Consider the equation:

Question

Ca+O2→CaO

What needs to be done in order to balance the equation?

Responses

Place a 2 in front of the CaO only.
Place a 2 in front of the , Upper case C lower case a upper case O, only.

Place a 2 in front of the Ca and the CaO.
Place a 2 in front of the , Upper case C lower case a, and the , Upper case C lower case a upper case O, .

Place a 2 in front of the O2 and the CaO.
Place a 2 in front of the , upper case O subscript 2 end subscript, and the , Upper case C lower case a upper case O, .

Place a 2 only in front of the Ca.

Answer 1

Place a 2 in front of the O2 and the CaO.