أكاديميا - كولنز - معاجم الجيب العلمية - الكيمياء - انكليزي - فرنسي - عربي الحرف ٦_ a

Academia - Collins - Pocket Scientific Dictionaries - Chemistry
English - French - Arabic - letter 6_A


annealing
recuit m

You give birth. It causes metals to heat and cool
Changes in its properties, especially in its strength. And when
The metal is heated to a high temperature and then cooled very slowly. The metal becomes soft and malleable. This is caused by allowing the crystals in the mineral to become very large. This slow cooling is called annealing.


anode
anode f

elevator. When electrolysis is performed in a solution, an electrode with a positive potential is called an anode. Stalagmites attract anions to the anode because they are negatively charged. Electrolytes give up their excess electrons at the anode. Non-metallic elements are produced and electrons are transmitted through the circuit.
See cathode.


anodizing
traitement m anodique

Sublimation of aluminum with a protective layer of oxide (Al2O3). The thickness of this oxide layer can be increased by making a piece of aluminum an anode (+) in an electrolysis cell. Diluted sulctrolysis acid is used as an electrolyte, and the aluminum atoms give up electrons and react with water:

2AI (solid) + 3H2O (liquid) > 2AIO3 (solid) + 6H (aqueous) +6e

Aluminum oxide is formed that can be dyed and produce attractive coatings for products such as colored milk bottle stoppers.


antifreeze
antigel m

Antifreeze. A substance added to the engine cooling system in winter to avoid the formation of ice, which may damage the engine. The additives lower the freezing point of water.
The two most used materials are:
Methanol CH3-OH
Etan-1,2-diol

aq

water. This abbreviation is used to refer to an aqueous solution, such as: (aqueous) NaCl.


aqueous solution
Solution f aqueuse

Aqueous solution. A solution in which water is the solvent.


argon(Ar)
argon m

Argon. Noble gas is the most abundant gas, it constitutes 0.9 percent of the atmosphere by volume, and is very little reactive. No argon compound has been made yet. Argon is used where a non-reactive gas is useful, such as lamp balls and fluorescent tubes.


aromatic (of compounds)
aromatique

Aromatic (for compounds). Compounds containing a benzene ring structure in their molecules.


arsenic
arsenic m

Arsenic is a brittle gray metalloid and its compounds
Very toxic, especially its oxide (AS203). It is an element of group 7 that exists as allotropes. Arsenic compounds are used as pesticides. Gray heterogeneous sublimes sublimate at a temperature of 613°C


asbestos
asbeste m

Asbestos is a naturally occurring silicate that was widely used in the past in fireproof clothing and as insulating materials. Today, its use is limited to narrow limits due to the dangers of asbestosis, a fatal lung disease. Asbestos was widely used in schools as seat covers and nets, but these are now made from materials that do not contain asbestos.


atmosphere
atmosphère f

Atmosphere. 1 - unit of pressure. Although
The air pressure surrounding us varies from one place to another and from time to time. Its value usually changes only slightly and is always close to one atmospheric unit.
2 - The mixture of gases surrounding our planet or the sun
By the moon. The atmosphere around the Earth is air.