Определите какие реакции являются окислительно-восстановительными: Можете еще коэффиценты расставить . a) CaO+H2O=Ca(OH)2 b)Ca+2H2O=Ca(OH)2+H2 c)H2+I2=2HI d)HI+KOH=KI+H2O e)2KI+Cl2=2KCL+I2 ?

На трёх деревьях сидели 45 скворцов. Когда с первого дерева улетели 5 скворцов, со второго - 7, а на третий прилетели 3, то на всех трёх деревьях стало скворцов поровну. Сколько скворцов сидело первоначально на третьем дереве?

за семь книг и 5 альбомов заплатили 460 рублей. Сколько стоит одна книга и один альбом? Если альбом дороже на 20 рублей

Сколько существует четырёхзначных чисел, делящихся на 5, у которых все цифры разные и чётные?

Paul Lynch has been practising ice climbing for several years now and has climbed many frozen waterfalls. "My parents took me skiing to the Alps when I was a child and ever since, I've been addicted to the __mountains. I moved to

Canada a few years ago

and I fell in love with ice iT'~ climbing. I spend most bgfr 'I of my free time climbing

Basically, ice climbing involves swinging an axe into the ice above your head and pulling yourself up on it. You need a lot of equipment such as a helmet, rope and boots for ice climbing. And of course, it’s very physical, so you really have to be in

good shape," says Paul.

Harry Bolton

didn't really like sport at all until he discovered something both new and unusual "I was listening to the radio one day when I heard something that I thought must have been a joke.

The DJ was talking about underwater hockey! When I

realised it actually was a real sport, I decided to find out more about it. To my surprise, I found a local team and before I knew it, I was part of it!

Unlike water polo, where the action takes place above the water, underwater hockey is played at the bottom of the pool. Players wear masks, flippers and snorkels during the game.

"The rules are really simple, you just have to slide the puck into the opposing team's goal," says Harry.

Underwater hockey was invented by a British diving club in 1954 and was originally called Octopush. Harry told us, "Unfortunately it's not much of a spectator sport, as all people watching from outside the pool can see are lots of splashing and flippers!"

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 Я новичёк ,не знаю что к чему, могу что нибуть дать взамен)