.ClaRa.Basics.ControlVolumes.GasVolumes.VolumeGas_L2_chem.ChemicalReactions .ClaRa.Basics.ControlVolumes.GasVolumes.VolumeGas_L2_chem.ChemicalReactions1st: choose chemical reaction model | 2nd: edit corresponding record
model ChemicalReactions = ClaRa.Basics.ControlVolumes.Fundamentals.ChemicalReactions.NoReaction_L2;