Chapter 9 Thermodyamics Lecture 2

Question 1

Chemical Reactions

Answer 1

involves breaking and forming chemical bonds, resulting in a change of chemical energy.
Chemical energy decreasing= Energy converted to thermal energy = Temp increases releases onto surroundings

Question 2

Heat of Reaction

Answer 2

(q,rxn) Heat resulting from chemical reactions within the system

Question 3

Exothermic reactions

Answer 3

System releases heat. CE -> TE
Temp increases. Heat is released to surroundings q;rx<0

Question 4

Endothermic reaction

Answer 4

System absorbs heat: TE-> CE.
Temp decreases. Heat is absorbed into system. qrxn >0

Question 5

Bomb calorimeter

Answer 5

Constant-volume calorimeter that is used to measure the heat of combustion. Formula Qcal=-Qrxn Temp of Calorimeter increases: Qxn= Ccal (Tf-Ti)

Question 6

Pressure-Volume Work

Answer 6

Type of work done by the external pressure through volume change
Formula w= -P(Vf-Vi)

Question 7

Different types of Work

Answer 7

System does work on the surrounding.
Volume = + w=P(Vf-Vi) = -
Surrounding does work on the system: Volume = - w= -P(Vf-Vi) = +