Calcium carbonate can break down to form calcium oxide and carbon dioxide.
CaCO3 → CaO + CO2
The oxygen atoms on the product side are
a) not balanced because there are only two oxygen atoms in CO2
b) not balanced because there is only one oxygen atom in CaO.
c) balanced because the total number of oxygen atoms is 3.
d) balanced when a coefficient of 3 is placed in front of CO2.
C.balanced because the total number of oxygen atoms is 3.
Such a reaction is said to be endothermic if the energy is in the form of heat. ... hydrogen and oxygen and the formation of a metal oxide such as calcium oxide ( CaO) ...
The answer is,
C. balanced because the total number of oxygen atoms is 3.
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The answer to your question is the third choice.
CaCO₃ ⇒ CaO + CO₂
Check if the reaction is balanced or unbalanced
Reactants Elements Products
1 Calcium 1
1 Carbon 1
3 Oxygen 3
As the number of atoms in the reactant is the same that the number of atoms in the products we conclude that the reaction is balanced.
So the correct answer is balanced because the total number of oxygen atoms is 3.