Answer:
CaCO[tex]_{3s}[/tex] → CO[tex]_{2g}[/tex] + CaO[tex]_{s}[/tex]
Explanation:
Given reactants:
Omar heated small piece of calcium carbonate
Product;
it gave off carbon dioxide gas and solid calcium oxide;
Problem,
Equation of the reaction;
Solution:
Calcium carbonate → Carbon dioxide + Calcium oxide
CaCO[tex]_{3s}[/tex] → CO[tex]_{2g}[/tex] + CaO[tex]_{s}[/tex]