Ch.6 Thermochemistry

Question 1

chemical energy

Answer 1

energy stored within the chemical substances

Question 2

heat

Answer 2

transfer of thermal energy between two bodies that are at different temp.

Question 3

Thermal energy

Answer 3

random motion of atoms and molecules

motion is involved with heat

Question 4

temp.

Answer 4

measure of thermal energy

Question 5

thermochemistry

Answer 5

study of heat change in chemical reactions

Question 6

exothermic

Answer 6

give off heat
2H2(g) + O2 (g)–> 2H2O(l)+ energy
H2O(g)–>H2O(l)+energy

Question 7

Endothermic process

Answer 7

heat has to be supplied to the system

Question 8

thermodynamics

Answer 8

scientific study of the interconversion of heat and other kinds of energy

Question 9

state functions

Answer 9

final minus intial

Question 10

first law of thermodynamics

Answer 10

it can’t be created or destroyed

Question 11

delta U

Answer 11

q+w

Question 12

change in the internal energy of a system

Answer 12

delta U

Question 13

heat exchange between the system and the surroundings

Answer 13

q

Question 14

work done on (or by) the system

Answer 14

w

Question 15

w =

Answer 15

-P delta V when a gas expands against a constant external pressure

Question 16

work done by the system on the surr.

Answer 16

-

Question 17

work done on the system by the surr.

Answer 17

+

Question 18

Heat absorbed by the system from the surroundings (endothermic process)+

Answer 18

Heat absorbed by the surroundings from the system (exothermic process)