HS-PS3 Energy

Amount and rate of heat transfer using iron spheres and liquid nitrogen

Dean Campbell | Tue, 06/04/2024 - 11:00

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When iron spheres at room temperature are added to liquid nitrogen, the nitrogen boils as heat is transferred in from the iron. The amount of liquid nitrogen boiled depends on the amount of heat transferred, which depends on the mass of the iron added. However, the rate at which liquid nitrogen boils depends on the surface area of the iron in contact with the liquid nitrogen. These phenomena can be studied with experiments which measure the mass lost by the boiling liquid nitrogen.

Generating explosive gases from sand

Tom Kuntzleman | Fri, 01/07/2022 - 12:16

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Did you know that sand can be converted into a mixture of gases that spontaneously ignites in air? The procedures involved are relatively simple to perform, spectacular to observe, and relate to a rich assortment of chemical principles.

Hot Topic for Early Spring: Thermogenesis of Eastern Skunk Cabbage

Dean Campbell | Sat, 03/06/2021 - 22:07

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The blossoms of eastern skunk cabbage produce heat for a couple of weeks in early spring. This heat, which can be detected using an infrared camera, results from oxidation of carbohydrates. The mechanisms behind this process can be used to introduce energy transduction during classroom discussions of thermochemistry.

Thermochemical Analysis of the Devil's Milkshake

Tom Kuntzleman | Wed, 10/28/2020 - 14:14

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Learn how to thermochemically analyze the Devil's Milkshake chemical demonstration - just in time for Halloween!

Heat, The Ocean, and Climate Change

Tom Kuntzleman | Fri, 10/16/2020 - 10:14

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Learn a simple way to relate the heat equation (Q = mc∆T ) to climate change.

Seeing Chemistry in a Different Light—FLIR Thermal Cameras in the Classroom

Ben Meacham | Wed, 01/15/2020 - 10:43

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Before trying to use a piece of equipment, it’s worthwhile to have a basic understanding of how it works. To put it simply, FLIR cameras primarily deal with the infrared part of the EMR spectrum. The camera detects infrared energy and converts it into an electrical signal, which is then processed to produce a thermal image on a video monitor.