solid state chemistry

JCE 94.06 June 2017 Issue Highlights

Mary Saecker | Wed, 06/14/2017 - 19:03

Engaging Participation and Promoting Active Learning

The June 2017 issue of the Journal of Chemical Education is now available online to subscribers. Topics featured in this issue include: materials science and nanotechnology laboratories, promoting active learning, catalysis and kinetics, blue bottle reaction, cost-effective instrumentation, resources for teaching, from the archive: anchoring concept content maps.

Thermochromism: Mercury(II) Iodide - Temperature Increases

Mercury(II) iodide is heated to convert it from its red low-temperature alpha form to its yellow high-temperature beta form.

Thermochromism: Mercury(II) Iodide - Temperature Decreases

When the beta form of mercury(II) iodide cools to below the transition temperature of 126°C, it returns to the red/orange alpha form.

Memory Metal - Demonstration

When memory metal is bent, it deforms. When placed into hot water, the metal "remembers" its original shape.

Memory Metal - Animation

An animation shows how memory metal can be deformed then go back to its original shape.

Hardness of Solid Substances - Peeling Layers of Molybdenum Disulfide - Animation

An animation illustrates how peeling occurs between layers where bonding is weak in molybdenum disulfide.

Hardness of Solid Substances - Grinding Lead

Lead is a relatively soft metal that can be flattened.

Hardness of Solid Substances - Diamond Scratching Glass

A piece of glass is scratched with a diamond-tipped stylus, showing that diamond is harder than glass.

Hardness of Solid Substances - Shattering a Silicon Wafer

A silicon wafer is flexed until the wafer shatters.

Hardness of Solid Substances - Peeling Layers of Molybdenum Disulfide

A piece of tape pressed against a sample of molybdenum sulfide will peel off layers of the sample. Additional tape can be used to cleave the peeled sample hundreds of times.