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34 Cards in this Set
- Front
- Back
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A system is defined as |
The substance or substances under study |
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Surroundings are defined as |
Anything and everything else |
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I'm respect to systems and surroundings, which perspective do you ALWAYS take? |
The perspective of the system |
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Energy change is a(n) _________ property |
Extensive |
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q stands for |
Heat |
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For an endothermic process, the q value is... |
Positive |
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For an exothermic process, the q value is... |
Negative |
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q sub p is equal to... |
Change in heat |
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What is enthalpy? |
The property of a substance that can be used to obtain the heat absorbed or released in a change at a constant pressure |
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What is also known as the capacity to exchange heat? |
Enthalpy |
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The enthalpy depends on only the _______________________, not ______________ |
current state, how it got there |
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True or False: There is no natural benchmark for 0 enthalpy |
True |
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Enthalpy can be measured _____________, but not ___________ |
relatively, absolutely |
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What is energy? |
The ability to do work or produce heat |
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What is the equation for work? |
Force x Pressure |
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What are the equations for kinetic and potential energy? |
KE: 1/2 x mass x velocity squared PE: mass x 9.8 m/s squared x distance |
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What is the equation for work done by an expanding gas? |
-P x the change in V |
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If work is done BY the system, the w value is... |
negative |
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If work is done ON the system, the w value is... |
positive |
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If heat is ABSORBED by the system, the q value is... |
positive |
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If heat is RELEASED by the system, the q value is... |
negative |
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What is heat? |
The flow of energy due to temperature differences |
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What is temperature? |
the measure of the average KE of a substance's particles as they move |
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True or false: Heat and Temperature are the same thing |
False |
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True or False: Different masses of substances will achieve different temperatures with the same amount of heat |
True |
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True or False: Substances undergoing phase changes remain at the same temperature even though heat is continually being pumped into the system |
True |
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True or False: The same masses of different substances will achieve different temperatures when the same amount of heat is applied |
True |
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What is a calorie? |
The energy required to raise 1 gram of water by 1 degree celsius |
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how do you find q using calories? |
q= mass x specific heat (Joules per gram degree celsius) x the change in temperature |
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1 Calorie = _____ calories? |
1000 |
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1 calorie=_______ joules? |
4.184 |
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1 Joule=_______ kg m squared/second squared? |
1 |
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How many calories does it take to boil 1 gram of water and what is it called? |
540 calories, heat of vaporization |
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Why did the peanut's expected calorie output not equal the amount that was calculated? |
Because heat was lost the environment |
