Lec 26 Calorimetry

Question 1

What is specific heat capacity (c), what are the units

Answer 1

Amount of heat needed to raise temp of 1g of material by 1 degree or K (no need to convert temp)

Intensive property

J/gC* or J/gK

Question 2

What does mc=

Also q/T

Answer 2

heat capacity (C)

Question 3

What is a calorimeter

Answer 3

Device used to measure heat involved in chemical reaction or physical process

Question 4

qrxn is equal to what in relation to a calorimeter

Answer 4

-q calorimeter

Heat of rxn is equal to negative heat of calorimeter

Question 5

What is bomb calometry

Answer 5

Measuring heat at constant volume (qv)
Work =0 bc no push or pull since wall is rigid
So delta U= qv

Question 6

What is Enthalpy defined as
What is it under isobaric conditions (constant pressure)

Answer 6

Called heat/Enthalpy of rxn

Measure of total heat content of system

H= U+PV

Isobaric: Delta H= qp

Question 7

What is delta H close to in a chemical rxn

Answer 7

Delta U, the diff between Enthalpy change and energy change is small

Question 8

Temperature is what during a phase change?

Answer 8

Constant then once material changes, temp increasez

Question 9

When does liquid start or boil

Answer 9

100 degress

Question 10

What is fusion and sublimation

Answer 10

Fusion: solid melts
Sublimation: solid to gas

Question 11

What is heat capacity (C)

Answer 11

Amount of heat needed to raise temp of a given amount of matter by 1 degree
Units: J/C* or J/K
Extensive: amount counts