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  2.  
  3. PEARSON (PEARSON)
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  5. Chemistry 2015
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  7. Unit 8 - Energetics I (9CH0)

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Summary Energetics I
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Detailed notes on energetics I. Notes written using Edexcel Chemistry textbooks, past papers and more. Written by a student with all A*s at GCSE, 3A* predictions at A Level and with an offer for Natural Sciences at Cambridge.

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  • Energetics i
  • March 30, 2020
  • 4
  • 2019/2020
  • Summary

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Topic 8: Energetics I
1. know that standard conditions are 100 kPa and a specified temperature,
usually 298 K
Standard Conditions
Temperature: 298K
Pressure: 100kPa

Standard conditions are used to show enthalpy changes because they are affected by
temperature and pressure. H means the measurements were taken under standard
conditions.

2. know that the enthalpy change is the heat energy change measured at
constant pressure
Enthalpy change H: the heat change in a reaction at a constant pressure (kJ/mol)

Endothermic: reactions absorb heat energy so H is positive
 indicated by a decrease in temperature
 when bonds are broken
 CaCO3(s)  CaO(s) + CO2(g) rH = +178 kJ/mol
Exothermic: reactions release heat energy so H is negative
 indicated by an increase in temperature
 when bonds are made
 CH4(g) + 2O2(g)  CO2(g) + 2H2O(l) cH = -890kJ/mol



3. be able to construct and interpret enthalpy level diagrams showing an
enthalpy change, including appropriate signs for exothermic and
endothermic reactions
Endothermic Exothermic


Enthalpy
level
diagram




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