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At constant temperature the volume occupied by a definite mass of a gas is inversely proportional to the applied pressure.

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Lanthanides

Elements 58 to 71 (after lanthanum).

Valence Shell Electron Pair Repulsion Theory

Assumes that electron pairs are arranged around the central element of a molecule or polyatomic ion so that there is maximum separation (and minimum repulsion) among regions of high electron density.

 

Formula Unit

The smallest repeating unit of a substance. The molecule for nonionic substances

Hydration

Reaction of a substance with water.

Bubbles

Have you ever noticed that soap bubbles go up in winter and fall down in summer? The reason is that warm air is lighter than cold. And in winter the difference between the air temperature in the room (especially near the windows) and the one you exhale into the bubble is enough to overcome the heaviness of its shell.

Three ways to make patina at home

The first way is ammonia patination. To do this, take a plastic container. Put a couple of paper or ordinary towels at the bottom. Moisten them with ammonia. Then sprinkle with large table salt.

yttria

Y2O3: A white, water-insoluble powder, Y2O3, used chiefly in incandescent gas and acetylene mantles.

Nodal Plane

A region in which the probability of finding an electron is zero.

 

Outer Orbital Complex

Valence bond designation for a complex in which the metal ion utilizes d orbitals in the outermost (occupied) shell in hybridization.

Cohesive Forces

All the forces of attraction among particles of a liquid.