Предмет: Химия, автор: ArtemD98

Химия. Неметаллы, нужна помощь
А1. Формула гидроксида элемента IV группы главной подгруппы
1) H2ЭО2 3) Н2ЭО4
2) Н3ЭО3 4) НЭО2

А2. Распределение электронов в атоме, степень окисления которого в водородном соединении равна -1,
1) 2ē, 8ē, 1ē3) 2ē, 8ē, 6ē
2) 2ē, 8ē, 2ē4) 2ē, 8ē, 7ē

А3. Вещество с ковалентной неполярной связью
1) аммиак2) хлор3) вода4) сернистый газ

Ответы

Автор ответа: gerasimenkovanessa

Ответ:А1=3

А2=2

А3=4

Объяснение:

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: Аноним

пересказ текста с английского на английский

1 Nearly 70 years ago, a Soviet geochemist made a surprising observation: through technology and great human numbers, he wrote, people were becoming a geological force, shaping the planets future just as rivers and earthquakes had shaped its past. Eventually, the scientist, Vladimir Vernadsky, wrote that global society guided by science, would soften the human environmental impact, and the Earth would become a "noosphere" — a planet of the mind, "life's domain ruled by reason".
2 Today, a broad range of scientists say the part of Vernadsky s thinking has already been proved correct: people have significantly altered the atmosphere and are the dominant influence on ecosystems and natural selection. The question now is whether the rest of his vision will come true.
3 Humans have realised the environmental damage of the last century. With the aid of satellites and supercomputers, they now have a real chance to balance economic development with the environment beginning with sustaining the Earths ecological systems.
4 "We've come through a period of finally understanding the nature and effect of humanity's transformation of the Earth," said William Clark, a biologist at Harvard University. "Having realised it, can we become clever enough to be able to maintain the rates of progress?" he asked. "I think we can.
5 Some scientists say people can't understand the living planet well enough to know how to manage it. But this problem attracts world leaders and thousands of other participants to summits where they discuss ways of sustainable development. Communities and countries face choices that are likely to determine the quality of human life and the environment well into the 22nd century.

6 Human activity has such a great influence on the planet's ecology that it is no longer possible to separate people from nature. Emissions of carbon dioxide, whether from an Ohio power plant or a Bangkok taxicab, contribute to global warming. Shoppers in Tokyo seeking inexpensive picture frames send people deep into Indonesian forests.

7 Experts conclude that the same inventiveness that accelerated human development can be used to soften human impact.

1 год назад

Предмет: Английский язык, автор: klimykkk

ПЕРЕВЕДИТЕ НОРМАЛЬНО ПОЖАЛУЙСТА )Sweden's Roland Tiensuu, 12, thinks that saving our planet is too important to be left to grown-ups
. Three years ago, the boy learned
from his teacher, Eha Kern (who shares the prize of $60,000 with
Tiensuu), that large areas of rainforests in Latin America had been
destroyed. Tiensuu was worried that by the time he and his class-
mates grew up, there would be no rainforests left to save. "I thought,
there must be something we can do," he says. "I saw a television pro-
gramme where people planted trees to replace some of those that had
been cut down. But of course, we couldn't do that because we lived far
away in Sweden. Then I thought that instead we could buy the rainforest."

With the teacher's help Tiensuu and the rest of the class organized a bake sale in their small village of Fagervik and raised enough
money to buy four hectares of rainforest in Costa Rica. Their school
campaign started the Children's Rainforest, a nonprofit organization whose young members in several thousand Swedish schools have bought 7,000 hectares of jungle with the $1.5

million they have raised so far. Schoolchildren in Germany, Japan and the USA have followed their example. The people of Costa Rica
have named part of the rainforest the Bosque Eterno de los Ninos, or The Children's Eternal Forest.

1 год назад

Предмет: Другие предметы, автор: настенькапростосупер

приведите примеры веществ которые имеют несколько сходных свойств, но хотя бы 1 разное свойство (назвать примеры и свойства все сразу)

1 год назад

Предмет: Алгебра, автор: Nan98

Найти площадь фигуры, ограниченной линиями:
y=x^2+1; x+1=0; x-3=0; y=0.

8 лет назад

Предмет: Биология, автор: Mustafaeva11

Сделайте пожалуйста это очень нужно

8 лет назад