September 2018 1 23 Report

1.

przeprowadzono reakcję utleniania-redukcji 48g magnezu z parą wodną. w wyniku tej reakcji chemicznej powstało 80g tlenku magnezu i 4g wodoru. oblicz ile gramów pary wodnej wzięło udzial w reakcji chemicznej.

2.

w reakcji chloru z sodem powstało 117g chlorku sodu. oblicz ile gramów sodu i gramów chloru wzięło udział w tej reakcji chemicznej, jeśli chlor stanowi 60,68% masy substratów.

3.

w wyniku reakcji magnezu z tlenem powstało 8g tlenku magnezu. oblicz masę tlenu i magnezu, jeśli masa tlenu wynosiła 2/3 masy magnezu w tej reakcji chemicznej.

albo jakby komuś to pomogło,

zad. 3, 4, 5 ze str 135 w podręczniku Chemia nowej ery do klasy pierwszej gimnazjum.


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I. Put one correct word in each gap.1. We were planning to go on a trip together but my friends have changed mind. now, i don't know ............. to give it up or to go by myself.2. Ralph can be boring at times but on the ...... he is a nice young man.3. Have you heard that Mary Chester got married .......... a Frenchman?4. Robert has had that scar on his cheek ......... he fell off a bike at the age of six.5. I think we'd better take our raincoats. It looks ........... rain.6. It is very kind .......... you to lend us the money. We'll give it back soon.7. When we bought the house it was just a ruin. Then we ........ it renovated by a proffesional building company.8. don't come close to the dog. you knever know ....... dangerous it can be.9. Right after the sccident, the young driver was operated ........ and now the doctors say he's getting better.10. at first, Mike promised to help me with the cleaning but he didn't come at all. he really ........... me down this time.11. Francais was adopted and ......... up by an English family at the age of 6.12. 'I really enjoy the taste of your mushroom soup.' '....... yourself to some more, then. '13. Don't help David with the puzzle. ...... him do it by himself.14 I'm not sure .... it was George that i saw in the pub last night.15. We expect you to ..... your best at the exam. Don't let us down.16. ......... first, nobody likes the idea of visiting the museum but in the end we all enjoyed it.17. Could you please buy me a ....... of bread at the baker's?18. .......... is not much to do on a rainy day like this. one can only read books at home.19. Jerome is a friendof ........... . I met him at a disco last month.20. We don't eat ....... often. We only go to restaurants once or twice a month.II. Write in the correct words.1. You don't have to pay for the meal. It's free of _ _ _ _ g _.2. Car fumes cause incredible air _ _ l _ _ t _ _ _.3. Susan Blackley teaches at university. she's got a pforessor _ _ g _ _ _ in economics.4. One person died and several other passengers were _ n _ _ _ _ d in the bus collision that too place near Coventry yesterday. They are all in hospital now.
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