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A fairly strong dipole-dipole interaction (but still considerably weaker than the covalent or ionic bonds) between molecules containing hydrogen directly bonded to a small, highly electronegative atom, such as N, O, or F.

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Formula Unit

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

Absolute Zero

The zero point on the absolute temperature scale, -273.15°C or 0 K, theoretically, the temperature at which molecular motion ceases. The concept of an absolute zero temperature was first deduced from experiments with gases. When a fixed volume of gas is cooled, its pressure decreases with its temperature. Absolute zero physically possesses quantum mechanical zero-point energy.

Matter

Anything that has mass and occupies space.

Insulator

Poor electric and heat conductor.

Autoionization

An ionization reaction between identical molecules.

Hydrogen-Oxygen Fuel Cell

Fuel cell in which hydrogen is the fuel (reducing agent) and oxygen is the oxidizing agent.

 

Atomic Number


Integral number of protons in the nucleus, defines the identity of element.
 

Gas of rotten eggs

If you happen to break a rotten egg, then you know the smell of hydrogen sulfide, because the stench of the spoiled egg depends on of its presence in rotting protein substances.

Second Law of Thermodynamics

The universe tends toward a state of greater diorder in spontaneous processes.

Distillate

The material in a distillation apparatus that is collected in the receiver.