Chapter 5 Flashcards
Thermochemistry
The relationships between chemical reactions and energy changes that involve heat
Thermodynamics
The study of energy and it’s transformations
The capacity to do work or transfer heat.
Energy
The energy used to cause an object to move against a force
Work
The energy used to cause the temperature of an object to increase
Heat
The energy of motion is called _______ energy
Kinetic
The magnitude of kinetic energy of an object is given by:
Ek=.5mv^2
V=speed
The kinetic energy of an object ______ as its speed increases
Increases
Potential energy is
Energy that’s determined by an objects position
Gravity is ________ in reactions involving atoms and molecules
Unimportant
Eel=
electrostatic energy
electrostatic energy equation
Eel=(kQ1*Q2)/d
D=distance
K=proportionality constant
q’s are two objects
K constant=
8.99*10^9 J-m/C^2
C usually stands for ______
Coulomb
1 cal= _____J
4.184
Calorie = _____ calorie
1000
The portion we single out for study is called ____ everything else is called ______
System
Surroundings
An open system
Is a system in which matter and energy can be exchanged with the surroundings
Closed systems are more useful for study because ____
They exchange only heat rather than matter as well
Work=______
F*d
F= force d= distance object moves
The other way energy is transferred is through ____
Heat
First law of thermodynamics
Energy can neither be created nor destroyed.
Internal energy is denoted by ___
E
Change in interanl energy=
DeltaE= Efinal-Einitial
