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A compound formed by interaction of sucrose with a metallic oxide, usually lime, and useful in the purification of sugar.

 

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Film badge

A small patch of photographic film worn on clothing to detect and measure accumulated incident ionizing radiation.

Endothermicity

The absorption of heat by a system as the process occurs.

Tetrahedral

A term used to describe molecules and polyatomic ions that have one atom in center and four atoms at the corners of a tetrahedron.

Joule

A unit of energy in the SI system. One joule is 1 kg. m2/s2 which is also 0.2390 calorie.

Molar Solubility

Number of moles of a solute that dissolve to produce a litre of saturated solution.

Fast Neutron

A neutron ejected at high kinetic energy in a nuclear reaction.

Lone Pair

Pair of electrons residing on one atom and not shared by other atoms, unshared pair.

Lanthanides

Elements 58 to 71 (after lanthanum).

Nitrogenases

A class of enzymes found in bacteria within root nodules in some plants, which catalyze reactions by which N2 molecules from the air are converted to ammonia.

 

Formula Unit

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

Fractional Precipitation

Removal of some ions from solution by precipitation while leaving other ions with similar properties in solution.

Weak Electrolyte

A substance that conducts electricity poorly in a dilute aqueous solution.

xylidine

Any of six isomeric compounds that have the formula C8H11N, are derivatives of xylene, and resemble aniline: used in dye manufacture.

Electrophile

Positively charged or electron-deficient.

DP number

The degree of polymerization, the average number of monomer units per polymer unit.

Curie (Ci)

The basic unit used to describe the intensity of radioactivity in a sample of material. One curie equals 37 billion disintegrations per second or approximately the amount of radioactivty given off by 1 gram of radium.

Intermolecular Forces

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

Graham's Law

The rates of effusion of gases are inversely proportional to the square roots of their molecular weights or densities.

Combination Reaction

Reaction in which two substances (elements or compounds) combine to form one compound.

Ionization Energy

The minimum amount of energy required to remove the most loosely held electron of an isolated gaseous atom or ion.