Which of the following reactions is an example of an endothermic reaction?
A. H2O(l) + energy → 2H2(g) + O2(g)
B. 2H2(g) + O2(g) → 2H2O(g) + energy
C. CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)
D. Na(s) + Cl2(g) → 2NaCl(s) + energy
A. H2O(l) + energy → 2H2(g) + O2(g)
B. 2H2(g) + O2(g) → 2H2O(g) + energy
C. CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)
D. Na(s) + Cl2(g) → 2NaCl(s) + energy