Предмет: Другие предметы, автор: Zikq

Что такое щелочь.По естествознанию

Ответы

Автор ответа: pyliavskyifly

Щелочь - гидроксид (с приставкой OH в конце) щелочного и других металлов.

Гидроксид - происходит от "гидро", что значит вода и "оксид" (продукт реакции окисления)

Примеры: Сода (NaHCO3), едкий натрий (NaOH), едкий калий (KOH) и т. д.

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Прочесть текст и дать ответ на 3 вопроса.
The Man and the Snake

The reptile was of a species with which Brayton was unfamiliar. Its length he could only guess; the body at the largest visible part seemed about as thick as his arm. In what way was it dangerous if any? Was it venomous? Was it a constrictor? His knowledge of serpents did not enable him to say.

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Brayton lifted his right foot to stop backwards. His hand upon the chair was grasping it. “Nonsense!” he said aloud. “I am not so great a coward as to be afraid.” He lifted his foot a little higher and put it sharply to the floor – one inch in front of the other.

He heard somewhere the continuous throbbing of a big drum with sounds of far music, sweet and beautiful, like the tones of an Aeolian harp. The music stopped; rather it became the distant roll of a retreating thunderstorm. A landscape, shining with sun and rain, lay before him, and in the middle of it a huge serpent, wearing a crown, was putting its head out of its large coils and looking at him with the eyes of his dead mother. Suddenly this enchanting landscape seemed to rise upward, like the drop scene at a theatre, and vanished. Something struck him upon the face. He had fallen to the floor; blood ran from his broken nose and lips. In a few moments he had recovered, and then realized that this fall, by interrupting his gaze, had broken the spell that held him. He felt that now if

he did not look at the snake he would be able to retreat. But the thought of the serpent within a few feet of his head, yet unseen, perhaps in the very act of springing upon him and throwing its coils about his throat was too horrible! He lifted his head, stared again into those sinister eyes, and was again in their slavery.

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***

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a) He saw his dead mother
b) He saw a huge crow
c) He saw an extremely large snake
b) He saw an enormous crown
2. What had that all broken?
a) Nose
b) Spell
c) Lips
d) Imagination
3. All of the following is true, except ...
а) Brayton was almost hypnotised
b) Brayton was under a spell
c) Brayton was affected by magic
d) Brayton was under the curse

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