Предмет: Химия, автор: sdasadas

Что означают цифры до и после атома? Например 2H₂

Ответы

Автор ответа: INichegoNePonimat

Ответ:

Цифры до означают какое количество вещества вступило в реакцию

А цифры после показывают количество атомов в молекуле

Автор ответа: N1Melnik

2H₂ - коэффициент. Он обозначает число молекул вещества (в данном случае водорода).

2H₂ - индекс. Он обозначает число атомов в одной молекуле вещества.

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: slashik

410 БАЛЛОВ

Нужно написать небольшое письмо-ответ на английском языке.
Информация в приложении.

2 года назад

Предмет: Английский язык, автор: 2013201415

Нужно вставить слова,слова не даны,но даны первые буквы этих слов.
Easter Island is in the South Pacific Ocean, 3,700 kilometres from Chile. The island was named so by the Dutch explorer Jacob Roggeveen because he saw it on Easter 1) S_______ 1722. People live on the island today but it is difficult to live there as it is so 2) f_____ away from anywhere else. Easter Island is made from three 3) volcan , but they don’t erupt any more. The last time they erupted was over 100,000 years 4)

The island is 5) f________ for its mysterious stone figures. They are known as “Moai”. These statues are between three and twelve metres 6) t_____. Today, there are more 7) t______ 800 statues on the island, but in the 8) p______ there were more. The statues are known for their enormous 9) ______ with large broad noses and strong chins. No one really knows why the statues were made. Archeologists think that they represent dead tribal 10) l_______. Most of the statues are on the coast of the island and stand with their 11) b______ to the sea. Historians think the 12) o_______ statues were made 13) b_______ 1150 and 1500. The monuments were carved out of soft volcanic stone in the quarry and moved on wooden rails for more than twenty-two 14) k________.
It’s incredible that there are almost no trees on Easter Island. The climate is warm and the soil on the island is good for growing things. There is evidence that in the past a 15) f________ covered the island. So what happened to it? Some historians think that the island people cleared away the trees so that they 16) c______ move the statues around the island. We don’t know why the people who built the statues left the island. Perhaps they were killed by disease or war. There are many unanswered 17) q_________ about Easter Island.

2 года назад

Предмет: Русский язык, автор: Saipulaev2002

Составьте два предложения с не обособленными определениями.

2 года назад

Предмет: Математика, автор: ingita77

найдите х, если;а) х+0,8=1 б) х-0,08==0,07; в) 1.2-х=0,4; г) 5,4+х=6:

9 лет назад

Предмет: Математика, автор: ponihidenko2017

частное чисел 31500 и 42 увеличить на произведение чисел 128 и 145

9 лет назад