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CHEM 125 Cal Poly Exam Questions AND Correct Answers

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CHEM 125 Cal Poly Exam Questions AND Correct Answers

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CHEM 125 Cal Poly Exam Questions AND Correct Answers
1. How does matter possess energy? - ✔✔Kinetic Energy (KE):
the energy an object possesses by virtue of its motion.


Potential Energy (PE): the energy an object possesses as a
result of its composition or its position.


2. How is energy transferred? - ✔✔Law of conservation of
energy


Calorimetry - ✔✔- (Cs x m x ΔT) rxn = (Cs x m x ΔT) soln


Calorimetry - ✔✔The heat gained by the calorimeter = heat
lost by the chemical system
The heat lost by the calorimeter = heat gained by the chemical
system


Endothermic processes - ✔✔Energy (heat) is absorbed
Breaking chemical bonds
Ice melting
Baking cookies

, Anything that absorbs energy
Positive (+) enthalpy


Endothermic reaction: - ✔✔System has gained energy.
ΔH is positive
q is positive


Exothermic processes - ✔✔Energy (heat) is given off
Making chemical bonds
Ice freezing
Metabolism of sugar
Combustion Reactions
Anything that produces energy
Negative (-) enthalpy


Exothermic reaction: - ✔✔System releases energy to
surroundings.
ΔH is negative
q is negative

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