Based on the enthalpy changes given for the reactions, which reactions are endothermic? 2H20 → 2H2 + O2, AH = 484 kJ
C + 02 → CO2, AH = -394 kJ
H2 + Br2 → 2HBr, AH = -73 kJ
2NH3 + N2 + 3H2, AH = 92 kJ

The diagram below shows the movement of particles. what does this piece of evidence best support? the collision theory the maxwell-boltzmann distribution the effect of pressure on reaction rates the effect of temperature on reaction rates