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14 Cards in this Set
- Front
- Back
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Physical and Chemical Changes are always accompanied by
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energy changes
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system
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any “piece” of the universe under consideration
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surroundings
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everything else
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Energy is usually transferred as
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heat (q)
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SI unit measured in
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joules (J)
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1 dietary Calorie=
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1kcal
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4.184J=
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1 cal
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endothermic
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absorbs heat 1.products have more energy than the reactants (this reaction feels COLD!!)
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exothermic
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releases heat 1.reactants are higher in energy than the products(this reaction feels HOT!!)
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activation energy
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the minimum amount of energy required to start a chemical reaction
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energy changes are measured in a
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calorimeter 1.assume that no heat is lost or gained by the surroundings
2.heat gained=heat lost |
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specific heat capacity
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the amount of energy required to raise the temp of on gram of a substance 1 degree Celsius
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1.q=m∆TCp
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1.q- heat gained or lost
2.∆T change in temp 3.Cp= specific heat capacity |
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the specific heat of water
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4.184J/gºC
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