Extended curriculum 4 The fuel natural gas is mostly methane. Its combusion in oxygen is exothermic: CH, (g) + 20, (g) →

[answerhappygod]

Extended Curriculum 4 The Fuel Natural Gas Is Mostly Methane Its Combusion In Oxygen Is Exothermic Ch G 20 G 1 (44.79 KiB) Viewed 36 times

Extended curriculum 4 The fuel natural gas is mostly methane. Its combusion in oxygen is exothermic: CH, (g) + 20, (g) →→CO, (g) + 2H20 (1) a Explain why this reaction is exothermic, in terms of bond breaking and bond making. bi Copy and complete this energy diagram for the reaction, indicating: A the overall energy change B the energy needed to break bonds C the energy given out by new bonds forming. energy CH(g) +202 ) . ii Methane will not burn in air until a spark or flame is applied. Why not? c When 1 mole of methane burns in oxygen, the energy change is - 890 kJ. i What does the - sign tell you? ii Which word describes a reaction with this type of energy change? d How much energy is given out when 1 gram of methane burns? (A: C = 12, H = 1.)