Transcript Energy - Welcome to ChemConnections

Energy & Crystals
Dr. Ron Rusay
2002
© Copyright 2002 R.J. Rusay
Energy
 Can
be defined as the capacity
to do work, i.e. moving an object
by applying force to mass over a
distance
 Chemical energy is defined as
heat.
 Name five other types of Energy.
Two Types of Energy

Potential: due to an object’s position
or material’s composition - which can be
converted to work

Kinetic: due to motion of an object
= 1/2 mv2
 (m = mass, v = velocity)
 KE
Record Gasoline Production Likely
Throughout 2002
Sources: History: EIA; Projections: Short-Term Energy Outlook, March 2002.
Law of Conservation
of Energy

Different forms of energy can be
inter-converted but can neither be
created nor destroyed.
 (Euniverse
 Describe
is constant)
three inter-conversions of
energy.
First of Three Laws of
Thermodynamics

First Law of Thermodynamics:
The energy of the universe is
constant or “energy is conserved”.
What is a greenhouse gas?
The sun’s energy & the molecule’s shape decide.
•Our atmosphere (air) is 78% nitrogen and 21% oxygen.
•Neither are greenhouse gases. They do not absorb infrared radiation (heat).
•However, H2O and CO2 can absorb infrared energy. Without them earth would
be very chilly.
http://zebu.uoregon.edu/1998/es202/l13.html
What do the sun’s energy, a molecule’s shape and a
TV remote have to do with greenhouse gases?
QuickTime™ and a
GIF decompressor
are needed to see this picture.
http://chemistry.beloit.edu/Stars/EMSpectrum/index.html