К 500 мл 32%-ной (по массе) HNO3 (р=1,20 г/мл) прибавили 1 л воды. чему равна массовая доля HNO3 в полученном растворе?

найдите число молекул содержащихся в 2,8 м3 кислорода?

Задание 2. Прочитайте текст. Определите, какие из приведенных утверждений А7-А14 соответствуют содержанию текста (1- true) какие не соответствуют(2-False)и о чем в тексте не сказано (3- Not stated)

Sea Life Sydney Aquarium

Sea Life Sydney Aquarium is located in Darling Harbour which is in the central part of Sydney and thousands of people visit it every year. It was opened in 1988 and since then has been upgraded several times – new sections with new inhabitants have been added, the old pools have been redesigned and new equipment has been installed. Now it’s one of the best equipped, the richest and the largest aquariums in the world – it

contains six million litres of water! Sydney Aquarium is one of the top attractions in Sydney but not only that. It also provides experimental and research opportunities for zoologists and marine biologists of Australia and participates in different international programmes.

Currently, Sydney Aquarium exhibits about 13,000 fish and animals of 700 different species. To make the excursion to the underwater world more informative, the aquarium is designed as 14 themed areas, each focused on a specific eco-community or on specific animals. The names of the areas usually give a good idea of what the tourist can expect to see there. The Tropical Bay of Rays, for example, exhibits a breathtaking

collection of Australian rays2 – very large flat fish, whose graceful movements make them look like huge butterflies flying in the depths of the ocean. In the wild some species of rays can grow to seven metres and weigh more than 1300 kg.

Few people know that rays are close relatives of sharks. Anatomically, they are very similar and one of the exhibits in the aquarium, the White-spotted Guitarfish, is a good proof of that – this fish is a link between rays and sharks and it looks like both of them.

To watch sharks, tourists go to the Shark Valley area. Actually, the aquarium can boast the largest collection of them in the world. Walking through the glass underwater tunnels the visitors come face-to-face with Grey Nurse, Bamboo, Lemon, and Reef sharks – some of them are more than three metres long. Visitors can also witness how these huge and dangerous creatures are hand-fed by the fearless sea-life keepers.

Sydney Aquarium is one of only two places in the world where sharks are not only kept but bred too (the other one is Manly Sea Life Sanctuary)! Sadly, some species of sharks have been hunted to near extinction. To prevent the complete disappearance of the breathtaking creatures, Sydney Aquarium actively participates in conservation programmes, that is, they do a lot to protect and increase the population of endangered

marine animals. Tourists are amazed to see a real shark nursery there! Shark eggs are kept in special containers and the lucky visitors can watch when the young sharks appear from the eggs. Sometime after, the small fish go to another section to grow.

When the sharks are large enough, they are let out in the ocean. One of the most famous and the cutest inhabitants of Sydney Aquarium is the Little Penguin. It’s the smallest species of penguins and the most joyful one. In the wild they enjoy playing and riding the waves, that’s why the aquarium has special equipment to

generate waves in their pool. The penguins seem to feel quite happy with their life in the aquarium and their population there is rising. Every year, so many new chicks are born that some are sent to other zoos and aquariums around Australia. Little penguins choose a partner for breeding and parenting and always stay with the same penguin. In the wild, they raise their chicks on the land. The little penguins seem to have a remarkable memory: when they leave a beach for the first time as chicks, they somehow take a

visual imprint of it - a kind of photo in their mind. As the years go by, they always return to exactly the same beach to breed, even though they might not have been back for a long time.

А. Sydney Aquarium has NEVER changed since the day it was founded.

1)True 2)False 3)Not stated

B. Sydney Aquarium was founded by a professional zoologist.

1)True 2)False 3)Not stated

C. Sharks and rays have much in common.

1)True 2)False 3)Not stated

D. In Sydney Aquarium the sharks are fed once a day.

1)True 2)False 3)Not stated

E. The main aim of conservation programs is to adapt wild animals to life in the

zoos and aquariums.

1)True 2)False 3)Not stated

F. Sydney Aquarium visitors are allowed to see how the sharks are born.

1)True 2)False 3)Not stated

G. The number of little penguins in Sydney Aquarium has fallen recently.

1)True 2)False 3)Not stated

H. In a natural environment little penguins can recognize their birthplace years

later.

1)True 2)False 3)Not stated

текст на тему: "Как я провела лето на море"