Are these endothermic or exothermic? 1.A red glow spread throughout the mixture and the temperature rose. 2.The mixture bubbled vigorously but the temperature dropped 15 0 C. 3.Hydrazine and hydrogen peroxide react so explosively and powerfully that they are used to power rockets into space. 4.The decaying grass in the compost maker was considerably above the outside temperature. exo endo exo Activity
Catalysts For chemical reactions to occur: Existing bonds have to begin breaking so that new ones can be formed. The molecules have to collide in such a way that the reacting parts of the molecules are brought together. Catalysts can help with either or both of these processes. A catalyst is a substance that speeds up a reaction without getting used up in the process.