Based on the enthalpy changes given for the reactions, which reactions are endothermic?
2h2o → 2h2 + o2, δh = 484 kj
c + o2 → co2, δh = -394 kj
h2 + br2 → 2hbr, δh = -73 kj
2nh3 → n2 + 3h2, δh = 92 kj

If you burn 10 kilograms of wood in a fire (combustion) what is the weight of the products after the fire has finished burning the wood?

Draw metallic bonding if two copper

Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.