5 résultats pour "alkali"

• ALCALI, ALKALI, substantif masculin.

• Définition du mot: ALCALI, ALKALI, substantif masculin.

  GEORGES-CHARLES, DIT JORIS-KARL HUYSMANS, Marthe, histoire d'une fille, 1876, page 22. Remarque?: 1. Autrefois on distinguait plus pr?cis?ment?: les alcalis caustiques ? Soude, potasse ? (confer CLAUDE BERNARD, Principes de m?decine exp?rimentale, 1878, page 424); les alcalis doux ? Leur carbonate ?; les alcalis fixes ? (Soude, potasse) par opposition ? l'alcali volatil, l'ammoniaque ? (Voyage de La P?rouse autour du monde, tome 4, 1797, page 3). 2. Autres syntagmes. L'alcali animal ? L'ammoni...

• Hydrogen - chemistry.

  Hydrogen gas does not usually react with other chemicals at room temperature. That is, it does not split into two hydrogen atoms to combine with other chemicals. Thebond between the hydrogen atoms is very strong and can only be broken with a large amount of energy. However, when heated with a flame or a spark, hydrogen gaswill react violently with oxygen in the air to produce water in the following reaction: 2H2 + O 2 → 2H 2O This chemical equation shows that two hydrogen molecules (H 2) and o...

• Inorganic Chemistry - chemistry.

  two electrically charged plates (positively charged top plate and negatively charged bottom plate). By measuring the difference in how fast these electron-laden oildrops fell when the metal plates were charged and uncharged, Millikan was able to calculate the total charge on each oil drop. Because each measurement was a wholenumber multiple of -1.60 × 10 -19 coulombs, Millikan concluded this was the charge carried by a single electron. Using Thomson’s electron charge-to-mass ratio, Millikan then...

• History of Chemistry - chemistry.

  even better distillation apparatus than the Arabs had made and to condense the more volatile products of distillation. Among the important products obtained in thisway were alcohol and the mineral acids: nitric, aqua regia (a mixture of nitric and hydrochloric), sulfuric, and hydrochloric. Many new reactions could be carried outusing these powerful reagents. Word of the Chinese discovery of nitrates and the manufacture of gunpowder also came to the West through the Arabs. The Chinese atfirst use...