Scelta multipla
Which of the following is the correct chemical formula for copper(II) oxide?
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3. Chemical Reactions
Naming Ionic Compounds
Scelta multipla
Which of the following is the correct chemical formula for calcium phosphate?
A
CaPO4
B
Ca3(PO4)2
C
Ca2(PO4)3
D
Ca(PO4)2
Guida verificata passo dopo passo1
Identify the ions involved: calcium typically forms a Ca^{2+} ion, and phosphate is the polyatomic 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: let the number of calcium ions be x and phosphate ions be y, then 2x (from Ca^{2+}) + (-3y) (from PO_4^{3-}) = 0.
Find the smallest whole number ratio of x to y that satisfies 2x = 3y, which leads to x = 3 and y = 2.
Write the chemical formula using the ratio found: Ca_3(PO_4)_2, indicating 3 calcium ions and 2 phosphate ions combined to form calcium phosphate.
