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| Topic: |
Miscellaneous
|
| Number of pages / Number of words: |
12 / 3285 |
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The chart
Scenario System
(syst) Surroundings
(surr) Exothermic or
Endothermic Direction of
Energy Flow Energy
Conversion
* a) dissolving KBr water endothermic surroundings to system Ek Surr to Ep system
b) burning CH4 air in furnace exothermic system to surroundings Ep syst to Ek surr
c) dissociating H2SO4 water component of solution exothermic system to surroundings Ep syst to Ek surr
d) combustion of candle wax surrounding air exothermic system to surroundings Ep syst to Ek surr
e) melting ice water in glass endothermic surroundings to system Ek Surr to Ep syst
f) condensing water air in cloud exothermic system to surroundings Ep syst to Ek surr
g) your metabolic reactions air around you exothermic system to surroundings Ep syst to Ek surr
h) the chemical reaction immediate surroundings endothermic surroundings to system Ek Surr to Ep syst
yours
2...
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The equation for the fermentation of glucose to alcohol and carbon dioxide is
C6H12O6(s) -------> 2C2H5OH(l) + 2CO2(g)
a) The enthalpy change for the reaction is -68.1 kJ. Is the reaction exothermic or endothermic?
Ans: Its exothermic as you can tell from the negative sign on the energy term.
b) Is energy absorbed or released as the reaction proceeds? Explain how you know this...
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