Chapter 10
Energy
- the ability to do work
- produce heat
Potential
- elastic
- gravitational
- chemical *(stored in bonds)
Kinetic
- energy of motion
KE=1/2mv^2
Work
work=force x distance
work=F x d
* if it is not moving its not work
Temp
- energy Formulas
- K 273.15+°C=K
- °C F= 1.8°C +32
Exothermic
release energy
Endothermic
gaining energy
Thermodynamic
-thermodynamic- energy of the universe is constant
- 1st law of thermodynamic- energy of the universe is constant
Internal Energy
ΔE=q+w
q=heat
w=work
Energy Units
J=Joules
cal=Calories
1cal=4.184J
1Cal=1000cal
Formulas
q=mcΔT or q=mc(TF -TI)
q= heat
m=mass
c= Specific Heat Capacity
T= Temp
Units:
q=J
m=g
c=J/g°C
T=°C or K
Enthalpy ΔH
Flow of Energy
Exothermic: -ΔH Endothermic: +ΔH
How to Calculate
Videos
Activities
https://www.usjbruins.org/about/web-sites/mullins/Hess'%20Law%20Extra%20Practice%20Problems.htm
http://www.chemteam.info/Thermochem/HessLawIntro1a.html
References