74 Days Until the Final
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Transcript of 74 Days Until the Final
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74 Days Until the Final
1. What does the Latin root exo- mean?
2. What does the Latin root endo- mean?
End
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Today’s Learning Targets 7.1 – I can describe how the motion of
molecules relates to temperature. For example, if I have a hot solution and a cold solution, I can explain the motion in the molecules in each one of these solutions.
7.2 – I can compare and contrast the ideas of an exothermic reaction and an endothermic reaction.
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Today’s Focus Question
Does the breakdown of Flamin’ Hot Cheetos require energy or release energy?
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Review of Heat and Temperature Heat is the transfer of energy between
substances due to a difference in temperature
The faster a substance is moving the higher its temperature will be.
A substance at a high temperature has fast moving molecules and a substance at a low temperature has slow moving molecules
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Exothermic Reactions A reaction that releases
energy during the reaction is known as an exothermic reaction.
Energy often given off in the form of heat
Energy listed as a product in the equation
Reactants Products + Energy
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Endothermic Reactions
A reaction that requires energy during the reaction is known as an endothermic reaction.
Energy often absorbed in the form of heat, so the substance feels cold
Energy listed as a reactant in the equation
Energy + Reactants Products
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Phase Changes are Exo- and Endothermic!
Absorbs Energy
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Phase Changes are Exo- and Endothermic!
Release Energy
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Class Example Is the following reaction endothermic or
exothermic?
NH4NO3 + 453 kJ/mol HNO3 + NH3
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Table Talk Is the following reaction endo- or
exothermic?
2H2 + O2 → 2H2O + 484 kJ/mol
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Table Talk I have a pot of water and I heat it up until it
turns into gas. Is this an endothermic or exothermic process?
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Stop and Jot You have a test tube where you run the
reaction. If the test tube is hot following the reaction, then is this endothermic or exothermic?
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The Breakdown of Cheetos in Our Bodies
Before we can use food it needs to be converted to glucose.
Glucose is the only usable form that we humans can use to make ATP.
C6H12O6 (aq) + 6O2 (g) → 6CO2 (g) + 6H2O (l) + 2880 kJ/mol
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Summarize
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Work TimeComplete the worksheet with
your table.
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Exit Slip Elephant Toothpaste Chemistry: Ever wanted to
make elephant toothpaste?
The overall equation for this reaction is:
2 H2O2(aq) --> 2 H2O(l) + O2(g) + 4080 kJ/mol
However, the decomposition of the hydrogen peroxide into water and oxygen is catalzyed by the iodide ion.
H2O2(aq) + I-(aq) --> OI-(aq) + H2O(l) + 2000 kJ/mol
H2O2(aq) + OI-(aq) + 1500 kJ/mol --> I-(aq) + H2O(l) + O2(g)
WHICH OF THE THREE ARE ENDOTHERMIC AND WHICH ARE EXOTHERMIC? HOW DO YOU KNOW? (2 SENTENCES)
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Closing Time No Homework tonight!