Multiple Choice
Which pair of elements could readily form an ionic compound?
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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 phosphate?
A
Ca(PO4)2
B
Ca3(PO4)2
C
CaPO4
D
Ca2(PO4)3
Verified step by step guidance1
Identify the ions involved: calcium ion (Ca^{2+}) and phosphate ion (PO_4^{3-}).
Determine the ratio of calcium ions to phosphate ions needed to balance the charges so the compound is electrically neutral.
Set up the charge balance equation: 3 calcium ions (3 \times +2 = +6) will balance with 2 phosphate ions (2 \times -3 = -6).
Write the chemical formula using the ratio found: Ca_3(PO_4)_2, indicating 3 calcium ions and 2 phosphate ions.
Verify that the total positive and negative charges cancel out, confirming the formula is electrically neutral.
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