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Measuring Enthalpy Changes - Reactivity 1.1 [2025] IB CHEM SL/HL
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1.1.1—Chemical reactions involve a transfer of energy between the system and the
surroundings, while total energy is conserved.
1.1.2—Reactions are described as endothermic or exothermic, depending on the
direction of energy transfer between the system and the surroundings.
1.1.3—The relative stability of reactants and products determines whether reactions are
endothermic or exothermic.
1.1.4—The standard enthalpy change for a chemical reaction, ΔH ⦵, refers to the heat transferred at constant pressure under standard conditions and states. It can be determined from the change in temperature of a pure substance.
surroundings, while total energy is conserved.
1.1.2—Reactions are described as endothermic or exothermic, depending on the
direction of energy transfer between the system and the surroundings.
1.1.3—The relative stability of reactants and products determines whether reactions are
endothermic or exothermic.
1.1.4—The standard enthalpy change for a chemical reaction, ΔH ⦵, refers to the heat transferred at constant pressure under standard conditions and states. It can be determined from the change in temperature of a pure substance.
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Measuring Enthalpy Changes - Reactivity 1.1 [2025] IB CHEM SL/HL
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