CHEM 121 THERMODYNAMICS FINAL EXAM | UPDATED
QUESTIONS AND ANSWERS UPDATED .Buy Quality Materials!
Thermochemistry
the study of chemical reactions and the correlated changes in energy
Energy
the capacity to do work or supply heat
mechanical energy
energy due to motion or position. The sum of potential energy and kinetic energy
potential energy
Energy due to an objects position relative to other objects
Kinetic energy
energy due to motion
Joule (J)
SI unit of energy. equal to the amount of energy required to move 1kg mass a distance
of 1 meter
Calorie (cal)
common unit of energy. Equal to the amount of energy required to raise the temperature
of 1g of water by 1°C
kcal
1000 calories. Energy needed to raise the temperature of 1000g of water by 1°C.
(Calories in food)
System
a well defined part of the universe and the source of energy being studied
surroundings
everything else (rest of the universe)
open system
can exchange matter and energy with surroundings
closed system
can exchange energy but not matter with surroundings
isolated system
cannot exchange matter and energy with surroundings
heat (q)
thermal energy transferred between a system and its surroundings
work(w)
the energy resulting from a force acting on an object
exothermic
heat flows out of the system and into the surroundings
endothermic
heat flows into system from the surrounds
Ex) cooking egg
endothermic
ex) melting ice cubes
endothermic
QUESTIONS AND ANSWERS UPDATED .Buy Quality Materials!
Thermochemistry
the study of chemical reactions and the correlated changes in energy
Energy
the capacity to do work or supply heat
mechanical energy
energy due to motion or position. The sum of potential energy and kinetic energy
potential energy
Energy due to an objects position relative to other objects
Kinetic energy
energy due to motion
Joule (J)
SI unit of energy. equal to the amount of energy required to move 1kg mass a distance
of 1 meter
Calorie (cal)
common unit of energy. Equal to the amount of energy required to raise the temperature
of 1g of water by 1°C
kcal
1000 calories. Energy needed to raise the temperature of 1000g of water by 1°C.
(Calories in food)
System
a well defined part of the universe and the source of energy being studied
surroundings
everything else (rest of the universe)
open system
can exchange matter and energy with surroundings
closed system
can exchange energy but not matter with surroundings
isolated system
cannot exchange matter and energy with surroundings
heat (q)
thermal energy transferred between a system and its surroundings
work(w)
the energy resulting from a force acting on an object
exothermic
heat flows out of the system and into the surroundings
endothermic
heat flows into system from the surrounds
Ex) cooking egg
endothermic
ex) melting ice cubes
endothermic
