In which type of chemical reaction is heat absorbed from the surroundings?
Endothermic reaction absorbs heat.
Breaking bond is endothermic reaction. If you take a look at the graph of endothermic reaction (google it), you will find out that the energy level of the product is higher than the energy level of the reaction. This means that energy is taken in during the reaction and conserved in the product. The ∆H (enthalpy) is therefore positive. You can Google the term to have a clearer explanation.