J Unit 4. Kinetics+Equilibrium 4.4 What is endothermic and exothermic reactions? March 15, 2011 Do...
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Transcript of J Unit 4. Kinetics+Equilibrium 4.4 What is endothermic and exothermic reactions? March 15, 2011 Do...
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J
Unit 4. Kinetics+Equilibrium4.4 What is endothermic and exothermic
reactions? March 15, 2011
Do Now:
Going over questions from yesterday
AIM: How do we distinguish between endothermic and exothermic reactions?
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ENDOTHERMIC REACTIONS
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DEFINITION
reactions that take in energy (heat)
heat is absorbed from the surroundings
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EXAMPLES
solid liquid (ice cream melting)
liquid gas (boiling water)
solid gas
melting
vaporization
sublimation
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Where is the heat?
• 2H2O(g) + heat ↔ 2H2(g) + O2(g)
• 2H2O(g) + 103 kJ ↔ 2H2(g) + O2(g)
• 2POCl3(g) + energy ↔ 2PCl3(g) + O2(g)
Circle where the heat is located. Indicate whether it is a reactant or a product
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KEY IDEA
endothermic reaction
sample absorbs heat
heat is on the left side (reactant side)
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EXOTHERMIC REACTIONS
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DEFINITION
Reactions that release energy (heat)
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EXAMPLE
gas liquid (rain)
liquid solid (making ice cubes)
gas solid
condensation
freezing
deposition
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Where is the heat?
• 8H2 + S8 8H2S + heat
• 8H2 + S8 8H2S + 1026 J
Circle where the heat is located. Indicate whether it is a reactant or a product
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KEY IDEA
exothermic reaction sample releases heat
heat is on the right side (product side)
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INDEPENDENT PRACTICE
1. To be collected at the end of CLASS!
2. COME SEE ME AFTER SCHOOL IF YOU NEED TO MAKE UP WORK!