Answer:
A. Left: 2 Al Atoms Right: 2 Al atoms.
B. Left: 3 Cu atoms. Right: 3 Cu atoms
C. Left: 3 O atoms Right: 3 0 atoms
D. Yes (Balanced).
Step-by-step explanation:
Left side of equation, the coefficients or the Al atom is 2 and there are no Subscripts. Making it 2x1 for the Al atom.
This can be applied the same way for the rest of the Left side.
On the Right side, there are no coefficients for Al atoms and O atoms. The subscription (2 & 3) for the atoms are the appropriate amount. Cu has no subscript, making the coefficient the amount of that atom.