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THERMODYNAMICS
Heats of Reaction and Hess’s Law—Small-Scale Calorimetry Laboratory Kit
An intense flame, blinding light and searing heat—magnesium burning in air is a dazzling reaction, but how much heat is produced? In this advanced microscale experiment, students use an indirect method and Hess’s Law to determine the heat of reaction for magnesium combustion. Students measure the heats of reaction for magnesium and magnesium oxide reacting with hydrochloric acid, then using Hess’s Law and a little algebra, they combine the measurements with the heat of formation of water to determine the heat of reaction for the overall reaction. Special small-scale calo-
working in pairs.
AP6441 | $54.75
rimeters included with the kit give remarkably accurate results. Complete for 30 students
Thermodynamics in a Bag—
Super Value Kit
Zinc Pyrotechnics—
Introduce the topic of thermo-
dynamics using the hands-on
activities provided in this
kit. Students will experience
exothermic and endothermic
reactions as they perform three
different chemical reactions.
All the reactions are performed
in heavy-duty, zipper-lock plastic
bags. The setup and reactions are
quick, and the bags are reusable, which saves precious laboratory time and money. Students monitor temperature changes by touch or quantitatively by the use of a ther- mometer (not included). Includes chemicals, bags, pipets, Teacher Notes and reproduc- ible student worksheets. Super Value Kit is complete for 5 classes of 24 students work- ing in pairs.
AP4779 | $54.65
Lab Safety Shields
3 options at flinnsci.com
Whoosh Bottle—Demonstration Kit
Use this exciting demonstration to teach combustion reactions, molar relation- ships and thermodynamics. Students love to see the blue alcohol flame shoot out of the bottle and yellow flames pulsate as more air is drawn in. The procedure and safety information makes this popular demonstration safe to perform. A safety shield is recommended.
See free video at flinnsci.com.
Chemical Demonstration Kit
A spectacular “fireworks” display is initiated
by adding two drops of water to a mixture of dry chemicals. Place a beaker with very small amounts of zinc dust, ammonium nitrate and
a catalyst in a fume hood. Add two drops of water to the mixture and watch as sparks, smoke and excitement fill the air. Must be performed on a heat-resistant surface in a fume hood or outdoors.
AP9117 | $24.20
AP5943 | $37.35
THERMODYNAMICS
I FLINN SCIENTIFIC 33
CHEMISTRY