Scelta multipla
Which of the following is the correct chemical formula for zinc(II) iodide?
172
views
3. Chemical Reactions
Naming Ionic Compounds
Scelta multipla
Which is the correct chemical formula for the ionic compound formed from aluminum (Al) and selenium (Se) atoms?
A
Al3Se2
B
AlSe
C
Al2Se3
D
AlSe2
Guida verificata passo dopo passo1
Identify the charges of the ions formed by aluminum and selenium. Aluminum typically forms a +3 charge (Al^{3+}), and selenium typically forms a -2 charge (Se^{2-}).
Determine the ratio of aluminum ions to selenium ions needed to balance the total positive and negative charges so that the compound is electrically neutral.
Set up the charge balance equation: (number of Al ions) \(\times\) (+3) + (number of Se ions) \(\times\) (-2) = 0.
Find the smallest whole number ratio of Al to Se that satisfies the charge balance. This involves finding the least common multiple of the charges 3 and 2, which is 6.
Write the chemical formula using the ratio found: the number of Al atoms corresponds to the number of Al^{3+} ions, and the number of Se atoms corresponds to the number of Se^{2-} ions, resulting in Al_{2}Se_{3}.
Video correlati
Pratica correlata
