Chapter 10

Question 1

Thermochemistry

Answer 1

study of heat (transfer of thermal energy) in chemical reactions

Question 2

unit for heat

Answer 2

Joule (J), calorie, Calorie

Question 3

Exothermic Process,

Answer 3

Releases heats from system to surroundings, products have less energy than reactants

Question 4

Endothermic Process

Answer 4

Absorbs heat from surroundings to system, products have more energy than reactants

Question 5

Open system

Answer 5

Can exchange mass and energy with surroundings

Question 6

Closed system

Answer 6

Can exchange energy with surroundings

Question 7

Isolated system

Answer 7

Cannot exchange energy or mass with surroundings

Question 8

State functions

Answer 8

properties determined by the state of the system, not on how it was achieved, pressure, energy, volume, temperature

Question 9

First law of thermodynamics

Answer 9

energy can be converted and transferred, but not created or destroyed

Question 10

Delta U stands for

Answer 10

change in internal energy of the system

Question 11

Delta Usys + delta Usurr = ?

Answer 11

0

Question 12

Delta Usys = -?

Answer 12

DeltaUsurr

Question 13

Delta U =

Answer 13

q (heat) + w (work)

Question 14

when is q (heat) positive or negative?

Answer 14

positive (endothermic), negative (exothermic)

Question 15

when is w (work) positive or negative?

Answer 15

positive (work done by surroundings), negative (work done by system)

Question 16

Under constant volume conditions, _______ _______.

Answer 16

pressure increases.

Question 17

Under constant pressure conditions, ______ _______.

Answer 17

volume increases.

Question 18

PV work

Answer 18

Pressure volume work, when there is A volume change under constant pressure, w=-P(delta V)

Question 19

Expansion

Answer 19

work done by a gas

Question 20

Compression

Answer 20

work done on a gas

Question 21

How to know if a reaction is undergoing an expansion or compression?

Answer 21

Expansion: coefficients of reactants is smaller than products. Compression: coefficients of reactants is larger than products

Question 22

equation of pressure volume when no change in volume

Answer 22

w=-P(deltaV)
deltaU= q+w
deltaU= q - P(detaV)
deltaU= q-P(0)
deltaU=q
q(subscript V)=delta U

Question 23

equation for delta H (enthalpy)

Answer 23

delta H= delta V + pdeltaV