Equation a. C3H8(g) + O2(g) → CO2(g) + H2O(g) + 2220 kj is endothermic. + 2220 kj Equation b. 2 Na(s) + Cl2(g) → 2 NaCl(s) + 819kJ is also endothermic since the overall energy change is positive. + 819kJ The equation c. PCl5(g) + 67kj → PCl3(g) + Cl2(g) is endothermic since it requires anergy to proceed.
Hi, by definition an exothermic reaction is the one that generates heat as it occurs. An endothermic reaction on the other hand, consumes heat from the environment as it happens.
<u>This can be seen, when energy is put as a reactant in the equation. When it appears as a procuct the reaction is exothermic.</u>
The bonding of two atoms will most likely occur if A. a more stable state can result from the union. Otherwise, there would be no point in making two atoms bond.
