—ANSWER—

1. Because as what the statement said that it's 36° it might be or for sure the reason why your room is warmer than usual even though your room is enclosed.
2. exothermic, because it reacts to the energy of what your surroundings is releasing. usually in the form of heat, but also in a form of light, electricity, or sound.
3. The rate of a reaction depends on the nature of the participating substances. Reactions that appear similar may have different rates under the same conditions, depending on the identity of the reactants. no, it is not safe.
4. Have your roof insulated, especially if you have bedrooms under the eaves.Properly insulated walls will protect you against the heat as well as against the cold.