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A device used to measure the heat transfer between system and surroundings at constant volume.

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Alkynes

Unsaturated hydrocarbons that contain one or more carbon-carbon triple bonds.

Solvation

The process by which solvent molecules surround and interact with solute ions or molecules.

xenon hexafluoride

A colorless, crystalline compound, XeF6, that melts at 50°C to a yellow liquid, and boils at 75°C.

Ideal Gas

A hypothetical gas that obeys exactly all postulates of the kinetic-molecular theory.

 

Periodicity

Regular periodic variations of properties of elements with atomic number (and position in the periodic table).

Amine

Derivatives of ammonia in which one or more hydrogen atoms have been replaced by organic groups.

Cohesive Forces

All the forces of attraction among particles of a liquid.

Dissociation Constant

Equilibrium constant that applies to the dissociation of a comples ion into a simple ion and coordinating species (ligands).

Sigma Orbital

Molecular orbital resulting from head-on overlap of two atomic orbitals.

Features of the Scanning Tunneling Microscope

The scanning tunneling microscope (STM) invented by Heinrich Rohrer and Gerd Binnig in the 1980s still manages to do a great job today and competes with more advanced microscope types.

The scanning tunneling microscope is used for studying the surface atoms that are found on various materials. The device is based on a complex process of "tunneling" electrons between the material and the tip of a probe.