Home > Chemistry > Chemistry 1A Part Deux: Lecture 21 Notes

Chemistry 1A Part Deux: Lecture 21 Notes

Overview

LOL!  Looks like the teacher in this class has never had a lab coat on.  You can always tell who works in the lab by how dirty and smelly it is.  The first 12 minutes of the class is lab junk that has nothing to do with the actual class.

This is a 49 minute class on energy.  I’ve begun to notice how demonstrations are a big thing at these famous universities.

Details

How does Febreeze work?  Cyclodextrins are rings of sugar molecules.  The inside of the molecule is nonpolar, the odors are typically polar.  Can the molecule be modified to be polar on the inside to strengthen binding?

They are doing an experiment in lab.  Here’s the website:

http://lib.berkeley.edu/CHEM/chem1a/

Here is the Chemistry and Chemical Engineering Library at UC Berkeley:

http://lib.berkeley.edu/CHEM/

Energy is the currency exchanged in the making and breaking of bonds.  Chemistry is about matter, change, energy and light.

She gives a little speech on the “global community” which is a code word for white countries giving time, money and ability to the non-white world.  She’s a goddamn multiculturalism.  Just goes to show you can master one area and be a beginner in another.

Chemical change is associated with energy exchange.

2H2 + O2 = 2H2O powers the space shuttle.

Words: system, surroundings, state, energy, stability.

Potential Energy = U = mgh

The dropped glass of water has lower energy than the water glass at height.  The PE turned into KE into heat and the breaking of bonds.

WHen shooting a gun, energy in to accelerate the bullet, energy out to decelerate it.

Energy is released to produce a more stable state.  Low energy is more stable.

Atoms have KE from translations, rotation, and vibrations.  Potential energy from bonds and intermolecular attractions/repulsions.  Total energy is the sum of KE and PE.

To end it, she pulls out the old potential energy/distance graph.  Bring two atoms close to one another.  They will be attractive for a spell, then at close enough, there will be repulsion.

Breaking bonds takes energy, making bonds releases energy.

Review

PV = nRT

OIL RIG

LEO goes GER

Tissue: epithelial, connective, muscular, nervous

Types of bone: flat, long, short, irregular

IGL: point source, random motion, elastic collisions, high temperatures, low pressure

G = H – TS

K = products/reactants

aA + bB = cC + dD

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