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Bonding within metals due to the electrical attraction of positively charges metal ions for mobile electrons that belong to the crystal as a whole.

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Intermolecular Forces

Forces between individual particles (atoms, molecules, ions) of a substance.

Collision Theory

Theory of reaction rates that states that effective collisions between reactant molecules must occur in order for the reaction to occur.

How to make crystal glass

From history we know that the idea of creating crystal belongs to the British: they were the first to add lead oxides to the charge material, and as a result got glass with unusual “voice”, transparency and sparkling faces. Classical crystal contains 24% of lead oxide, but there are products with a higher content of up to 30%.

Critical Mass

The minimum mass of a particular fissionable nuclide in a given volume required to sustain a nuclear chain reaction.

Nuclear Fission

The process in which a heavy nucleus splits into nuclei of intermediate masses and one or more protons are emitted.

Saccharide

An organic compound containing a sugar or sugars.

Differential Thermometer

A thermometer used for accurate measurement of very small changes in temperature.

Denaturation

A process pertaining to a change in structure of a protein form regular to irregular arrangement of the polypeptide chains.

Atomic Weight

Weighted average of the masses of the constituent isotopes of an element, The relative masses of atoms of different elements.

Standard Entropy

The absolute entropy of a substance in its standard state at 298 K.