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AP Chemistry > Topic 4- Lecture 15 > Flashcards

Topic 4- Lecture 15 Flashcards

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1
Q

A form of energy measured in J

A

Heat

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2
Q

Measure of the average KE of atoms and molecules in a system

A

Temperature

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3
Q

KE increases as…

A

Temperature and velocity increase

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4
Q

Distribution of KEs ___________ as temperature increases

A

Increases

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5
Q

Two systems at different temperature that are in ___________________ with one another will ______________________.

A

Thermal contact

Exchange energy/ heat

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6
Q

Transferred from high to low

A

Temperature

Energy

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7
Q

Same temp

A

Thermal equilibrium

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8
Q

Conservation of energy

A

Energy cannot be created or destroyed, but can be transformed from one form to another

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9
Q

System

A

Actual chemical reaction that is taking place

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10
Q

Surroundings

A

Anything other than the system

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11
Q

Change in a systems internal energy

A 
ΔE= q+w
ΔE= E final- E initial
Change in energy
Heat that is transferred
Work done on the system by surroundings
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12
Q

In an isolated system, energy is_____________

A

Conserved

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13
Q

Endothermic reaction

A

Heat goes into system, feels cold

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14
Q

Ectothermic reaction

A

Heat leaves the system, feels hot

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15
Q

Work equation

A

w= -PΔV
Work
Negative pressure
Change in volume

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16
Q

Work endothermic process

A

Collisions increase
Concentration increases
Volume decreases
Pressure increases

17
Q

Work exothermic process

A

Collisions decrease
Concentration decreases
Collisions decrease
Pressure decreases

18
Q

Enthalpy

A

Heat that is released or absorbed in a chemical reaction

ΔH

19
Q

Enthalpy equations

A 
ΔH= H products- H reactants
ΔH= ΣBE (bonds broken) - ΣBE (bonds formed)
20
Q

Energy is always ______________ during the FORMATION of a bond

A

Released

21
Q

The same amount of energy must be _____________ to break that specific bond

A

Added/ absorbed

22
Q

More energy released during the formation of the bonds than required to break the reactants

A

Exothermic

-

23
Q

Less energy released during the formation of the bonds than required to break the bonds of reactants

A

Endothermic

+

24
Q

Lewis dot structures when calculating ΔH

A

Reactants - products

25
Q

Thermodynamics is the…

A

Relationship between chemical reactions and heat

AP Chemistry (15 decks)

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