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The flow of energy
main ideas and vocab- 17.1
18
Chemistry
11th Grade
05/13/2009

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Term
the study of energy changes that occur during chemical reactions and changes in state
Definition
thermochemistry
Term
energy stored in chemical bonds
Definition
chemical potential energy
Term
energy that rransfers from one object to another because of a temperature difference between two objects
Definition
heat
Term
from what and to where does heat flow?
Definition
from a hotter object to a coller object
Term
a part of the universe on which you focus your attention
Definition
system
Term
everything in the universe outside of the system
Definition
surroundings
Term
in any chemical or physical process, energy is neither created nor destroyed
Definition
law of conservation of energy
Term
a process that absorbs heat from the surroundings
Definition
endothermic process
Term
what happens during an endothermic process?
Definition
the system gains heat and the surroundings cool down
Term
a process that releases heat to its surroundings
Definition
exothermic process
Term
what happens during an exothermic process?
Definition
the system loses heat and the surrounds heat up
Term
what is heat flow measured in?
Definition
calories or joules
Term
1 joule= ? calories
Definition
0.2890
Term
1 calories= ? joules
Definition
4.184
Term
the amount of heat needed to increase the temperature of an object exactly 1 degree celsius
Definition
heat capacity
Term
what does the heat capacity of an object depend on?
Definition
the objects mass and chemical composition
Term
the amount of heat needed to increase the temperature of 1 g of substance one degree celsius
Definition
specific heat
Term
what is the specific heat of water?
Definition
4.18 J/(g times degreesC) or 1.00 cal/ (g times degrees C)
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