Напишите уравнения электрической диссоциации следующих веществ по первой ступени a) h2s; б) mg(oh)2; в) h2so3

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Характерною особливістю етнічної історії України є формування багатоетнічного складу її населення. Воно на всіх етапах історичного розвитку вбирало іншоетнічні субстрати, однак механізм цього процесу у різні часові періоди був різним. Можна виділити три основних етапи формування національного складу. Перший із них, що стосується періоду існування археологічних культур, відтворює процес етнокультурної взаємодії, нерідко об'єднуючи полярні культури, скажімо, землеробську, скотарську, культуру осілих і культуру кочових племен.