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UCD / Biology / BIOL 2 / What are the key points of thermochemistry?

What are the key points of thermochemistry?

What are the key points of thermochemistry?


School: University of California - Davis
Department: Biology
Course: General Biology
Professor: M. schwartz
Term: Fall 2015
Tags: CHE 2B, General Chemistry, Dr. Ng, UC Davis General Chemistry, and thermochemistry
Cost: 25
Name: CHE 2B Week 1 Lecture Notes
Description: These notes cover the first week of lecture.
Uploaded: 01/05/2016
6 Pages 47 Views 1 Unlocks


What are the key points of thermochemistry?

Lecture 2

Thermochemistry - study of heat from a chemical

os ran w/ surroundings

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system - whatever is being studied- can be big or small surroundings- everything that is not part of the system open system - is able to transfer energy & mass o closed system can only transfer energy isolated system - nothing is transferred

What does the law of conservation of energy state?

If you want to learn more check out How does religion control society?

energy = kinetic &


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capacity to do work (W)



over a


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thermal energy - type of kinetic energy, associated

w/ movement of particles relating

What is the function of bomb calorimeter?

Don't forget about the age old question of How do mutations give rise to new variations?

to temperature

heat (q)- energy associated w/ a difference in

temperature, transferred via collisions *always transferred from hot to cold

qdo T m qamass

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Csp - specific heat capacity - amount of energy

temp of required to raise? Ig of of a substance by loc

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G g = MCAT SI unit for heat= calorie

food a I calorie - 4.185 calorie Ical = 1000 cal = 1 kcal

study Don't forget about the age old question of How do covalent bond and hydrogen differ?

9 = CSAT has no mass dependency Shay

(heat capacity not specific heat capacity)

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chemical energy - associated w/ bonds & movement

of molecoles

qrxn - heat associated w/ a chemical ran occuring We also discuss several other topics like Is childhood disintegrative disorder autism?

@ a constant tennp (isotherm)





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qron means reactants & products at the same temp

are Don't forget about the age old question of What protists are heterotrophic?

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endothermic ron products at tq to Soup


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exothermic ran


products soup

& in general metals have low heat capacities

- if something heats up easily it has a low Don't forget about the age old question of Why is psychology more than just common sense?

specific heat capacity and visa versa


& liquid water has a high specific heat capacity

because of hydrogen bonding (even though it is small)



Ex: Calculate the heat needed to raise sog of

CG HG (benzene) from 25.

30 to 37.2°C. Csp (CC HQ) = 4.053/g°c

& AT IS the same in °C ork


q = mC sp OT = (50 g) (4.053/g°c) (37.2-25.3°c)



of Conservation

of Energy - energy must be conserved

qrxn = -q surroundings (9 system)

qoxn + q sur = 0

*if one thing loses heat, something else will gain it

Bomb calorimeter - apparatus that allows for study

of heat exchange

• can calculate heat capacities te

• must have excess oxygen inside for complete

combustion of the sample

•change in temp of the water is used to determine

the specific heat capacity

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q combustion (com) - heat evolved in a combusion ran

Problem of the day


q= (2379) (4.18 3/9°c)(37-23°c) = 13,869.243) 13,869 5/Ical II Cal -

3.318 Cal 14.185 11000 cal

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1/8/16 Lecture 3


W/ change in tempe use q=mcoT

o Ball





If z>T,, ball loses heat & - Calorimeter gains heat'

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& cal = q cups + 2Hot ... = Ceal + q Hzo

une in cludes everything moon an n o part of calorimeter *cannot have a phase change qrxn = diff in energy between reactants/products

@ same tempo

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•work - force

PV work

acting over a distance = pressure volume work,

Ifi angas > 0, expansion

on gasco, compression




OV for expansion => positive

• work is done by the system




(* 1 l-atm = 101.33)

W3o =) work is done on the


Ex: calculate the quantity of work

3.5L expansion of a gas against

pressure of 748mm Hg. Love

associated w/ a an external



W = -Pext AV => (-748 mm Hg)/latm

1760 mmHg = -3.4 L'atm


-3.4 Lam 101.3.5 = (-3.5 x 10250


EX: A sample gives off 5228 cal when bumed in

a calorimeter, The AT of calorimeter is 4.39°C. What is the heat capacity of the calorimeter?

q sample = -qeal tqtzo if H2o is given -5228 cal = -Cear OT = - Ccal (4.39°c)

Ceal = 5228 cal = 11190.89 cal foc

4.39 °C 1190.89 cal 4.185

oc lical

important & 1st law of thermodynamics.

AU = qtw



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w/ capital =) state function - trait only depends on initial

& final states of system a w/ lower case => path function - overall value depends on.

path it takes - distance traveled (path function)

altitude (state function)

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constant volume: Ov=0

su =q+w a w=-por



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constant pressure

ou = qtw pole = q-par

=> AU + PAV = qe

AH = enthalpy


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