Скислородом может реагировать 1) медь 2) оксид углерода(iv) 3) гидроксид натрия 4) серная кислота

1) С кислородом в зависимости от температуры взаимодействия медь образует два оксида:
при 400–500°С образуется оксид двухвалентной меди:
2Cu + O2 = 2CuO;
при температуре выше 1000°С получается оксид меди (I):
4Cu + O2 = 2Cu2О
2)углерод стоит в максимальной степени окисления и поэтому он не сможет быть далее окислен
3)аналогично 4му
4)с серной кислотой кислород в реакцию не вступает

The Moscow Kremlin.
The Moscow Kremlin is one of the most famous landmarks of Russia and the symbol of former Soviet authority. It is a long red brick wall with 20 towers, which were built at the end of the 15th century on the order of Ivan the Great. The most renowned and important tower is the Spasskaya Tower, which leads to Red Square. The tower was put up in 1491 by an Italian architect Pietro Solario. It has a belfry, a ruby star and the chimes, which are broadcast by radio as a time signal to the whole nation. Other famous towers are the Nikolskaya, Troitskaya, Kutafya and Borovitskaya. The name Kremlin means “fortress”. This historic fortified complex is situated at the heart of Moscow and overlooks the Moskva River and Red Square. It is the best known kremlin of Russia. Apart from the walls and towers it includes five strikingly beautiful palaces and four cathedrals. All of them are open to public. The heart of the Kremlin is the Cathedral Square with the main church of Moscow – the Cathedral of Dormition, where all the tsars were once crowned. The church has a massive limestone facade and five golden domes. Other notable structures include two domestic churches and the Bell Tower of Ivan the Great. The largest bell in the world is also situated here. It’s called the Tsar Bell. The oldest structure within the Kremlin walls is the Palace of Facets, which holds the imperial thrones. The other old building is the house of the royal family – the Terem Palace. Both these palaces are linked by the Grand Kremlin Palace. There are also several interesting museums inside the Kremlin walls. For example, the Arsenal, which was originally built for Peter the Great, and the Armoury building, which houses Russian state regalia and Diamond fund. At the moment, the complex of Kremlin serves as the official residence of the President of the Russian Federation.

In society we face a number of problems. We face many different problems from ocean to ocean, but the problem that causes the most problems these days are drugs. With drugs come many different problems. Drugs cause bad decision making, committing crime, and gets people very addicted to bad habits. 
Drugs in the present day are causing people to make bad choices and bad decisions. Drugs aren’t necessarily making people do things that aren’t right, but make it so that people don’t think straight. When people don’t think straight they tend to make wrong choices. When people make wrong choices it usually puts people around them in danger, which isn’t good to have citizens endanger ever.
People go simply crazy is awful and sometimes drugs are the reason for going crazy. If you have ever seen the show Cops or anything like that most of the shows are filled with people going crazy and committing crimes. That leads into my next subject, committing crime because drugs. A lot of crimes like robbing, GTA, murder, Suicide, Homicide, DUI, etc., all are horrible things people do while on drugs. If the world was to crack down on drugs there would be a lot less crime and murders. Less crime and so on the world would be a way better place.
Bad habits are the worst thing about drugs. Common bad habits of drugs are skipping school, skipping work, and not paying bills, are just a few common habits caused by drugs. First off skipping school will get you no where, because when you skip a lot school you will get kicked out. Once you’re kicked out you have a slim chance of getting to college. Once college is ruled out then you have a very shy chance of getting a good paying job. Second off skipping work is just going to get you fired and that will look bad on your record if you ever go to get another job. Also then you wouldn’t be able to afford rent, insurance, bills, groceries, the drug itself, and whatever has to be paid. Once that happens you would lose everything that you were paying and paying off. 
Imagine a world where there are no drugs what so ever. We wouldn’t have to fear as much about crime. No more worrying about what you chose to try because it wouldn’t drugs in it. No more worries about what kids are doing when parents don’t know where they are. The world would be a better place less crime, less bad decision making, less addicted people, and less whackos in our society. Our world would be drug free!