Multiple Choice
Which of the following is the correct chemical formula for chromium(III) oxide?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for the ionic compound formed between calcium ions and bromide ions?
A
CaBr2
B
Ca2Br
C
CaBr
D
Ca2Br2
Verified step by step guidance1
Identify the charges of the ions involved: calcium ions typically have a charge of +2 (Ca^{2+}), and bromide ions have a charge of -1 (Br^{-}).
Determine the ratio of ions needed to balance the overall charge of the compound so that it is electrically neutral.
Since calcium has a +2 charge and bromide has a -1 charge, two bromide ions are needed to balance one calcium ion, resulting in the formula CaBr_{2}.
Write the chemical formula by placing the symbol of the cation (calcium) first, followed by the symbol of the anion (bromide) with the appropriate subscript indicating the number of ions.
Verify that the total positive charge equals the total negative charge to confirm the compound is neutral: (1 imes +2) + (2 imes -1) = 0.
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