Предмет: Химия, автор: Novdan99

Составить уравнение реакции
Этаналь --> Этанол
СH3COH +

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Автор ответа: Бедард
0
                     Ni (кат)

CH₃CHO+H2-------->C2H5OH
 
C2H5OH + CuO ----------> CH3CHO + Cu + H2O
НА!
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Предмет: Английский язык, автор: surogea55
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Trapped on a Desert Island
Kelly opened her sleep-filled eyes and turned her head to see where she was. All she could see was the blue of the ocean meeting the blue of the sky. Hills and trees lined the horizon, but none of them looked familiar. Where was she? A sudden short bark made Kelly leap out of her thoughts. It was a puppy – her puppy, Rex!
Kelly could tell that he was anxious to explore. But explore what? This was unfamiliar ground. She made an effort to focus on her surroundings and soon realised she was on an island. Rex led the way and as soon as he reached a group of trees he sat down in front of them, looking proud. He had led her to an apple tree. Without a second thought, Kelly grabbed an apple and bit into it happily. Twenty minutes later they set off once again.
Kelly looked out at the calm sea and in the distance she could just make out a piece of land.
“Was that home?” she wondered. If it was, how could she get there? She was determined to find a way to escape and building a raft seemed to provide one. Soon Kelly could see her pile of wood taking the shape of a raft. It was only a small one, so if the sea became rough, it would most definitely fall apart. But for now it was floating properly.
Kelly and Rex were ready. They climbed on the raft and Kelly steered them across the ocean with a long piece of wood, which made a perfect oar. Without warning, the sky darkened, the sea went wild and the waves crashed onto the raft. Kelly tried to work out what she should do. She was too far from the island they had left behind and not close enough to the island she called home. She pressed forward, fighting the waves, battling the wind, until an enormous wave hit!
Kelly’s eyes opened. Rex was licking her face. She pushed Rex gently aside and looked around. She knew she was home. Then a voice said: “Where have you been? Everyone’s been looking for you.” Kelly recognised the voice of Pete, her brother. She looked up and there he was. She looked out to sea. Where was the small island she'd been on? Had it all been a dream? Kelly glanced down at her hand. There was living proof. She was still clutching tightly onto that long stick. Turning to Pete she whispered, “I got lost, Pete, lost on a desert island”.

1 How did Kelly feel when she woke up?
A excited
B tired
C puzzled
D homesick

2 Why did Rex stop near the line of trees?
A He was waiting for Kelly.
B He was proud of Kelly’s discovery.
C He had got lost.
D He had found food for his companion.

3 What did Kelly decide to do on the island?
A to cut down some trees
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C to make a raft
D to swim in the calm sea

4 What happened while Kelly and Rex were at sea?
A The weather changed for the worse.
B The raft they were on fell to pieces.
C The calm sea helped them reach dry land.
D The weather improved.

5 What did Kelly realise at the end of the story?
A That it had all been a dream.
B That her brother didn’t believe her story.
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