When sweat evaporates from your skin, the sweat underwent what process? exothermic false endothermic true both exothermic and endothermic false neither endothermic nor exothermic false false 0 Single 0 When the gas inside a chamber is said to be under isochoric conditions: Its volume is fixed. true Its pressure is fixed. false Its temperature is fixed. false Its concentration is fixed. false false 0 Single 0 What do you call the heat that flows between a system and its surroundings when it undergoes a change in internal energy? entropy false enthalpy true enmity false exothermy false false 0 Single 0 Which process shows a negative change in enthalpy? all endothermic processes false all exothermic processes true some endothermic processes false some exothermic processes false false 0 Single 0 Which of the following chemical reactions is exothermic? the reaction of sodium with chlorine true the dissolution of sodium chloride false the denaturation of albumin false the electrolysis of water false false 0 Single 0 What is bond enthalpy? the energy needed to transform an exothermic process to an endothermic process false the energy needed to isolate a system from its surroundings false the energy needed to overcome intermolecular forces false the energy needed to break bonds between atoms in a molecule true false 0 Single 0 When a bond between hydrogen and oxygen forms: there is a release of energy true there is an absorption of energy false the resulting molecule exchanges energy with its surroundings false the resulting molecule remains isolated from its surroundings false false 0 Single 0 For a reaction to be considered exothermic: all its reaction steps must involve a release in heat false at least one of its reaction steps must involve releasing heat false it should have a net heat release true it should remain a closed system false false 0 Single 0 What is the standard enthalpy of formation of the element carbon? 0 kJ/mol true always less than zero false always greater than zero false 19.3 kJ/mol false false 0 Single 0 Which of the following statements reflect Hess' Law? The enthalpy changes of individual steps of a reaction can be added. true The enthalpy changes of individual steps of a reaction can be added. false The change in enthalpy of a reaction is constant. false Enthalpy changes are irreversible. false false 0 Single 0