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The amount of heat required to raise the temperature of a body (of any mass) one degree Celsius.

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Dermal toxicity

Adverse health effects resulting from skin exposure ot a substance.

Contact Process

Industrial process by which sulfur trioxide and sulfuric acid are produced from sulfur dioxide.

Ore

A natural deposit containing a mineral of an element to be extracted.

Dextrorotatory

Refers to an optically active substance that rotates the plane of plane polarized light clockwise, also called dextro.

Equilibrium Constant

A quantity that characterizes the position of equilibrium for a reversible reaction, its magnitude is equal to the mass action expression at equilibrium. K varies with temperature.

Wild patina, is it so bad?

Usually this kind of patina appears on monuments. The most striking example is the Statue of Liberty in New York.

Dissociation

In aqueous solution, the process in which a solid ionic compound separates into its ions.

Pairing Energy

Energy required to pair two electrons in the same orbital.

Thermal Cracking

Decomposition by heating a substance in the presence of a catalyst and in the absence of air.

 

Cathode Ray Tube

Closed glass tube containing a gas under low pressure, with electrodes near the ends and a luminescent screen at the end near the positive electrode, produces cathode rays when high voltage is applied.