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Chemistry 30

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Thermodynamics: Unit Index | Practice Problems | Assignments | Student Lab | Research Ideas | Teacher Resources

 

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Thermodynamics

Answers to Practice Questions: Endothermic and Exothermic Reactions
   This worksheet is also available in the following formats:  Word | RTF | PDF
1. Identify each of the following reactions as exothermic or endothermic.
 
CH4(s) + 2O2(g) → CO2(g) + 2H2O(l) ΔH° = -890 kJ Exothermic
2HCl(g) → H2(g) + Cl2(g) ΔH° = 185 kJ Endothermic
4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(l) ΔH° = -1169 kJ Exothermic
2. When potassium nitrate dissolves in water, the beaker containing the solution gets cooler. Is dissolving this salt an exothermic or an endothermic process?
  This is an endothermic process. The reaction requires heat, which it absorbs from the surroundings (the water). This causes the water temperature to decrease.

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Credits | Central iSchool | Sask Learning | Saskatchewan Evergreen Curriculum | Updated: 15-Jun-2006