Multiple Choice
What is the correct name for the ionic compound with the formula RbF?
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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 phosphide?
A
Ca2P
B
Ca2P3
C
Ca3P2
D
CaP2
Verified step by step guidance1
Identify the ions involved: calcium typically forms a Ca^{2+} ion, and phosphide is the P^{3-} ion.
Determine the ratio of calcium ions to phosphide ions needed to balance the charges so the compound is electrically neutral.
Set up the charge balance equation: (number of Ca^{2+} ions) \times (+2) + (number of P^{3-} ions) \times (-3) = 0.
Find the smallest whole number ratio of Ca^{2+} to P^{3-} ions that satisfies the charge balance. This ratio is 3 calcium ions to 2 phosphide ions.
Write the chemical formula using the ratio found: Ca_{3}P_{2}.
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