Multiple Choice
What is the correct name for the ionic compound formed between magnesium and sulfur atoms?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for calcium hydroxide?
A
Ca2O
B
Ca(OH)2
C
CaOH
D
CaH2O2
Verified step by step guidance1
Identify the ions involved: Calcium typically forms a Ca^{2+} ion, and the hydroxide ion is OH^{-}.
Determine the ratio of ions needed to balance the charges so that the compound is electrically neutral.
Since calcium has a +2 charge and hydroxide has a -1 charge, two hydroxide ions are needed to balance one calcium ion.
Write the chemical formula by placing the calcium ion first, followed by the hydroxide ion in parentheses with a subscript 2 to indicate two hydroxide ions: $Ca(OH)_2$.
Verify that the formula reflects the correct ratio and charge balance, confirming that $Ca(OH)_2$ is the correct formula for calcium hydroxide.
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