• Chemical reactions transfer energy between system and surroundings
• Total energy conserved
• Heat vs. temperature
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Mastery
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Attempts
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Mistakes
Start with the concept explanation, then practise to create mastery evidence.
2
Learning objective
1.1.2—Endothermic vs. exothermic
New
• Endothermic: energy absorbed (T decreases)
• Exothermic: energy released (T increases)
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Mastery
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Attempts
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Mistakes
Start with the concept explanation, then practise to create mastery evidence.
3
Learning objective
1.1.3—Stability and energy
New
• Relative stability determines endo/exothermic nature
• Energy profiles
• Sketch and interpret labelled energy profiles for endothermic and exothermic reactions
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Mastery
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Attempts
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Mistakes
Start with the concept explanation, then practise to create mastery evidence.
4
Learning objective
1.1.4—Standard enthalpy change (ΔH⦵)
New
• Heat transferred at constant pressure, standard conditions
• Q = mcΔT
• ΔH = −Q/n
• Calculate enthalpy change from calorimetry data
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Mastery
0
Attempts
0
Mistakes
Start with the concept explanation, then practise to create mastery evidence.