Showing 1-8 of 8 assets

The Chemistry of Chocolate

Date : 02/12/2011

Clip Length : 00:05:02

This NBC Learn video uses the process of chocolate-making to explain chemical reactions related to heat and temperature, including melting point and the formation of crystalline structures. (Untempered Chocolate photo: Courtesy of Katreece Montgomery)

The Chemistry of Chocolate
The Chemistry of Green: Chlorophyll

Date : 03/16/2011

Clip Length : 00:05:35

This NBC Learn video explains the basic role of the pigment molecule chlorophyll in photosynthesis, and explains why plants are -- or appear to be -- green: because chlorophyll molecules absorb visible light in all color wavelengths except green, which is reflected back, into our eyes.

The Chemistry of Green: Chlorophyll
The Dirt on Ammonia as a Cleaning Agent

Date : 04/15/2011

Clip Length : 00:06:15

This NBC Learn video explains how ammonia works with water to dissolve fatty acids, like stearic acid, in greasy dirt; includes animation illustrating deprotonation, and explaining the Brønsted-Lowry definition of acids and bases.

The Dirt on Ammonia as a Cleaning Agent
The Chemistry of Flowers

Date : 05/06/2011

Clip Length : 00:05:58

This NBC Learn video explains the basic role of pigment molecules -- carotenoids and anthocyanins -- in producing what humans see as color in flowers, as the pigment molecules absorb visible light of various color wavelengths.

The Chemistry of Flowers
Chemistry of Changing Leaves

Date : 10/12/2011

Clip Length : 00:04:22

This NBC Learn video explains the role of the pigment molecule chlorophyll when tree foliage in northern areas changes in autumn from green to shades of yellow, orange and red.

Chemistry of Changing Leaves
Chemistry of Fear and Fright

Date : 10/27/2011

Clip Length : 00:04:58

This NBC Learn video explains what fear is, chemically: a series of responses in the brain and body -- including an increase in heart and respiratory rates, blood pressure, and perspiration -- after release into the bloodstream of two hormones, adrenaline and cortisol, that ready the body for "fight or flight" action.

Chemistry of Fear and Fright
The Chemical Bond Between Cloves and Nutmeg

Date : 01/28/2011

Clip Length : 00:04:07

This NBC Learn video focuses on chemical bonds by profiling eugenol and isoeugenol, two molecules with identical molecular structures except for the placement of one double bond -- a difference that makes eugenol responsible for the flavor and aroma of cloves, and isoeugenol responsible for the taste and smell of nutmeg.

The Chemical Bond Between Cloves and Nutmeg
Chemistry of Ice

Date : 12/22/2011

Clip Length : 00:05:53

This NBC Learn video explains how the molecular structure of H2O changes as it reaches its freezing point, and turns from a liquid to a less dense solid crystal lattice.

Chemistry of Ice

Showing 1-8 of 8 assets

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