Which of the following is the formation reaction for CaO(s) ?
A. CaO(s) Ca(s) + 21O2(g)
B. Ca2+(aq) + O2–(aq) CaO(s)
C. 2 Ca(s) + O2(g) 2CaO(s)
D. Ca(s) + 21O2(g) CaO(s).
E. 2 CaO(s) 2 Ca(s) + O2(g)
I know that you have to create an equation and I believe that the CaO is on the right side, but when breaking up the parts on the left I think it is Ca and o2, but when I balance it I get C, but not sure if that is right.
You sound like you're on the right track but with no arrows your equations don't make sense. As for getting C, you CAN'T separate C from Ca.
A. Ca(s)+ 1/2O2(g)arrow Cao(s)
was A. right?
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To determine the formation reaction for CaO(s), we need to identify the reaction that represents the formation of CaO from its elements, calcium (Ca) and oxygen (O2). Formation reactions typically involve the combination of elements to form a compound.
Looking at the given options:
A. CaO(s) Ca(s) + 21O2(g)
This option shows the decomposition of CaO rather than its formation.
B. Ca2+(aq) + O2–(aq) CaO(s)
This option represents the reaction between calcium ions and oxygen ions to form CaO, which is not the formation reaction we are looking for.
C. 2 Ca(s) + O2(g) 2CaO(s)
This option represents the formation reaction for CaO. It shows the combination of calcium (Ca) and oxygen (O2) to form two moles of CaO.
D. Ca(s) + 21O2(g) CaO(s)
This option shows the decomposition of CaO rather than its formation.
E. 2 CaO(s) 2 Ca(s) + O2(g)
This option shows the decomposition of CaO rather than its formation.
Therefore, the correct answer is C. 2 Ca(s) + O2(g) 2CaO(s), as it represents the formation of CaO from calcium and oxygen.