoBr_{2}.
Verify that the formula is electrically neutral: (+2) + 2(-1) = 0, confirming that CoBr_{2} is the correct formula for cobalt(II) bromide.
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